Through tuning different kinds of polyoxometalates (POMs), four POM-based inorganicâorganic hybrid compounds with different dimensionalities, namely [(H2L)2(Mo8O26)] (1), [CuII2L6(P2W24O79)·4H2O]·7H2O (2), CuII2L2(μ2-OH)[CrMo6(OH)6O18]·4H2O}·4H2O (3), and CuI2CuII2L2(μ3-OH)2[CrMo6(OH)5O19]·6H2O}·4H2O (4) [L = 1,4-bis(3-pyridinecarboxamido)benzene], have been synthesized under hydrothermal conditions and characterized by IR spectroscopy, TG analysis, powder XRD and single-crystal X-ray diffraction. Single-crystal X-ray analyses reveal that compound 1 exhibits a two-dimensional (2D) supramolecular network, which is constructed from protonated L ligands and [Mo8O26]4â anions through hydrogen bonding interactions. Compound 2 is a 1D hybrid chain based on an uncommon inorganic [P2W24O79]4â chain and âYâ-shaped (CuL3)2+ subunits. Compound 3 shows a 2D network constructed from 1D inorganic Cu2âCrMo6 chains and bidentate L ligands, which is obtained at pH = 4.1. When the pH was adjusted to 4.8, compound 4 is obtained which exhibits a 4-connected 66} 3D framework. The CrMo6 anions are connected by adjacent [CuI2CuII2(μ3-OH)2(H2O)6]4+ subunits to form 1D Cu4âCrMo6 inorganic chains, which are further extended by L ligands to construct a 3D network. The effect of different types of polyanions and pH values on the assembly and various structures of the title compounds has been discussed. Furthermore, the electrochemical properties of 1 and 2, and the photocatalytic properties of 2 and 3 under different conditions have been investigated.
通过调控不同种类的多
金属氧酸盐(POM),得到四种不同维数的POM基无机-有机杂化化合物,即[(H2L)2(Mo8O26)](1)、[CuII2L6(P2W24O79)·4 ]·7 (2)、CuII2
L2(μ2-OH)[CrMo6(OH)6O18]·4 }·4 (3) 和 CuI2CuII2
L2(μ3-OH)2[CrMo6(OH)5O19]·6 } ·4 (4) [L = 1,4-双(3-
吡啶甲酰胺基)苯],在
水热条件下合成,并通过红外光谱、热重分析、粉末 XRD 和单晶 X 射线衍射进行表征。单晶X射线分析表明,化合物1表现出二维(2D)超分子网络,该网络由质子化的L
配体和[Mo8O26]4-阴离子通过氢键相互作用构建而成。化合物 2 是基于不常见的无机 [P2W24O79]4- 链和 -Y- 形 (CuL3)2+ 亚基的一维杂化链。化合物 3 显示了由 1D 无机 Cu2-CrMo6 链和双齿 L
配体构建的 2D 网络,该网络是在 pH = 4.1 下获得的。当pH调节至4.8时,得到化合物4,其表现出4-连接的66}3D框架。 CrMo6 阴离子通过相邻的 [CuI2CuII2(μ3-OH)2(
H2O)6]4+ 亚基连接形成 1D Cu4–CrMo6 无机链,并通过 L
配体进一步延伸以构建 3D 网络。讨论了不同类型的聚阴离子和 pH 值对标题化合物的组装和各种结构的影响。此外,还研究了1和2的电
化学性能以及2和3在不同条件下的光催化性能。