Through utilizing pendant 2-[1,2,4]triazol-4-yl-ethylamine (tea) and two kinds of bis(pyrazol) ligand, five new polyoxometalate (POM)-based compounds [Cu₃K₂(tea)₂(OH)₄(H₂Mo₈O₂₇)] (1), [Ag(tea)(β-H₂Mo₈O₂₆)_0.5] (2), [Ag(tea)(H₂O)(γ-H₂Mo₈O₂₆)_0.5] (3), [Cu(H₂bdpm)(β-Mo₈O₂₆)_0.5] (4) and [Ag₂(Hbhpe)(θ-Mo₈O₂₆)_0.5] (5) (H₂bdpm = 1,1′-bis(3,5-dimethyl-1H-pyrazol-4-yl)methane, H₂bhpe = 1,2-bis(1H-pyrazolate)ethane) were synthesized under hydrothermal conditions and characterized by single-crystal X-ray diffraction. In compound 1, three Cu^II are fused by two tea and two OH⁻ moieties to form a tri-nuclear cluster [Cu₃(tea)₂(OH)₂]⁴⁺. The Mo₈ anions link each other through sharing terminal O atoms to build an Mo-chain. The tri-nuclear clusters are further connected by an Mo-chain and K⁺ ions to form a 3D framework. In compound 2, two Ag⁺ ions are fused by two tea ligands to construct a bi-nuclear subunit, which are linked by β-Mo₈ anions alternately to form a 1D chain. In compound 3, there exists a bi-nuclear Ag⁺ cluster [Ag₂(tea)₂]²⁺. The γ-Mo₈ anions link bi-nuclear Ag⁺ clusters alternately and a 1D chain is constructed. Furthermore, each [Ag₂(tea)₂]²⁺ offers two additional N donors to connect two anions through Mo–N bonds. In compound 4, two 1D zigzag Cu–H₂bdpm chains cover one 1D inorganic Mo-chain up and down to build a “hamburger-like” chain. The adjacent hamburger chains share the same Cu atoms to build a 2D structure. In compound 5, there exists a bi-nuclear [Ag₂(Hbhpe)₂]²⁺ cycle and a tetra-nuclear [Ag₄(Hbhpe)₄]⁴⁺ cycle. The bi-nuclear cycles and tetra-nuclear cycles alternately connect to form 1D metal–organic chains, which are further linked by θ-Mo₈ anions to construct a 2D layer. The electrochemical and photocatalytic properties of compounds 1–5 are studied.

中文翻译：

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2- [1,2,4]三唑-4-基乙胺侧基和对称的双（吡唑）配体对基于POM的化合物的尺寸扩展的影响†

通过利用2- [1,2,4]三唑-4-基乙胺侧基（茶）和两种双（吡唑）配体，得到五种新的基于多金属氧酸盐（POM）的化合物[Cu ₃ K ₂（茶）₂（OH）₄（H ₂沫₈ ø ₂₇）]（1）和[Ag（茶）（β-H ₂沫₈ ö ₂₆）_0.5（2），将[Ag（茶）（H ₂ O）（γ -H ₂沫₈ ö ₂₆）_0.5（3），[铜（H ₂ bdpm）（β-沫₈ ö ₂₆）_0.5 ]（ 4）和将[Ag ₂（Hbhpe）（θ-沫₈ ö ₂₆） _0.5（ 5）（H ₂ bdpm = 1,1'-双（3,5-二甲基-1- ħ吡唑-4-在水热条件下合成H ₂ bhpe = 1,2-双（1 H-吡唑酸酯）乙烷基）甲烷，并通过单晶X射线衍射进行表征。在化合物1，3的Cu ^II由两个茶和两个稠合的OH ^-基团，以形成一个三核簇[铜₃（TEA） ₂（OH） ₂ ] ⁴⁺。莫₈阴离子通过共享末端的O原子彼此连接，从而建立Mo链。三核簇进一步通过Mo链和K ⁺离子连接以形成3D框架。在化合物2中，两个的Ag ⁺离子被两个茶配体融合构建的双核亚基，其由β-沫挂_8个阴离子交替以形成一维链。在化合物3中，存在双核Ag ⁺簇[Ag ₂（tea）₂ ] ²⁺。所述γ-沫₈阴离子链接双核的Ag ⁺交替簇和一维链构造。此外，每个[Ag ₂（tea）₂] ²⁺提供两个额外的N供体，以通过Mo-N键连接两个阴离子。在化合物4中，两条1D之字形Cu–H ₂ bdpm链上下覆盖一条1D无机Mo链以构建“汉堡状”链。相邻的汉堡链共享相同的Cu原子以构建2D结构。在化合物5中，存在双核[Ag ₂（Hbhpe）₂ ] ²⁺循环和四核[Ag ₄（Hbhpe）₄ ] ⁴⁺循环。该双核周期和四核周期交替地连接，以形成一维的金属-有机链，这是由θ-沫进一步连接₈阴离子以构建2D层。研究了化合物1-5的电化学和光催化性能。