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Journal ArticleDOI

Studies on the different forms of some mixed chelate complexes of dioxouranium(VI) with cupferron

TL;DR: In this paper, a series of mixed chelate complexes of identical composition of the type (NH4)2[UO2(L)2B] and (NH 4]2 [UO 2(L 2B] 2X2] have been thoroughly characterised through elemental analysis, conductance data, X-ray, IR, electronic, NMR spectra as well as thermogravimetric and differential thermal analyses.
About: This article is published in Journal of Inorganic and Nuclear Chemistry.The article was published on 1980-01-01. It has received 9 citations till now. The article focuses on the topics: Cupferron & Uranyl.
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Journal ArticleDOI
TL;DR: In this paper, a relation between symmetric V1 and asymmetric v3 O-U-O frequencies independent on the masses of oxygen (Mo) and uranium (Mu) atoms was proposed.
Abstract: New series of uranyl complexes derived from 7-formyl-8-hydroxy quinoline with hydrazine hydrate (HL1), methyl hydrazine (HL2), 1,2-diaminoethane (HL3), 1,2-diaminobenzene (HL4) and 2-aminopyridine (HL5) have been prepared and characterized by elemental analyses, (1H NMR and 13C NMR, electronic and vibrational spectra) and different physical techniques. The magnetic and spectral data suggest a distorted octahedral structure for all complexes. The labile EtOH molecule in compounds (5), (7) and (9) is equatorially bonded to the uranium ion and its hydrogen is bonded to the axial oxygen of the uranyl moiety. The ligands contain intramolecular hydrogen bonds. The FU-O(mydn/Ao) and the bond length RU-O(Ao) of the bond were calculated from the IR data. In the present work it has been proposed a novel relationship between symmetric “V1” and asymmetric “v3” O-U-O frequencies independent on the masses of oxygen (Mo) and uranium (Mu) atoms.

39 citations

Journal ArticleDOI
TL;DR: A series of dioxouranium(VI) complexes with 7-carboxaldehyde-8hydroxyquinoline (oxine) and with some of its Schiff bases, LH, have been prepared and characterized by elemental analyses, electronic and vibrational spectral studies as discussed by the authors.
Abstract: A series of dioxouranium(VI) complexes with 7-carboxaldehyde-8hydroxyquinoline (oxine) and with some of its Schiff bases, LH, have been prepared and characterized by elemental analyses, electronic and vibrational spectral studies. All complexes except those of the oxine have the [UO2L2] · EtOH, stoichiometry (n=0, 1, 2 or 4). The uranyl complexes of the oxine have the formula [UO2L2(LH)]. The i.r. spectra reveal all ligands to be monobasic bidentate chelating agents coordinated to the uranium(VI)via the enolized phenolic OH and aldehydic oxygen or azomethine nitrogen atom. The force constant fU-o (mdyn A) and the bond length rU-o (A) of the U-O bond are also calculated and related to the electronic properties of thep-substituents.

26 citations

Journal ArticleDOI
TL;DR: A series of complexes formed by the interaction of UO2 (AcO)2 and some potentially bidentate ligands, aniline, o-hydroxy, carboxaldehyde, 8- hydroxyqvinoline abbreviated as ML1, H2L2, H 2L3, HL4, HL5 and HL6, respectively, have been synthesized as mentioned in this paper.
Abstract: A series of complexes formed, by the interaction of UO2 (AcO)2. 2H2 O and some potentially bidentate ligands, aniline, o-hydroxy, o-carboxy, o-chloro, o-methoxy and o-methylaniline-7- carboxaldehyde-8- hydroxyqvinoline abbreviated as ML1., H2L2, H2L3, HL4, HL5 and HL6, respectively, viated as HL1 H2L2, H2L3., HL4., HL5., and HL6, respectively have been synthesized. The products wre characterized by elemental analyses, magnetic moments and spectral measurements. All the ligands behave as monobasic bidentate chelating agents coordinating to the uranium(VI) ion via the deprotonated phenolic OH and aldehydic oxygen and/or azomethine nitrogen. Thermal stabilities of the ligands and complexes have been s tudied using thennogravimetric analysis (TGA).

12 citations

Journal ArticleDOI
TL;DR: In this article, the properties of benzil bis(4-phenylthiosemicarbazone), H2BPT, and its ligand were investigated using elemental analysis, molar conductivity, magnetic susceptibility and spectroscopic measurements.
Abstract: Complexes of CoII, NiII, CuII, ZnII, CdII, HgII and UO 2 II with benzil bis(4-phenylthiosemicarbazone), H2BPT, have been synthesized and their structures assigned based on elemental analysis, molar conductivity, magnetic susceptibility and spectroscopic measurements. The i.r. spectra suggest that the ligand behaves as a binegative quadridentate (NSSN) (CoII, CuII, HgII and UO 2 II complexes) or as a binegative quadridentate-neutral bidentate chelating agent (NiII, ZnII and CdII complexes). Octahedral structures for the CoII and NiII complexes and square-planar structure for the CuII complex are suggested on the basis of magnetic and spectral evidence. The crystal field parameters (Dq, B andμ B) for the CoII complex are calculated and agree fairly well with the values reported for known octahedral complexes. The ligand can be used for the microdetermination of NiII ions of concentration in the 0.4–6×10−4 mol l−1 range and the apparent formation constant for the species generated in solution has also been calculated.

8 citations

Journal ArticleDOI
TL;DR: Mixed ligand complexes of dioxouranium (VI) of the type [UO2(Q)(L)·2H2O] have been synthesized using 8-hydroxyquinoline (HQ) as a primary ligand and amino acids such as L-threonine, L-tryptophan, and L-isoleucine as secondary ligands to study the antibacterial activity of the complexes.
Abstract: Mixed ligand complexes of dioxouranium (VI) of the type [UO(2)(Q)(L)·2H(2)O] have been synthesized using 8-hydroxyquinoline (HQ) as a primary ligand and amino acids (HL) such as L-threonine, L-tryptophan, and L-isoleucine as secondary ligands. The metal complexes have been characterized by elemental analysis, electrical conductance, magnetic susceptibility measurements, and spectral and thermal studies. The electrical conductance studies of the complexes indicate their nonelectrolytic nature. Magnetic susceptibility measurements revealed diamagnetic nature of the complexes. Electronic absorption spectra of the complexes show intraligand and charge transfer transitions, respectively. Bonding of the metal ion through N- and O-donor atoms of the ligands is revealed by IR studies, and the chemical environment of the protons is confirmed by NMR studies. The thermal analysis data of the complexes indicate the presence of coordinated water molecules. The agar cup and tube dilution methods have been used to study the antibacterial activity of the complexes against the pathogenic bacteria S. aureus, C. diphtheriae, S. typhi, and E. coli.

8 citations


Cites background from "Studies on the different forms of s..."

  • ...Numerous uranium complexes and their mixed chelates have been studied [6, 7]....

    [...]

References
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Journal ArticleDOI
A. Marzotto1
TL;DR: In this paper, the tripeptide glutathione complexes of different molar ratios were prepared and studied by IR, PMR, electronic absorption and circular dichroism spectra.

17 citations

Journal ArticleDOI
TL;DR: The proton magnetic resonance spectra of the synergistic complexes of uranyl β-diketonates with dihexyl sulphoxide as the neutral donor give a multiplet consisting of eight lines for the terminal methylene group protons adjacent to the sulphur atom of the sulphoxide as discussed by the authors.
Abstract: The proton magnetic resonance spectra of the synergistic complexes of uranyl β-diketonates with dihexyl sulphoxide as the neutral donor give a multiplet consisting of eight lines for the terminal methylene group protons adjacent to the sulphur atom of the sulphoxide and a triplet for the β-methylene protons. This conforms to an ABX2 pattern arising as a result of nonequivalence of the two protons of the terminal methylene group as a result of steric hindrance to free rotation about the C-S bond. The presence of such restricted rotation has been adduced as evidence for a direct donor-metal bond.

15 citations

Journal ArticleDOI
TL;DR: In this paper, a comparison of the spectra of various rare earth cupferrates and the sodium salt shows that there is a change in covalency from sodium cupferrate to lanthanum Cupferrate.

14 citations