Journal ArticleDOI
Effect of substituents on the structure of dioxouranium(VI) complexes of 7-carboxaldehyde-8-hydroxyquinoline and some of its Schiff bases
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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.read more
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Supramolecular structures and stereochemical versatility of azoquinoline containing novel rare earth metal complexes.
TL;DR: Composition, conductance and IR spectral data of the complexes show that the HL acts as a bidentate monobasic ligand, and data indicate the weak involvement of the 4f orbitals in complex formation.
Journal ArticleDOI
Structural and models of dioxouranium(VI) with rhodanine azodyes--V.
TL;DR: The synthesis of several new coordination compounds of dioxouranium(VI) heterochelates with bidentate rhodanineazol compounds derived from r Rhodanine are described, showing a monobasic bidentates behaviour with the oxygen and azonitrogen donor system.
Journal ArticleDOI
Stereochemistry of uranyl complexes of new heterocyclic nitrogen containing aldehydes. i. novel relationship for o-u-o frequencies center
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.
Journal ArticleDOI
Stereochemistry of new nitrogen containing heterocyclic aldehyde. IX. Spectroscopic studies on novel mixed-ligand complexes of Rh(III)
TL;DR: An octahedral structure is proposed for all the new complexes in which chloride is attached to the metal ion in 1:1; 1:2 (metal:ligand) ratio.
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Synthesis and physico-chemical studies on transition metal complexes of symmetric bis-Schiff base ligands
TL;DR: In this paper, a series of symmetric bis-Schiff bases derived from 1,2-diaminoethane with bis-salicylaldehyde (H2L1) and/or bis-o-hydroxyacetophenone (H 2L2) have been prepared.
References
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Journal ArticleDOI
Electronic Structure, Spectra, and Magnetic Properties of Oxycations. III. Ligation Effects on the Infrared Spectrum of the Uranyl Ion
TL;DR: In this paper, a series of uranyl complexes KxUO2Ly(NO3)2, where L is the variable ligand (or ligands), has been prepared; it has been shown that a ligand series may be defined using the antisymmetric stretching frequency of the uranyl entity, and this series exhibits a remarkable parallelism with the spectrochemical series defined by Δ in octahedral complexes of transition metals of the first and 2nd series.
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Systematics in the vibrational spectra of uranyl complexes
TL;DR: In this paper, the U-O bond force constants for uranyl complexes from their infra-red absorption spectra were calculated using the Badger's rule relating the UO force constant to the bond distance.
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Synthesis and electron spin resonance studies of copper(II) complexes with acid amide derivatives of 2-amino and 2,6-diaminopyridine☆
TL;DR: In this paper, the reaction of copper(II) chloride, bromide, nitrate and perchlorate with acid amide ligands derived from 2-amino and 2,6-diamino pyridine was investigated.