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

Abstract The crystal structure of bis (glutaro-nitrilo) copper (I) nitrate has been determined by the two-dimensional Fourier method. It is tetragonal P421c with two formula units in a cell of dimensions: a=8. 25±0. 01 Å and c=9. 71±0. 01 Å. The crystal consists of infinite two-dimensional networks of complex ion Cu (NC–CH2–CH2–CH2–CN) 2nn+ and nitrate ions. A copper atom is tetrahedrally surrounded by four nitrogen atoms at a distance of 1. 98 Å. Each glutaronitrile molecule is coordinated to two different copper atoms with nitrogen atoms at both ends and takes a gauche-gauche configuration with respect to the two C–C bonds. The nitrate ions lie perpendicularly to the c-axis. The trigonal nitrate ions seem to have statistical azimuthal orientations in the crystal and the apparent symmetry of the nitrate ion is 4. All the atoms in the group Cu–N–C–C lie approximately on a straight line. This fact and the observed carbon-nitrogen distance of 1. 14 Å suggest that the bond character in the carbon-nitrogen group may essentially be expressed as C≡N.