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人工晶体学报 ›› 2026, Vol. 55 ›› Issue (2): 314-324.DOI: 10.16553/j.cnki.issn1000-985x.2025.0198

• 研究论文 • 上一篇    下一篇

[LaL3(H2O)2] n 配合物的合成、晶体结构及与CT-DNA/HSA结合研究

黄秋萍(), 杨思明, 郑燕菲, 庞华钰, 黄秋婵(), 张海全()   

  1. 广西民族师范学院,崇左市锰资源综合利用技术重点实验室,广西锰资源高值化利用重点实验室,崇左 532200
  • 收稿日期:2025-09-10 出版日期:2026-02-20 发布日期:2026-03-06
  • 通信作者: 黄秋婵,教授。E-mail:547249164@qq.com;张海全,副教授。E-mail:472401152@qq.com
  • 作者简介:黄秋萍(1990—),女,广西壮族自治区人,副教授。E-mail:469500801@qq.com
  • 基金资助:
    广西民族师范学院科研资助项目(2024FW006);广西民族师范学院科研资助项目(2024FW003);广西民族师范学院科研资助项目(2024YB089);广西民族师范学院2023年上半年高层次人才科研项目(2023SBNGCC003);广西民族师范学院2023年上半年高层次人才科研项目(2023SBNGCC001);广西高校中青年教师基础能力提升项目(2025KY0932);广西高校中青年教师基础能力提升项目(2025KY0933);广西高校中青年教师基础能力提升项目(2022KY0763)

Synthesis, Crystal Structure and Binding CT-DNA/HSA of [LaL3(H2O)2] n Complex

HUANG Qiuping(), YANG Siming, ZHENG Yanfei, PANG Huayu, HUANG Qiuchan(), ZHANG Haiquan()   

  1. Guangxi Key Laboratory for High-Value Utilization of Manganese Resources,Chongzuo Key Laboratory of Comprehensive Utilization Technology of Manganese Resources,Guangxi Minzu Normal University,Chongzuo 532200,China
  • Received:2025-09-10 Online:2026-02-20 Published:2026-03-06

摘要: 通过溶剂热法,以4-甲基-1,2,3-噻二唑-5-甲酸(HL)为配体,与六水合硝酸镧反应,合成噻二唑镧配合物[LaL3(H2O)2n,通过单晶X射线衍射、红外光谱和元素分析对配合物的结构进行表征。通过紫外(UV)和荧光光谱研究镧配合物与小牛胸腺DNA(CT-DNA)和人血清蛋白(HSA)的相互作用。单晶结构测试表明,该配合物属于三斜晶系,P1空间群,晶胞参数为a=0.979 88(5) nm,b=1.057 26(6) nm,c=1.103 62(5) nm,α=105.134(5)°,β=109.816(4)°,γ=94.221(4)°,Z=2,V=1.021 65(10) nm3Dc=1.974 g·cm-3F(000)=598.0,Rint=0.057 3。该配合物由La3+与6个4-甲基-1,2,3-噻二唑-5-甲酸根及两个水分子配位形成九配位畸变的三帽三角棱柱构型,通过羧基氧桥接形成一维链,一维链通过N—H、S—H氢键及噻二唑环π-π堆积成三维图。紫外和荧光光谱分析表明配合物与CT-DNA和HSA存在相互作用,该配合物与CT-DNA的猝灭常数Ksv=4.75×104 L·mol-1,猝灭速率常数Kq=4.75×1012 L·mol-1·s-1,结合速率常数Ka=2.45×105 L·mol-1,结合位点n=1.18,由此可知配合物对CT-DNA的荧光猝灭是静态猝灭。与HSA的猝灭速率常数Ksv=9.83×104 L·mol-1,猝灭速率常数Kq=9.83×1012 L·mol-1·s-1,结合速率常数Ka=67.61 L·mol-1,结合位点n=0.39,配合物对HSA的荧光猝灭是静态猝灭。Hirshfeld分析显示分子间存在较强的H…H作用。

关键词: 镧(III)配合物; 噻二唑; 晶体结构; Hirshfeld; CT-DNA; HSA

Abstract: Using the solvothermal method,with 4-methyl-1,2,3-thiadiazole-5-carboxylic acid (HL) as the ligand and reacting with lanthanum nitrate hexahydrate,the thiadiazole lanthanum complex [LaL3(H2O)2n was synthesized. The structure of the complex was characterized by single crystal X-ray diffraction,infrared spectroscopy and elemental analysis. The interaction of the lanthanum complex with calf thymus DNA (CT-DNA) and human serum albumin (HSA) was investigated by ultraviolet (UV) and fluorescence spectroscopy. Single crystal structure tests show that,the complex belongs to the triclinic crystal system,space group P1,unit cell parameters a=0.979 88(5) nm,b=1.057 26(6) nm,c=1.103 62(5) nm,α=105.134(5)°,β=109.816(4)°,γ=94.221(4)°,Z=2,V=1.021 65(10) nm3Dc=1.974 g·cm-3F(000)=598.0,Rint=0.057 3. The lanthanum complex is formed by La3+ coordinating with six 4-methyl-1,2,3-thiadiazole-5-carboxylate anions and two water molecules,resulting in a nine-coordinated distorted three-capped trigonal prism structure. It forms a one-dimensional chain through carboxylate oxygen bridges,and the one-dimensional chains are further assembled into a three-dimensional network through N—H,S—H hydrogen bonds and π…π stacking of the thiadiazole rings.UV and fluorescence spectroscopic analysis indicates that,the complex interacts with CT-DNA and HSA. The quenching constant Ksv of the complex with CT-DNA is 4.75×104 L·mol-1,the quenching rate constant Kq is 4.75×1012 L·mol-1·s-1,the binding rate constant Ka is 2.45×105 L·mol-1,and the binding site n is 1.18. Therefore,it can be concluded that the fluorescence quenching of CT-DNA by the complex is static quenching. The quenching constant Ksv of the complex with HSA is 9.83×104 L·mol-1,the quenching rate constant Kq is 9.83×1012 L·mol-1·s-1,the binding rate constant Ka is 67.61 L·mol-1,and the binding site n is 0.39. The fluorescence quenching of HSA by the complex is static quenching. Hirshfeld analysis shows that there is a strong H…H interaction between molecules.

Key words: lanthanum (III) complex; thiadiazole; crystal structure; Hirshfeld; CT-DNA; HSA

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