Metal-organic frameworks based on tetra(imidazole) and multicarboxylate: Syntheses, structures, luminescence, photocatalytic and sonocatalytic degradation of methylene blue

• Published in: Polyhedron Vol. 197; p. 115052
• Main Authors: Tian, Hai-Xin, Zha, Miao, Ma, Li-Xiao, Zhou, Wen-Jing, Li, Bao-Long, Wu, Bing
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 15.03.2021
• Subjects: Luminescence; Metal-organic networks; Photocatalyst; Structure; Tetra(imidazole); Metal-organic networks; Structure; Photocatalyst; Luminescence; Tetra(imidazole)
• ISSN: 0277-5387
• DOI: 10.1016/j.poly.2021.115052

Two MOFs exhibit the (3,4,4,6)-connected and (4,4)-connected 3D topology, strong luminescence and good photocatalytic and sonocatalytic activities for degradation of methylene blue. [Display omitted] Two Zn MOFs {[Zn4(OH)(tipe)2(btc)2]·(OH)·9H2O·DMF}n (1·(OH)·9H2O·DMF) and {[Zn(tipe)1/2(bpdc)]·H2O}n (2·H2O) (tipe = 1,1,2,2-tetrakis(imidazol-1-yl)phenyl)ethylene, btc = 1,3,5-benezenetricarboxylate, bpdc = 2,2′-biphenyldicarboxylate) were obtained using the hydrothermal method and characterized. MOF 1 exhibits the (3,4,4,6)-connected 3D topology with point symbol of (83)(44·82)(4·84·12)(42·89·102·122). MOF 2 shows the (4,4)-connected 3D topology with point symbol of (84·102)2(42·82·102). MOF 1 and 2 present the strong luminescence emission at 507 nm and 492 nm, respectively. The energy gap (Eg), valence band (Ev) and conduction band (Ec) data of MOF 1 and 2 were 2.31 and 2.17 eV, 2.37 and 2.54 eV, 0.06 and 0.37 eV, respectively. MOF 1 and 2 are good photocatalytic and sonocatalytic catalysts for degradation of methylene blue under visible light and ultrasound irradiation. The catalytic mechanism was proposed.