ISOLATION AND COMPLEXATION OF THE CIS ISOMER OF THE PENDANT ARM MACROCYCLE 6,13-DIMETHYL-1,4,8,11-TETRAAZACYCLOTETRADECANE-6,13-DIAMINE

The cis isomer of the pendant arm macrocyclic hexaamine 6,13-dimethyl-1,4,8,11-tetraazacyclotetradecane-6,13-diamine (L2) has been isolated for the first time. The ligand has been complexed with cadmium(II) and characterised structurally. The complex [CdL2][ClO4]2 crystallises in the monoclinic space group P2(1)/n, a = 10.238(1), b = 16.445(2), c = 13.106(2) angstrom, beta = 103.33(1)-degrees, and Z = 4. The Cd-N bond lengths are not unusual by comparison with those exhibited by typical CdN62+ complexes, compared with the generally short M-N bond lengths that have been observed in sexidentate co-ordinated complexes of the trans isomer L1. Reaction of L1 with cadmium(II) does not yield a hexaamine complex, instead the pendant primary amines are not co-ordinated and the four secondary amines encircle the metal centre.