Crystal and molecular structure of bis(N,N-di-n-butyldithiocarbamato)gold(III) dibromoargentate(I)

The crystal and molecular structure of bis(N,N-di-n-butyldithiocarbamato)gold(III)dibromoargentate(I), Au(S₂CN(C₄H₉)₂)₂AgBr₂, has been determined by three-dimensional X-ray methods. The compound crystallizes in the monoclinic space groupC2/c with unit cell dimensions:a= 17·39(1)b = 18·65(1);c = 9·199(6) Å; = 93·9(1)°;Z=4. Intensities were collected on an automatic diffractometer. The structural parameters were refined by least-squares methods to a conventionalR factor of 0·048 for 854 non-zero observed reflexions. The structure consists of Au(S₂CN(C₄H₉)₂)2⁺ and AgBr₂^– ions. The gold is in planar coordination with four sulphur atoms, the two crystallographically non-equivalent Au-S bond lengths being 2·357(8) and 2·324(8) Å. The silver is linearly coordinated, the Ag-Br bond lengths being 2·450(5) Å. The ionic packing in the structure differs from that in the analogous Au(S₂CN(C₄H₉)₂)₂AuBr₂ complex.The authors are grateful to Professor J. J. Steggerda for his continuous interest and to Mr. W. P. J. Bosman and Mr J. M. M. Smits for valuable assistance. Authors of contributions from the Department of Inorganic Chemistry and Crystallography of this University will no longer be listed in alphabetical order.