The Crystal Structure of Bis(succinonitrilo)copper(I) Nitrate

Abstract

The crystal structure of bis(succinonitrilo) copper(I) nitrate has been determined by two dimensional Fourier method. It is monoclinic P2⁄a with two formula units in a cell of dimensions: a=11.62±0.03 Å, b=5.31±0.01 Å, c=9.53±0.03 Å and β=98.8°±0.2°. The crystal consists of nitrate ions and polymeric chains of the following composition:(Remark: Graphics omitted.)These chains run parallel to the a-axis-A succinonitrile molecule takes a gauche form with respect to the central C2–C3 bond. A copper atom is surrounded tetrahedrally by four nitrogen atoms with Cu–N distances of 1.96 and 2.02 Å. These facts are in close agreement with infrared spectral observations.All the atoms in the group Cu–N–C–C lie almost on a straight line. This fact and the observed C–N distance of 1.14 Å suggest that the bond character in the C–N group may essentially be expressed as C≡N.