Abstract
Complex formation in systems containing 3-carboxypropyltriphenylphosphonium or tetraphenylphosphonium bromide, molecular iodine, and chloroform solution was compared. The maximum number of iodine molecules coordinated by bromides in the solution was established by spectrophotometric method using a function of average iodine number and the stability constants of the complexes were determined. The diiodobromide [(C6H5)4P]BrI2 was studied by X-ray diffraction analysis. The ab initio calculations were performed for [Y(R)4]I3 (Y = N, P, As; R = CH3, C6H5). The obtained experimental data and the correlations with the results of quantum-chemical calculations revealed that the tetraphenylphosphonium cation binds diiodobromide anions through the terminal halogen atoms with equal probability.
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Kazheva, O.N., Aleksandrov, G.G., D'yachenko, O.A. et al. Tetraphenylphosphonium Diiodobromide: Crystal and Molecular Structure. Russian Journal of Coordination Chemistry 30, 739–746 (2004). https://doi.org/10.1023/B:RUCO.0000043901.33628.d5
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DOI: https://doi.org/10.1023/B:RUCO.0000043901.33628.d5