Unknown cis-[(DMSO)₂ClCu^II(μ-Cl)₂Cu^IICl(DMSO)₂] isomer obtained via new [Cu₄Cl₈(DMSO)₈(hmta)] template complex

Abstract

A missed cis isomeric form of a well-known trans-[CuCl₂(DMSO)₂]_n complex has been prepared via the tetranuclear [Cu₄Cl₈(DMSO)₈(hmta)] complex. Structurally, both complexes were found to be molecular i.e. [Cu₄Cl₈(DMSO)₈(hmta)] consists of isolated tetracoordinated hexamethylenetetramine molecules, whereas the cis-complex consists of isolated [(DMSO)₂ClCu^II(μ-Cl)₂Cu^IICl(DMSO)₂] clusters. It should also be noted that the cis-configuration of DMSO molecules in [(DMSO)₂ClCu^II(μ-Cl)₂Cu^IICl(DMSO)₂] was directly transferred from that of [Cu₄Cl₈(DMSO)₈(hmta)], while the trans-[CuCl₂(DMSO)₂]_n isomer was always formed as a final stable product.

Keywords:

• cis-Complex
• template complex
• DMSO complex
• hexamethylenetetramine complex
• direct synthesis

Notes

1. All reactants used in the study were reagent grade quality.

2. All liquids were quantified at 25 °C.

3. CCDC 1028792 and CCDC 1434267 contain the supplementary crystallographic data for this paper. Copies of the data can be obtained free of charge on application from the Director, CCDC, 12 Union Road, Cambridge CB2 1EZ, UK (Fax: int. code +(1223)336–033; E-mail: [email protected]).

4. An assignment of the peaks was done with using of GAMESS program packet [27] as well as comparison with already published Raman and FTIR spectra of DMSO metal halide complexes and NIST spectra library.