Synthesis and structure determination of Co(HNCN){sub 2} and Ni(HNCN){sub 2}
- Institute of Inorganic Chemistry, RWTH Aachen University, Landoltweg 1, D-52056 Aachen (Germany)
Well-crystallized cobalt and nickel hydrogencyanamide, Co(HNCN){sub 2} and Ni(HNCN){sub 2}, were synthesized from the corresponding ammonia complexes [M(NH{sub 3}){sub 6}]{sup 2+} under aqueous cyanamide conditions. The X-ray and neutron powder data evidence the orthorhombic system and space group Pnnm. The cell parameters for Co(HNCN){sub 2} are a=6.572(1), b=8.805(2), c=3.267(1) A, and Z=2; for the isotypic Ni(HNCN){sub 2}, the cell parameters arrive at a=6.457(1), b=8.768(2), c=3.230(1) A. The octahedral coordinations of the metal ions are marginally squeezed, with interatomic distances of 4xCo-N=2.134(5) A, 2xCo-N=2.122(9) A, and 4xNi-N=2.133(6) A, 2xNi-N=2.035(11) A. The HNCN{sup -} units appear as slightly bent (177.5(2){sup o} for Co(HNCN){sub 2} and 175.7(2){sup o} for Ni(HNCN){sub 2}) and exhibit cyanamide shape character due to triple- and single-bond C-N distances (1.20(2) vs. 1.33(2) A for Co(HNCN){sub 2} and 1.15(2) vs. 1.38(2) A for Ni(HNCN){sub 2}). The infrared vibration data compare well with those of the three existing alkali-metal hydrogencyanamides. - Graphical abstract: Crystal structure of Co(HNCN){sub 2} and Ni(HNCN){sub 2} with Co/Ni atoms as white, N as grey, C as dark-grey, and H as light-grey balls.
- OSTI ID:
- 21015652
- Journal Information:
- Journal of Solid State Chemistry, Vol. 180, Issue 1; Other Information: DOI: 10.1016/j.jssc.2006.10.021; PII: S0022-4596(06)00558-5; Copyright (c) 2006 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0022-4596
- Country of Publication:
- United States
- Language:
- English
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