Structural studies of metal diselenocarbamates. Crystal and molecular structures of nickel(II), copper(II), and zinc(II) diethyldiselenocarbamates

Abstract

The crystal and molecular structures of nickel(II), copper(II), and zinc(II) diethyldiselenocarbamates have been determined and refined by anisotropic least-squares methods to final R values of 0·076, 0·115, and 0·075 respectively. Isomorphism and isostructurality with the analogous diethyldithiocarbamates permit a significant comparison between the M–Se and C–Se and the corresponding M–S and C–S bond lengths. An average increase of 0·113 Å in the M–Se bond length with respect to that of M–S was found, while C–Se was, on average, longer by 0·152 Å than the C–S bond lengths. These different increases indicate a higher order for the selenium–metal bonds than for the sulphur–metal bonds in the diethyldithiocarbamates.