| Abstract: Reaction of sodium dicyanamide (Na(dca)) and isonicotinamide (L) with Cu(NO3)2·3H2O or Cd(NO3)2·6H2O, generating two complexes, 1D [Cu(L)2(dca)2] ·2MeOH (1) and 2D [Cd(L)2(dca)2] (2), which were characterized by elemental analysis and IR. X-ray crystal structure analysis displays that 1 crystallizes in the triclinic system, space group P1 with a=0.680 07(6) nm, b=0.737 59(6) nm, c=1.154 05(10) nm, α=99.955 0(10)°, β=90.307 0(10)°, γ=103.294 0(10)°, V=0.554 28(8) nm3, Z=2. 2 is in the monoclinic system, space group P21/c with a=1.043 77(7) nm, b=0.956 30(6) nm, c=1.055 93(7) nm, β=119.333 0(10)°, V=0.918 85(10) nm3, Z=4. 1 is a neutral 1D coordination chain, in which the CuⅡ centers are interlinked through double μ1,5-dca bridges and L acts as monodentate terminal ligand. These coordination chains are further expanded into a 2D layer through N-H…N hydrogen bonds. The N-H…O, O-H…O interactions from CH3OH molecules and L generate a 3D supramolecular architecture. While in 2, each cadmium ion coordinates to four dca anions in a μ1,5 mode to link neighboring four metal ions to generate a 2D (4,4) sheet. The N-H…O and N-H…N hydrogen-bonding interactions between L expand these layers into a 3D supramolecular network. CCDC: 742680, 1; 742679, 2. |
