New Open Frameworks Based on Metal Pyridylphosphonates

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 1D ladder structure, while
Co(4-pyridylphosphonate)(H2O)3, 2, adopts a 2D grid structure. [Cu2(4-pyridylphosphonate)2]·2H2O, 3, [Cd(3-pyridylphosphonate)2]·DMSO, 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) Å; β = 98.68(2)°; Z = 8. Crystal data for 2:  monoclinic
space group P21/c; a = 9.634(12), b = 7.611(9), c = 11.901(1) Å; β = 97.830(2)°; Z = 4. Crystal data for 3: 
triclinic spacegroup P1̄; a = 7.464(8), b = 9.203(1), c = 11.602(2) Å; α = 100.289(1)°; β = 104.532(1)°, γ =
94.569(1)°; Z = 2. Crystal data for 4:  tetragonal space group I41/a; a = 15.114(2), b = 15.114(2), c = 13.128(3)
Å; Z = 8. Crystal data for 5:  monoclinic space group P21/c; a = 8.344(2), b = 10.589(2), c = 14.384(3) Å; β
= 91.77(3)°; Z = 4. Crystal data for 6:  monoclinic space group P21/n; a = 5.606(1), b = 11.198(1), c = 14.176(2) Å; β = 94.518(1)°; Z = 2.