Hydrothermal syntheses and structural characterizations of three polyoxomolybdates frameworks linked by M(HL)2 units (M = Co, Ni, Zn; L = 3-(2-pyridyl)pyrazole)

Zhang, XiuTang; Wu, Xiao‐Yuan; Sun, Daofeng; Wei, Peng; Ni, Zhong‐Hai; Dou, Jianmin; Li, DaCheng; Shi, Congwen; Hu, Bo

doi:10.1007/s11426-010-4018-8

Sci. China Chem.

2010

DOI: 10.1007/s11426-010-4018-8

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Hydrothermal syntheses and structural characterizations of three polyoxomolybdates frameworks linked by M(HL)2 units (M = Co, Ni, Zn; L = 3-(2-pyridyl)pyrazole)

XiuTang Zhang

Xiao‐Yuan Wu

Daofeng Sun

et al.

Abstract: Three polyoxomolybdate compounds, namely {[M II (HL) 2 ] 2 (Mo 8 O 26 )} n (M = Co (1), Ni (2), Zn (3)) (HL, 3-(2-pyridyl)pyrazole), were designed and synthesized under the hydrothermal conditions and characterized by elemental analysis, IR spectroscopy, and TGA. Single-crystal X-ray diffraction analysis results reveal that compounds 1-3 own the isostructural chain structure consisting of the -[Mo 8 O 26 ] 4 anions, which are linked by M(HL) 2 2+ units via the terminal oxygen atoms. TGA curves show that the … Show more

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A spectroscopic study on the coordination and solution structures of the interaction systems between biperoxidovanadate complexes and the pyrazolylpyridine-like ligands

Deng

Zheng

et al. 2014

Dalton Trans.

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In order to understand the substitution effects of pyrazolylpyridine (pzpy) on the coordination reaction equilibria, the interactions between a series of pzpy-like ligands and biperoxidovanadate ([OV(O2)2(D2O)](-)/[OV(O2)2(HOD)](-), abbrv. bpV) have been explored using a combination of multinuclear ((1)H, (13)C, and (51)V) magnetic resonance, heteronuclear single quantum coherence (HSQC), and variable temperature NMR in a 0.15 mol L(-1) NaCl D2O solution that mimics the physiological conditions. Both the direct NMR data and the equilibrium constants are reported for the first time. A series of new hepta-coordinated peroxidovanadate species [OV(O2)2L](-) (L = pzpy-like chelating ligands) are formed due to several competitive coordination interactions. According to the equilibrium constants for products between bpV and the pzpy-like ligands, the relative affinity of the ligands is found to be pzpy > 2-Ester-pzpy ≈ 2-Me-pzpy ≈ 2-Amide-pzpy > 2-Et-pzpy. In the interaction system between bpV and pzpy, a pair of isomers (Isomers A and B) are observed in aqueous solution, which are attributed to different types of coordination modes between the metal center and the ligands, while the crystal structure of NH4[OV(O2)2(pzpy)]·6H2O (CCDC 898554) has the same coordination structure as Isomer A (the main product for pzpy). For the N-substituted ligands, however, Isomer A or B type complexes can also be observed in solution but the molar ratios of the isomer are reversed (i.e., Isomer B type is the main product). These results demonstrate that when the N atom in the pyrazole ring has a substitution group, hydrogen bonding (from the H atom in the pyrazole ring), the steric effect (from alkyl) and the solvation effect (from the ester or amide group) can jointly affect the coordination reaction equilibrium.

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A spectroscopic study on the coordination and solution structures of the interaction systems between biperoxidovanadate complexes and the pyrazolylpyridine-like ligands

Deng

Zheng

et al. 2014

Dalton Trans.

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A highly photocatalytic polyoxomolybdate compound constructed from novel-type triple helix {Mo4O12}n chains and copper(i)–organic nets

et al. 2013

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A novel-type 3D polyoxomolybdate-organic framework, {[Cu3(H3tpb)2(tpb)(Mo4O12)]·4H2O}n (1, H3tpb = 1,3,5-tri(1H-pyrazol-3-yl)benzene), was prepared and characterized by elemental analysis, IR spectroscopy, and luminescence analysis. Single-crystal X-ray diffraction analysis reveals that novel neutral triple helix {Mo4O12}n chains are encased in bowl-like 2D [Cu3(H3tpb)2(tpb)]n intervals via bond interactions between terminal oxygen atoms and cations of Cu(I), leaving an unprecedented (3,3,5,8)-connected (3·4·6(8))3(3(6)·4(6)·8(6)·9(6)·10(4))(4(3))2(6(3)) topology. Moreover, compound 1 exhibits remarkable photocatalytic activities for decomposition of methylene orange (MO), methylene red (MR), methylene blue (MB), methylene violet (MV), and rhodamine B (RhB) under UV light.

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Hydrothermal syntheses and structural characterizations of three polyoxomolybdates frameworks linked by M(HL)2 units (M = Co, Ni, Zn; L = 3-(2-pyridyl)pyrazole)

Cited by 2 publications

References 28 publications

A spectroscopic study on the coordination and solution structures of the interaction systems between biperoxidovanadate complexes and the pyrazolylpyridine-like ligands

A spectroscopic study on the coordination and solution structures of the interaction systems between biperoxidovanadate complexes and the pyrazolylpyridine-like ligands

A highly photocatalytic polyoxomolybdate compound constructed from novel-type triple helix {Mo4O12}n chains and copper(i)–organic nets

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