Abel, Edward W. ; Beckett, Michael A. ; Orrell, Keith G. ; Šik, Vladimir ; Stephenson, David ; Singh, Harkesh B. ; Sudha, Narasimhan (1988) Interaction of the diphenyldichalcogens, C6H5EEC6H5 (E=S, Se and Te), with the tetrameric halogenotrimethylplatinums. The formation and characterization of [{PtX(CH3)3}2C6H5TeTeC6H5] (X=Br and I) and a dynamic nuclear magnetic resonance study of [{PtI(CH3)3}2C6H5TeTeC6H5] Polyhedron, 7 (13). pp. 1169-1173. ISSN 0277-5387
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Official URL: http://www.sciencedirect.com/science/article/pii/S...
Related URL: http://dx.doi.org/10.1016/S0277-5387(00)81205-X
Abstract
Te2(C6H5)2 undergoes reaction with [{PtX(CH3)3}4] (X=Br, I) in chloroform solution to yield the bimetallic products [{PtX(CH3)3}2{Te2(C6H5) 2}]. These complexes have been characterized by elemental analysis and low temperature multi-element (1H, 13C, 125Te, 195Pt) NMR studies. [{PtCl(CH3)3}4] was unreactive towards Te2(C6H5)2, and similarly Se2(C6H5)2 and S2(C6H5)2 failed to bring about the fission of the tetranuclear [{PtX(CH3)3}4] (X=Cl, Br, I) molecule. [{PtI(CH3)3}2{Te2(C6H5)2 }] was found to be fluxional over the temperature range −20 to +65°C, and a dynamic NMR study of the complex revealed two different modes of fluxionality. The lower energy process has been ascribed to the concerted/correlated double inversion of the coordinated tellurium atoms (ΔG‡=59.7±0.1 kJ mol−1), and the higher energy fluxion (ΔG‡=64.5±0.03 kJ mol−1) is attributed to an intermetallic ligand commutation of the two tellurium atoms between the two platinum atoms, leading to exchange of the three platinum methyl environments.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to Elsevier Science. |
| ID Code: | 47605 |
| Deposited On: | 11 Jul 2011 13:35 |
| Last Modified: | 11 Jul 2011 13:35 |
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