Ligand MES,

Inversion at the sulfur is also observed with a series of dinuclear Pt complexes with the ligand MeS—CHR—SMe (R = Me, H). However, at higher temperatures a fluxional behavior is encountered where the sulfur atoms obviously swap between the Pt centers.41... 

Figure 14.3 Schematic of (a) a hypothetical mixed ligand [Me(OH)Cl°] complex, and (b) a multidentate nitrilotriacetate chelate of a divalent metal ion in a tetrahedral configuration. (Modified from Benjamin and Honeyman, 2000.)...

Figure 13 Representative early transition metal systems containing sulfonamidate and sulfonamide ligands. Mes = mesityl...

Figure 2 shows an example of a UPS spectrum where the overlap between bands associated with ligand (Me, PPI13) and metal (Au5d) moieties is pronounced. On the other hand, metal core level ionizations in XPS spectra produce few distinct and easily recognizable peaks. 

Trifunctional sulfides RSCH2SCH2SR can be prepared. With platinum(II) the chelate complexes can be synthesized, and the free sulfide group then utilized for coordination to a second platinum The tetradentate ligands MeS(CH2) S(CH2)mS(CH2) SMe and (187)... 

In terms of its chemical properties, the isolated cofactor F43o resembles other nickel (II) complexes of tetraamine macrocycles with respect to redox and the binding of axial ligands. Me-Ni and RSNi derivatives of these macrocyclic complexes represent possible model intermediates for the C-S bond scission process [134]. 

The difference in metal metabolism between sucklings and adults could also be attributed to differences in metal binding ligands. Me-tallothioneins were found to be higher in the newborn than in older rats (Bakka and Webb, 1981 Asokan and Tandon, 1981 Bell, 1980). However, it was also found that metallothioneins do not play a major role in tissue distribution and retention of cadmium (Wong and Klaassen, 1980 Johnson and Foulkes, 1980). Results obtained by Kello et al. (1979) with rats also suggest that metallothioneins in intestinal mucosa do not serve as determinants of cadmium absorption. 

The assumption of a sterically enforced cluster formation was corroborated later in silverfi) iodide coordination chemistry ligated by our methylene-bridged NHCP hgands (Scheme 10.12) [48]. Thus, at lower steric bulk, the Af-mesityl ligand Mes-39 in this case still permitted the formation of a dinuclear complex, likely due to the enhanced flexibihty of the system in comparison to the rigid Af-phosphino systems, which allows the N-substituents to twist out of the coordination plane. For greater steric bulk, an N-tert-butyl substitution yielded the tetranuclear iodide cluster 56. 

Scheme 4.11 Reactivity of the Zr-Co complex 20 involving the metal-metal bond as well as transformations of the bridging phosphinoamide ligands mes=mesityl.

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