Dinuclear metal complex rhenium

The present volume is the fourth in the series and covers the topics lithium in biology, the structure and function of ceruloplasmin, rhenium complexes in nuclear medicine, the anti-HIV activity of macrocyclic polyamines and their metal complexes, platinum anticancer dmgs, and functional model complexes for dinuclear phosphoesterase enzymes. The production of this volume has been overshadowed by a very sad event—the passing away of the senior editor, Professor Robert W. Hay. It was he who conceived the idea of producing this series and who more than anyone else has been responsible for its continuation. A tribute by one of his many friends, Dr. David Richens, is included in this Volume. 

Chloride ion catalyses the reaction and has an effect on the final product which is considered to be a dinuclear Ti -Re complex. It is of interest that on preparation of rhenium(v) and reaction with Ti ", there is an instantaneous reduction to yield the same dinuclear product. The use of non-aqueous media for investigating electron-transfer reactions is increasing and a review of solvent effects of systems involving metal complexes in homogeneous and heterogeneous phases has recently been published. ... 

Progress in rhenium chemistry reported in 1991 is reviewed.549 There is much important material in a review of methyltrioxorhenium catalysed alkene metathesis, oxidation and aldehyde alkenation, a review of the insertion of activated alkynes into the metal-metal bond of dinuclear manganese and rhenium carbonyl complexes. i a review of the reactions of [Cp(CO)2Mn=CPh]+ towards electron rich alkynes and nitriles552 and a review of the discovery of tRe(CBu )(CHBu ) OCMe(CF3)2 2l and recent results covering the metathesis of alkenes. s... 

A review was published on the chemistry of dinuclear dppm ( A-frame ) complexes.Many examples of oxidative addition and reductive elimination are included. Formal oxidative addition of a variety of unactivated alkanes has been achieved using metal atom chemistry with rhenium and benzene, producing compounds of structure (47).Mixtures of isomers obtained pointed toward steric control for bond cleavage. 

In halocarbon solution, dinuclear complexes of manganese and rhenium are transformed to mixed halogenated complexes (Fig. 24). With respect to silent conditions, the rate enhancement is estimated at 10 . The vapor pressure of the starting material is very low as compared to that of the solvent, and its concentration in the bubble should be low. According to the authors, the metal-metal bond cleavage is unlikely despite its weakness, and the first reaction step is probably the solvent sonolysis. 

Dinuclear complexes in which the two metal atoms are bridged by polyyne, unsaturated elemental carbon chains (15-17), have received considerable attention due to their unique properties. For example, upon oxidation, these complexes form metallacumulenes of the general formula [L M=(C=C)p=ML ] +, where L includes pentamethyl-cyclopentadienyl, [Cp, C5(CH3)5], triarylphosphine, [Ar3 , Ar = Ph, C6H5, and Tol, P-CH3C6H4], aryl, CO, and NO. With the fragment [C5(CH3)5]Re(NO)[P (05115)3] as the capping, complex molecules with chains containing up to 20 carbon atoms have been synthesized. For compound 17 a rhenium-rhenium distance of 2.87 nm was estimated. These complexes can be considered the first step toward metal-capped, one-dimensional carbon allotropes. 

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