Synthesis and crystal structure of a 1D chained coordination polymer containing one-dimensional egg-like channels:: {[Cu2(C2O4)2(inta)4](inta)}n (inta = isonicotinamide)

A new one-dimensional copper coordination polymer chain has been prepared and fully characterized by single-crystal X-ray diffraction, elemental analyses and IR spectroscopy. The compound {[Cu-2(C2O4)(2)(inta)(4)](inta)}(n) 1 crystallizes in the triclinic system, space group P-(1) over bar, with a = 8.4722(5), b = 10.9825(6), c = 11.6128(6) angstrom, alpha = 104.8050(10), beta = 102.5740(10), gamma = 109.6890(10)degrees, V= 927.18(9) angstrom(3), M-r = 929.79, Z = 1, D-c 1.665 g/cm(3), F(000) = 475, mu = 1.231 mm(-1) R = 0.0453 and wR = 0.1185 for 3290 observed reflections (I > 2 sigma(I)). Of the compound, the Cu center is octahedrally coordinated with oxalate acting as a tetra-dentate ligand coordinated to the copper atom and each inta serving as a terminal ligand by employing only one N-donor to coordinate with the Cu center. An infinite {Cu-2(C2O4)(2))(infinity) chain is formed along the c axis. Furthermore, the ID chains are held together via extensive hydrogen-bonding interactions to generate a three-dimensional network with 1D channels (ca. 5.491 angstrom x 11.507 angstrom) where inta molecules are filled.