Preparation of RHgCl via transmetalation of (8-quinolyl)SnMe_3 and redistribution to R_2Hg (R = 8-quinolyl): a highly distorted diorganomercury(II) with 84 degree C–Hg–C angle

摘要

Transmetalation occurs upon addition of HgCl_2 to (8-quinolyl)SnMe3 to yield (8-quinolyl)HgCl. The molecule features a frustrated Hg–N Lewis pair; however the mercury(II) center showed low affinity for sulfur Lewis bases, S_8 or thiophene. In the presence of NH_4SCN, ligand redistribution led to R_2Hg. The molecule was found as linear or bent polymorphs, depending on the solvent of recrystallization. The geometry about Hg(II) in the bent polymorph is distorted trigonal prismatic that features a C–Hg–C angle of 84°, weak intramolecular Hg–N contacts, and two intermolecular η~2-quinoline contacts in which the neighboring R_2Hg molecule participates as a bis-η~2-bidentate ligand.