The influence of the substituents at N1 nitrogen on geometry of nickel(II) complexes with heterocyclic thiosemicarbazones

The influence of the substituents (R) at the N-1 nitrogen of heterocyclic thiosemicarbazones {(C4H3X)-C(H)=N-3-(NH)-H-2-C-1(=S)(NHR)-H-1; X=O, Hftsc; S, Httsc} on the geometry of nickel(II) complexes was investigated. Furan-2-carbaldehyde thiosemicarbazones have formed both trans [Ni(ftsc-N-R)(2)] (R=Me, 1; Et. 2). and cis (R=Ph, 3), square planar complexes unlike thiophene-2-carbaldehyde thiosemicarbazones which yielded only trans square planar complexes [Ni(ttsc-N-R)(2)] (R= Me, 4: Et, S: Ph, 6). (C) 2008 Elsevier B.V. All rights reserved.