Manganese complexes bidentate

Synthesis of a Trinuclear Manganese Complex from the Bidentate Ligand... 

Irradiation of manganese azides derived from Mn(III) porphyrin, cyclam, and polyamide complexes represents one of the earliest methods reported for the preparation of nitrido manganese complexes (Eq. (40)) [50], Additional methods have become available for the synthesis of manganese nitrides that utilize ammonia in combination with oxidants such as Cl2, PhIO, NaCIO, and NBS (Eq. (41)) [51-53]. Employing these methods, the manganese nitrides incorporating porphyrin, phath-locyanine, cyclam, salen, and bidentate Schiff base complexes have been documen-... 

The simplest use of manganese is as part of a metal cofactor such as manganese(II) adenosine triphosphate, [Mn(II)ATP2-]. The metal complex is usually found as the bidentate [Mn(II)0,7-ATP2 ] (3, 4) as illustrated in Figure 1. Enzyme specificity for Mg(II), Mn(II), or Ca(II) ATP complexes is dependent on a variety of factors however, once selected, each metal apparently functions in an analogous manner. The metal ion serves two main purposes. First, based on the coordination geometry... 

The rate law and experimentally determined surface characteristics can be combined to determine the mechanism of this environmentally important reaction. The equations describing the amphoteric (acid/base) properties of the solid surfaces have been previously presented in Eqs. (3.47) and (3.48). One interpretation of the second-order dependency of manganese exchange with respect to hydrogen ion is that two surface sites are required to adsorb one dissolved ion, which is known as a bidentate complex of Mn +, on the surface. Thus, two previously adsorbed hydrogen ions exchange places with Mn + in solution, which is denoted by the equilibrium constant /3 ... 

Collins et al. (1999a) found that Hg2+ sorbed to goethite as an iimer-sphere bidentate complex. Cheah et al. (1998) found that Cu " " sorbed to amorphous silica and Y-AI2O3 as monomeric and monodentate iimer-sphere surface complexes. However, bidentate complexes may also form on Y-AI2O3. Using polarized EXAFS, Dahn et al. (2003) determined that Ni " " sorbed to montmorillonite edge sites as an inner-sphere mononuclear surface complex. Inner-sphere surface complexes were observed with XAS for Cr " " adsorption on manganese (Manceau and Charlet, 1992) and iron oxides (Charlet and Manceau, 1992). 

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