Perchlorates ligands

Figure 17.23 F.xamples of monodentate. ehelaiing and bridging perchlorate ligands.

CLATHROCHELATED METAL PERCHLORATES, HYDRAZINEMETAL NITRATES METAL PERCHLORATES organic ligands, POLYAZACAGED METAL PERCHLORATES SOLVATED OXOSALT INCIDENTS, URANYL MACROCYCLIC PERCHLORATE LIGANDS... 

On addition of AgN03 to a solution of 16, 17 or 18 in acetonitrile, the d-d transition at ca. 440 nm showed a hypsochromic shift and a decrease in absorbance indicative of 1 1 complex formation [38]. An X-ray crystal structure of the 1 1 silver perchlorate complex of 17 revealed a five-coordinate Ag" ion bound within a distorted square pyramid to four sulfur atoms and a perchlorate ligand [39]. 

Figure 17,23 Examples of monodentate, chelating and bridging perchlorate ligands.

Tetrahedral perchlorate ion, [C104] , is an uncommon ligand.1 The molecular perchlorato complexes of iridium and rhodium2 described here are thus of inherent interest as such, but their principal importance lies in their versatile reactivity. These compounds undergo addition, substitution, and addition-substitution reactions with many molecules and ions.3 In particular, the latter conversions lead to a remarkable number of cationic d8 complexes of these metals, which offer themselves as a unique series for a study of the electronic properties of a variety of molecules as ligands (L).3 Not less significant are the substitution reactions in which the perchlorate ligand is replaced by other unusual anions.4... 

The crystal structure of heptamethyl-cob(ll)yrinate (24) revealed a preference for incomplete Co(II)-corrins to coordinate the axial ligand at the sterically less hindered upper /1-face, in contrast with the result obtained from the complete cob(II)alamin. Analysis of complex 24 revealed a five-coordinated Co(II)-center to which a perchlorate ligand was coordinated at the /3-face, a long axial cobalt-oxygen bond (2.31 A) and a 6° fold angle of the corrin ligand [53]. 

The complex [Pd2R2(li-C104)2(PPh3)2] has been described as the first example of a dinuclear complex where two perchlorate ligands bridge the metal centers. 

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