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Abstract
Baeyer-VillThis review covers twenty eight monomeric Pt(η2-P2L)X2 (X = Br or I) derivatives. These complexes exist in cis- as well as trans-configurations from which the complexes with cis-configuration are more common. The organodiphosphines create wide varieties of the metallocyclic rings PNP, PC2P, PC3P, PNCNP and PC4OC4P. The mean values of Pt-L bond distances in cis-complexes are: 2.230 A (P), 2.490 A (Br) and 2.240 A (P) 2.666A (I), respectively. In the trans-complexes the values are 2.319 A (P), 2.429 A (Br) and 2.320 A (P), 2.615 A (I). The Pt-X bond distances in the cis- as well as in the trans-derivatives elongate with the covalent radius of the X atom. In addition in the cis-derivatives the Pt-X bond distances are longer than those in trans-derivatives, as a reason of higher trans-influence of P over the respective halogens. Some of the complexes are examples of distortion isomerism. Finally, the structural data of Pt(η2-P2L)X2 (X = Br or I) are compared with the values of Pt(η2-P2L)X2, complex and discussed.
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