Copper(I) halide complexes with 2,2′-bis(diphenylphosphano)-1,1′-binaphthyl (rac-binap) and heterocyclic thiones. Racemic compounds in chiral and achiral crystal space groups
摘要:
Reactions of copper(I) halides with racemic 2,2'-bis(diphenylphosphano)-1,1'-binaphthyl (rac-binap) in 1:1 molar ratio afforded mononuclear complexes of the type [CuX(rac-binap)] (X = Cl, Br, I) which, on further treatment with 1 equiv. of pyridine-2-thione (py2SH), pyrimidine-2-thione (pymtH) or 4,6-dimethyl-pyrimidine-2-thione (dmpymtH) gave rise to the formation of mixed-ligand complexes of the formula [CuX(rac-binap)(thione)]. The molecular structures of [CuBr(rac-binap)(py2SH)] center dot 2CH(2)Cl(2), [CuBr(rac-binap)(py2SH)] center dot CH2Cl2 and [CuBr(rac-binap)(dmpymtH)] center dot CH2O2 have been established by single-crystal X-ray diffraction. Each of the complexes features a distorted tetrahedral copper(l) center with the phosphane acting in a chelating fashion. The complexes are strongly luminescent in the solid state at ambient temperature. Unusually, the [CuBr(rac-binap)(py2SH)] center dot 2CH(2)Cl(2) molecules crystallise in a chiral space group with independent S- and R-enantiomers in the asymmetric unit. (c) 2008 Elsevier Ltd. All rights reserved.