Pv. Bernhardt, Ni-II and Zn-II complexes of the hexadentate macrocyclic ligand cis-6,13-dimethyl-1,4,8,11-tetraazacyclotetra- decane-6,13-diamine, ACT CRYST C, 56, 2000, pp. 744-746
The title pendent-arm macrocyclic hexaamine ligand binds stereospecifically
in a hexadentate manner, and we report here its isomorphous Ni-II and Zn-I
I complexes (both as perchlorate salts), namely (cis-6,13-dimethyl-1,4,8,11
-tetraazacyclotetradecane-6,13-diamine-kappa(6)N)nickel(II) diperchlorate,
[Ni(C12H30N6)](ClO4)(2), and (cis-6,13-dimethyl-1,4,8,11-tetraazacyclotetra
decane-6,13-diamine-kappa(6)N)zinc(II) diperchlorate, [Zn(C-12 H30N6)](ClO4
)(2). Distortion of the N-M-N valence angles from their ideal octahedral va
lues becomes more pronounced with increasing metal-ion size and the present
results are compared with other structures of this ligand.