Abstract
Abstract Various copper(I) complexes with monodentate imidazole(im) have been prepared from [Cu(CH3CN)4]X (X=ClO4− and PF6−) in acetone. Their characterization has principally been made by 1H NMR spectroscopy. Binary copper(I) complexes are [Cu(im)2]+ (2) and [Cu(im)3]+ (3), while the monoimidazole complex is a ternary two- or four-coordinate complex (1). In contrast with 2 and 3, quantitative formation of [Cu(im)4]+ (4) does not occur in acetone. Even at [im]/[Cu]<2, 2 forms more preferentially than 1. This is due to the linear structure of 2. 2 and 3 provide stable CO adducts, both of which display complete reversibility. The affinity for CO of 3 is much stronger than that of 2. Pyrazole copper(I) complexes were also prepared and examined as a comparison with imidazole complexes. Monodentate pyrazole hardly gives two- and three-coordinate complexes. This is attributable to its low basicity in contrast with that of imidazole.
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