Syntheses, structures, and magnetic properties of six coordination polymers based on 4,5-di(4′-carboxylphenyl)phthalic acid and different bis(imidazole) bridging linkers

• Published in: CrystEngComm Vol. 16; no. 33; pp. 7649 - 7659
• Main Authors: Fan, Liming, Gao, Yan, Liu, Guangzeng, Fan, Weiliu, Song, Weikuo, Sun, Liming, Zhao, Xian, Zhang, Xiutang
• Format: Journal Article
• Language: English
• Published: 01.01.2014
• Subjects: Bridging; Carbon dioxide; Coordination polymers; Diffraction; Displays; Magnetic properties; Symbols; X-rays
• ISSN: 1466-8033; 1466-8033
• DOI: 10.1039/C4CE00760C

Six 4,5-di(4′-carboxylphenyl)phthalic acid (H 4 DCP) based coordination polymers (CPs), namely {[Ni(1,4-bib)(HDCP) 2 (H 2 O) 2 ] 0.5 [Ni(1,4-bib)(H 2 O) 4 ]·2H 2 O} n ( 1 ), [Ni(H 2 DCP)(1,4-bidb) 2 (H 2 O)] n ( 2 ), [Co 2 (DCP)(1,3-bib)] n ( 3 ), {[Co 2 (DCP)(1,4-bidb) 2 ]·2H 2 O} n ( 4 ), [Co(H 2 DCP)(4,4′-bibp)] n ( 5 ), and [Co 2 (DCP)(4,4′-bibp) 2 ] n ( 6 ), were synthesized under hydrothermal conditions in the presence of bis(imidazole) bridging linkers (1,3-bib = 1,3-bis(imidazol-1-yl)benzene, 1,4-bib = 1,4-bis(imidazol-1-yl)benzene, 1,4-bidb = 1,4-bis(imidazol-1-yl)-2,5-dimethyl benzene, 4,4′-bibp = 4,4′-bis(imidazol-1-yl)biphenyl). Their structures have been determined by single-crystal X-ray diffraction analysis and further characterized by elemental analysis, IR spectra, powder X-ray diffraction (PXRD), and thermogravimetric (TG) analysis. Single crystal X-ray diffraction analysis reveals that complex 1 is a cocrystal consisting of two independent chains. Complex 2 exhibits a traditional 2-fold 6 6 - dia parallel entangled network. Complex 3 displays a novel 3D binodal (5,7)-connected net based on binuclear {Co 2 } units with the Schläfli symbol (3·4 4 ·5 4 ·6)(3 2 ·4 8 ·5 8 ·6 3 ). Complex 4 shows a 2-fold binodal (4,4)-connected bbf net with the point symbol (6 4 ·8 6 )(6 6 ) 2 . Complex 5 affords a 2D (4 4 ·6 2 )- sql net constructed from {Co 2 } dinuclear units. Complex 6 displays a novel (3,8)-connected architecture with the Schläfli point symbol (4 2 ·5) 2 (4 4 ·5 10 ·6 8 ·7 4 ·8 2 ) based on {Co 4 (COO) 6 } SBUs. Magnetic studies indicate complexes 3 and 6 exhibit weak ferromagnetic and antiferromagnetic properties, respectively.