Three-dimensional open frameworks [Co-2(nicotinate)(4)(mu -H2O]. CH3CH2OH .H2O, 1, and [Ni-2(nicotinate)(4)(mu -H2O)] . CH3CH2OH .H2O, 2, were obtained by hydro(solvo)thermal reactions between 3-cyanopyridine and cobalt(II) nitrate and nickel(II) perchlorate, respectively. Both I and 2 exhibit complicated 3-D structures based on [M-2(nicotinate)(4)(mu -H2O)] (M = Co or Ni) building blocks and possess open channels that are occupied by removable solvent molecules. 3-D open frameworks [M2L4(mu -H2O)]. HL . (H2O)(x) (where M = Co, x = 2.3, and M = Ni, x = 1, 4, and L = trans-3-(3-pyridyl)acrylate) were similarly prepared with trans-3-(3-pyridyl) acrylic acid in place of 3-cyanopyridine. Compounds 3 and 4 are isostructural and exhibit network topologies similar to that of 1 with open channels occupied by disordered trans-3-(3-pyridyl) acrylic acid and water guest molecules. Crystal data for 1: triclinic space group P1, a = 10.534(1) Angstrom, b = 11.907(1) Angstrom, c = 14.046(1) Angstrom, alpha = 106.645(1)degrees, beta = 101.977(1)degrees, gamma = 112.078(1)degrees, and Z = 4. Crystal data for 2:, tetragonal's space group P4/ncc, a = 20.089(1) Angstrom, c = 14.016(1) Angstrom, and Z = 4. Crystal data for 3: monoclinic space group C2/c, a = 14.082(2) Angstrom, b = 15.278(2) c = 18.537(2) Angstrom, beta = 105:360(2)degrees, and Z = 2. Crystal data for 4: monoclinic space group C2/c, a = 14.082(1) Angstrom, b = 15.250(1) Angstrom, c = 18.606(1) Angstrom, beta = 106.747(1)degrees, and Z = 2.