Two novel Anderson-type polyoxometalate-based metal–organic complexes with high-efficiency photocatalysis towards degradation of organic dyes under UV and visible light irradiation

• Published in: RSC advances 2015, Vol.5 (18), p.14020-14026
• Main Authors: Wang, Xiuli, Chang, Zhihan, Lin, Hongyan, Tian, Aixiang, Liu, Guocheng, Zhang, Juwen, Liu, Danna
• Format: Article
• Language: English
• Subjects: Chains; Degradation; Diffraction; Ligands; Photocatalysis; Single crystals; Thermogravimetric analysis; X-rays
• ISSN: 2046-2069; 2046-2069
• DOI: 10.1039/C4RA15608K

Two novel Anderson-type polyoxometalate (POM)-based metal–organic complexes (MOCs), namely, H{CuL 0.5 1 [CrMo 6 (OH) 6 O 18 ](H 2 O)}·0.5L 1 ( 1 ) and {Cu 2 (L 2 ) 2 [CrMo 6 (OH) 5 O 19 ](H 2 O) 2 }·2H 2 O ( 2 ) (L 1 = N , N ′-bis(3-pyridinecarboxamide)-1,2-ethane, L 2 = N , N ′-bis(3-pyridinecarboxamide)-1.3-propane), were hydrothermally synthesized and structurally characterized by single-crystal X-ray diffraction, IR spectra, powder X-ray diffraction (PXRD) and thermogravimetric analyses (TGA). In complex 1 , the bidentate [CrMo 6 (OH) 6 O 18 ] 3− (CrMo 6 ) polyoxoanions bridge the Cu II ions to generate a 1D Cu–CrMo 6 inorganic chain, which is further connected by the μ 2 -bridging L 1 ligands to form a 1D ladder-like chain. Complex 2 is a 3D POM-based metal–organic framework exhibiting a {4 12 .6 3 } topology, which is constructed from the quadridentate CrMo 6 polyoxoanions and μ 2 -bridging L 2 ligands. The flexible bis-pyridyl-bis-amide ligands with different spacer lengths have a significant effect on the final structures. In addition, pH shows great influence on the formation of the single-crystal phase. The photocatalytic activities of the title complexes on the degradation of methylene blue (MB) and rhodamine B (RhB) under UV and visible light have been investigated in detail.