Three New Polycatenation Networks Based on 4,4′-Oxybis(benzoate) and Bis(imidazole) Ligands: Synthesis, Structure and Photoluminescence

• Published in: European Journal of Inorganic Chemistry 2010-12, Vol.2010 (34), p.5478-5483
• Main Authors: Xu, Yun, Chen, Pang-Kuan, Che, Yun-Xia, Zheng, Ji-Min
• Format: Article
• Language: English
• Subjects: Luminescence; Metal-organic frameworks; Polycatenation; Structure elucidation
• ISSN: 1434-1948; 1099-0682
• DOI: 10.1002/ejic.201000832

In this paper we report three new metal–organic frameworks (MOFs), [Zn(oba)(L1)0.5(H2O)]n (1), [Zn2(oba)2(L2)2](H2O)3 (2) and [Co(oba)(L1)]n (3) [oba = 4,4′‐oxybis(benzoate), L1 = 1,4‐bis(imidazol‐1‐ylmethyl)benzene, L2 = 1,4‐bis(imidazol‐1‐yl)benzene] that have been obtained under hydrothermal conditions and characterized by single‐crystal X‐ray diffraction, powder X‐ray diffraction (PXRD), infrared spectroscopy (IR), thermogravimetric analysis (TGA) and elemental analysis (EA). A structural investigation revealed that all three coordination compounds present polycatenation features. Interestingly, 1 shows a rare 1D → 2D structure formed by the catenation of 1D ladders. Both 2 and 3, however, are unusual cases that have 3D frameworks constructed from 2D 44‐sql layers by parallel polycatenation. The photoluminescence properties of 1 and 2 have also been investigated. Three new polycatenation networks have been prepared. Interestingly, compound 1 represents a rare 1D → 2D polycatenation formed by the catenation of 1D ladders and compounds 2 and 3 are uncommon 2D → 3D frameworks formed by parallel polycatenation of 2D (4,4) sheets.