Abstract
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 P21/n, a= 10.238(1), b= 16.445(2), c= 13.106(2)A, β= 103.33(1)°, 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.
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