ic301257k_si_002.cif (124.62 kB)
Four New Three-Dimensional Polyoxometalate-Based Metal–Organic Frameworks Constructed From [Mo6O18(O3AsPh)2]4– Polyoxoanions and Copper(I)-Organic Fragments: Syntheses, Structures, Electrochemistry, and Photocatalysis Properties
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posted on 2013-01-07, 00:00 authored by Bo Liu, Jin Yang, Guo-Cheng Yang, Jian-Fang MaFour novel polyoxometalate-based copper(I)-organic frameworks,
namely, [CuI2(cis-L1)2][CuI2(trans-L1)2Mo6O18(O3AsPh)2] (1), [CuI4(L2)4Mo6O18(O3AsPh)2] (2),
[CuI4(L3)4Mo6O18(O3AsPh)2] (3), and [CuI4(L4)2Mo6O18(O3AsPh)2] (4) (L1 = 1,3-bis(1,2,4-triazol-1-yl)propane,
L2 = 1,4-bis(1,2,4-triazol-1-yl)butane, L3 = 1,5-bis(1,2,4-triazol-1-yl)pentane,
and L4 = 1,6-bis(1,2,4-triazol-1-yl)hexane), have been successfully
synthesized under hydrothermal conditions. Their structures have been
determined by single-crystal X-ray diffraction analyses and further
characterized by elemental analyses, infrared spectra (IR), UV–vis
spectra, powder X-ray diffraction (PXRD), and thermogravimetric (TG)
analyses. Compound 1 is composed of two crystallographically
independent and distinct polymeric motifs: one-dimensional (1D) S-shaped
chain and two-dimensional (2D) undulated layer. The S-shaped chains
penetrated into the 2D parallel layers to generate an unusual 1D +
2D → three-dimensional (3D) polypseudo-rotaxane
framework. In 2, the As2Mo6 polyoxoanions
in tetradentate modes link four neighboring −L2–Cu–L2–
chains to produce a rare 3D trinodal (3,4)-connected self-penetrated
framework with Point Symbol of (83)2(82·124). In 3, adjacent CuI atoms are linked by As2Mo6 polyoxoanions and
L3 ligands into a 2D layer. The layers are further interlocked by
the two nearest neighboring ones to form a 3D polycatenated framework.
In 4, L4 ligands bridge four CuI atoms to
yield 2D wavelike layers, which are further linked by the octadentate
As2Mo6 polyoxoanions to form a 3D tetranodal
(3,4,6)-connected framework with Point Symbol of (63)(4·63·82)(64·82)(42·62·810·10). In addition,
the photocatalytic activities of compounds 1, 3, and 4 for decomposition of methylene blue (MB) under UV light have been investigated. Moreover, their electrochemical
properties have also been studied in 1 M H2SO4 aqueous solution.