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Metal distribution and disorder in the crystal structure of [NH2Et2][Cr7MF8((t)BuCO2)16] wheel molecules for M = Mn, Fe, Co, Ni, Cu, Zn and Cd.

Authors
  • Larsen, Finn Krebs
  • Overgaard, Jacob
  • Christensen, Mogens
  • McIntyre, Garry James
  • Timco, Grigore
  • Winpenny, Richard E P
Type
Published Article
Journal
Acta crystallographica Section B, Structural science, crystal engineering and materials
Publication Date
Dec 01, 2014
Volume
70
Issue
Pt 6
Pages
932–941
Identifiers
DOI: 10.1107/S2052520614019179
PMID: 25449616
Source
Medline
Keywords
License
Unknown

Abstract

The homometallic wheel compound [Cr8F8(O2CCMe3)16] formed with fluorine and pivalic acid ligands can be modified by introducing in the synthesis process a divalent cation M capable of octahedral coordination instead of one of the trivalent Cr centres in the ring. Heterometallic mono-anionic species [Cr7MF8(O2CCMe3)16](-) can form diethylammonium salts and be crystallized from ethylacetate solution as compounds with the general formula [NH2Et2][Cr7MF8((t)BuCO2)16][C4H8O2]0.5 for M = Mn, Fe, Co, Ni, Cu, Zn and Cd. Their structures are isomorphous, belonging to the space group P21/c. The study has determined the degree of order for the individual M heterometal over the possible metal positions of the ring in the crystal structure by modelling based on X-ray diffraction data. The model took into account disorder in tert-butyl groups of the pivalate ligands and in the position and orientation of the ethylacetate solvent molecule. The heterometal turned out to be partly ordered in the crystal structure.

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