Mono- and di-nuclear rhodium and palladium complexes of macrocyclic ligands containing the 2,6-di(thiomethyl)pyridine sub-unit

The synthesis of three macrocyclic ligands containing the 2,6-di(thiomethyl)pyridine sub-unit is reported. 25,26-Diaza-3,7,15,19-tetrathiatricycio[19.3.1.1^9,13] hexacosa-1 (25),9(26),10,12,21,23-hexene is a ditopic macrocycle which forms dinuclear rhodium and palladium complexes while 13-aza-3,7-dithiabicyclo[7.3.1]trideca-1 (13),9,11-triene yields an unusual dimeric rhodium carbonyl complex exhibiting fluxional behaviour in solution, which has been monitored by ¹H and ¹³C n.m.r. spectroscopy.