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.
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.
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TL;DR: In this article, a new dioxouranium (VI) heterochelates with neutral bidentate compounds (Ln) have been synthesized, and the ligands and their complexes were confirmed and characterized by elemental analysis, 1H NMR, UVVis, IR, mass spectroscopy, X-ray diffraction and thermogravimetric analysis.
61 citations
TL;DR: Novel five binuclear polymeric dioxouranium(VI) of azosulphadrugs of azobenzene sulphonamides were prepared for the first time and the resulting polymeric uranyl complexes were characterized on the basis of their elemental analyses, conductance and spectral (IR, NMR, and electronic spectra) data.
48 citations
TL;DR: Magnetic, electronic and IR spectral information commensurate that configurations of square planar copper(II) polymer complexes are coloured and appear to be nonelectrolytes in DMF.
44 citations
TL;DR: A series of novel bidentate azodye quinoline ligands synthesized with various p-aromatic amines with an octahedral and square planar geometry and it is found that the change of substituent affects the thermal properties of complexes.
42 citations
TL;DR: The electrical conduction mechanism of HL(n) ligands and their uranyl complexes has been investigated and was found to obey the variable range hopping mechanism (VRH).
41 citations
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TL;DR: In this article, the relation between the internuclear distances and force constants found for diatomic molecules is discussed, and it is shown that the relation can carry over to polyatomic molecules, with considerable accuracy.
Abstract: The relation between the internuclear distances and force constants found for diatomic molecules is discussed, and is shown to carry over to polyatomic molecules. It is shown that internuclear distances of polyatomic molecules can be predicted from vibrational data alone, with considerable accuracy.
596 citations
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.
Abstract: 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 1st and 2nd series. This parallelism has been rationalized using a mixed ligand field theory in which the uranyl ion is considered subject to bonding with ligands which are arranged hexagonally in a plane equatorial to the O–U–O axis. It is shown that the large changes of ν3 and ν1 are due primarily to electron population of the φu and δu atomic orbitals of uranium. Such population is physically equivalent to the reductions AmO2+ +→AmO2+ and NpO2+ +→NpO2+, which cause a decrease of approximately 100 cm—1 in ν3. It is further shown that Δν3 = — electrostatic effect — σ(L→M) — π(L→M) ± π(M→L), where in the last term the plus sign is the ...
367 citations
TL;DR: Several new dioxouranium(VI) complexes with the tridentate dibasic Schiff bases derived from salicylaldehyde, 5-chloro-, 5-bromo-5-nitro-, 3,5-dichloro-, 4-methoxy-, 5methoxysalicyloxy-3-naphthaldehyde, and 2-hydroxy-1-nphthaldehyde ando-aminobenzyl alcohol, have been synthesized from uranyl acetate dihydrate and the Schiff base in met
Abstract: Several new dioxouranium(VI) complexes with the tridentate dibasic Schiff bases derived from salicylaldehyde, 5-chloro-, 5-bromo-, 5-nitro-, 3,5-dichloro-, 4-methoxy-, 5-methoxy- and 3-ethoxysalicylaldehyde and 2-hydroxy-1-naphthaldehyde ando-aminobenzyl alcohol, have been synthesized from uranyl acetate dihydrate and the Schiff base in methanol The complexes are of the type UO2(AAA) MeOH (where AAAH2 = a tridentate dibasic Schiff base) The complexes have been characterized by elemental analyses, ir and electronic spectra, conductance, magnetic susceptibility and molecular weight measurements Thev (U=O) stretching frequency of the complexes occurs atca 900 cm−1 and the U-O distance is 174A The complexes are monomers, diamagnetic and octahedral
32 citations