Synthesis, characterisation and reactivity of trans-[Ru(L)(PPh3)Br-2]; L =2-pyridyl-N-(2 '-methylthiophenyl)methyleneimine - Crystal structure of trans-[Ru(L)(PPh3)Br-2]

Reaction of Ru(PPh3)(2)Br-2 with the NNS chelating tridentate ligand 2-pyri dyl-N-(2'-methylthiophenyl)methyleneimine (L) led to the isolation of the r uthenium(II) complex [Ru(L)(PPh3)Br-2]. Reactivity of this complex with dif ferent bidentate chelating ligands revealed that the products are quite dif ferent from those obtained by reacting Ru(L)(PPh3)Cl-2 (the corresponding c is dichloro complex) with the same ligands under comparable conditions. The mixed chelates were isolated and characterised by elemental analysis, magn etic moment measurement and by different spectroscopic methods along with t heir precursor. Electrochemistry of the complexes was examined by cyclic vo ltammetry using a platinum working electrode and a Ag/AgCl electrode as ref erence. The crystal structure of [Ru(L)(PPh3)Br-2] disclosed that, unlike R u(L)(PPh3)Cl-2, the two bromo ligands are in trans position and this explai ned the difference in its reactivity pattern from the corresponding chloro complex. (C) 1999 Elsevier Science Ltd. All rights reserved.