Three new POM-based coordination polymers with 1,3,5-tris(1-imidazolyl)benzene ligand: syntheses, structures and proton conductivity

• Published in: CrystEngComm 2022-02, Vol.24 (8), p.1556-1563
• Main Authors: Chen, Lin-Lin, Shi, Ya-Jie, Wu, Wen-Wen, Wang, Jia-Xin, Li, Ya-Min, Bai, Yan, Dang, Dong-Bin
• Format: Article
• Language: English
• Subjects: Antiferromagnetism; Benzene; Coordination polymers; Hydrocarbons; Hydrogen bonding; Ligands; Protons; Topology; Water chemistry
• ISSN: 1466-8033; 1466-8033
• DOI: 10.1039/D2CE00061J

Three new POM-based coordination polymers, [Cu(timb) 2 (W 6 O 19 )] n (1), {[Zn 3 (Htimb) 2 (H 2 timb) 2 (H 2 O) 2 (ZnW 12 O 40 ) 2 ]·2H 2 O} n (2), and {[Ni(Htimb)(H 2 O) 3 (H 2 W 12 O 40 ) 0.5 ]·3H 2 O} n (3) (timb = 1,3,5-tris(1-imidazolyl)benzene), have been prepared under hydrothermal conditions. Compound 1 contains one 3D framework constructed by Cu II atoms and timb ligands with a rare 3,6-connected pyr topology, while the polyoxoanions are situated in the cavities. For compound 2, the 3D framework is composed of a 2,4-connected network (A) and hcb network (B) in the BBABB mode. The 1D chains of compound 3 are arranged into a 3D framework by a variety of hydrogen bonding interactions between the [H 2 W 12 O 40 ] 6− polyoxoanions, coordinated water molecules and free water molecules. Magnetic data of compounds 1 and 3 show the presence of antiferromagnetic behavior. In addition, the highest proton conductivities of compounds 2 and 3 reach 2.32 × 10 −5 S cm −1 and 3.38 × 10 −5 S cm −1 at 358 K and 98% RH, respectively.