| Abstract: Two complexes, Fe(pda)2(H2O)4 (1) and [FeCo(pda)4(H2O)4]n (2) (pda=3-(3-pyridyl) acrylate acid), were synthesized by hydrothermal reaction, and characterized by elemental analysis, IR spectroscopy, TG-GDA，and single crystal X-ray diffraction technique. Both compounds belong to monoclinic system, space group P21/n with a=1.138 64(18) nm, b=0.706 04(12) nm, c=1.215 8(2) nm, β=112.492(2)°, V=0.903 0(3) nm3, Z=2, Dc=1.560 g·cm-3, F(000)=440, μ=0.883 mm-1, R1=0.031 6, wR2=0.088 9 for 1; space group P21/c with a=1.697 8(2) nm, b=0.547 00(8) nm, c=1.803 9(3) nm, β=106.242(2)°, V=1.608 4(4) nm3, Z=2, Dc=1.609 g·cm-3, F(000)=802, μ=1.039 mm-1, R1=0.029 1, wR2=0.065 6 for 2. In complex 1, the Fe(Ⅱ) central ion is six-coordinated by two N atoms from two 3-(3-pyridyl) acrylate acid and four O atoms from four coordinated water molecules, and the carboxyl group of the ligand is not involved in coordination. The three-dimensional supramolecular structure of complex 1 is constructed by hydrogen bonds of O-H(coordinated water molecule)…O(carboxyl group). In complex 2, both N atom of the pyridyl and O atom of the carboxylate of the ligand are involved in coordination, and the carboxylate takes the mode of the monodentate. The bridging of the ligand connects the metal ions into a two-dimensional layer structure. CCDC: 688740, 1; 688741, 2. |
