2维双螺旋层配合物的构筑及表征

Synthesis and Characterization of the Double-Layer 2D Compound with Helix

在水热条件下合成一种新型2维(2D)聚合物[Ni2(pda)2(bpp)2(H2O)3](1)(1,4-pda=对苯二乙酸、bpp=1,3-二(4-吡啶基)丙烷).采用红外光谱、差热-热重、CHN元素分析及单晶X-射线衍射等手段对晶体结构进行了表征.配合物1属3斜晶系,空间群为P-1;晶体学参数:a=9.925(4)nm,b=12.863(6)nm,c=18.710(8)nm;α=101.813(9)°,β=99.133(9)°,γ=90.240(9)°.其基本结构单元由2个Ni(II)原子、3个对苯二乙酸根、4个1,3-二(4-吡啶基)丙烷和3个配位水分子组成.对苯二乙酸根与Ni(Ⅱ)原子交替连接形成1维右手螺旋链,相邻同手性螺旋链通过TG构型的1,3-二(4-吡啶基)丙烷连接形成2维右手螺旋层A.同样,对苯二乙酸根、Ni(Ⅱ)原子、1,3-二(4-吡啶基)丙烷形成2维左手螺旋层B.这2个相邻螺旋层A、B间通过[Ni2bpp2]闭合环的支撑形成双层2维结构.

A novel two-dimensional（2D） polymer [Ni2（pda）2（bpp）a（H2O）3] （1） （H2pda=1,4-phenylenediacetic acid,bpp=1,3-bi（4-pyridyl）propane） was obtained through hydrothermal reaction and characterized by means of elemental analysis,IR,TG-DSC and single crystal X-ray diffraction. The results show that the complex 1 is triclinic and crystallize in central symmetrical space group P-1, a=9.925（4） rim, b=12.863（6） nm, c=18.710（8） nm; α=101.813（9）°, β=99.133（9）°, ）,=90.240（9）°. The crystal structure of complex 1 consists of two Nickel（Ⅱ）, threel, 4-pda ligands, four 1.3-di（4-pyridy） butane ligands and three water moleculars. The 1,4-pda anions bridge the Ni （Ⅱ） ions to form a 1D right-handed helical chain. Moreover, these helical chains are united together through the TG bpp ligands to afford a right-handed 2D helical layer（namely, A layer）. At the same time, the 1,4-pda anions, Ni（Ⅱ） ions and bpp ligands form a left-handed 2D helical layer （namely, B layer）. The overall architecture is constructed from alternate A and B helical layers pillared by the closed [Ni2bpp2] rings, affords a double-layer 2D.