Showing papers by "University of Rajasthan published in 1977"
TL;DR: In this article, der Ubersichtsartikel befast sich mit der Darstellung, der Rontgenstrukturanalyse und den spektroskopischen Eigenschaften von uber 80 Metallchelaten von fluorierten 1,3-Diketonen.
147 citations
TL;DR: In this article, 18 new volatile N-substituted salicylideneiminatotrialkyltin derivatives have been synthesized by the reactions of trialkyl-ltin chlorides or alkoxides with the corresponding Schiff bases.
43 citations
TL;DR: In this paper, experimental results of the interactions of 400 GeV/c protons with emulsion nuclei are presented, and the energy dependence of N S 〉 and the parameters R em, R eq and R 2 are examined.
29 citations
TL;DR: In this paper, three new volatile trialkyltin derivatives of sulphur containing Schiff bases have been synthesized by the reactions of trimethyltin hydroxide with 2,2-disubstituted benzothiazolines.
19 citations
TL;DR: In this paper, the angular variation of the quadrupole doublet ratio for the two resolved sites in biotite single crystals is studied by Mossbauer absorption and it is shown that this angular variation is consistent with the assumption that the EFG principal Z-axis for the prominent M2 site is distributed on a cone of half angle 20°, the axis lying normal to the layer.
Abstract: The angular variation of the quadrupole doublet ratio for the two resolved sites in biotite single crystals is studied by Mossbauer absorption. It is shown that the angular variation is consistent with the assumption that the EFG principal Z-axis for the prominent M2 site is distributed on a cone of half angle 20°, the axis lying normal to the layer. This model is justified from the known poly-typism of biotite. The lower and higher energy lines of the quadrupole doublet are identified with I3/2 and I1/2 respectively, indicating that the quadrupole coupling constant in M2 site is negative.
Es wird die Winkelanderung der Quadrupol-Dublettaufspaltung fur zwei aufgeloste Platze in Biotit-Einkristallen mit Mosbauerspektroskopie untersucht. Es wird gezeigt, das die Winkelanderung mit der Annahme konsistent ist, das dieEFG-Haupt-Z-Achse fur den besonderen M2-Platz auf einem Kegel mit dem Halbwinkel 20° verteilt ist, dessen Achse zur Schicht normal liegt. Dieses Modell wird mit dem bekannten Polytypismus von Biotit gerechtfertigt. Die Nieder- und Hoch-energielinie des Quadrupoldubletts wird mit I3/2 bzw. I1/2 identifiziert, was darauf hinweist, das die Quadrupolkopplungskonstante der M2-Platze negativ ist.
16 citations
TL;DR: Eleven fluorine containing condensed thiazoles have been synthesized and characterized by spectral (IR and NMR) studies and fungicidal activity of some representative compounds has been evaluated.
Abstract: Eleven fluorine containing condensed thiazoles have been synthesized and characterized by spectral (IR and NMR) studies. Fungicidal activity of some representative compounds has also been evaluated.
16 citations
Journal Article•
TL;DR: The Dariba Main Lode is characterized by a complex assemblage of metallic sulphides and sulphosalts as discussed by the authors, and the ore features suggest that the Rajpura-Dariba-Bethumni deposits are essentially syn-sedimentary.
Abstract: The Dariba Main Lode is characterized by a complex assemblage of metallic sulphides and sulphosalts. Primary sedimentary fabric is evident by the occurrence of sphalerite, pyrite and occasionally galena, and rarely chalcopyrite, in the form of conformable layers, interbedded with the host rocks throughout the exposed length in the underground mine. Early diagenetic pyrite is found as tiny isolated grains as well as framboids, in which the first form is always dominating. This reflects two different pathways of pyrite formation. Distinct mesoscopic folds are found in the bedded ores which show their general trend congruous to the "major folds of the region. ' Healed' breccias and fractures often occur associated with the folded and conformable ores in which the sulphides appear mobilized and recrystallized. Folded pyrite-graphite schist laminites show excellently developed axial and bedding plane cleavages along which the pyrite has been recrystallized into aggregates of elongated crystals due to outlasting effect of shears. Pressure shadow structures showing elongated crystals of pyrite bordered by sphalerite and/or galena are also frequently observed along the bedding plane cleavages. Typical metablastic textures are exhibited by large euhedral crystals of pyrite and arsenopyrite and triple-point junctions shown by sphalerite and pyrite. The ore features suggest that the Rajpura-Dariba-Bethumni deposits are essentially syn-sedimentary.
14 citations
13 citations
TL;DR: In this paper, the authors show that the rate law (1) is obeyed if [HClO4]i > [DMF]i, and the rate (2) is observed when [HCLO4i]i>DMFi.
13 citations
TL;DR: In this article, the synthesis of B(OEt)(SB) and B(SB)(SBH) types of derivatives (where SB− and SBH− are the anions of the Schiff bases, SBH2) is reported.
Abstract: Synthesis of B(OEt)(SB) and B(SB)(SBH) types of derivatives (where SB− and SBH− are the anions of the Schiff bases, SBH2) is reported. These are formed by 1:1 and 1:2 molar reactions of boron ethoxide with the bifunctional tridentate Schiff bases such as 3-(2-hydroxyethyl)amino-1-phenyl-2-buten-1-one, 3-(2-hydroxy-n-propyl)amino-1-phenyl-2-buten-1-one and 3-(2-hydroxyphenyl)amino-1-phenyl-2-buten-1-one respectively. The labile nature of the ethoxy groups in 1:1 derivatives has been shown by carrying out exchange reactions with an excess of t-butyl alcohol. The resulting derivatives have been characterized by elemental analysis, molecular weight determinations, conductance measurements and infrared and proton magnetic resonance spectra.
12 citations
TL;DR: In this paper, the insertion reactions of zirconium aminoalkoxides have been studied for the first time and have been shown to yield interesting derivatives with Zr-N bonds.
Abstract: N-Methylaminoalkoxides of zirconium of the type, Zr(OPri)4-n(O.CHR′.CH2.NR″R′)n, where R′ = R′ = H, R′ = Me; R′ = H, R′ = R′ = Me; R′ = R′ = R′ = Me; and n = 1–4, have been synthesized by the reactions of zirconium isopropoxide with aminoalcohols. These are characterized by elemental analyses and IR spectra. Insertion reactions of zirconium aminoalkoxides have been studied for the first time and have been shown to yield interesting derivatives with Zr-N bonds.
TL;DR: In this article, the formation constants of the resulting mixed ligand complexes have been calculated at 30 ± 1°C (μ = 0.1 KNO3), and the order of the stability in terms of the metal ions has been found to be: Ni(II) > Zn(II), > Cd(II); secondary ligands: gly > ala > norleu.
TL;DR: The MPG was found to provide ample protection to the liver leading to an accelerated recovery and restoring the normal structure by 4 weeks after irradiation.
Abstract: The present study is an attempt to investigate the protection imparted by MPG (2-mercaptopropionylglycine) to liver in Swiss albino mice against damages caused by external irradiation. The histopathological changes in the liver of a group of mice exposed to 1000 R of Co-60 gamma rays 15-30 minutes after an intraperitoneal injection of 20 mg/kg body weight of MPG were studied at different post-irradiation intervals. The results were compared with those received from a control group which was irradiated in the absence of the drug. The MPG was found to provide ample protection to the liver leading to an accelerated recovery and restoring the normal structure by 4 weeks after irradiation.
TL;DR: An axiomatic characterization of non-additive measures of information associated with a pair of probability distributions having the same number of elements has been given and this quantity under additional suitable postulates leads to the non- additive Entropy, Directed-Divergence and Inaccuracy of one or more parameters.
Abstract: An axiomatic characterization of non-additive measures of information associated with a pair of probability distributions having the same number of elements has been given. This quantity under additional suitable postulates leads to the non-additive Entropy, Directed-Divergence and Inaccuracy of one or more parameters.
TL;DR: It was found that MPG, when given 30 minutes before irradiation, protected the thymus tissue and caused an early regeneration of the organ as indicated by the presence of dividing cells in different stages of mitosis in both cortex and medulla as early as 72 hours postirradiation.
Abstract: Normal adult male Swiss albino mice, weighing 25 g on the average, were exposed to 500 R gamma rays from a Cobalt-60 source in the presence and absence of the chemical MPG or 2mercaptopropionyiglycine and histological studies of thymus were conducted at various postirradiation intervals. It was found that MPG, when given 30 minutes before irradiation, protected the thymus tissue and caused an early regeneration of the organ as indicated by the presence of dividing cells in different stages of mitosis in both cortex and medulla as early as 72 hours postirradiation. The normal structure was regained by the end of two weeks in this group in contrast to the unprotected controls where recovery was not complete even at the end of four weeks after exposure. MPG when given 30 minutes after exposure is not so effective, even though protection is afforded in this case also. The mechanism of action of this drug is not known.
TL;DR: In this paper, a white precipitate of antimony(III) phosphate with absorbed antimony (V) is formed, and the rate does not depend on the concentration of the reducing substance and the mechanism is essentially a hydrolytic one.
TL;DR: In a preliminary attempt to investigate the protective action of MPG on the tissues of mammals exsosed to high doses of ionizing radiations, adult Swiss albino mice were subjected to 1, 200 R of gamma rays from a Co-60 source 30 minutes after a single intraperitoneal injection of MPG.
Abstract: In a preliminary attempt to investigate the protective action of MPG on the tissues of mammals exsosed to high doses of ionizing radiations, adult Swiss albino mice were subjected to 1, 200 R of gamma rays from a Co-60 source 30 minutes after a single intraperitoneal injection of 20 mg/kg body weight of the drug. The histopathological changes in the intestinal villi were studied at postirradiation intervals of 2, 5, 14 and 28 days and were compared with observations from mice irradiated in the absence of MPG. Severe damage was observed in the villi of the animals receiving no protective drug, whereas in the MPG injected group the villi were protected to some extent and an early recovery was effected with the result that the normal structure was restored by the last interval studied.
TL;DR: In this paper, the rate of peroxydiphosphate (perox) was investigated for a much wider range of concentrations of iodide and an extended range of concentration of hydrogen ions.
TL;DR: In this article, a large number of new fluorinated β-diketones of the type: ArCOCH 2 COR′, have been prepared from the corresponding fluorinated acetophenones and appropriate esters in the presence of sodamide.
Abstract: A large number of new fluorinated β-diketones of the type: ArCOCH 2 COR′, have been prepared from the corresponding fluorinated acetophenones and appropriate esters in the presence of sodamide. They have been characterized as their copper chelates. The IR spectroscopic data for the β-diketones and their chelates have been recorded and are discussed with special reference to the effect of Ar and R′ on the CO bond. The 1 H NMR and 19 F NMR spectra of the β-diketones have also been recorded. The β-diketones do not show any band around 1725 cm −1 , nor any band in the conjugated ketonic region and indeed the keto form is not detectable on the basis of IR and NMR spectroscopic studies.
TL;DR: In this paper, a 1:1 Ln(III)-CDTA binary chelate with certain hydroxy acids such as glycollic (GA), lactic (LA) and malic (MEA) is described.
TL;DR: In this article, the effect of various sodium and potassium halides, different cations (alkali and alkaline earth metal chloride), various alkali metal nitrates and some ammonium salts, on the polarographic characteristics of iodate ions, have been studied in details, iR measurements have also been carried out in presence of various oxy-anions and sodium salts of organic acids.
01 Jan 1977
TL;DR: The structure and development of the root nodule ofasuarina equisetifolia have been studied.
Abstract: The structure and development of the root nodule ofCasuarina equisetifolia have been studied.
TL;DR: Several newSchiff base derivatives of antimony(III) isopropoxide with theSchiff bases having the donor system, O−N−O. In as discussed by the authors, the infrared spectra of the resulting complexes were recorded and tentative structures indicated.
Abstract: Several newSchiff base derivatives of antimony(III) have been synthesized by the reaction of antimony(III) isopropoxide with theSchiff bases having the donor system, O−N−O. The reactions in 1:1 and 2:3 molar ratios [Sb(O-i-C3H7)3: :Schiff base] have yielded Sb(O-i-C3H7) (SB) and Sb2 (SB)3 type of derivatives (whereSB represents the anion of theSchiff base andSBH2=o-hydroxyacetophenone-2-hydroxy-1-propylimine, o-hydroxycetophenone-3-hydroxy-1-propylimine, salicylidene-2-hydroxyethylamine, salicylidene-2-hydroxy-1-propylamine and 2-hydroxy-1-naphthylidene-2-hydroxyethylamine) resp. In the resultingSchiff base derivatives, the central antimony atom appears to be tetracoordinated as indicated by their monomeric state determined ebullioscopically. The infrared spectra of the resulting complexes have been recorded and tentative structures indicated. The thermogravimetric analysis of antimony-monoisopropoxysalicylidene-2-hydroxy-1-propylamine has also been carried out.
TL;DR: In this paper, the rate of the oxidation of formic acid by thallium(III) in (Li, H)ClO4 solutions is not affected by variation in hydrogen ion concentration and the experimental rate law, which is consistent with the mechanism which requires the formation of intermediate complex [HCOOHTl]3+ in a rapid preequilibrium followed by its slow decomposition to yield the final products.
Abstract: The rate of the oxidation of formic acid by thallium(III) in (Li, H)ClO4 solutions is not affected by variation in hydrogen ion concentration and the experimental rate law,
$$\frac{{ - d\left[ {T\left( {III} \right)} \right]}}{{d t}} = \frac{{k_1 K\left[ {T\left( {III} \right)} \right]\left[ {HCOOCH} \right]}}{{1 + K\left[ {HCOOH} \right]}}$$
is consistent with the mechanism which requires the formation of intermediate complex [HCOOHTl]3+ in a rapid preequilibrium followed by its slow decomposition to yield the final products. At 75°,k
1 andK have the values of 16±1×10−5 sec−1 and 7.3±0.5M
−1 resp.
TL;DR: Damage to the liver of adult mice caused by the radioprotective drug 2-mercaptopropionylglycine was found to be irreversible at the dose level of 500 mg/kg body-weight at the last interval studied.
Abstract: Undertaken study deals with any vulnerable changes by the radioprotective drug 2-mercaptopropionylglycine, after administering in variable concentration (20, 50, 100, 200 and 500 mg/kg body weight) of the liver of adult mice at 1, 3, 7 and 14 days interval. The lower doses, 20 and 50 mg/kg body-weight of MPG did not affect the liver at all while at higher doses of 100, 200 and 500 mg/kg body-weight of MPG, liver showed many histopathological changes in the form of cytoplasmic degranulation and vacuolation, pyknotic, necrotic, crenated and hypertypic nuclei, hyperaemia, and lymphocytic infiltration etc. These damages were found to be irreversible at the dose level of 500 mg/kg body-weight at the last interval studied.
01 May 1977
TL;DR: Seed morphology, seed coat development and structure have been studied in Tephrosia species and the nucellus persists for a long time at the chalazal end in the form of nucellar pad in both of the species.
Abstract: Seed morphology, seed coat development and structure have been studied inCrotalaria burhia Buch-Ham.,C. medicaginea Lamk.,Tephrosia hamiltonii Drumm. andT. apollinea Link. Seed coat is formed by the outer integument alone. Inner integument plays no role in its formation and degenerates. InTephrosia species, the inner layer of inner integument acts as an integumentary tapetum. The nucellus persists for a long time at the chalazal end in the form of nucellar pad in both of theTephrosia species.
TL;DR: In this article, the rates of several substitution and electron transfer reactions of monohalogeno complexes of cobalt(III) and chromium (III) have been correlated successfully with the LFER (1), log k = mδ x + c where k is the rate constant, δ x is partial charge on bound halogen in M X bond and m and c are empirical constants.
TL;DR: In this paper, specific magnetic susceptibilities of newly synthesized chelates of some of the lanthanons [La(III), Pr(III) and Nd(III)] are reported.
Abstract: Specific magnetic susceptibilities (χs) of several newly synthesized chelates of some of the lanthanons [La(III), Pr(III) and Nd(III)] are reported. These derivatives are of the general type,Ln(O-i-C3H7)3−n(C6H5CH∶NRO) n [where,Ln=La(III), Pr(III) or Nd(III);n=1 or 2 and R=CH2CH2, CH2CHCH3 or C6H4] and have been prepared by the reaction of the alkoxides of the lanthanons withSchiff bases such as benzylidene-2-hydroxyethylamine (C6H5CH∶NCH2CH2OH), benzylidene-2-hydroxy-n-propylamine (C6H5CH∶NCH2CHOHCH3) and benzylidene-o-aminophenol (C6H5CH∶NC6H4OH) in different molar relations in dry benzene.