Syntheses, topologies, and luminescence of four Ln–organic polymers constructed from aromatic tetracarboxylic acids

• Published in: CrystEngComm Vol. 16; no. 39; pp. 9191 - 9197
• Main Authors: Fan, Liming, Fan, Weiliu, Song, Weikuo, Liu, Guangzeng, Zhang, Xiutang, Zhao, Xian
• Format: Journal Article
• Language: English
• Published: 01.01.2014
• Subjects: Construction; Diffraction; Luminescence; Oxalic acid; Spectra; Three dimensional; Topology; X-rays
• ISSN: 1466-8033; 1466-8033
• DOI: 10.1039/C4CE01139B

Four new coordination polymers (CPs), {[H 2 N(CH 3 ) 2 ] 2 [Ln 2 (BPT)(ox) 2 ]} n (Ln = Er for 1 , Yb for 2 , and Sm for 3 ; H 2 ox = oxalic acid) and {[Gd(HDCP)(H 2 O)]·H 2 O} n ( 4 ), have been constructed from Ln ions and two aromatic tetracarboxylate acids (H 4 BPT = 3,3′,5,5′-biphenyltetracarboxylic acid, H 4 DPT = 4,5-di(4′-carboxylphenyl)phthalic acid) under solvothermal reactions through the linker extension strategy. 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. Complexes 1–3 are isomorphous and exhibit an unprecedented (6,8)-connected 3D architecture with a point symbol of (3 3 ·4 10 ·5 7 ·6 2 ·7 6 )(3 3 ·4 6 ·5 6 ) 2 , which is built up from right- and left-handed [Ln(ox)] n helixes. Complex 4 shows a 3D (4,8)-connected flu net with (4 12 ·6 12 ·8 4 )(4 6 ) 2 topology based on 1D [Gd(COO) 2 ] n ladder chains. Moreover, their luminescence properties have been investigated.