Synthesis, vibrational and emission spectra of some copper(I) complexes of3- and 4-benzoylpyridine ligands and X-ray crystal structure of [(4-benzoylpyridine)(2)H](+)center dot I-

The synthesis and characterization of some copper(I) complexes of the type CuLX, where X = Cl, Br, I, CN and SCN, for L = 3-benzoylpyridine and a new red 1:1 copper(I) iodide complex of 4-benzoylpyridine in addition to a yell ow compound; [(4-benzoylpyridine)(2)H] . (1) are described. The IR and Rama n spectral results suggest bridging halide and pseudohalide groups in the 3 -benzoylpyridine complexes and reflect the influence of the protonation of the 4-benzoylpyridine on its vibration frequencies. The yellow complexes di splay emission spectra with lambda(max) in the region 465-580 nm, whereas t he red complex of 4-Bzpy emits at lambda(max) = 631 nm. The X-ray structure determination has shown compound (1) to contain a discrete dimeric cation [(4-benzoylpyridine)(2)H](+) and an iodide anion. In the cation, a centrosy mmetric pair of 4-benzoylpyridine is dimerized via a hydrogen bond of the t ype N...H...N with a short N...N distance of 2.654(11) Angstrom. The iodide ion is located at the origin of the unit cell. (C) 1998 Elsevier Science L td. All rights reserved.