SOLVENT-EXTRACTION OF GROUP-4 AND GROUP-14 METAL CHELATE COMPLEXES - MODEL EXPERIMENTS FOR CHEMICAL STUDIES ON COORDINATION-NUMBER OF ELEMENT-104

To verify the idea that the coordination number of element 104 could b e influenced by relativistic effects the studies on complexation of po ssible homologs of element 104 in group 4 (Zr4+, Hf4+, Ti4+) and 14 (S n4+, Pb4+ by thenoyltrifluoroacetone (TTA) and tropolone (T) were perf ormed Contrary to monodentate ligands, TTA forms octacoordinate comple xes not only with Zr4+ and Hf4+ but also with Ti4+, which are extracte d to organic phase Tropolone forms octacoordinate neutral complexes al so with group 14 metal cations Sn4+ and Pb4+. Since octacoordinate com plexes of Ti4+, Sn4+ with TTA and T are much weaker than the respectiv e complexes of Zr4+ and Hf4+, extraction of the former complexes to or ganic phase requires higher values of pH. The behavior of 104(4+) in e xperiments with TTA or T extractants should answer the question concer ning the similarity of 104(4+), in respect to CN to its lighter congen ers Zr4+ and Hf4+ or Ti4+ and group 14 elements.