Bimetallic nickel complexes with bridging dithiolato Schiff base ligands: synthesis, mass spectral characterisation and electrochemistry

摘要

Schiff base dithiols with thiophene or phenyl linkers were prepared from condensation of the dialdehydes 2,5-(OHC)(2)C4H2S, 1,3-(OHC)(2)C6H4, 1,4-(OHC)(2)C6H4 and 1,4'-(OHC)(2)(C6H4)(2) with 4-H2NC6H4(SH). The Schiff base dithiols readily reacted with Ni(eta(5)- C5H5)(PR3)Br (R = Bu or Ph) in the presence of Et3N to form bimetallic complexes (eta(5)-C5H5)(PR3)Ni-SC6H4N=C(H)ArC(H)= NC6H4S-Ni(PR3)(eta(5)-C5H5) (Ar = C4H2S (6), 1,3-C6H4 (7), 1,4-C6H4 (8), 1,4'-(C6H4)(2) (9). The bimetallic nature was established from elemental analysis and mass spectrometry. Cyclic voltammetry of complexes 6, 8 and 9 are indicative of electronic communication between the nickel centres via the bridging dithiolato Schiff base ligands. (C) 2002 Elsevier Science B.V. All rights reserved. [References: 33]