Intermolecular interactions in cyanodimethylarsine and cyanodimethylstibine.
Cyanodimethylarsine, [As(CH(3))(2)(CN)], and cyanodimethylstibine, [Sb(CH(3))(2)(CN)], have closely related, but not isomorphous, crystal structures containing XCN.XCN. chains. The N. As distance of 3.185 (3) A is slightly shorter than the expected van der Waals distance of 3.5 A, while the N.Sb distance of 2.862 (9) A, compared with the expected value of 3.7 A, is much shorter. This is consistent with Sb being a stronger Lewis acid than As.
Britton
Doyle
D
Department of Chemistry, University of Minnesota, Minneapolis, MN 55455-0431, USA. britton@chem.umn.edu
Young
Victor G
VG
Schlemper
Elmer O
EO