Crystal and molecular structure of cis-diphenylbis-(2,2′-bipyridyl)-chromium(III) iodide

Abstract

Crystals of the title compound are monoclinic, space group C2/c, with cell dimensions a= 11·034, b= 16·021, c= 16·183 Å, β= 103° 31′, Z= 4. The final R for 2227 counter data refined by a block-diagonal least-squares method is 0·054. The organometallic cation, which has the cis-octahedral configuration, possesses a crystallographic two-fold symmetry axis. The chromium–carbon σ bond length [2·087(4)Å] is no different from the corresponding length in the cis-[(2-methoxyphenyl)₂Cr(bipy)₂]⁺(bipy = 2,2′-bipyridyl) cation. The chromium–nitrogen bonds which are not related by the two-fold symmetry axis have different lengths; those trans to nitrogen [2·087(4)] being shorter than those trans to carbon [2·147 (4)Å].