Catena-Poly[[[triaqua-europium(III)]-?-(1H-benzimidazole-5,6-dicarboxyl-ato-?O:O)-?-(1H,3H-benzimidazol-3-ium-5,6-dicarboxyl-ato-?O:O,O)] dihydrate].

ABSTRACT: In the title one-dimensional coordination polymer, {[Eu(C(9)H(4)N(2)O(4))(C(9)H(5)N(2)O(4))(H(2)O)(3)]·2H(2)O}(n), one of the 1H-benzimidazole-5,6-dicarboxyl-ate (Hbdc) ligands is protonated at the imidazole group (H(2)bdc). The Eu(III) ion is eight-coordinated by two O atoms from two Hbdc ligands, three O atoms from two H(2)bdc ligands and three water mol-ecules, showing a distorted square-anti-prismatic geometry. The Eu(III) ions are bridged by the carboxyl-ate groups of the Hbdc and H(2)bdc ligands, forming a chain along [110], with an Eu?Eu separation of 5.4594?(3)?Å. These chains are further connected by inter-molecular O-H?O, N-H?O and N-H?N hydrogen bonds, as well as ?-? inter-actions between the imidazole and benzene rings [centroid-centroid distances = 3.558?(3), 3.906?(2), 3.397?(3), 3.796?(2) and 3.898?(2)?Å], into a three-dimensional supra-molecular network.

SUBMITTER: Chen XY 

PROVIDER: S-EPMC3200846 | biostudies-other | 2011 Sep

REPOSITORIES: biostudies-other