Organometallic Compounds Containing a Guanidinium Group. Crystal and Molecular Structure of (Creatinine)phenylmercury(II) Nitrate Monohydrate

We have determined the structure of [PhHg(C4H7N30)][N03].H20. The crystal is made up of [PhHgNC(NH2)(Me)CH2CO]+ cations containing the phenylmercury group bonded to the ring N atom, nitrate ions, and water molecules. The creatinine and phenyl rings in the cation are almost coplanar, and the cations are stacked with phenyl and creatinine rings of adjacent ions almost parallel and 3,372 A apart. Bond lengths within the creatinine ring indicate delocalization of the carbonyl C(1)O with the guanidinium moiety as the C(1)-N(3) distance, 1,38 (4) A, is appropriate for multiple-bond character.