Synthesis and Crystal Structure of a New Complex Constructed from a Flexible Tetrapyridyl Ligand

The title complex [Cd-2(NO3)(2)(OCH3)(2)(TPOM)(2)]center dot 8H(2)O (TPOM = tetrakis(4-pyridyloxymethylene) methane) has been synthesized and characterized by IR spectroscopy, elemental analysis and single-crystal X-ray diffraction. It crystallizes in the orthorhombic crystal system Ccca with a = 17.125(2), b = 40.751(3), c = 24.938(2) angstrom, beta = 90.00 degrees, V = 17403(3) angstrom(3), C26H27N5O8Cd, M-r = 649.93, Z = 16, F(000) = 5280, D-c = 0.992 mg/m(3), mu(MoK alpha) = 0.538 mm(-1), S = 1.080, the final R = 0.0533 and wR = 0.1449 for 6627 observed reflections (I > 2 sigma(I)). The crystal structure shows that each Cd atom is coordinated to four pyridyl nitrogen atoms from four TPOM ligands and each tetrahedral TPOM ligand links up four Cd atoms into a 2-fold interpenetrating 3D framework. The TG analysis shows that the framework of the title complex is stable up to 300 degrees C.