Construction of N,N′-di(3-pyridyl)adipoamide-based Zn(ii) and Cd(ii) coordination networks by tuning the isomeric effect of polycarboxylate ligands
作者:Pei-Chi Cheng、Ming-Hao Wu、Ming-Yuan Xie、Wun-Jhih Huang、Hsiu-Yi He、Tsung-Tai Wu、Yang-Chih Lo、Davide M. Proserpio、Jhy-Der Chen
DOI:10.1039/c3ce41622d
日期:——
Eight new Zn(II) and Cd(II) coordination networks containing N,Nâ²-di(3-pyridyl)adipoamide (L) and polycarboxylate ligands, [Zn2(2,5-PDC)2(L)(H2O)2]·2H2O}â (H2PDC = 2,5-pyridinedicarboxylic acid), 1, [Zn2(2,6-PDC)2(L)]â, 2, [Zn2(3,4-PDC)2(L)(H2O)6]·4H2O}â, 3, [Cd(2,6-PDC)(L)(H2O)]·4H2O}â, 4, [Zn(1,3,5-HBTC)()]â (H3BTC = benzenetricarboxylic acid), 5, [Cd(1,2,3-HBTC)(L)(H2O)]·H2O}â, 6, [Cd2(1,3,5-HBTC)2(L)(H2O)2]·2H2O}â, 7, and [Zn3(1,2,4-BTC)2(L)(H2O)4]·4H2O}â, 8, have been synthesized by hydrothermal reactions and characterized by single crystal X-ray crystallography. Structural analysis reveals that 1 and 2 form pleated hcb layers with 1D helical chains, in which the layers of 1 interdigitate with each other and those of 2 are linked by the ÏâÏ stacking interactions. Complexes 3 and 4 exhibit 1D ladders with single and double rungs, respectively, whereas 5 shows a 2D pleated net with the sql topology, 6 displays a 3D dia coordination network and 7 forms a 2D structure with the (63)(66)-3,4L88 topology. The BTC3â ligands in 8 adopt the μ4-bonding modes, resulting in a 3D coordination network with the rare (65·8)-hxg-d-4-P2/c topology. The various bonding modes, the ligand-isomerism of the polycarboxylate ligands and the identity of the metal center play important roles in determining the structural diversity. Their thermal and luminescent properties are also discussed.
合成了八种新的Zn(II)和Cd(II)配位网络,包含N,N'-二(3-
吡啶基)己二酰胺(L)和多
羧酸配体,分别为[Zn2(2,5-
PDC)2(L)(
H2O)2]·2 }∞(H2
PDC = 2,5-
吡啶二
羧酸),1,[Zn2(2,6-
PDC)2(L)]∞,2,[Zn2(3,4-
PDC)2(L)( )6]·4 }∞,3,[Cd(2,6-
PDC)(L)( )]·4 }∞,4,[Zn(1,3,5-H
BTC)()]∞(H3
BTC = 苯
三羧酸),5,[Cd(1,2,3-H
BTC)(L)( )]· }∞,6,[Cd2(1,3,5-H
BTC)2(L)( )2]·2 }∞,7,以及[Zn3(1,2,4-
BTC)2(L)( )4]·4 }∞,8。这些化合物通过
水热反应合成,并通过单晶X射线晶体学进行表征。结构分析表明,1和2形成褶皱的hcb层,拥有1D螺旋链,其中1的层互相交错,而2的层通过π-π堆叠相互连接。复合物3和4分别展示了具有单横档和双横档的1D梯子结构,而5则表现出具有sql拓扑的2D褶皱网,6展示了3D dia配位网络,7形成具有(63)(66)-3,4L88拓扑的2D结构。8中的
BTC3-
配体采用μ4键合模式,导致形成具有稀有(65·8)-hxg-d-4-P2/c拓扑的3D配位网络。各种键合模式、多
羧酸配体的异构性以及
金属中心的特性在决定结构多样性方面起着重要作用。还讨论了它们的热学和发光特性。