摘要
EGTA is a kind of highly selective calcium-binding chelate, whose preference for the binding of Ca<sup>2+</sup> over Mg<sup>2+</sup> is about 10<sup>6</sup>, therefore it is considered as a model for the binding sites in calcium-binding proteins. Although the crystal structure of Ca （EGTA） has been reported, its structure in aqueous solution is still unclear. Considering that Ca<sup>2+</sup> ionic radius （0.99（?）） falls in the range for those of lanthanide series （1.06—0.85（?））, Ln （EGTA） （Ln=La, Y, Lu and Sc） is studied in this note so as to
基金
Project supported by the National Natural Science Foundation of China and the Science Foundation of Laboratory of Rare Earth Chemistry and Physics.
