Structure-directing influences of dipodal organoimine ligands: hydrothermal synthesis and structure of a three-dimensional cobalt vanadate, [Co3(bpypr)4(H2O)4V6O18]·2H2O (bpypr=1,3-di-4-pyridylpropane)

The hydrothermal reaction of CoCl2·6H2O, NaVO3, 1,3-di-4-pyridylpropane (bpypr) and water in the mole ratio 1.0:1.1:2.0:1500 at 120 °C for 48 h yields [Co3(bpypr)4(H2O)4V6O18]·2H2O (1·2H2O) as red crystals in 45% yield. The structure of 1 is constructed from three distinct substructures: two-dimensional {Co(bpypr)2}n2n+ networks, one-dimensional {Co(H2O)2(bpypr)}n2n+ chains and vanadate spirals. Each vanadate chain links two adjacent networks, while vanadate and cobalt chains interlink to form a three-dimensional framework. Crystal data for C26H34N6O12Co1.5V3: monoclinic P21/n, a=13.0977(7) Å, b=16.5226(a) Å, c=15.3842(8) Å, β=102.246(1)°, V=3253.5(3) Å3, Z=4, D calc.=1.706 g cm−3. Synopsis: The hydrothermal reaction of CoCl2·6H2O, NaVO3, 1,3-di-4-pyridylpropane (bpypr) and water yields the three-dimensional organic–inorganic hybrid material [Co3(bpypr)4(H2O)4V6O18]·2H2O, shown below.