Abstract
OPTICALLY active 1,2-propylenediamine tetraacetic acid1 (H4PDTA) co-ordinates in a completely stereospecific manner2 with Co(III), Rh(III) and Cr(III). Courtauld models of either co-ordinated optical isomer show the methyl group to be sterically hindered for one configuration of the metal complex irrespective of whether the ligand is attached at 4 (non-planar), 5 or 6 points to the metal atom. The absolute stereospecificity of complex formation provides a simple polarimetric method of measuring the exchange-rate of the free ligand with its metal complexes.
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References
Dwyer and Garvan, J. Amer. Chem. Soc., 81, 2955 (1959).
Dwyer and Garvan, J. Amer. Chem. Soc. (in the press).
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BOSNICH, B., DWYER, F. & SARGESON, A. Rate of Ligand Exchange with its Metal Complex by a Polarimetric Method. Nature 186, 966 (1960). https://doi.org/10.1038/186966a0
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DOI: https://doi.org/10.1038/186966a0
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