Nonbridging ligands

S.2.2.2. Dimers and Clusters with Nonbridging Ligands 8.2.2.2.I. Syntheses from Metal Vapors. 

Earley, Joseph E., Nonbridging Ligands in Electron-Transfer Reactions. 13 243... 

P—O average 1.62 A for nonbridging ligands P—O average 1.54 A for bridging ligands... 

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... 

From the values given in Table XIII it is noted that Kd is apparently much more sensitive to variation of the nonbridging ligands than to variation of the metal ion. It is seen that Kd for all the aqua metal ions lies within a relatively narrow range of about 103 5 M-1. In contrast, chromium(III) and cobalt(III) amine complexes have Kd values which vary by at least five orders of magnitude. 

Studies of the hydroxo-bridge cleavage in basic solution are often complicated by hydrolysis of the nonbridging ligands, and few kinetic studies have been made. The kinetics of hydrolysis of the (en)2Co(OH)2Co(en)24+ ion in basic solution indicate two consecutive steps, and different mechanisms involving cleavage of the presumed intermediate (H20)(en)2Co(OH)Co(en)2(OH)4+ (or its deprotonated... 

Case 1. A one-dimensional system in which the donor and acceptor differ only in the distances between metal and some nonbridging ligand(s),... 

The TeFs group has been shown to provide a large nonbridging ligand with an electronegativity approaching that of fluorine. The ether FsTe-O-TeFs was prepared by direct fluorination of Te02 with F2/N2. 

The reader is referred to other chapters for (i) aromatic nitrogen-donor nonbridging ligands bipyridines (Chapter 1.1), terpyridines (Chapter 1.3), phenanthrolines (Chapter 1.2), porphyrins... 

Studies on Pt(II)-catalyzed substitution reactions of Pt(IV) show striking nonbridging-ligand effects, e.g., the rate law for substitution of labeled chloride in cis-and trans-fPtCNHjj Cl j takes place by the rate law ... 

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