Dihydroxo-bridged complexes binuclear

Dihydrogen complexes, osmium, 37 3(X)-301 Dihydroxo-bridged complexes acid-base equilibria, 32 108-110 quantitative considerations, 32 115-118 binuclear, 32 66-67 crystallographic data, 32 61, 63 stability complexes, 32 103-104... 

Crystal data for the trinuclear (structure 5) and tetranuclear (structures 6, 7a, and 8) complexes reveal bond distances and angles which are comparable to those observed in the mono- and dihydroxo-bridged binuclear complexes (40, 42, 49, 50, 53, 54, 62, 87). 

The dihydroxo-bridged binuclear complexes are among the most common, structurally well-characterized polynuclear complexes. For symmetrical bidentate nonbridging ligands, LL, the cation (LL)2M(OH)2M(LL)2"+ may exist in three isomeric forms a meso isomer (A,A) with configuration A and A, respectively, at the two metal centers, and a racemic pair of isomers (A,A and A, A) with configuration A or A at each of the two metal centers (cf. Fig. 2). If the bidentate... 

Presence of binuclear, dihydroxo bridged Pd(II) and Pt(II) complexes in solution receives support from crystal structure determinations of cis diamine Pt(II) complexes (12,13). Tri-nuclear complexes with three Pt(II) and three hydroxo bridges also occur in crystals (14,15). 

Binuclear, oxygen-bridged Fe111 complexes have been actively studied in recent years.23 Two types, dihydroxo- and monooxo-bridged ones have been recognized. The former are represented by [Fe(H20)4OH]2, mentioned above and by [Fe(pic)2OH]2 [pic is the anion (25-E-II)]. Neither has been definitively... 

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