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- W2893325868 abstract "Abstract Six closely related [UO2L′(solvent)] complexes, where Lꞌ is the N-2-hydroxy-3-methoxybenzaldehyde-N′-2′-hydroxyacetophenone-S(R)isothiosemicarbazone ligand (R = methyl, ethyl, allyl, butyl, pentyl and benzyl), are synthesized. Characterization of the complexes is accomplished using elemental analysis, FT-IR, 13C and 1H NMR and UV–Vis spectroscopic techniques. Fluorescence emission of the complex with R = benzyl gives the maximum quantum yield while in the other complexes the quantum yield decreases markedly with increasing length of the linear R groups. TGA/DSC shows that the thermal stability decreases to the length of the R group. Crystal structures of the complexes determined by X-ray crystallography indicate that the tetradentate isothiosemicarbazone ligands in addition to solvent molecule are coordinated to the uranyl center in distorted pentagonal bipyramid geometries. All of the six uranyl complexes form dimers through some pairwise hydrogen bonds mainly between OH of solvent molecules and phenoxy oxygen atoms. Molecular geometries and vibrational frequencies are compared using the density functional method (B3LYP) with the SDD basis set for uranium and 6-311G++(d,p) basis set for the other atoms. Electronic absorption spectra of compounds are predicted with TD-DFT studies and HOMO-LUMO orbitals as well as charge delocalization are determined using natural bond orbital analysis." @default.
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- W2893325868 date "2019-01-01" @default.
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- W2893325868 title "A theoretical and experimental study of six novel new complexes of alkyl substituted isothiosemicarbazone" @default.
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- W2893325868 doi "https://doi.org/10.1016/j.ica.2018.09.055" @default.
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