Download Advances in Inorganic Chemistry, Vol. 41 by A. G. Sykes PDF
By A. G. Sykes
Advances in Inorganic Chemistry offers well timed and informative summaries of the present growth in quite a few topic parts inside of inorganic chemistry starting from bio-inorganic to sturdy country reviews. Thisacclaimed serial positive aspects studies written by way of specialists within the region and is an fundamental connection with complicated researchers. every one quantity of Advances in Inorganic Chemistry comprises an index, and every bankruptcy is totally referenced.
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Additional info for Advances in Inorganic Chemistry, Vol. 41
The trigonal prismatic cluster chlorides readily undergo substitution by bromide in HBr at -140°C, with the preservation of the Tc framework. The reaction goes to completion and no mixed-ligand clusters can be isolated. In acetone, [H(H,O),l,[Tc,Br,(p-Br)JBr, undergoes partial substitution with HI at room temperature. 5~~]Iz (179). X-ray photoelectron spectra (180),magnetic properties, and EPR studies of the Tc clusters have been reported and the mechanism of Tc-Tc bond formation has been discussed (1811.
HCl to [TcC1,I2-. 08(1)8, (208,209). HC1 to a previously heated 99"Tc0,-/HC1 solution and may be extracted by CH,Cl, after the addition of NBu,Cl (210). 1- (14) (15) The AsPh,[Tc(NS)X,I (X = C1, Br) salts are prepared by the reaction of (ASP~,)~[TCX~I with (NSCl), and AsPh,[Tc(NS)(NCS),I is prepared by ligand exchange. In the case of [TcBr,12-, mixed-ligand complexes [Tc(NS)Cl,Br,-,l- ( n = 1-31 are formed and the addition of HBr is required to effect full substitution and to give red-brown crystals of AsPh,[Tc(NS)Br,].
With appropriate ligands Tc(II1) is water- and air-stable, and cationic complexes with bidentate phosphine and arsine ligands have been extensively studied in the search for myocardial imaging agents. A notable feature is that nearly all the seven-coordinate Tc complexes are found in this oxidation state. This is understandable in terms of the d4 electronic configuration of Tc(III), which requires seven singly bonded ligands to achieve an 18-electron count. A. CARBONYL COMPLEXES Yellow plates of the seven-coordinate [TcC1,(CO)(PMe2Ph),1~EtOH are formed by passing CO at atmospheric pressure through a refluxing solution of rner-[TcCl3(PMe2Ph),1in ethanol.