Hexaaza Macrocyclic Metal Complexes Containing Biimidazole. 1. Synthesis and Characterization of Nickel(II), Copper(II), and Palladium(II) Complexes of 2,7-dimethyl-3-6-(1,1′-(2,2′-biimidazolo))-1,3,6,8,11,14- Hexaazacyclohexadeca-1,7-diene
New Ni(II), Cu(II), and Pd(II) metal complexes of the macrocycle 2,7-dimethyl-3-6-(1,1′-(2,2′-biimidazolo))-1,3,6,8,11,14- hexaazacyclohexadeca-1,7-diene have been synthesized and characterized. The Pd(II) complex, which is proposed to contain three 5-membered rings, one 9-membered ring, and two imine linkages, was obtained as an air-stable, insoluble, yellow, diamagnetic compound. Corresponding orange to blue Ni(II) complexes were obtained as the diamagnetic iodide or perchlorate species and paramagnetic chloro and bromo complexes. The Cu(II) complex was obtained as a blue paramagnetic perchlorate complex. FT-IR, NMR, and electronic spectral data have been used to confirm macrocycle formation from metal-trien complexes reacting with 1,1′-diacetyl-substituted 2,2′-biimidazole in water/dioxane or 2-propanol/dioxane mixtures at pH 5. The formation of these amorphous complexes demonstrates how ring formation can be achieved over 1,1′-diacetyl-2,2′-biimidazole hydrolysis due to the metal ion template effect. © 1988 American Chemical Society.
S. S. Kandil and H. L. Collier, "Hexaaza Macrocyclic Metal Complexes Containing Biimidazole. 1. Synthesis and Characterization of Nickel(II), Copper(II), and Palladium(II) Complexes of 2,7-dimethyl-3-6-(1,1′-(2,2′-biimidazolo))-1,3,6,8,11,14- Hexaazacyclohexadeca-1,7-diene," Inorganic Chemistry, American Chemical Society (ACS), Dec 1988.
The definitive version is available at https://doi.org/10.1021/ic00298a009
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© 1988 American Chemical Society (ACS), All rights reserved.