Wang Guo-Ming, Xue Shu-Yun, Li Hui, Liu Hui-Luan
Department of Chemistry, Teachers College of Qingdao University, Qingdao, Shandong 266071, People's Republic of China.
Acta Crystallogr C. 2009 Dec;65(Pt 12):m469-71. doi: 10.1107/S0108270109043856. Epub 2009 Nov 11.
In the title compound, La(2)(C(8)H(4)O(4))(2)(C(6)H(4)NO(2))(2), there are two crystallographically independent La centres, both nine-coordinated in tricapped trigonal prismatic coordination geometries by eight carboxylate O atoms and one pyridyl N atom. The La centres are linked by the carboxylate groups of isonicotinate (IN(-)) and benzene-1,2-dicarboxylate (BDC(2-)) ligands to form La-carboxylate chains, which are further expanded into a three-dimensional framework with nanometre-sized channels by La-N bonds. In the construction of the resultant architecture, in tricapped trigonal prismatic coordination geometries by eight carboxylate O atoms and one pyridyl N atom, while the BDC ligands link to four different cations each, displaying penta- and heptadentate chelating-bridging modes, respectively.
