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Tetraazacyclo[14]anuulene complexes have been interested due to usefulness as model compounds for largely the interaction between substrates and metal centers in biological systems such as hemoproteins and metalloenzymes. The reactions of tetraazacyclo[14]annulenenickel(II) complexes with electrophiles such as perfluorobenzoyl, azobenzene and benzoyl groups are also studied. The aim of introducing these substituents to the macrocycle compounds is to prepare new compounds with additional active functional groups. In previous papers, we reported several crystal structures and electroproperties of asymmetrical tetraazacyclo[14]annulenenickel(II) complexes, their catalytic activities for the oxidation of styrene derivatives, substituent effects on the reaction of the complexes with benzoyl chloride derivatives, and synthesis of free ligands such as tetraazacyclo[14]tetradecines by demetallation. In this study, we report the synthesis and characterization of new asymmetrical tetraazacyclo[14]annulenenickel(II) complexes, 1 and 2 (Scheme 1) and the structural characteristics of the complex 2 using X-ray diffraction analysis.

Synthesis and Structure of 3,10-Di(p-chlorobenzoyl)-4,9-dimethyl-2,11-diphenyl-1,5,8,12-monobenzotetraazacyclo[14]annulenenickel(II)