Ruthenium tris-chelates

R = Ph) " have been prepared by reaction of blue ruthenium(III) chloride with the corresponding diketone under basic conditions or by ligand exchange with [Ru(acac)3]. The tris chelate complexes of (-t-)-3-acetylcamphor and (-i-)-3-trifluoroacetylcamphor [RUL3], for example, have been prepared by ligand exchange reaction with [Ru(acac)3] in ethyl benzoate at 160°C the diastereomers have been separated by tic on silica and assigned by H NMR studies. For tris complexes of... 

Intramolecular Rearrangements of Tris-chelate Complexes.— Recently there has been considerable attention paid to the stereochemical non-rigidity of tris-chelate complexes and a number of reviews have dealt with the subject. Studies of NN-disubstituted dithiocarbarmato-complexes of the type [M(R R -dtc)8] (R, R = alkyl or aryl) have been extended and the results for intramolecular metal-centre inversion (probably by the Bailar trigonal-twist mechanism) are summarized for ruthenium(m) complexes in Table 29. The low values of AG and are surprising for ruthenium(m) since previous studies indicated that tris-chelates of this... 

Wu, A., et al.. Solid-state light-emitting devices based on the tris-chelated ruthenium(II) complex 3. High efficiency devices via a layer-by-layer molecular-level blending approach. J Amer Chem Soc, 1999. 121(20) p. 4883 891. 

Large cations have a powerful effect on neuromuscular transmission, resulting from acetylcholine esterase inhibition and curariform activity. Examples are quaternary nitrogen, phosphorus and arsenic bases and chelate species such as the tris-(2,2 -bipyridine)iron(II) cation when it is injected intravenously. Bis(2,2, 2"-terpyri-dine)ruthenium(Il) perchlorate has about one tenth of the activity of curare182). 

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