Co-MOFs Containing Flexible [alpha],[omega]-Alkane-dicarboxylates and Bis(imidazole) Ligands: Synthesis, Structure, and Properties

• Published in: Zeitschrift für anorganische und allgemeine Chemie (1950) 2015-06, Vol.641 (7), p.1247
• Main Authors: Gong, Ya-Qiong, Jia, Hong-Yun, Zhang, Shu-Hai
• Format: Article
• Language: eng ; ger
• ISSN: 0044-2313; 1521-3749
• DOI: 10.1002/zaac.201500091

Three structurally related flexible bis(imidazole) ligands reacted with Co(NO3)2·6H2O and succinic acid (L1) to yield three new metal-organic frameworks {[Co(L1)(L2)]·(H2O)}n (1) [L2 = 2-bis(imidazol-1-yl)ethane], {[Co(L1)(L3)](H2O)}n (2) [L3 = 1,4-bis(imidazol-1-yl) butane], and {[Co(L1)(L4)]·(H2O)}n (3) [L4 = 1,4-bis(2-methyl-imidazol-1-yl)butane], respectively. These complexes were synthesized under solvothermal conditions and characterized by elemental analysis, IR spectroscopy, single-crystal and powder X-ray diffraction, as well as thermal analyses. Interestingly, the ligands in these complexes exhibit different conformations and further cause three different configurations. Complex 1 shows a three-dimensional (3D) framework, which is connected by two-dimensional (2D) layer structures through hydrogen bonds. Complex 2 is a diamond structure with threefold interpenetration. Complex 3 is a 3D framework linked by hydrogen bonds like complex 1.