Oxyanions ligands

Phosphate and other Oxyanion Ligands 6.8.6.5.1 Phosphates and phosphonate ligands... 

Complexes with Oxyanion Ligands. The zirconium-peroxo-oxalato-complex [Zr(02)(C204 )(H20)2],3—4H2O, has been assigned the trans-diaquo octahedral structure (28) from spectroscopic and thermal studies. ... 

The coordination chemistry of aluminum with oxyanion ligands is chiefly that of the more highly oxidized ions. Nitrites and phosphites are unknown. Arsenites, sulfites, selenites and tellurites are mentioned in the early literature but have received little recent attention. 

The (5)-tryptophan-derived oxazaborolidenes utilized in this aldol study have been previously examined by Corey as effective catalysts for enantioselective Diels-Alder cycloaddition reactions [6]. Corey has documented unique physical properties of the complex and has proposed that the electron-rich indole participates in stabilizing a donor-acceptor interaction with the metal-bound polarized aldehyde. More recently, Corey has formulated a model exemplified by 7 in which binding by the aldehyde to the metal is rigidified through the formation of a hydrogen-bond between the polarized formyl C-H and an oxyanionic ligand [7], The model illustrates the sophisticated design elements that can be incorporated into the preparation of transition-metal complexes that lead to exquisite control in aldehyde enantiofacial differentiation. 

Little is known of the basic salts 209 Mn(OH)Cl has been decribed in two crystalline forms, which are said to have layer structures related to Mg(OH)2 and the compounds Mn2(OH)3X (X = Cl, Br, I) also are known, with the chloro compound again in two different crystalline forms, one of which occurs in the mineral kempite, isotypic with <5-Cu2(OH)3Cl. Crystalline phases containing both OH-and oxyanion ligands are covered in Section 41.3.5.2. 

This relationship has been derived for a variety of oxyanion ligands, and provides a useful approximation for a wide range range of compounds, but is a relatively poor predictor of detailed behaviour within smaller compound groups, such as the anhydrous silicates. Relationship (7.8) has also proved unable to explain the effect of bond... 

---