Abstract
The addition of ethylenediamine to an acetonitrile solution of [Ni( N- meso-L 1)](ClO 4) 2 L 1 = 3,4-dimethyl-2,6,13,17-tetraazacyclo-[16.4.0. 1.18.0 7.12]docosa-2,13,-diene) produced the N- racemic isomer [Ni( N- racemic-L 1)](ClO 4) 2·H 2O. The electronic absorption spectrum of the N- racemic isomer in nitromethane solution showed that the wavelength and the molar absorption coefficient are much longer and larger, respectively, than those of the N- meso isomer and other related 14-membered tetraaza macrocyclic complexes. The axial coordination of solvent molecules such as DMF and MeCN is much easier to the N- racemic isomer than to the N- meso isomer. [Ni( N- racemic-L 1)](ClO 4) 2·H 2O belongs to the space group Cc (No. 9) with a = 19.706(1), b = 11.651(1), c = 12.281(1) A ̊ and β = 111.98(2)° . The structure showed that the complex has a somewhat distorted square-planar geometry.
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