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Durham e-Theses
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The determination of the crystal structure of diammonium vanadyl oxalate dihydrate

Oughtred, R. E. (1973) The determination of the crystal structure of diammonium vanadyl oxalate dihydrate. Masters thesis, Durham University.

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Abstract

The development of the structural chemistry of oxalates and vanadyl complexes is reviewed. The structure of diammonlum vanadyl oxalate dihydrate has been determined by x-ray analysis, using photographic and counter methods of data collection. The counter method gave an R factor of 0.039 and produced atomic coordinates with a satisfactory degree of accuracy. Contrary to predictions based on spectroscopic evidence, the vanadium atom is six coordinate, the anion [V0 (C(_2)O(_4))(_2)H(_2)0](^2-) containing a distorted octahedral arrangement of oxygens about the metal atom. The two chelated oxalate groups have a cis arrangement with respect to one another and a water molecule occupies an apical position trans to the vanadyl group. A comparison of vanadium to oxygen bond lengths with corresponding vanadium to ligand distances in other octahedralvanadyl complexes, shows that there is a general agreement. The bond lengths in the oxalate groups also agree with those in similar structures. The effect of the V = 0 group on C - 0 bond lengths in the trans chelated oxalate group has been observed and this accords with results reported by other workers. The water molecules and ammonium ions generate a network of hydrogen bonds in which all the oxygen atoms are involved.

Item Type:Thesis (Masters)
Award:Master of Science
Thesis Date:1973
Copyright:Copyright of this thesis is held by the author
Deposited On:14 Mar 2014 16:38

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