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Two polymolybdate-based complexes and their graphene composites with visible-light photo-responses

机译：两种基于聚合物的聚合物及其具有可见光的光响应的石墨烯复合材料

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Two polymolybdate-based complexes formulated as (H _(2) L1) _(2) (Mo _(4) O _(13) ) ( 1 ) and (L2) _(2) (HL2) _(2) (Mo _(8) O _(25) )·7H _(2) O ( 2 ) have been hydrothermal synthesized and structurally characterized by single-crystal X-ray diffraction. In complex 1 , one-dimensional (1D) [Mo ~(V) _(4) Mo ~(VI) _(4) O _(26) ] _(∞) ~(8?) chain is constructed by vertice-sharing {MoO _(6) } octahedra, and the uncoordinated protonated [H _(2) L1] ~(2+) species link different [Mo _(8) O _(26) ] _(∞) ~(8?) chains via supramolecular forces. In complex 2 , the [Mo _(8) O _(25) ] ~(2?) moieties are linked by the μ _(3) -[HL2] ~(+) and μ _(2) -L2 ligands into 1D chain. Complex 2 possesses more narrow band gap than complex 1 , and it shows stronger photocurrent response than complex 1 under the visible light (650 nm > λ > 350 nm). The different densities of states (DOS) of the two complexes are attributed to their different compositions and frameworks, thus giving rise to their different band gaps. With the addition of graphene into the two complexes, the electroconductivity of the complex/graphene composite material is much improved, and 2 /graphene composite material shows much improved electrocatalytic activity for the H _(2) evolution reaction (HER) than complex 2 .
机译：配制的两种基于聚合物的聚合物（H _（2）L1）_（2）（Mo _（4）O _（13））（1）和（L2）_（2）（HL2）_（2）（ Mo _（8）o _（25））·7h _（2）o（2）已在单晶X射线衍射中合成和结构表征。在复杂的1中，一维（1D）[Mo〜（V）_（4）Mo〜（Vi）_（4）o _（26）] _（∞）〜（8？）链由virece构成 - 分享{moo _（6）} octahedra，并且未协调的质子化[h _（2）l1]〜（2+）物种链接不同[mo _（8）o _（26）] _（∞）〜（8？ ）通过超分子力的链。在复合物2中，通过μ_（3） - [H12]〜（+）和μ_（2）-L2配体连接到[Mo _（8）O _（25）]〜（2？）部分。 1D链。复合物2比复合物1具有更窄的带隙，并且它在可见光（650nm>λ> 350nm）下方显示比复合物1更强的光电流响应。两种复合物的状态（DOS）的不同密度归因于其不同的组成和框架，从而产生了它们不同的带隙。随着石墨烯进入两种络合物，复合/石墨烯复合材料的导电性很大，2 /石墨烯复合材料显示出比复合物2的H _（2）进化反应（2）的电催化活性大大提高了电催化活性。

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