Formation Constants of Thallium(lll) with Fumaric, Maleic and Phthalic Acids

Chemistry Department, Faculty of Science, Assiut University, Assiut, Egypt Manuscript received 21 February 1984, accepted 3 May 1984 The complexation of TiIII with fumaric, maleic and phthalic asids are studied by the help of \(\mathcal{p}\)H-metric data obtained at \(\mathcal{p}\)H 2.0-3.5 and \(\mu\)=0.1 (H++Na+) \({CIO}^-_4\). 1: 1 metal to ligand complexes are detected and their conditional formation constants are log K=4.45, 4.90 and 5.65, respectively. The possibility of the existence of hydroxo and protonated complexes in solution is discussed. The 1 : 1 complexes with fumarate and phthalate are supported by condoctometric titrations whereas maleate gives 1 : 3 metal to llaand complex