Abstract
IN 1952 the existence of two thiocyanato-complexes of composition (PPrn3)2Pt2Cl2(SCN)2 was reported1. The labile α-isomer had m.p. 144°–152° and the stable β-isomer, m.p. 173°–174.5°. These isomers have dipole moments of less than 2 Debye units and so must have the tri-n-propylphosphine groups in trans-positions to each other. Possible structures are (I), (II) and (III).
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References
Chatt, J., and Hart, F. A., Nature, 169, 673 (1952).
Penney, W. G., and Sutherland, G. B. B. M., Proc. Roy. Soc., A, 156, 654 (1936).
Langseth, A. L., Nielsen, J. R., and Sørensen, J. O., Z. phys. Chem., B, 27, 100 (1934).
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CHATT, J., DUNCANSON, L. Use of the Infra-Red Spectrum to distinguish Bridging from Terminal Thiocyanato-S-Groups in Co-ordination Compounds. Nature 178, 997–998 (1956). https://doi.org/10.1038/178997a0
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DOI: https://doi.org/10.1038/178997a0
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