Four octamolybdate complexes constructed from a quinoline–imidazole–monoamide ligand: structures and electrochemical, photocatalytic and magnetic properties,CrystEngComm

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Four octamolybdate complexes constructed from a quinoline–imidazole–monoamide ligand: structures and electrochemical, photocatalytic and magnetic properties
CrystEngComm ( IF 2.6 ) Pub Date : 2020-10-28 , DOI: 10.1039/d0ce01239d
Lei Li _{1,

2,

3,

4,

5} , Xiang Wang _{1,

2,

3,

4,

5} , Na Xu _{1,

2,

3,

4,

5} , Zhihan Chang _{1,

2,

3,

4,

5} , Guocheng Liu _{1,

2,

3,

4,

5} , Hongyan Lin _{1,

2,

3,

4,

5} , Xiuli Wang _{1,

2,

3,

4,

5}

Affiliation

By introducing a quinoline–imidazole–monoamide ligand, N-(quinoline-5-yl)-1H-imidazole-4-carboxamide (L), into reaction systems containing a [Mo₇O₂₄]⁶⁻ polyoxoanion and different metal ions, four octamolybdate-based complexes with the general formula of [M(HL)₂(β-Mo₈O₂₆)] (M = Co (1), Ni (2), and Zn (3)) and [Cu₂(HL)₂(μ₂-OH)₂(β-Mo₈O₂₆)] (4) have been hydrothermally synthesized. All the complexes are 2D supramolecular structures with 1D chains based on the [β-Mo₈O₂₆]⁴⁻ polyoxoanion. Complexes 1–3 are isostructural with the same architectural feature of a mononuclear [M(HL)₂]⁴⁺ unit, but a binuclear [Cu₂(HL)₂(μ₂-OH)₂]⁴⁺ cation in complex 4, manifesting that the metal cation has a marked impact on the structures of 1–4. Meanwhile, the hydrogen bonding interaction between the protonated nitrogen atom of quinoline and the surface oxygen atom of the polyoxoanion demonstrates a crucial role in the formation of the supramolecular structure. All the complexes have better electrocatalytic activities, including not only the reduction properties of inorganic bromate, nitrite and hydrogen peroxide, but also the oxidation properties of ascorbic acid. In particular, 2-CPE can sense bromate and ascorbic acid with low detection limits of 1.67 and 6 μM. Both complexes 1 and 4 possess better photocatalytic properties for degrading organic dyes gentian purple and methylene blue, but only methylene blue for 3, accompanied by a weak antiferromagnetic behavior for complex 4.

中文翻译：

由喹啉-咪唑-单酰胺配体构成的四种八钼酸盐络合物：结构和电化学，光催化和磁性能

通过将喹啉-咪唑-单酰胺配体N-（喹啉-5-基）-1 H-咪唑-4-羧酰胺（L）引入含有[Mo ₇ O ₂₄ ] ^6-聚氧阴离子和不同金属离子的反应体系中，四个基于八钼酸铵的络合物与通式[M（HL）₂（β-沫₈ ö ₂₆）]（M = CO（1），镍（2），和Zn（3））和[铜₂（ HL）₂（μ ₂ -OH）₂（β-沫₈ ö ₂₆）]（4）已水热合成。所有的配合物是基于所述[β-Mo系与一维链2D超分子结构₈ ö ₂₆ ] ^4-氧阴离子。络合物1-3是具有单核的相同的体系结构特征等结构的[M（HL）₂ ] ⁴⁺单元，但双核物[Cu ₂（HL）₂（μ ₂ -OH）₂ ] ⁴⁺阳离子络合物4，表明金属阳离子对1-4的结构有显着影响。同时，喹啉的质子化氮原子与聚氧阴离子表面氧原子之间的氢键相互作用显示出在超分子结构形成中的关键作用。所有的配合物都具有更好的电催化活性，不仅包括无机溴酸盐，亚硝酸盐和过氧化氢的还原性能，还包括抗坏血酸的氧化性能。特别是2 -CPE可以检测到1.67和6μM的低检测限的溴酸盐和抗坏血酸。配合物1和4都具有较好的光催化性能，可降解有机染料龙胆紫和亚甲基蓝，但仅亚甲基蓝可降解3，伴随着弱的复杂的反铁磁行为4。

更新日期：2020-11-19

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