STRUCTURES OF RACEMIC AND MESO (5,7,7,12,14,14-HEXAMETHYL-1,4,8,11-TETRAAZACYCLOTETRADECA-4,11-DIENE)NICKEL(II) PERCHLORATE

The crystal structures of racemic and meso (5,7,7,12,14,14-hexamethyl-1,4,8,11-tetraazacyclo-tetradeca-4,11-diene)nickel(II) perchlorate, [Ni-(C16H32N4)](ClO4)2, M(r) = 538.06, are reported at 295 K with Mo Kalpha radiation (lambda = 0.71069 angstrom). The d and l isomers cocrystallize to form the racemic structure in the orthorhombic space group Pbca with a = 19.759 (3), b = 17.016 (3), c = 13.661 (3) angstrom, V = 4593 (2) angstrom3, Z = 8, D(x) = 1.556 g cm-3, mu = 11.2 cm-1, F(000) = 2256 and refined to R = 0.051 for 2245 reflections with F(o) > 3sigma(F(o)). The meso isomer crystallized in the monoclinic space group P2(1)/c with a = 10.257 (3), b = 10.742 (2), c = 10.885 (2) angstrom, beta = 111.46 (2)-degrees, V = 11116.2 (9) angstrom3, Z = 2, D(x) = 1.601 g cm-3, mu = 11.6 cm-1, F(000) = 564 and refined to R = 0.042 for 2155 reflections with F(o) > 3sigma(F(o)). The values of the Ni-N(amine) and Ni-N(imine) bond lengths are 1.915 (4) and 1.884 (5) angstrom for the racemic structure and 1.938 (2) and 1.907 (2) angstrom for the meso isomer.