混合价态金属有机骨架材料（MOFs）的可控构筑在配位化学中具有重要研究意义。本文以嘧啶-5-羧酸（HL）为有机配体,在溶剂热条件下分别引入卤素离子Cl⁻和Br⁻,合成了两例具有相同zyg拓扑类型的混合价态铜基MOFs（1和2）。单晶X射线衍射分析表明,1和2中Cu(I)与卤素阴离子（Cl⁻/Br⁻）形成配位单元,而Cu(II)以单核形式存在,并通过配体连接形成三维骨架结构。粉末X射线衍射结果进一步证实了它们具有高的结晶度和相纯度。结合X射线光电子能谱、红外光谱及热重分析等表征手段,对材料的价态分布及组成进行了验证。这些MOFs都表现出全光谱吸收和良好的光电流响应,表明其在光电催化和光传感方面具有应用潜力。此外,Br⁻配位比Cl⁻配位的MOFs具有更窄的带隙和更好的光电流响应。
陈双双
,
俞先引
,
冯俊闯
,
杨军
,
卢治拥
,
白俊峰
. zyg拓扑的混合价态铜基MOFs的合成、结构及性质★[J]. 化学学报, 0
: 26060206
.
DOI: 10.6023/A26060206
The controllable assembly of mixed-valence metal-organic frameworks (MOFs) remains a formidable challenge in coordination chemistry, primarily owing to the intricate balance required to stabilize disparate oxidation states within a single crystalline structure. In this study, we successfully synthesized two isoreticular copper-based mixed-valence MOFs under solvothermal conditions, employing pyrimidine-5-carboxylic acid (HL) as the bridging ligand and introducing chloride or bromide anions as coordinating modulators. The resulting MOFs, formulated as {(CuⅠCl)2[CuⅠⅠ3(L)6(DMA)3](H2O)2}n (1) and {(CuⅠBr)2[CuⅠⅠ3(L)6(DMA)3](H2O)2}n (2), were characterized by single-crystal X-ray diffraction, which revealed that both crystallize in the trigonal space group P3c1 and share an identical zyg-type three-dimensional network. These structures arise from the cooperative self-assembly of Cu(I)-halide secondary building units and mononuclear Cu(II) centers, which are interconnected via deprotonated pyrimidine-5-carboxylate linkers. Powder X-ray Diffraction (PXRD) confirmed the high crystallinity and phase purity of the as-synthesized samples. Complementary characterization by X-ray Photoelectron Spectroscopy (XPS), Fourier-transform Infrared Spectroscopy (FT-IR), Thermogravimetric Analysis (TGA), Elemental Analysis, verified the expected stoichiometry, the coexistence of Cu(I) and Cu(II), and thermal stability. Solvent immersion tests demonstrated that both frameworks retain their structural integrity upon exposure to common organic solvents, underscoring their good chemical stability. Ultraviolet-visible diffuse reflectance spectroscopy (UV-Vis DRS) revealed broad-spectrum responses with relatively narrow band gaps for both MOFs. Photoelectrochemical measurements, including transient photocurrent responses measurements and Electrochemical Impedance Spectroscopy (EIS), indicated efficient photoinduced charge separation and interfacial charge migration. Notably, the bromide-coordinated analogue (2) exhibited a narrower band gap (1.22 eV vs 1.34 eV for 1), enhanced photocurrent density (1.06 μA cm-2 vs 0.42 μA cm-2 for 1), and reduced charge-transfer resistance relative to its chloride counterpart, clearly demonstrating that halide substitution effectively modulates the electronic band structure and promotes intramolecular electron transfer. Collectively, these mixed-valence Cu-MOFs exhibit full-spectrum absorption, robust photoelectrochemical activity, and good chemical stability, rendering them highly promising candidates for applications in photoelectrocatalysis and optical sensing.
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