Four new coordination polymers (CPs), [Co3(L)2(bib)3(EtOH)2]·2H2O (1), [Mn3(L)2(bib)2(H2O)4]·4H2O (2), [Ni(HL)(bib)(H2O)3] (3) and [Ni3(bib)4(H2O)10]·2(L)·12(H2O) (4), were synthesized under solvothermal conditions with an unsymmetrical tricarboxylic acid ligand [biphenyl-3,3′,5-tricarboxylic acid (H3L)] in the presence of the 1,4-bis(1H-imidazol-4-yl)benzene (bib) ligand. In compound 1, tricarboxylate acid ligands (H3L) link Co centers to generate two-dimensional (2D) layers which are further connected by bib ligands to exhibit a three-dimensional (3D) framework with a (4,4,5)-connected (42·63·8)2(42·67·8)2(64·8·10) topology. The three-dimensional (3D) framework of 2 is defined as a (3,3,4)-connected topology with the point symbol of (6·82)2(62·8)2(8·104·12). Compound 3 contains a one-dimensional (1D) left-hand helix chain along the a direction and further extends into a 2D supramolecular network and a 3D supramolecular framework via hydrogen bonds. Compound 4 displays a one-dimensional (1D) molecular ladder, which is further combined with each other through π⋯π stacking to extend into 2D supramolecular sheets. The supramolecular networks of 3 and 4 resulted from the different solvent ratios [V(H2O)–V(EtOH)] in the reaction. All the CPs are characterized by single-crystal X-ray diffraction analyses, powder X-ray diffraction (PXRD), elemental analyses, IR spectroscopy, and TGA analyses. Moreover, the weak ferromagnetic properties of 2 and 3 and antiferromagnetic properties of 1 and 4 have also been investigated.
四种新型配位聚合物[Co3(L)2(bib)3(EtOH)2]·2 (1), [Mn3(L)2(bib)2(
H2O)4]·4 (2), [Ni(HL)(bib)( )3] (3)和[Ni3(bib)4( )10]·2(L)·12( ) (4)通过1,4-双(1\(H\)-
咪唑-4-基)苯(bib)
配体与非对称
三羧酸配体[
联苯-3,3',5-
三羧酸(H3L)]为原料,在溶剂热条件下被合成。在化合物1中,
三羧酸配体(H3L)连接
钴中心以产生二维(2D)层,将其通过bib
配体连接,展示了一个具有(4,4,5)-连接的(42·63·8)2)2(42·67·8)2(64·8·10)拓扑结构的立体(3D)框架。化合物2的立体(3D)框架被定义为一个(3,3,4)-连接的拓扑结构,具有点符号(6·82)2(62·8)2(8·104·12)。化合物3含有一维左旋螺旋链沿着a方向排列,进而拓展为一个二维超分子网络和一个三维超分子框架,通过氢键连接。化合物4显示出一个一维分子梯,其通过π⋯π堆积进一步相互结合,扩展到二维超分子片层。来自反应中不同溶剂比例[V( )\-V(EtOH)]的超分子网络的3和4。所有的配位聚合物都是通过单晶X射线衍射分析,粉末X射线衍射(PXRD),元素分析,红外光谱(IR)和热重(TGA)分析进行表征的。此外,研究了2和3的弱
铁磁特性以及1和4的反
铁磁特性。