Synthesis and Characterization of. Nickel(II) and Copper(II) Complexes with Schiff Base (1R,2R)-(-)-Diaminocyclohexane-N,N′-bis(3-tert-butyl-5-(4′-benzoic acid)-salicylidene)

Two homochiral metallosalen complexes, Ni(salen) (salen = (1R,2R)-(-)-diaminocyclohexane-N,N'-bis(3-tert-butyl-5-(4'-benzoic acid)-salicylidene) 1 and Cu(salen) 2, have been synthesized and characterized by IR, microanalysis, TGA, powder and single-crystal X-ray crystallography. Both 1 and 2 crystallize in orthorhombic space group P2(1)2(1)2 with Z = 4. For 1, a = 12.082(2), b = 15.447(3), c = 18.784(4) angstrom, V = 3505.7(12) angstrom(3), M-r = 731.50, D-c = 1.386 g/cm(3), mu = 0.606 mm(-1), F(000) = 1544, the final GOOF = 1.043, R = 0.0496 and wR = 0.1248 for 4791 observed reflections with I > 2 sigma(I). For 2, a = 12.181(2), b = 15.501(3), c = 18.877(4) angstrom, V = 3564.3(12) angstrom(3), M-r = 736.33, D-c = 1.372 g/cm(3), mu = 0.665 mm(-1), F(000) = 1548, the final GOOF = 1.062, R = 0.0575 and wR = 0.1508 for 4562 observed reflections with I > 2 sigma(I). The crystal structures of 1 and 2 are isostructural with very similar supramolecular structures. An infinite two-dimensional network is generated by hydrogen bonding interactions and intermolecular)pi center dot center dot center dot pi interactions.