The Present State and Future Development of Co-Ordination Chemistry

Abstract

D b r i e m e n t d'ktrophysique Relativiste et d e Cosmologie O b m t o i r e , 92190 Meudon, France AbsImacL Slatting from the equations of motion obeyed by fields, as they result from general approximations [they are m!ia to be of the following form [k2n(k)]+ = 0, for quasi bosons, and a similar equation for quasifermions] a lagmgian formalism is derived and, accordingly, consewed quantities are obtained. Next these fields are quantized and general expressions for the main observables are derived. Statistical mechanics of quasiparlicles then follow via the use of covariant Wigner functions.

Thermodynamic interpretation of zirconium solubility in the presence of hydroxyacetic, 3-hydroxypropionic, and 2,3-dihydroxypropanoic acids

“…Zirconium(IV) solubility in groundwater is generally limited by its sparingly soluble Zr(OH) 4 (am), and a very few inorganic or organic ligands can compete with the strong hydrolysis reactions that occur in neutral to alkaline solutions. For example, oxalic acid ((COOH) 2 , C20) forms stable Zr(IV) complexes via its two carboxylate groups in acidic to weakly acidic solutions [11][12][13]. However, according to thermodynamic calculations [13], the hydrolysis reaction competes effectively with C20 complexation which causes only a minor change in Zr(IV) solubility in neutral to alkaline solutions.…”

Preparation, spectral and thermal studies of neodymium zirconyl oxalate hexahydrate

“…It has been demonstrated by several workers that high purity titanates, stannates, ferrites, zirconates of perfect stoichiometry can be prepared from pyrolysis of mixed metal oxalate systems [1][2][3][4]. Zirconium is reported zo form anionic oxalato zirconates [5] and thermal decomposition of such complex s~lts make up an interesting study. The lack of literature on oxalato zirconates of trivalent cations led us to prepare and study the thermal decomposition of neodymium zirconyl oxalate whose end product is expected to be a mixed oxide.…”