Reaction of [Ni(H2O)6](NO3)2 with gaseous NH3; crystal growth via in-situ solvation

Joachim Breternitz, Louis J. Farrugia, Agata Godula-Jopek, Sina Saremi-Yarahmadi, Iwona E. Malka, Tuan K.A. Hoang, Duncan H. Gregory

Research output: Contribution to journalArticle

Abstract

Traditional techniques for the growth of crystals are typically lengthy and are based on the slow over-saturation of either solutions or melts. By contrast, the reactions of solids at moderate temperatures and pressures normally lead to the formation of powders of small crystallites. In this paper, we present a new and effective method to grow crystals of surprisingly large sizes (up to ca. 0.05 mm in the largest dimension). We use the reaction of [Ni(H2O)6](NO3)2 with NH3(g) at room temperature to create macrocrystals of [Ni(NH3)6](NO3)2. The synthesis proceeds via simple ligand exchange and crystal growth is facilitated in-situ via the solvent effect of the released water. The nitrate ammine product was characterised by powder X-ray diffraction (PXD) and Scanning Electron Microscopy (SEM). This reaction is important since it demonstrates that aquo complexes can undergo facile ligand exchange with gaseous ammonia under realistic conditions for ammonia storage. The single crystal structure of [Ni(H2O)6] (NO3)2 was determined for the first time below ambient temperature (at 100 K). The latter result offers no evidence to support a previously postulated low temperature phase-transformation at 100≤T/K≤295.

Original languageEnglish
Pages (from-to)1-6
Number of pages6
JournalJournal of Crystal Growth
Volume412
DOIs
Publication statusPublished - Feb 15 2015
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Inorganic Chemistry
  • Materials Chemistry

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    Breternitz, J., Farrugia, L. J., Godula-Jopek, A., Saremi-Yarahmadi, S., Malka, I. E., Hoang, T. K. A., & Gregory, D. H. (2015). Reaction of [Ni(H2O)6](NO3)2 with gaseous NH3; crystal growth via in-situ solvation. Journal of Crystal Growth, 412, 1-6. https://doi.org/10.1016/j.jcrysgro.2014.11.021