Preprint Article Version 1 This version is not peer-reviewed

Ni(NH3)2(NO3)2 – A 3-D Network Through Bridging Nitrate Units Isolated from the Thermal Decomposition of Nickel Hexammine Dinitrate

Version 1 : Received: 14 May 2018 / Approved: 15 May 2018 / Online: 15 May 2018 (06:33:41 CEST)

A peer-reviewed article of this Preprint also exists.

Breternitz, J.; Godula-Jopek, A.; Gregory, D.H. Ni(NH3)2(NO3)2—A 3-D Network through Bridging Nitrate Units Isolated from the Thermal Decomposition of Nickel Hexammine Dinitrate. Inorganics 2018, 6, 59. Breternitz, J.; Godula-Jopek, A.; Gregory, D.H. Ni(NH3)2(NO3)2—A 3-D Network through Bridging Nitrate Units Isolated from the Thermal Decomposition of Nickel Hexammine Dinitrate. Inorganics 2018, 6, 59.

Journal reference: Inorganics 2018, 6, 59
DOI: 10.3390/inorganics6020059

Abstract

Nickel nitrate diammine, Ni(NH3)2(NO3)2, can be synthesised from the thermal decomposition of the nickel nitrate hexammine, Ni[(NH3)6](NO3)2. The hexammine decomposes in 2 distinct steps; the first releases 4 equivalents of ammonia while the second involves the release of NOx, N2 and H2O to yield NiO. The intermediate diammine compound can be isolated following the first deammoniation step or synthesised as a single phase from the hexammine under vacuum. Powder X-ray diffraction (PXD) experiments have allowed the structure of Ni(NH3)2(NO3)2 to be solved for the first time. The compound crystallises in orthorhombic space group Pca21 (a = 11.0628 (5) Å, b = 6.0454 (3) Å, c = 9.3526 (4) Å; Z = 4) and contains 11 non-hydrogen atoms in the asymmetric unit. Fourier Transform Infrared (FTIR) spectroscopy demonstrates that the bonding in the ammine is consistent with the structure determined by PXD.

Subject Areas

crystal structure; ammine complex; structure determination; ammonia storage; vibrational spectroscopy

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