欢迎访问《人工晶体学报》官方网站,今天是 分享到:

人工晶体学报 ›› 2025, Vol. 54 ›› Issue (9): 1642-1653.DOI: 10.16553/j.cnki.issn1000-985x.2025.0063

• 研究论文 • 上一篇    下一篇

一例二维钴金属有机框架材料的合成、晶体结构及水中荧光识别性能研究

陈文涛1(), 庄杏宜2, 安航宜1, 来中杰1, 王爱荣1, 罗亚妮1(), 史忠丰1, 李家明1()   

  1. 1.北部湾大学石油与化工学院,广西绿色化工新材料与安全技术重点实验室,钦州 535011
    2.北部湾职业技术学校经济学部,钦州 535000
  • 收稿日期:2025-03-27 出版日期:2025-09-20 发布日期:2025-09-23
  • 通信作者: 罗亚妮,李家明
  • 作者简介:陈文涛(2000—),男,广东省人,硕士研究生。E-mail:willtl@163.com
  • 基金资助:
    广西自然科学基金(2025GXNSFAA069072);广西自然科学基金(2025GXNSFHA069144);广西重点研发计划(桂科自AB25069382);广西教育厅高校科研项目(2025KY0481);北部湾大学高层次人才项目(24KYQD04);广西研究生教育创新计划项目(YCSW2025621);国家自然科学基金(22065001);广西绿色化工新材料与安全技术重点实验室(2023ZZKT01)

Synthesis, Crystal Structure, and Fluorescence Sensing Property in Water by a Two-Dimensional Cobalt Metal-Organic Framework

CHEN Wentao1(), ZHUANG Xingyi2, AN Hangyi1, LAI Zhongjie1, WANG Airong1, LUO Yani1(), SHI Zhongfeng1, LI Jiaming1()   

  1. 1.Guangxi Key Laboratory of Green Chemical Materials and Safety Technology,College of Petroleum and Chemical Engineering,Beibu Gulf University,Qinzhou 535011,China
    2.Department of Economics,Beibu Gulf Vocational and Technical School,Qinzhou 535000,China
  • Received:2025-03-27 Online:2025-09-20 Published:2025-09-23
  • Contact: LUO Yani, LI Jiaming

摘要: 本文以间苯二甲酸(H2IPA)和1,3,5-三(1-咪唑基)苯(TIB)为混合配体,硝酸钴为金属源,通过溶剂热法合成了一例新型二维钴金属有机框架化合物{[Co(IPA)(TIB)]·2H2O} n (Co-MOF)。通过单晶X射线衍射、粉末X射线衍射、红外光谱、热重分析及荧光光谱等手段对其结构和性能进行了系统表征。单晶衍射结果表明,该Co-MOF属于单斜晶系,空间群为P21/c,晶胞参数为a=0.964 28(7) nm,b=1.282 98(10) nm,c=1.783 32(14) nm。其不对称单元结构包含1个Co(Ⅱ)离子、1个脱质子的IPA2-配体、1个TIB中性配体和2个结晶水分子。IPA2-配体和TIB配体都通过μ2-η1η1桥联方式键合2个Co2+,形成一四配位的扭曲四面体CoN2O2构型。这些CoN2O2次小结构单元,进一步由倒反对称相关联的IPA2-和TIB配体连接,形成二维梯状钴基金属有机框架结构。拓扑结构分析表明该二维Co-MOF可简化为Schläfli符号为(44.62)的(4,4)-连接的sql网格结构。此外,Co-MOF层与层之间存在由TIB配体中对称相关联咪唑环间所形成的强π-π堆积作用,将二维Co-MOF层拓展为三维超分子结构。荧光实验研究表明,该Co-MOF对水中的3种多氧酸根阴离子Cr2O72-、CrO42-、S2O82-和Fe3+展现出高选择性和高灵敏的荧光猝灭响应,其检测限分别为2.007×10-4、2.514×10-4、8.331×10-4和2.709×10-4 mol/L。得益于开放的金属位点和其中未参与配位的咪唑基团,该Co-MOF兼具优异的热稳定性与荧光传感性能,在环境污染物检测领域具有广泛的潜在应用价值。

关键词: 钴(Ⅱ)金属有机框架; 晶体结构; 荧光传感; 猝灭常数; 多氧酸根离子; 铁(Ⅲ)离子

Abstract: A new two-dimensional cobalt-based metal-organic framework (Co-MOF) with the formula {[Co(IPA)(TIB)]·2H2O} n, was successfully synthesized through solvothermal method using isophthalic acid (H2IPA) and 1,3,5-tris(1-imidazolyl)benzene (TIB) as mixed ligands, and cobalt nitrate as metal source. Its crystal structure and properties were fully characterized by single-crystal X-ray diffraction (SCXRD), powder X-ray diffraction (PXRD), infrared spectroscopy (IR), thermogravimetric analysis (TGA), and fluorescence spectroscopy. The SCXRD determination reveals that the Co-MOF crystallizes in the monoclinic system with space group P21/c, and with the unit cell parameters of a=0.964 28(7) nm, b=1.282 98(10) nm, and c=1.783 32(14) nm. The asymmetric unit of Co-MOF contains a Co(Ⅱ) ion, a deprotonated IPA2- anion ligand, a neutral TIB ligand, and two crystalline H2O molecules. Notably, both IPA2- and TIB ligands were observed to coordinate two Co2+ by a μ2-η1η1 bridging mode, forming a distorted tetrahedral CoN2O2 secondary building unit. These structural units were further interconnected via inversion-related IPA2- and TIB ligands, resulting in a two-dimensional ladder-type framework. Topologically, the 2D network of Co-MOF can be simplified as a (4,4)-connected sql network with a Schläfli symbol of (44.62). Furthermore, the adjacent 2D layers were extended to a three-dimensional supramolecular architecture with strong π-π stacking interactions between the symmetry-related imidazole rings of TIB ligand. The fluorescence investigations indicate that this Co-MOF exhibits high selectivity and sensitivity for detecting three polyoxoanions (Cr2O72-, CrO42-, and S2O82-) and Fe3+ in aqueous solutions, with the calculated detection limits of 2.007×10-4, 2.514×10-4, 8.331×10-4, and 2.709×10-4 mol/L, respectively. The Co-MOF has excellent thermal stability and fluorescence sensing performance, which may be accounted for the presence of open metal sites and uncoordinated imidazole groups of TIB ligand. These combined characteristics suggest that the Co-MOF possesses significant potential for environmental pollutant detection applications.

Key words: cobalt(II) metal-organic framework; crystal structure; fluorescence sensing; quenching constant; polyoxoanion recognition; iron (Ⅲ) ion

中图分类号: