论文部分内容阅读
使用硝酸镍分别与2个含取代基的苯基二羧酸3-硝基邻苯二甲酸(3-NPAH2)和5-溴间苯二甲酸(H2BIPA)以及2个刚性含氮配体4,4′-联吡啶(4,4′-bipy)、1,4′-二咪唑基二苯(L=1,4′-bis(imidazol-yl)benzene)在水热条件下合成了2个镍配位聚合物,即,[Ni(3-NPA)(4,4′-bipy)(H2O)]n(1)和[Ni(BIPA)(L)]n(2)。表征了2个化合物的红外光谱、元素分析、热重、X-射线单晶衍射以及X-射线粉末衍射。化合物1是三斜晶系,P1空间群,含有[Ni(OCO)4Ni]双核单元,该双核单元再通过4,4′-联吡啶连接而成一个二维单层结构。层与层之间通过羧酸氧原子与配位水分子之间产生氢键作用。化合物2是单斜晶系,P21/c空间群,含有[Ni2(COO)2]双核单元,该双核单元进一步通过BIPA2-构成了一个双链结构,该双链再通过1,4′-二咪唑基二苯桥联配体连接形成了一个三维框架结构。此外,热重分析结果显示化合物2具有较高的热稳定性。
Nickel nitrate was used in combination with two substituted phenyl dicarboxylic acids 3-nitro phthalic acid (3-NPAH2) and 5-bromoisophthalic acid (H2BIPA) and two rigid nitrogen-containing ligands 4, 4’-bipy (4,4’-bipy) and 1,4’-bis (imidazol-yl) benzene were synthesized under hydrothermal conditions The coordination polymers, namely [Ni (3-NPA) (4,4’-bipy) (H2O)] n (1) and [Ni (BIPA) (L)] n (2). The two compounds were characterized by IR, elemental analysis, TG, X-ray single crystal diffraction and X-ray powder diffraction. Compound 1 is a triclinic, P1 space group containing binuclear units of [Ni (OCO) 4Ni], which are then connected by 4,4’-dipyridyl to form a two-dimensional monolayer. The hydrogen bonds between the oxygen atoms of the carboxylic acid and the coordinated water molecules are generated between the layers. Compound 2 is a monoclinic, P21 / c space group containing a binuclear unit of [Ni2 (COO) 2], which further forms a double-stranded structure by BIPA2-, which double- Imidazolyl dibenzene bridged ligands form a three-dimensional framework structure. In addition, thermogravimetric analysis showed that compound 2 has higher thermal stability.