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Issue 28, 2016
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pH-Dependent assembly of three novel inorganic–organic hybrids based on different isopolymolybdates and CuI/II(bbx)n units

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Abstract

Three novel inorganic–organic hybrid compounds based on different types of isopolymolybdates and CuII(bbx) complexes, namely, [Cu2II(bbx)2(β-Mo8O26)]·2H2O (1), [Cu2II(bbx)4(γ-Mo8O26)] (2) and H2[Cu2I(bbx)2(Mo2O8)] (3) (bbx = 1,3-bis(1-imidazolyl)benzene), have been successfully synthesized by adjusting the pH value under hydrothermal conditions. Compound 1, which was hydrothermally prepared at pH = 3.5, exhibits a unique 3D (2,5,6)-connected net with a (43·64·82·10)2(44·68·83)(4)2 topology, constructed by sexadentate Mo8O26)4− anions coordinated to CuII ions of one-dimensional [CuII(bbx)]n chains. When the pH value was adjusted to 4.5, a structurally different complex 2 was obtained. Compound 2 shows a 3D (2,5)-connected framework with an (86·124)2(8)5 topology, constructed by bidentate γ-(Mo8O26)4− polyanions linking 2D layers composed of [CuII(bbx)2]n. Moreover, when the pH value was adjusted to 7.5, an interesting complex 3 was obtained. Compound 3 shows a 2D (4)-connected framework with a (44·62) topology, constructed by bidentate (Mo2O8)4− polyanions linking [Cu2I(bbx)2]n ladder-like double-chains. The (Mo2O8)4− unit has never been observed before, which is composed of two rare distorted {MoO5} tetragonal pyramids connected via edge-sharing. All compounds were characterized by elemental analysis, TG analysis, powder X-ray diffraction, single-crystal X-ray diffraction analysis and solid diffuse reflectance spectroscopy. In addition, the electrochemical properties of compounds 1–3 have been investigated in 1 M H2SO4 aqueous solution. Moreover, compounds 1 and 3 have definite catalytic activities to activate peroxymonosulfate (PMS) in the reduction of methylene blue (MB).

Graphical abstract: pH-Dependent assembly of three novel inorganic–organic hybrids based on different isopolymolybdates and CuI/II(bbx)n units

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Article information


Submitted
06 Apr 2016
Accepted
19 May 2016
First published
19 May 2016

CrystEngComm, 2016,18, 5320-5326
Article type
Paper

pH-Dependent assembly of three novel inorganic–organic hybrids based on different isopolymolybdates and CuI/II(bbx)n units

P. Wu, Q. Xue, X. Dong, Y. Zhang, B. Liu, H. Hu and G. Xue, CrystEngComm, 2016, 18, 5320
DOI: 10.1039/C6CE00776G

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