Add time:07/18/2019         Source:sciencedirect.com

It has been shown that scandium(III) ion in strong chelate complexes with bidentate ligands can increase its coordination number typically from six to seven by formation of inner-sphere adducts with trioctylphosphine oxide (TOPO) or water. Stability constants of tris(tropolonato)scandium(III) and tris(ethylmaltolato)scandium(III) in water, log β3=21.6(1) and 23.3(1), and the formation constants of their 1:1 adducts with TOPO in toluene: log β3,1=4.07(2) and 1.69(1), respectively, were determined by the solvent extraction method. Tris(acetylacetonato)scandium(III), chelate of similar stability, does not form adducts with TOPO. Comparison of these data with those published elsewhere shows that formation of inner-sphere adducts by metal chelates is governed by factors related to both stability and structure of the chelate. For complexes with octahedral or slightly distorted octahedral environment the stability of adducts increases with decreasing stability of the complex, in line with the generally accepted rule. For complexes with octahedral environment considerably distorted toward trigonal prismatic, adduct formation is possible even if the complex is very strong. In this case, the ability to form adducts increases with decreasing ligand bite.

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