Ruthenium(II) carbonyl complexes containing tridentate Schiff bases

New ruthenium(II) complexes, [Ru(CO)(B)(LL') (PPh3)] (where, LL'=tridentate Schiff bases; B=PPh3, pyridine, piperidine or morpholine) have been prepared by reacting [RuHCl(CO)(PPh3)(3)] or [RuHCl(CO)(PPh3)(2)(B)] with Schiff bases containing donor groups (O, N, X) viz., salicylaldehyde thiosemicarbazone (X=S), salicylaldehyde semicarbazone (X=O), o-hydroxyacetophenone thiosemicarbazone (X=S) and o-hydroxyacetophenone semicarbazone (X=O). The new complexes were characterised by elemental analysis, spectral (i.r., H-1- and P-31-n.m.r.), data.