Ligand geometry-driven formation of different coordination polymers from Zn(NO 3 ) 2 , 1,4-bpeb and phenylenediacetic acids

• Published in: CrystEngComm 2011-01, Vol.13 (6), p.1851-1857
• Main Authors: Liu, Dong, Chang, Yu-Jie, Lang, Jian-Ping
• Format: Article
• Language: English
• Subjects: Coordination polymers; Diffraction; Interpenetrating networks; Joining; Ligands; Linking; Two dimensional; X-rays
• ISSN: 1466-8033; 1466-8033
• DOI: 10.1039/C0CE00575D

The hydrothermal reactions of Zn(NO3)2[middle dot]6H2O with 1,4-bis[2-(4-pyridyl)ethenyl]benzene (1,4-bpeb), NaOH, and 1,4-phenylenediacetic acid (1,4-H2PDA), 1,3-phenylenediacetic acid (1,3-H2PDA) or 1,2-phenylenediacetic acid (1,2-H2PDA) afforded three coordination polymers {[Zn(1,4-PDA)(1,4-bpeb)][middle dot]2H2O}n (1), [Zn(1,3-PDA)(1,4-bpeb)]n (2) and [Zn4([small mu ]-OH)2(1,2-PDA)3(1,4-bpeb)2]n (3), respectively. All these compounds were characterized by elemental analysis, IR, powder X-ray diffraction, and single-crystal X-ray diffraction. 1 exhibits a five-fold interpenetrating 3D diamondoid framework constructed by linking Zn atoms with trans-1,4-PDA and trans-trans-trans-1,4-bpeb ligands. 2 has a 2D (4,4) network formed by connecting dinuclear [Zn2(1,3-PDA)2] (1,3-PDA serving as a trans conformation) units with trans-cis-trans-1,4-bpeb ligands. 3 could be considered as a 2D 5-connected network derived from linking tetranuclear [Zn4([small mu ]-OH)2(1,2-PDA)3] (1,2-PDA acting as cis and trans conformations) units via trans-cis-trans-1,4-bpeb bridges. The results provided some insight into the ligand geometry-driven assembly of coordination polymers. Thermal stability and photoluminescent properties of 1-3 were also investigated.