Inorganic Chemistry, Vol.54, No.18, 8881-8883, 2015
Chiral Scrambling and Independent Crystallization of D-4, L-4, and D2L2 Isomers of an (Au4Co2III)-Co-I Hexanuclear Complex with Mixed Penicillaminate and Bis(diphenylphosphino)ethane
The 1:1 mixing of a pair of enantiomers of a cyclic (Au4Co2III)-Co-I hexanuclear complex having penicillaminate,(pen) and 1,2-bis(diphenylphosphino)ethane (dppe), [Au4Co2(dppe)(2)(D-pen)(4)](2+) (D-4-[1](2+)) and [Au4Co2(dppe)(2)(L-pen)(4)](2+) (L-4-[1](2+)), in solution produced an additional stereoisomer, [Au4Co2(dppe)(2)(D-pen)(2)(L-pen)(2)](2+) (D2L2-[1](2+)), because of the scrambling of [Co (D-pen)(2)](-) and [Co(L-pen)(2)](-) units between D-4-[1](2+) and L-4-[1](2+). Upon crystallization with NO3-, the three stereoisomers were independently crystallized to form three different kinds of crystals, homochiral crystals of D-4-[1](NO3)(2), homo chiral crystals of L-4-[1](NO3)(2), and heterochiral crystals of D2D2-[1] (NO3)(2), showing a unique example of the self-recognition and organization of three stereoisomers upon crystallization.