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The crystal and molecular structures of K3[Tb^Ⅲ(nta)2(H2O)]·5.5H2O (nta=nitrilotriacetic acid) and K3[Yb^Ⅲ(nta)2]·5H2O complexes have been determined by single-crystal X-ray structural analyses. Because Tb^Ⅲ and Yb^Ⅲ have different ionic radii a