具有纳米孔结构的配位聚合物[Co2(HO-BDC)2(bpe)2(H2O)2]n·n(py)·nH2O的合成、晶体结构与热稳定性

在水-吡啶混合体系中, 以5-羟基-1,3-苯二甲酸(简作HO-H2BDC )、1,2-二(4-吡啶)乙烷(简作bpe)为配体与Co(NO3)2·6H2O反应, 培养出Co2(HO-BDC)2(bpe)2(H2O)2]n·n(py)·nH2O(py=pyridine)的紫色单晶, 该晶体属三斜晶系, P1空间群, 晶胞参数a=1.0245(3) nm, b=1.1467(3) nm, c=1.2430(4) nm, α=68.915(5)°, β=67.163(4)°, γ=71.373(4)°, V=1.2279(6) nm3, Z=1, Mr=979.70, Dc=1.325 Mg/m3, F(000)=506, μ=0.740 mm-1, R1=0.0515, wR2=0.1058. 该配位聚合物中在ac平面上具有规则平行四边形纳米尺寸的孔, 其孔径大小约为1.025 nm×1.354 nm, 而且通过氢键相互作用连成具有双层结构的2D网络结构. TGA曲线表明, 配位聚合物的失重发生在110~150 ℃之间, 总失重约为80.1%, 最终产物为Co2O3.

Synthesis, Crystal Structure and Thermal Stability of Coordination Polymer [Co2(HO-BDC)2(bpe)2(H2O)2]n·n(py)·nH2O with Nanoscale Channels

A novel coordination ploymer Co2(HO-BDC)2(bpe)2(H2O)2]n·n(py)·nH2Owhere HO-H2BDC is 5-hydroxyisophthalic acid and bpe is 1,2-bis(4-pyridyl)ethane, py is pyridine] with nanoscale channels was synthesized and characterized via elemental analysis, IR spectra and single-crystal X-ray diffraction. The crystal belongs to triclinic crystal system, space group P1, with a=1.0245(3) nm, b=1.1467(3) nm, c=1.2430(4) nm, α=68.915(5)°, β=67.163(4)°, γ=71.373(4)°, V=1.2279(6) nm3, Z=1, Mr=979.70, Dc=1.325 Mg/m3, F(000)=506, μ=0.740 mm-1, the final R1=0.0515 and wR2=0.1058 for 3625 observed reflections with I>2σ(I). The coordination polymer has a 2D rectangular grid framework parallel to the ac plane with a dimension of 1.025 nm×0.1354 nm via strong hydrogen-bonding interactions. TGA curves of the coordination polymer show three main weight losses in the range of 110—150 ℃, 200—300 ℃ and 320—450 ℃ corresponding to the removal of non-coordinatated water molecules, non-coordinatated py molecules and the water and bpe molecules attached to metal, respectively, and the final residue is identified to be Co2O3.