Synthesis, spectral and thermal investigations of some mixed ligand complexes of thorium(IV) derived from semicarbazones and diphenyl sulfoxide

Abstract

In the present work, the authors describe the synthesis of some mixed ligand complexes of thorium(IV) derived from 4[N-(2'-hydroxy-1'-naphthalidene)amino]antipyrine semicarbazone (HNAAPS) or 4[N-(cinnamalidene)amino]antipyrinesemicarbazone (CAAPS) as primary ligand and diphenyl sulfoxide (DPSO) as secondary ligand with the general composition ThX 4 .n(L).DPSO (n = 1, X = Cl, Br, NCS or NO 3 ; n = 2, X = I or ClO 4 , L = HNAAPS or CAAPS). All the compounds were characterized through elemental analysis, molar conductance, molecular weight, infrared data and thermogravimetric analysis. The infrared studies reveal that the semicarbazones behave as neutral tridentate (N,N,O) while DPSO coordinates through its oxygen atom. The nitrates are bicovalently bonded, while thiocyanates are N-coordinated in these compounds. In conclusion, the coordination number of the central metal ion displays coordination number 7, 8, 9 or 12 depending on the nature of the anionic ligands.

Cadmium and tin complexes of Schiff-base ligands

“…A common feature of all these spectra is that between 3500 and 3100 cm À1 they possess several bands, which are ascribed to (OH) of hydroxymethyl group and H 2 O, along with the (NH2) vibrations. The (NH) , which in spectra of free PLSC and PLTSC has been observed by Gopalakrishnan et al [147] at 3150 cm À1 , Agarwal et al [148], and Raman et al [149], is missing from spectra of singly deprotonated ligands. This also holds for (NH) from the pyridine ring, which in spectra of free ligands and complexes involving monoanionic ligands is observed at 2850 cm À1 ; this is absent from the spectra of complexes with dianionic form of ligands.…”

Synthesis and biological activities of polymer–thorium (IV) nanocomposites

“…Actinide metal ions are of great interest for the researchers due to their enormous size and high positive charge . Th(IV) is one of the best actinide metal ion and its chemistry presents an excellent area of research, because of its possibility to form compounds with high coordination number, a feature sparingly observed in transition metal chemistry . A high charge on vinylpyridine (VP)‐Thorium [Th(IV)] along with its effective ionic size enables it to form complexes with high coordination number .…”

Synthesis and characterization of the new Tetradentate Schiff base ligand type N4 derived From 4-animoantipyrine,4-dimethylaminobenzaldehyde, ethylenediamine and furfural, towards Fe(III), Co(II), Cu(II), Zn(II) and Hg(II) Ions

“…The FT.IR spectra for all prepared complexes showed different spectral data in comparison with the free ligand spectrum (table-3). All spectra exhibited shifting in the two iminc group (υC=N) at rang (1647-1658)cm -1 and (1593-1608)cm -1 in comparing with that in the free ligand at (1647)cm -1 and (1608)cm -1 (19). This shift in frequency in the position of the iminic group (υC=N) suggests a coordination between N atoms of the free ligand with metal ions (20).…”