Synthesis and crystal structure of two praseodymium 2-iodobenzoic acid complexes

Two new complexes, {[Pr(2-IBA)(3) center dot 2,2 '-bipy](2) center dot[Pr(2-IBA)(3) center dot 2,2 '-bipy](2) center dot 0.5C(2)H(5)OH center dot H2O} (1) and [Pr(2-IBA)(3) center dot phen](2) (2) (2-IBA = 2-iodobenzoate; 2,2 '-bipy = 2,2 '-bipyridine; phen = 1,10-phenanthroline) were synthesized, and their crystal structures were determined by X-ray diffraction. Complex 1 consists of two binuclear molecules [Pr(2-IBA)(3) center dot 2,2 '-bipy](2) (a) and [Pr(2-IBA)(3) center dot 2,2 '-bipy](2) (b), half uncoordinated ethanol and one uncoordinated water. In the two molecules ( a) and ( b), the coordination environment of central ions is similar. The Pr1(3+) ion in molecule (a) and Pr2(3+) ion in molecule (b) are nine-coordinate with seven oxygen atoms from five 2- IBA ligands and two nitrogen atoms from one 2,2 '-bipy molecule. The crystal structure of complex 2 is similar to that of binuclear [Pr(2-IBA)(3) center dot 2,2 '-bipy](2) in complex 1.