Complex Formation in the Ternary Systems of Beryllium(II)-Methylmalonic, Dimethylmalonic and Some Dicarboxylic Acids

Department of Chemistry, Marathwada University, Aurangabad-481 004 Manuscript received 24 March 1982, accepted 10 December 1982 The stability constants of binary and mixed methyl substituted malonic-dicarbo­xylic acid complexes of beryllium(II) have been determined. The substituted malonic acids arc methylmalonic and dimethylmalonic and the dicarboxylic acids are succinic, itaconic. maleic, glutaric and adipic. Beryllium(II) forms 1 : 1 and 1 : 2 complexes with all the ligands except glutaric and adipic in \(p\)H range 2.75-5.50. Ternary chelates of beryllium(II)-methylmalonic-dicarboxylic and beryllium(II). dimethyinialonic-dicarboxylic acid systems have been studied. Ternary complex formation is discussed on the basis of ring size, nature of the substituents in the ligands, equilibrium constants and coordination chemistry of beryllium(II). It is observed that the complex stability and ligand basicity gives straight line relationship