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Transition Metal Complexes with the Thiosemicarbazide‐based ligands. XII. Complexes of nickel(II) with benzoylacetone S‐methylisothiosemicarbazone and N(1)‐2‐butylidene‐4‐oxo‐4‐phenyl‐N(4)‐salicylidene‐S‐methylisothiosemicarbazide
Author(s) -
Leovac V. M.,
Češljević V. I.,
Nešić S. M.
Publication year - 1991
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.19915920122
Subject(s) - chemistry , deprotonation , ligand (biochemistry) , nickel , pyridine , medicinal chemistry , moiety , stereochemistry , octahedron , transition metal , metal , crystallography , crystal structure , catalysis , organic chemistry , ion , biochemistry , receptor
A template synthesis procedure yielded [Ni(HL 1 )NH 3 ]I, where HL 1 is the monoanion of the terdentate ONN benzoylacetone S‐methylisothiosemicarbazone ligand. The reaction of this complex with an excess of NH 4 NCS, pyridine, or hydrazine resulted in the complexes [Ni(HL 1 )(NH 3 )NCS] and [Ni(L 1 )A] (A = Py, N 2 H 4 ). The monoanionic form of the ligand is obtained by deprotonation of the enolic form of the benzoylacetone moiety, whereas the dianion is formed by additional deprotonation of the terminal NH 2 group. Finally, the reaction of [Ni(HL 1 )NH 3 ]I with salicyladehyde produced the NiL 2 complex in which L 2 stands for the dianion of the ONNO ligand N(1)‐2‐butylidene‐4‐oxo‐4‐phenyl‐N(4)‐salicylidene‐S‐methylisothiosemicarbazide. All complexes are diamagnetic and have a square‐planar configuration, except for [Ni(HL 1 )(NH 3 )NCS], for which te data of i.r. spectra suggest a square‐pyramidal structure. The electronic absorption spectra of the ethanolic solutions of all complexes are characteristic of typical square‐planar coordination of nickel(II).