Transition metal--interactions

A number of transition metal-alkyl complexes, where the alkyl group may be ethyl, n-propyl or iso-propyl, react with the triphenylmethyl cation forming ethylenic cations, e.g. 

The formation of the 2-deuteropropene cation, 7.4, from the 2-iso-propyl complex, 7.5, as shown above, confirms that the hydride is abstracted from a /S-carbon. 

Reactions which appear to be closely related are the reversible exchange of hydrogen in some ruthenium-aryls and in some ruthenium-alkyl phosphine complexes (see p. 232). They may be represented as follows  

Similarly, the thermal decomposition of the ethyl complex trans-(Et3P)2PtCH2CH3Cl to the hydride lmnJ-(Et3P)2PtHCl and ethylene may proceed via the internal abstraction of a hydrogen from the /S-carbon, viz. 

During the course of all these reactions it seems reasonable that there is some interaction between the metal and the /S-substituents. 

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Strong boron-transition metal interaction interatomic distances are shorter by 5-10%, as compared to the sum of the metal radii. 

Drakova, D., Doyen. G., and Trentini, F. V. (1985). Self-consistent calculations of rare-gas-transition-metal interaction potentials. Phys. Rev. B 32, 6399-6423. 

Cp2Ti(PMe3)2]+[Fl2B(C6F5)2], 52 illustrating the high ionic character of the hydrido-borate-early transition metal interaction in these compounds. 

The knowledge of the chemistry and structure of nucleic acids as well as their metabolic and catabolic pathways has been extensively increased. However, there is very little evidence about the role of transition elements in the biochemistry of nucleic acids. Therefore, this review should emphasize the present status of the literature about studies of transition metal interactions with the monomer and polymer units of nucleic acids. Although this survey is far from being comprehensive it is hoped that the data collected here will be helpful for further investigations on the biochemical behavior of transition metals in nucleic acid metabolism. 

This has been demonstrated for bis(TC-allyl) nickel, where the current approach provides a detailed understanding of the ligand-transition metal interactions (in the form of Ni-d to aUyl-7C donation and allyl-7C to Ni-p backdonation) as well as a quantitative... 

Goryachev Yu. M., Dekhteruk V. I. et al. Electron mechanism of baric depedences of hydrogen - transition metal interaction. Proceedings of the Conference on hydrides and frillerenes, Kyiv - Yalta, IPMS NASU, 1999, 11 - 12. 

Platinum appears to be the metal offering the optimum interaction energies for adsorption and catalysis of hydrocarbons. The other transition metals interact more strongly with hydrocarbons, leading to higher rates for hydrogenolysis and conse-... 

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