The structure of Zn(CN)2has been reexamined using neutron time-of-flight diffraction and has been determined to have symmetryPn3m,a=5.9227 (1) Å at 14 K and 5.8917 (1) Å at 305 K (negative thermal "expansion"). The CN groups are disordered in contrast to the ordered arrangement with symmetryP43massumed in earlier X-ray diffraction experiments. Zn is tetrahedrally surrounded with average Zn-(C, N)=1.9697(3) and C-N=1.1897(1) Å. Ga(CN)3has been examined for the first time. X-ray powder diffraction shows it to have a cubic Prussian blue framework structure, symmetryPm3m,a=5.295(2) Å, also with CN disorder. Ga is octahedrally surrounded with average Ga-(C, N) distance=2.072(2) Å and C-N=1.148(1) Å.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Ceramics and Composites
- Condensed Matter Physics
- Physical and Theoretical Chemistry
- Inorganic Chemistry
- Materials Chemistry