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Read e-book online Advances in Inorganic Chemistry, Vol. 41 PDF

By A. G. Sykes

ISBN-10: 0120236419

ISBN-13: 9780120236411

Advances in Inorganic Chemistry provides well timed and informative summaries of the present development in numerous topic parts inside inorganic chemistry starting from bio-inorganic to strong country reviews. Thisacclaimed serial positive factors studies written by means of specialists within the quarter and is an crucial connection with complicated researchers. each one quantity of Advances in Inorganic Chemistry includes an index, and every bankruptcy is totally referenced.

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The crystal structure of (NBU,)~[TC(NCS)~] shows near-perfect octahedral geomery and establishes that thiocyanate is N-bonded with a n average Tc-N-C angle of 173(2)". * D. AQUA,HALIDE,AND RELATED DIMERIC COMPLEXES No mononuclear Tc(II1) halide is known. 5 bromo ligands, respectively. These results indicate a low affinity of Tc(II1) for halide and the possibility of preparing [ T c ( O H ~ ) ~in] ~a+weakly coordinating aqueous medium (2311, The stability of the mixed-valence [ T C " ' ~ ' ' ~ C ~ ~ ] ~ and the apparent inability to prepare [ T c " ' ~ C ~ ~were I ~ - a puzzle for a number of years in view of the stability of [Re2C1,12- and the only fleeting existence of [RezC1813-(159).

These complexes are generally referred to as BATOs (boronic acid udducts of technetium dioximes) and have the general structure [TcX(dioximeH),(dioxime)BR'](X = C1, Br; R' = alkyl) shown in 18. At the uncapped end the three dioxime oxygen atoms are intramolecularly bonded to two bridging protons. The formation of BATOs from TcO,- and Sn2+ proceeds via several intermediates, including an Sn-monocapped [Tc"'(dioximeH),(p-OH)SnC13],which undergoes acid decomposition to give 34 JOHN BALDAS R the uncapped [Tc"'X(dioximeH),(dioximeHz)] complex.

COMPLEXES WITH SCHIFF BASEAND OTHER NITROGEN LIGANDS A number of Schiff base complexes have been prepared by substitution of [TcCl6I2-or [TcCI,(PP~,)~] (376,269). 7 BM, consistent with a d3 configuration (379). The reaction of [TcOCl,]- with aromatic amines and dppe in refluxing alcohols gives the purple air-stable imido complexes [TcCl(NAr)(dppe),]+ in good yield. Paramagnetism is evident in the broadened NMR spectra. The shows that the hycrystal structure of tr~ns-[TcCl(NNMe~)(dppe)~IPF~ drazido(2-) ligand is bonded as a linear four-electron donor (278).

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Advances in Inorganic Chemistry, Vol. 41 by A. G. Sykes

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