Two new three-dimensional metal–organic frameworks with 4-connected diamondoid and unusual (6, 16)-connected net topologies based on planar tetranuclear squares as secondary building units. Issue 7 (25th January 2016)

• Record Type: Journal Article
• Authors: Cai, Song-Liang; Zheng, Sheng-Run; Fan, Jun; Zeng, Rong-Hua; Zhang, Wei-Guang
• Is Part Of: CrystEngComm. Volume 18:Issue 7(2016)
• Page Start: 1174
• Page End: 1183
• Publication Date: 2016-01-25
• Subjects: Crystals -- Periodicals; Crystal growth -- Periodicals; Crystallography -- Periodicals; Cristaux -- Périodiques; Cristaux -- Croissance -- Périodiques; Cristallographie -- Périodiques; 548
• DOI: 10.1039/c5ce02138c
• Languages: English
• ISSNs: 1466-8033

Abstract

Abstract : Two new 3D MOFs have been successfully constructed by using planar tetranuclear squares as SBUs. Abstract : Solvothermal reactions of Co 2+ and Mn 2+ salts with 2-(trifluoromethyl)-1 H -4, 5-imidazole dicarboxylic acid (H3 TFMIDC) lead to two novel three-dimensional (3D) metal–organic frameworks (MOFs), namely, [Co6 (μ3 -TFMIDC)4 (H2 O)12 ]·15H2 O (1 ) and [(Me2 NH2 )3 ][MnII6 Mn III (μ3 -TFMIDC)6 (H2 O)6 ]·18H2 O (2 ). Single-crystal X-ray diffraction analysis reveals that both of them are based on interesting planar tetranuclear squares [M4 (TFMIDC)4 ] as secondary building units (SBUs). Compound1 exhibits a unique 3D two-fold interpenetrated network with the diamondoid topology consisting of the tetranuclear square SBUs as 4-connected nodes, while compound2 features an unusual (6, 16)-connected 3D framework based on the novel tetranuclear square SBUs as 16-connected nodes and trivalent manganese ions as 6-connected nodes, representing the first 16-connected MOF utilizing planar tetranuclear square SBUs as building blocks. Our results open up new perspectives to design novel 3D extended MOFs, especially the unique highly connected 3D MOFs by employing planar tetranuclear square SBUs. Moreover, IR spectroscopy, powder X-ray diffraction, thermogravimetric analyses, and a study on the magnetic properties of both compounds, have been also performed.