Advances in Inorganic Chemistry, Vol. 52 by AG Sykes

By AG Sykes

Advances in Inorganic Chemistry offers well timed and informative summaries of the present growth in various topic parts inside inorganic chemistry, starting from bioinorganic to stable nation. This acclaimed serial positive factors reports written by way of specialists within the quarter and is an fundamental connection with complicated researchers. each one quantity of Advances in Inorganic Chemistry comprises an index, and every bankruptcy is totally referenced.

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Example text

The four Fe(III) sites are assigned as the four metal sites trans to the shared edge of a decametallate core. Magnetic studies show t h a t 68 has a diamagnetic ground state. A mixed-valent heptadecanuclear iron cage has also been reported by this group, as part of a series of general formula [Fe16MOlo(OH)1o (OuCPh)2o] (M = Fe, Mn or Co) (160); the cage with M = Fe(II) is shown in Fig. 27. These cages are formed in low yield from reactions of the mixed-valent triangle [Fe30(O2CPh)6(H20)2(MeCN)]; the {Fe17} cage results from hydrolysis of a solution of the triangle in MeCN (with some 67 also found), while the cages containing Mn or Co involved reaction with suitable metal salts prior to crystallization.

The structure of [FeloNa206(OH)4(O2CPh)lo(chp)6(H20)2(Me2CO)2] (155). ) variable t e m p e r a t u r e magnetic data difficult; however, Cano et al. have recently reported Monte Carlo studies t h a t allow exchange parameters to be calculated (11). c. 3 K to reorientation of the magnetization (11). The first undecanuclear iron cage, [FellO6(OH)6(O2CPh)15] (67), shown in Fig. 26, was also reported by the Lippard group (158). It is formed by controlled slow hydrolysis of a solution containing [Fe2OC16]2- and Na(O2CPh) in MeCN.

Magnetization studies suggest an S -- 6 ground state. The oldest octanuclear Fe(III) cage is also the iron cage with the most heavily studied magnetic properties. [Fes(O)2(OH)12(tacn)6] s+ (58) (tacn -- 1, 4,7-triazacyclononane), shown in Fig. 23, was first reported FIG. 23. The structure of [Fe8(O)2(OH)12(tacn)6]s+ (145). ) HIGH-NUCLEARITY 3d-METAL COMPLEXES 53 by Wieghardt and co-workers in 1984 (145). The cage was made by hydrolysis of[FeC13(tacn)] at pH 9 in the presence of bromide. The structure consists of a planar octanuclear iron core, bridged by two tt3-oxides and twelve t~2-hydroxides.

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