| Abstract: A novel schiff-base ligand based on N,O-bifunctional coordination group and its cadmium(Ⅱ) complex, namely 4-(pyridin-2-ylmethylamino)benzoic acid (4,2-pmabaH) (1) and [Cd2(4,2-pmaba)2(H2O)6](4,2-pmaba)2·2H2O (2), respectively, were obtained in ethanol/water system. Both the ligand and complex were characterized by elemental analysis and X-ray crystal structure analysis. The ligand 1 crystallizes in orthorhombic, space group Pna21 with a=2.913 1(6) nm, b=1.054 8(2) nm, c=0.722 08(16) nm, V=2.218 7(9) nm3, Z=8, Dc=1.367 g·cm-3, F(000)=960, μ=0.094 cm-3, the final R=0.077 6, wR=0.185 8; in which C-H…π interactions play important roles in structural stabilization. While the complex 2 crystallizes in orthorhombic, space group Pbcn with a=1.335 39(12) nm, b=0.944 24(8) nm, c=4.094 5(4) nm, V=5.162 9(8) nm3, Z=8, Dc=1.644 g·cm-3, F(000)=2 608, μ=0.904 cm-1, the final R=0.064 9, wR=0.132 8. In complex 2, the coordination environment of Cd(Ⅱ) is a distorted pentagonal-bipyramid with N2O5 set. Two types of ligand with different conformations and coordination modes are found in complex 2. The M2L2 cyclic structural units in 2 are further connected by hydrogen bonds to give a three-dimensional structure. Their photoluminescent properties were also investigated. CCDC: 690113, 1; 690114, 2. |
