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- Title
New Entangled Coordination Networks Based on Charge-Tunable Keggin-Type Polyoxometalates.
- Authors
Hao, Xiu ‐ Li; Ma, Yuan ‐ Yuan; Wang, Yong ‐ Hui; Xu, Long ‐ Yang; Liu, Fu ‐ Chen; Zhang, Mao ‐ Mao; Li, Yang ‐ Guang
- Abstract
Investigation into a hydrothermal reaction system with transition-metal (TM) ions, 1,4-bis(1,2,4-triazol-1-lmethyl)benzene (BBTZ) and various charge-tunable Keggin-type polyoxometalates (POMs) led to the preparation of four new entangled coordination networks, [CoII(HBBTZ)(BBTZ)2.5][PMo12O40] ( 1), [CuI(BBTZ)]5[BW12O40] ⋅H2O ( 2), [CuII(BBTZ)]3[AsWV3WVI9O40] ⋅10 H2O ( 3), and [CuII5(BBTZ)7(H2O)6][P2W22Cu2O77(OH)2] ⋅6 H2O ( 4). All compounds were characterized by using elemental analysis, IR spectroscopy, thermogravimetric analysis, powder X-ray diffraction, and single-crystal X-ray diffraction. The mixed valence of W centers in compound 3 was further confirmed by using XPS spectroscopy and bond-valence sum calculations. In the structural analysis, the entangled networks of 1- 4 demonstrate zipper-closing packing, 3D polythreading, 3D polycatenation, and 3D self-penetration, respectively. Moreover, with the enhancement of POM negative charges and the use of different TM types, the number of nodes in the coordination networks of 1- 4 increased and the basic metal-organic building motifs changed from a 1D zipper-type chain (in 1) to a 2D pseudorotaxane layer (in 2) to a 3D diamond-like framework (in 3) and finally to a 3D self-penetrating framework (in 4). The photocatalytic properties of compounds 1- 4 for the degradation of methylene blue under UV light were also investigated; all compounds showed good catalytic activity and the photocatalytic activity order of Keggin-type species was initially found to be {XMo12O40}>{XW12O40}>{XW12− nTM nO40}.
- Subjects
KEGGIN anions; POLYOXOMETALATES; TRANSITION metals; COORDINATION compounds; THERMOGRAVIMETRY; X-ray diffraction
- Publication
Chemistry - An Asian Journal, 2014, Vol 9, Issue 3, p819
- ISSN
1861-4728
- Publication type
Article
- DOI
10.1002/asia.201301378