Creation of Optically Pure Crystals from a Meso-Type Gold(I) Metalloligand with d- and l-Amino Acids: A Coordination Trick.

A unique example of a coordination system that creates optically pure crystals from a meso compound with d- and l-amino acids is reported. The 1:1 reaction of a newly prepared meso digold(I) complex, [Au (dcpe)(d-Hpen)(l-Hpen)] ([H 1]), with Co(OAc) under aerobic conditions yielded a cationic Au Co trinuclear complex, [Au Co(dcpe)(d-pen)(l-pen)] [2] , in which [1] acts as a hexadentate-N ,O ,S metalloligand to a Co center. Similar reactions with M(OAc) (M=Ni and Zn) produced analogous but neutral Au M complexes, [Au M(dcpe)(d-pen)(l-pen)] ([3 ]).

Bis[μ-1,3-bis-(di-phenyl-phosphan-yl)propane-κ(2) P:P']digold(I) tetra-chloridonickelate(II) diethyl ether monosolvate.

The title compound, [Au2(C27H26P2)2][NiCl4]·C4H10O, consists of a digold(I) complex cation, an [NiCl4](2-) complex anion and a diethyl ether solvent mol-ecule. Two 1,3-bis-(di-phenyl-phosphan-yl)propane (dppp) ligands bridge two Au(I) atoms, forming a metallacycle in which each of the Au(I) atoms is coordinated in a slightly distorted linear environment by two P atoms. In the complex anion, the Ni(II) atom is coordinated by four chloride ligands in a distorted tetra-hedral geometry.