Volatile organic barium, strontium and calcium compounds and method for the preparation of layered materials with barium, strontium or calcium oxides or fluorides from these compounds

摘要

There is provided a volatile, thermally stable complex of a barium, strontium or calcium β-diketonate coordinated with one or more coordinating ligands, wherein the complex is of the formula where M is Ba, Ca or Sr; R' and R'' are independently selected from alkyl, substituted alkyl, aryl and substituted aryl groups, the said substituted alkyl and aryl groups containing as the only substituent(s) one or more fluorine atoms; L is a neutral oxygen donor ligand or a neutral nitrogen donor ligand; m has a value of from 1 - 6; and wherein at least one of the coordinating ligands of the calcium complex is formed by a neutral oxygen donor ligand.