1. Hydrothermal synthesis and structural characterization of metal–organic frameworks based on new tetradentate ligands.
- Author
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Liang, Yue, Yuan, Wei-Guan, Zhang, Shu-Fang, He, Zhan, Xue, Junru, Zhang, Xia, Jing, Lin-Hai, and Qin, Da-Bin
- Subjects
LIGANDS (Chemistry) ,CADMIUM compounds synthesis ,PHTHALIC acid ,BENZOIC acid ,PHENYL compounds - Abstract
The hydrothermal reaction of two new tetradentate ligands with different metal salts of cadmium nitrate, zinc chloride, cobalt nitrate and deprotonated terephthalic acid (H
2 tp), isophthalic acid (H2 ip), 4,4′-oxybisbenzoic acid (H2 obba) in H2 O/DMF or H2 O/methanol gave three metal–organic frameworks (MOFs): {[Zn2 (L1)(tp)(formate)2 ]·H2 O}n (1), {[Cd2 (L2)(ip)2 ]·2H2 O}n (2), {[Co2 (L2)(obba)2 ]}n (3) (L1 = 1,2-bis {2,6-bis [(1H-imidazol-1-yl) methyl]-4-methylphenoxy} ethane, L2 = 1,3-bis {2,6-bis [(1H-imidazol-1-yl) methyl]-4-methylphenoxy} propane). The structures of the frameworks are established by single-crystal X-ray diffraction. Compound 1 is a three-dimensional (3D) framework with a 2-fold interpenetrated form, which exhibits a 2-nodal (3,4)-connected fsh-3,4-P21 /c net with a {83 }2 {85 ·10} topology. Compound 2 has a 2-nodal (4,8)-connected 3D framework where the dinuclear cadmium cluster secondary building units (SBUs) assemble with isophthalate and ligand L2 to construct a rare topological type sqc22 net with a {32 ·54 }{34 ·44 ·510 ·610 } topology. Whereas, Compound 3 can be extended to a 2D interlocked (4,4)-connected 4,4 L28 net with the point symbol {4·64 ·8}2 {42 ·64 }. L1 and L2 are tetradentate ligands with diverse linkers and display different coordination modes. In addition, the thermal stability and photochemical properties of the frameworks are also investigated. [ABSTRACT FROM AUTHOR]- Published
- 2016
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