Showing papers on "Xanthene published in 1997"
TL;DR: Rates of H(*) abstraction by (n)()Bu( 4)NMnO(4) correlate with rates of abstraction by oxygen radicals, which are explained on the basis of its ability to form an 80 +/- 3 kcal/mol bond to H(*).
Abstract: Oxidations of arylalkanes by nBu4NMnO4 have been studied in toluene solvent: toluene, ethylbenzene, diphenylmethane, triphenylmethane, 9,10-dihydroanthracene, xanthene, and fluorene. Toluene is oxidized to benzoic acid and a small amount of benzaldehyde; other substrates give oxygenated and/or dehydrogenated products. The manganese product of all of the reactions is colloidal MnO2. The kinetics of the reactions, monitored by UV/vis spectrometry, show that the initial reactions are first order in the concentrations of both nBu4NMnO4 and substrate. No induction periods are observed. The same rate constants for toluene oxidation are observed in neat toluene and in o-dichlorobenzene solvent, within experimental errors. The presence of O2 increases the rate of nBu4NMnO4 disappearance. The reactions of toluene and dihydroanthracene exhibit primary isotope effects: kC7H8/kC7D8 = 6 (±1) at 45 °C and kC14H12/kC14D12 = 3.0 (±0.6) at 25 °C. The rates of oxidation of substituted toluenes show only small substituent...
177 citations
TL;DR: In this article, a photometric method for acid quantification in nonaqueous media has been developed to facilitate quantification for photoacid generators (PAGs) employed in resist compo...
Abstract: We report here on a new photometric method for acid quantification in nonaqueous media which has been developed to facilitate quantification for photoacid generators (PAGs) employed in resist compo...
147 citations
Patent•
11 Apr 1997TL;DR: The family of dyes of the invention are fluoresceins and rhodols that are directly substituted on one or more aromatic carbons by fluorine as mentioned in this paper, which are useful as detectable tracers and for preparing conjugates of organic and inorganic substances.
Abstract: The family of dyes of the invention are fluoresceins and rhodols that are directly substituted on one or more aromatic carbons by fluorine. These fluorine-substituted fluorescent dyes possess greater photostability and have lower sensitivity to pH changes in the physiological range of 6-8 than do non-fluorinated dyes, exhibit less quenching when conjugated to a substance, and possess additional advantages. The dyes of the invention are useful as detectable tracers and for preparing conjugates of organic and inorganic substances.
82 citations
TL;DR: In this paper, an easy and cheap laboratory method was presented for the direct mono-and diiodination of a number of activated and deactivated arenes, and the main iodination reactions occurred at the temperatures not exceeding 65 °C for 0.5-12 h in the anhydrous, strongly acidic liquid system, I2/AcOH/Ac2O/H2SO4, in the presence of prior dissolved CrO3 used as the oxidant.
Abstract: An easy and cheap laboratory method is presented for the direct mono- and diiodination of a number of activated and deactivated arenes. The main iodination reactions occurred at the temperatures not exceeding 65 °C for 0.5—12 h in the anhydrous, strongly acidic liquid system, I2/AcOH/Ac2O/H2SO4, in the presence of prior dissolved CrO3 used as the oxidant. The yields of the pure iodinated products varied from 31% (for 3,5-diiodobenzoic acid) up to 90% (for 4-iodoanisole). So far, benzonitrile and some oxidizable aromatics, e.g. naphthalene, fluorene, xanthene, and thiophene, have been found to be unsuitable for the effective iodination. Nevertheless, this novel, simple method of direct iodination is worthy to be extended to other appropriate aromatics.
48 citations
TL;DR: In this article, the use of supercritical fluid (SF) carbon dioxide modified by organic solvents and inorganic salts or chelating reagents was investigated for the extraction of the xanthene dyes phloxine B and uranine from soil.
Abstract: The use of supercritical fluid (SF) carbon dioxide (CO2) modified by organic solvents and inorganic salts or chelating reagents was investigated for the extraction of the xanthene dyes phloxine B and uranine from soil. Methanol (MeOH), n-butylamine (n-BA), and a chelating agent, ethylenediaminetetraacetic acid tetrasodium salt (Na4EDTA), were the most effective modifiers of SF CO2 for quantitative recoveries of phloxine B and uranine in soils with 10−20% moisture at 60 °C/476 atm and 60 °C/272 atm, respectively. At these supercritical fluid extraction (SFE) conditions, recoveries of related xanthene dyes (i.e., 2‘,7‘-dichlorofluorescein, 4,5,6,7-tetrachlorofluorescein, eosin Y lactone, erythrosin B, and rose bengal) fortified at 25 μg/g in Hawaiian soils ranged from 65 to 93%. Good separation of a mixture of these dyes was achieved by HPLC. A mixture of MeOH, n-BA, and sodium hexametaphosphate [(NaPO3)6] was effective for conventional solvent extraction of phloxine B and uranine from fortified soils. Howe...
45 citations
TL;DR: An efficient two-step procedure for the synthesis of 2,3,4,9,tetrahydro-1H-xanthene-1,9-dione is described in this paper.
Abstract: An efficient two step procedure for the synthesis of
2,3,4,9-tetrahydro-1H-xanthene-1,9-diones is described. A study
of their conjugate additions has shown them to be efficient Michael
acceptors. Reaction of 2,3,4,9-tetrahydro-1H-xanthene-1,9-dione
with tris(methylthio)methyllithium, followed by mercury(II)
catalysed methanolysis, gave methyl
1-hydroxy-9-oxo-3,4,4a,9-tetrahydro-2H-xanthene-4a-carboxylate,
the nucleus of the secalonic acids and other natural products
36 citations
TL;DR: In this paper, the orientation of Rhodamine 6G in the 22-,~ basal-spaced complex with Li-fluor- taeniolite has been studied using X-ray powder diffraction, 1-dimensional Fourier analysis, polarized infrared (IR) spectroscopy, carbon analysis and thermal analysis.
Abstract: The orientation of rhodamine 6G (R6G) in the 22-,~ basal-spaced complex with Li-fluor- taeniolite has been studied using X-ray powder diffraction, 1-dimensional Fourier analysis, polarized infrared (IR) spectroscopy, carbon analysis and thermal analysis. The R6G was adsorbed by cation ex- change in aqueous solution. In the range of 0.086 to 0.46 molar ratio of R6G to taeniolite, the basal spacings of the complex were nearly constant at 21.7 to 22.2 ,~. From X-ray diffraction (XRD) data, it was confirmed that R6G in the complex orients with its longest xanthene ring axis perpendicular to the ab plane of the host. The pleochroism of IR absorption bands at 1331, 1517, 1537 and 1621 cm -1 supports the vertical orientation. The wide stability range of the vertical configuration is consistent with the strong coulombic force between the highly negatively charged silicate layer of the host (cation exchange capacity (CEC) = 157 _+ 9 meq/100 g) and the positively charged nitrogen bonded to both sides of the R6G xanthene ring.
34 citations
TL;DR: In this article, a new transformation of bisphenol A to polymethylated 9,9-dimethylxanthenes 2−5 in the presence of an exogenous phenol is described.
Abstract: A new transformation of bisphenol A (1) to polymethylated 9,9-dimethylxanthenes 2−5 in the presence of an exogenous phenol is described. The reaction proceeds with concurrent liberation of phenol, is catalyzed by strong acid, and takes place at synthetically useful rates at temperatures above 100 °C. Materials chemically related to bisphenol A, polycarbonate 10, chroman 11, and tars generated during the manufacture of 1, behave similarly. The product xanthenes are useful as precursors to novel xanthene polyesters such as 33 having high glass transition temperatures relative to analogous materials based on 12 or 13. Catalytic oxidation of xanthenes 2−4 affords highly insoluble diacids that are esterified to the esters 6−8. A mechanistic framework accounting for the appearance of chroman 23 and spiroketal 24 as intermediates is given. Overall, the reaction has the characteristics of a complex series of equilibria in which xanthenes such as 2 are strongly favored.
25 citations
TL;DR: In this article, the effect of xanthene dyes on the acoustic cavitation threshold in an aqueous solution was investigated in a progressive wave field, and the ability of these dyes to reduce the threshold for sonochemically active cavitation was strongly correlated with their ability to stabilize foams.
22 citations
TL;DR: The easy synthesis of 9-hydroxy-9-(4-carboxyphenyl)xanthene 1 linker for the solid phase peptide synthesis of peptide amides is reported in this article.
18 citations
Patent•
26 Apr 1997
TL;DR: A compound of Formula (1) is a colorant for toners, D2T2 printing, plastics, polyesters, nylons and inks, especially inkjet or hot melt inks as discussed by the authors.
Abstract: A compound of Formula (1): wherein: X 1 is an ester group or an amide group (eg of a carboxylic or sulphonic acid) or a fatty amine salt of a sulphonic acid; each X 2 independently is a substituent; m has a value of from 0 to 2; Y 1 and Y 2 are each independently H, alkyl or halo; each Z independently is an ester or amide group; and A - is an anion. The compound is useful as a colorant for toners, D2T2 printing, plastics, polyesters, nylons and inks, especially inkjet or hot melt inks.
TL;DR: James Robert Heitz, born 1941, is a Prof. of Biochemistry and Molecular Biology, Mississippi State University, Mississippi Mississippi State, MS, and President, PhotoDye International, Inc.
Abstract: James Robert Heitz, born 1941. Prof. of Biochemistry and Molecular Biology, Mississippi State University, Mississippi State, MS. President, PhotoDye International, Inc. A.B. in Chemistry (1963), Bellarmine College; Ph.D. in Biochemistry (1967), U. of Tennessee (Knoxville). 1968-70, Postdoctoral at the McCollum-Pratt Institute, The Johns Hopkins University, 1970-74, Asst. Prof.; 1974-79, Assoc. Prof.; 1979-present, Prof., all at MSU. 1974-present, joint appointment, Dept. of Chemistry; 1975-present, joint appointment, Dept. of Entomology, both at MSU; 1987-89, Manager, Center for Agricultural Product Research and Development; 1988-94, Head, Analytical Support and Food Safety Laboratory, both at MSU. Main field of interest: The effects of dyes in agricultural systems. Fellow, Division of Agrochemicals, American Chemical Society.
Patent•
02 Jul 1997
TL;DR: In this paper, the authors describe drugs containing compounds of xanthene dyes or derivatives thereof (including dimers) and inducing an ultrasonic action of lowering the threshold of acoustic strength causing acoustic cavitation.
Abstract: Drugs containing compounds of xanthene dyes or derivatives thereof (including dimers) having xanthene ring(s) and inducing an ultrasonic action of lowering the threshold of acoustic strength causing acoustic cavitation, wherein any of R1 to R8 bonded to carbon atoms of the xanthene dye skeleton is a functional group capable of chemically binding to a halogeno, thiol or amino group (selected from among halogenated acetamide, maleimide, aziridine, isothiocyanate, succinimide and sulfonyl chloride). Because of being able to lower the threshold, these drugs make it possible to safely treat benign or malignant tumors or stones by the irradiation with ultrasonic waves of a low acoustic strenght.
Patent•
16 Oct 1997TL;DR: In this paper, the authors describe a set of colors of the formula "STR1" in which A 1 and A 2 independently of one another are the radical of a monoazo, polyazo, metal complex azo, anthraquinone, phthalocyanine, formazan, azomethine, dioxazine, phenazine, stilbene, triphenylmethane, xanthene, thioxanthone, nitroaryl, naphthoquinone or perylenetetetracarbimide dye
Abstract: Dyes of the formula ##STR1## in which A 1 and A 2 independently of one another are the radical of a monoazo, polyazo, metal complex azo, anthraquinone, phthalocyanine, formazan, azomethine, dioxazine, phenazine, stilbene, triphenylmethane, xanthene, thioxanthone, nitroaryl, naphthoquinone, pyrenequinone or perylenetetracarbimide dye, R 1 , R 2 , R 3 and R 4 independently of one another are hydrogen or substituted or unsubstituted C 1 -C 4 alkyl, Y 1 and Y 2 independently of one another are halogen, carboxypyridinium, substituted or unsubstituted amino or a heterocyclic radical bonded via a nitrogen atom and n is a number from 1 to 7, are particularly suitable for dyeing or printing fiber materials containing hydroxyl groups or nitrogen. Dyeings with good fastness properties are obtained with a high dyeing yield.
TL;DR: The synthetic methods by which the hydroxyl groups of calix[n]arenes have been formally dehydrated to afford xanthene derivatives, or have been replaced totally or partially by hydrogen, amino, halogen, alkyl, or mercapto groups are reviewed in this article.
Abstract: The synthetic methods by which the hydroxyl groups of calix[n]arenes have been formally dehydrated to afford xanthene derivatives, or have been replaced totally or partially by hydrogen, amino, halogen, alkyl, or mercapto groups are reviewed.
Patent•
04 Jun 1997
TL;DR: Xanthene derivatives of formula (I) as discussed by the authors have been used as anti-neurodegenerative active ingredients for medicaments, where A signifies methylene, carbonyl or thiocarbonyl, and R represents an amino group, either unsubstituted or mono- or di-substitized by monovalent aliphatic and/or araliphatic radicals.
Abstract: Xanthene derivatives of formula (I) wherein A signifies methylene, carbonyl or thiocarbonyl, R represents an amino group, either unsubstituted or mono- or di-substituted by monovalent aliphatic and/or araliphatic radicals, or disubstituted by divalent aliphatic radicals, and R1, R2, R3 and R4, independently of one another, denote hydrogen, lower alkyl, lower alkoxy, halogen or trifluoromethyl, and their pharmaceutically employable salts, may be used as anti-neurodegenerative active ingredients for medicaments. The invention also relates to new compounds of formula (I).
TL;DR: The structural parameters and charge distributions of 9,10-dihydroanthracene (DHA) 1a, xanthenide 1b, N-methylacridane 1c and thioxanthene 1d, and their monoanions 2a-d have been calculated by an ab initio MO method at the Hartree-Fock level using 6-31G(d) basis set.
Abstract: The structural parameters and charge distributions of
9,10-dihydroanthracene (DHA) 1a, xanthene 1b, N-methylacridane
1c and thioxanthene 1d, and their monoanions 2a–d have been
calculated by an ab initio MO method at the Hartree–Fock
SCF level using 6-31G(d) basis set. The calculated dihedral angles
(α) indicate that xanthene
(α = 180°) is planar,
while DHA
(α = 142.2°),
N-methylacridane
(α = 142.7°) and
thioxanthene
(α = 133.3°) have
non-planar geometries. Deprotonation of 1a–d at C9
leads to a completely flat structure for xanthenide 2b
(α = 180°) and
significantly flattened molecules for DHA- 2a
(α = 153.3°),
N-methylacridanide 2c
(α = 157.6°) and
thioxanthenide anion 2d
(α = 150.0°). The
calculated charge distributions of these anions are found to correlate
well with the experimentally determined 13C NMR chemical
shifts. The combined data from net charge distributions and carbon
chemical shifts indicate that the heteroanthracenide anions 2b–d
may be characterized as extensively delocalized 16
π-electron systems in which oxygen and nitrogen anions on
the one hand and a sulfur analogue on the other exhibit some
fundamentally different charge distribution pattern. While the extent of
overall delocalization of the benzylic negative charge increases in the
order of O < N < S, the reverse order
S < N < O is observed with regard to
the extent of charge delocalization into the benzenoid moieties. This
observed discrepancy may be explained by the second-row nature of the
sulfur atom and its ability to stabilize an adjacent negative
charge.
TL;DR: Results suggest that halogen atoms, especially the iodine atom, in xanthene dyes play an important role in regulation of Ig production.
Abstract: The effects of food additives on immunoglobulin produced in rat splenic lymphocytes were examined. The xanthene dye, Rose Bengal, enhanced IgE production, while inhibiting the production of IgG and IgM, at 50 μμ. Among the xanthene dyes, Rose Bengal having 4 iodine and 4 chlorine atoms exerted the highest Ig production- regulating activity in splenocytes, and dihalogenated fluorescein, a diiodo compound, exerted similar activity, while the dichloro and dibromo compounds did not. These results suggest that halogen atoms, especially the iodine atom, in xanthene dyes play an important role in regulation of Ig production.
TL;DR: The reaction of 2-hydroxynaphth-1-yl)xanthene with morpholine yields 4-Nmorpholino-1,2-naphthoquinone 2 (in air) or 9H-dibenzo[a,j]-9-(2-hydroxy-1 naphthaldehyde 1]-Xanthene 3 (in argon).
TL;DR: A new route for the preparation of XANTHENE DERIVATIVES USING FRIEDEL-CRAFTS INTRAMOLECULAR CYCLOBENZYLATION is described in this article.
Patent•
04 Mar 1997TL;DR: Xanthene derivatives represented by the general formula: wherein R1 is a carboxyl group which may be esterified or amidated; R2 is a hydrogen atom, a hydroxyl group, or a hydrocarbon group which can be substituted; R3 and R4 are the same or different and are a hydoxyl group and R5 and R6 are a hydrogen atoms or a halogen atom.
Abstract: Xanthene derivatives represented by the general formula: wherein R1 is a carboxyl group which may be esterified or amidated; R2 is a hydrogen atom, a hydroxyl group, or a hydrocarbon group which may be substituted; R3 and R4 are the same or different and are a hydroxyl group which may be substituted; R5 and R6 are a hydrogen atom or a halogen atom; R7 is a hydrogen atom, a nitro group, a halogen atom, a hydrocarbon group which may be substituted, a heterocyclic group which may be substituted, or an acyl group which may be substituted; n is an integer of 0 to 2; and Y is an oxygen atom or two hydrogen atoms; and when n is 0, R2 may be a group represented by the formula: wherein the symbols have the same meanings as defined above, or a salt thereof inhibit a binding of B7-1 to CD28, prevent the B7-1-dependent activation of T cells and inhibit IL-2 production from T cells, thus being used as an immunomodulator such as a graft rejection inhibitor or a pharmaceutical composition for therapeutic treatment of allergy, rheumatoid arthritis, autoimmune disease, nephritis, diabetes mellitus and so on; and a microorgansim, Aspergillus terreus FL- 67283 strain, capable of producing some of the compounds according to formula (I); and a method for screening for a compound having an activity for inhibiting or enhancing a binding of CD28 to B7-1, or a salt thereof, which comprises comparing (1) an amount of binding between CD28 and B7-1-Ig obtained when CHO-cell containing CD28 or its cell membrane fraction is contacted with soluble B7-1-Ig, with (2) an amount of binding between CD28 and B7-1-Ig obtained when CHO-cell containing CD28 or its cell membrane fraction is contacted with soluble B7-1-Ig and a test compound; and a CHO cell designated by CD28-CHO-11 (FERM BP-5431), a CHO cell represented by B7-1-CHO-22 (FERM BP-5430) or a CHO cell represented by sB7-1-Ig-CHO-20 (FERM BP-5432)
Journal Article•
TL;DR: The xanthene moiety in the title compound, C 28 H 31 -N 2 O 3 +.I -.H 2 O, is planar, with the attached phenyl ring twisted by -78.8 (6)° from the molecular plane as discussed by the authors.
Abstract: The xanthene moiety in the title compound, C 28 H 31 -N 2 O 3 + .I - .H 2 O, is planar, with the attached phenyl ring twisted by -78.8 (6)° from the molecular plane. Of the two ethylamino groups, one is coplanar and the other makes a dihedral angle of 152.1(5)° with the xanthene ring system. The positive charge of the cation is delocalized and both N-C sp 2 bonds show double-bond character.
TL;DR: In this article, the photochemical properties of a series of xanthene dye bis(diphenyliodonium) salts (XT(JPh2)2) were compared.
Abstract: The photochemical properties of a series of xanthene dye bis(diphenyliodonium) salts (XT(JPh2)2) were compared. The results of fluorescence quenching demonstrate that the electron transfer of XT(Iph2)2 is mainly from ion pair and the quenching rate constants approach 1011-12M-1s-1 that is well above the rate limit controlled by diffusion. Effects of halogen substituents in the ortho positions adjacent to phenoxyl group in xanthene moiety directly affect their photoreactivities and dark storage stabilities. XT(Iph2)2 salts were applicable for vinyl monomers and the efficiency of polymerization depends on the rate of photogeneration of active radicals. Effects of solvent polarity and concentration of XT(Iph2)2 were also investigated.
TL;DR: In this article, a unique synthesis of functionalised α-tetralones has emerged from cyclic and acyclic carbon nucleophiles with 2 substituted 1,3-oxazinanes.
Abstract: Acid catalysed condensations of various 2 substituted 1,3-oxazinanes 3 and 1,3-oxazolidines 4 with cyclic carbon nucleophiles viz. 5,5-dimethyl-1,3-cyclohexanedione and 1,3-cyclohexanedione furnish xanthene derivatives, whereas a Knoevenagel reaction proceeds with acyclic nucleophiles. In case of 4b and 4c, a unique synthesis of functionalised α-tetralones has emerged. Reactions of mixtures of cyclic and acyclic carbon nucleophiles with 3 provide some functionalised and partially reduced benzopyran derivatives.
TL;DR: Bis(15crown-5 ether) derivatized from a xanthene-4,5-dicarboxylic acid skeleton was studied as an ionophore for a new K + -selective electrode as discussed by the authors.
Abstract: Bis(15-crown-5 ether) derivatized from a xanthene-4,5-dicarboxylic acid skeleton was studied as an ionophore for a new K + -selective electrode. The polymeric liquid membrane based on this ionophore exhibits Nernstian behavior and optimization of experimental conditions for potentiometric analysis offers a wide linear dynamic range, reasonable detection limit, good durability and hysteresis within a limited error. Due to the well-preorganized structure, the selectivity over Na + is comparable to those of commercialized K + -selective ionophores and the interferences by some cations such as Rb + and Cs + are reduced. Except slightly slow response, the enhanced recognition ability is reminiscent of the natural antibiotic valinomycin.
TL;DR: In this paper, the photochemistry of 9-xanthenyl radicals produced by pulse radiolysis of xanthene in 1,2-dichloroethane and CCl4 was studied by means of successive laser flash photolysis.
Abstract: The photochemistry of 9-xanthenyl radicals produced by pulse radiolysis of xanthene in 1,2-dichloroethane (1,2-DCE) and CCl4 was studied by means of successive laser flash photolysis. Photobleaching due to chlorine atom transfer from solvents to the excited 9-xanthenyl radical was observed with quantum yields of 0.04 and 0.29 in 1,2-DCE and CCl4, respectively.
Patent•
04 Mar 1997TL;DR: Xanthene derivatives represented by the general formula: (see fig. I) wherein R1 is a carboxyl group which may be esterified or amidated; R~ is a hydrogen atom, a hydroxyl group, or a hydrocarbon group which can be substituted; R3 and R4 are the same or different and are a hydoxyyl group and R5 and R6 are a hydrogen atoms or a halogen atom; R7 is an oxygen atom or two hydrogen atoms; n is an integer of 0 to 2; and when n is 0,
Abstract: Xanthene derivatives represented by the general formula: (see fig. I) wherein R1 is a carboxyl group which may be esterified or amidated; R~ is a hydrogen atom, a hydroxyl group, or a hydrocarbon group which may be substituted; R3 and R4 are the same or different and are a hydroxyl group which may be substituted; R5 and R6 are a hydrogen atom or a halogen atom; R7 is a hydrogen atom, a nitro group, a halogen atom, a hydrocarbon group which may be substituted, a heterocyclic group which may be substituted, or an acyl group which may be substituted; n is an integer of 0 to 2; and Y is an oxygen atom or two hydrogen atoms; and when n is 0, R~ may be a group represented by the formula: (see fig. II) wherein the symbols have the same meanings as defined above, or a salt thereof inhibit a binding of B7-1 to CD28, prevent the B7-1-dependent activation of T cells and inhibit IL-2 production from T cells, thus being used as an immunomodulator such as a graft rejection inhibitor or a pharmaceutical composition for therapeutic treatment of allergy, rheumatoid arthritis, autoimmune disease, nephritis, diabetes mellitus and so on.
Patent•
11 Jun 1997
TL;DR: In this article, a process for preparing sedalcor as anti-choline drug and its intermediate xanthene-9-carboxylic acid includes hydrolyzing 9-cyanoxanthene to obtain Xanthene 9-sodium carboxylate, in alkaline aqueoussolution state removing impurities with epiethylin extraction, and then through neutralization reaction to obtain xanthen-9 carboxyric acid.
Abstract: A process for preparing sedalcor as anti-choline drug and its intermediate xanthene-9-carboxylic acid includes hydrolyzing 9-cyanoxanthene to obtain xanthene-9-sodium carboxylate, in alkaline aqueoussolution state removing impurities with epiethylin extraction, and then through neutralization reaction to obtain xanthene-9-carboxylic acid, finally through esterification and salt-forming reaction to obtain sedalcor.
Journal Article•
TL;DR: In this paper, a series of xanthene dyes bearing a tert-butyl peroxybenzoate moiety was synthesized and the fluorescence and phosphorescence spectra were measured to determine the photoproperties of these dyes.
Abstract: A series of xanthene dyes bearing a tert-butyl peroxybenzoate moiety was synthesized. The fluorescence and phosphorescence spectra were measured to determine the photoproperties of xanthene dye peresters. The transient phenomena were also examined by nanosecond laser flash photolysis in organic solvents at room temperature. Furthermore, the photodecomposition behavior of these compounds was followed by UV-VIS absorption and the final decomposition products were distinguished by comparing IR spectra before and after the irradiation with an Ar + laser at 514.5 nm. To prove their application to information recording materials, the sensitivities for the visible light initiating system are also reported.