Effects of cations upon absorption spectra. Part 1.—Tetrahedral bromo and iodo complexes of nickel(II) in acetone
- 1 January 1969
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Transactions of the Faraday Society
- Vol. 65, 1427-1434
- https://doi.org/10.1039/tf9696501427
Abstract
The formation of the tetrahedral complexes [NiBr3(solvent)]–, NiBr2– 4, [NiI3(solvent)]– and NiI2– 4 in acetone in the presence of the bromides and iodides of lithium and various quaternary ammonium cations has been investigated. The tri-halogeno species is unaffected by the counter ion but the extent of formation of the tetra-halogeno species is dependent upon the size of the counter ion: the results with lithium are anomalous. The data is interpreted in terms of the presence of the solvent-shared ion pair [NiX4(solvent)R4N]–. An explanation of the lithium results is given. In solutions containing only nickel, bromide and the counter ion, and at Br/Ni mole ratios in excess of 3 the two species equilibrium tri tetra is established; when perchlorate is also present at least one octahedral species is always evident.Keywords
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