A family of new 1D, 2D, and 3D coordination networks based on metal-pyridylphosphonates have been synthesized under hydro(solvo)thermal conditions. Zn(3-pyridylphosphonate)(bromide), 1, adopts a I D ladder structure, while 2, adopts a 2D grid structure. [Cu-2(4-pyridylphosphonate)(2)](.)2H(2)O, 3, [Cd(3-pyridylphosphonate)(H2O)(3), pyridylphosphonate)(2)](DMSO)-D-., 4, Cd(4-pyridylphosphonate)(2), 5, and Cd(ethyl 4-pyridylphosphonate)(2), 6, all adopt 3D framework structures. While 3 possesses open channels that are occupied by water molecules, 4 exhibits cavities that accommodate DMSO guest molecules. The present work demonstrates that interesting open frameworks can be readily synthesized on the basis of metal pyridylphosphonates. Crystal data for 1: monoclinic space group, C2/c; a = 15-267(4), b = 11.903(2), c = 10.380(2) Angstrom; beta = 98.68(2)degrees; Z = 8. Crystal data for 2: monoclinic space, group P2(1)/c; a = 9.634(12), b = 7.611(9), c = 11.901(1) Angstrom; beta = 97.830(2)degrees; Z = 4. Crystal data for 3: triclinic spacegroup P (1) over bar; a = 7.464(8), b = 9.203(1), c = 11.602(2) Angstrom; alpha = 100.289(1)degrees; beta = 104.532(1)degrees, gamma = 94,569(l)degrees; Z = 12 Crystal data for 4: tetragonal space group I4(1)/a; a = 15.114(2), b = 15.114(2), c = 13.128(3) Angstrom; Z = 8. Crystal data for 5: monoclinic space group P2(1)/c; a = 8.344(2), b = 10.589(2), c = 14.384(3) Angstrom; beta = 91.77(3)degrees; Z = 4. Crystal data for 6: monoclinic space group P2(1)/n; a = 5.606(1), b = 11,198(1), c = 14.176(2). Angstrom; beta = 94.5 18(1)degrees; Z = 2.