Keggin型多酸基晶态材料的合成及催化性能

doi:10.11944/j.issn.1000-0518.2020.04.190268

摘要/Abstract

摘要：

通过引入Keggin型多酸离子[PW₁₂O₄₀]^3-到Co-bbp(bbp:3,5-双(4-吡啶基)吡啶)体系中,在水热条件下合成一个新的物质Co{bbp}₂(H₂O)₄(HPW₁₂O₄₀)(1)。通过X射线单晶衍射(CDD)分析表明该化合物为单斜晶系,C2空间群。所呈现的结构由金属Co和有机配体bbp配合形成金属-有机单体,然后通过配体间的π…π键堆积成二维层状框架结构,多酸[PW₁₂O₄₀]^3-作为模板嵌入框架的空穴内,形成一个以多酸为模板超分子化合物。通过研究化合物1的催化性质,结果发现其对罗丹明B(RhB)具有很好的催化降解能力(可见光照120 min后降解率为94%),并且可以电催化亚硝酸根(NO₂^-)和抗坏血酸(AA),是一个具有多功能的催化剂。

关键词: Keggin型多酸, 超分子化合物, 水热合成, 催化性质

Abstract:

By introducing polyoxotungstates [PW₁₂O₄₀]^3- into the Co-bbp(bbp:3,5-bis(pyrid-4-yl)pyridine) system, a new polyoxometalate-based inorganic-organic hybrid, [Co(Hbbp)₂][PW₁₂O₄₀] (1), was synthesized under the hydrothermal condition. The structure was determined by single-crystal X-ray diffraction analysis. Structural analyses show that metal Co coordinates with bbp to form the metal-organic monomer which stacks through π…π bond between ligands to from a two-dimensional layered framework structure. [PW₁₂O₄₀]^3- is embedded into the gaps as the template, forming a multi-acid-based supramolecular compound. The properties of compound 1 was investigated, and the results indicate that the degradation ratio of rhodamine B (RhB) reaches 94% after 120 min (under visible light). In addition, compound 1 is a multifunctional catalyst and has good electrocatalytic activities towards the reduction of NO₂^- and oxidation of ascorbic acid.

Key words: Keggin polyoxometalate, supramolecular compound, hydrothermal syntheses, catalytic property

张转芳, 郑建华, 辛建娇, 赵楠, 陈洁, 许芮. Keggin型多酸基晶态材料的合成及催化性能[J]. 应用化学, 2020, 37(4): 481-488.

ZHANG Zhuanfang, ZHENG Jianhua, XIN Jianjiao, ZHAO Nan, CHEN Jie, XU Rui. Syntheses and Catalytic Properties of Keggin-Type Polyoxometalate-Based Crystal Materials[J]. Chinese Journal of Applied Chemistry, 2020, 37(4): 481-488.

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