偶氮基双核钴配合物的合成、结构及光学性质  

Synthesis,Structure and Optical Properties of a Azo-based Dinuclear Cobalt Complex

作　　者：潘昊 陈琪骐 谢燕婷 梁晓彤 卢子豪 邱燕璇 PAN Hao;CHEN Qi-qi;XIE Yan-ting;LIANG Xiao-tong;LU Zi-hao;QIU Yan-xuan(School of Chemistry and Materials Science,Guangdong University of Education,Guangzhou 510303,China)

机构地区：[1]广东第二师范学院化学与材料科学学院,广东广州510303

出　　处：《化学试剂》2022年第4期544-549,共6页Chemical Reagents

基　　金：广东省攀登计划项目(pdjh2020a0425);广东省普通高校青年创新人才项目(2019KQNCX100)。

摘　　要：室温下,通过调控反应体系的pH值,构筑了一例新的基于5-偶氮四唑水杨酸(H_(3)ASA)的钴配合物[Co_(2)(HASA)_(2)(H_(2)O)_(6)],并借助X-射线单晶衍射解析其晶体结构。结果显示,该配合物为单斜晶系,P2_(1)/c空间群,每个不对称单元由两个Co(Ⅱ)离子、两个HASA^(2-)配体以及6个配位水分子组成。晶体结构中,中心离子Co(Ⅱ)为六配位八面体构型,配体HASA^(2-)桥联两个不同的Co(Ⅱ)离子形成双核结构,邻近的双核单元通过O—H…O、O—H…N和C—H…O 3种氢键相互作用形成3D超分子结构。配合物在室温下稳定,研究表明该配合物在365 nm波长光辐照下展现出光致异构性质,在302 nm光激发下发出紫色荧光。A new Co(Ⅱ) complex based on the 5-azotetrazolyl salicylic acid(H_(3)ASA) ligand of [Co_(2)(HASA)_(2)(H_(2)O)_(6)] was constructed via regulating the pH value of reaction system at room temperature and its crystal structure was characterized by single crystal X-ray diffraction.The result indicates that this complex forms dimer and crystallizes in the monoclinic space group P2_(1)/c with each asymmetric unit consisting of two Co(Ⅱ) ions,two HASA^(2-) ligands and six coordinated water molecules.In the crystal structure,the central ion Co(Ⅱ) coordinates to six atoms,affording an octahedral geometry.Each HASA^(2-) ligand acts as bridging ligand coordinating to two different Co(Ⅱ) ions,resulting in a dinuclear structure.Three types of hydrogen-bonds of O—H…O,O—H…N and C—H…O connect the neighboring dinuclear structures into a 3 D supramolecular framework.This complex was stable at room temperature.The researches demonstrated that this complex displayed photoisomerization property under 365 nm light radiation and purple fluorescence upon 302 nm light excitation.

关 键 词：偶氮化合物 晶体结构 钴 光致异构 荧光 

分 类 号：O614[理学—无机化学]