摘要
以3-羧基苯磺酸根(3-SBA)和2-(4-吡啶基)-咪唑[4,5-f]菲咯啉(4-PDIP)为配体,用水热法合成了3种稀土配合物:[Ln2(3-SBA)2(4-PDIP)2(OH)2(H2O)4]·2H2O(Ln=Sm(1),Eu(2)和Gd(3))。用X-射线单晶衍射分析方法测定了其晶体结构。配合物1~3为同构的双核分子。2个羟基以桥联方式连接2个Ln(Ⅲ)离子,3-SBA和4-PDIP以螯合双齿形式与Ln(Ⅲ)离子配位。双核分子之间通过氢键构筑成三维超分子结构。配合物1和3分别在545 nm和529 nm处出现来自于配体的荧光发射,对应于配体的π*-π的跃迁。配合物2呈现Eu(Ⅲ)离子的特征发射,位于579、592、612、650和696 nm处的发射峰分别对应于5D0→7Fj(j=0~4)跃迁。
Taking 3-sulfobenzoate(3-SBA) and 2-(4-pyridyl)imidazole[4,5-f ]phenanthroline(4-PDIP) as the ligands,three lanthanide complexes, [Ln2(3-SBA)2(4-PDIP)2(OH)2(H2O)4]·2H2O(Ln=Sm(1), Eu(2), Gd(3)) were obtained by hydrothermal method. The crystal structures were determined by single crystal X-ray diffraction. The three complexes are binuclear molecules. In the complexes, two Ln (Ⅲ) ions are linked by two hydroxyl groups in bridging-bidentate coordination mode. 3-SBA and 4-PDIP ligands are coordinated with Ln(Ⅲ) ions by the chelating bidentate coordination mode. The three-dimensional supramolecular structure is formed through the hydrogen bonds between binuclear molecules. Complexes 1 and 3 display intense broad emission bands at 545 nm and 529 nm, respectively, which correspond to the π*-π transition of the ligands. Complex 2 presents the characteristics emission of Eu (Ⅲ) ion. The narrow emission bands at 579, 592, 612, 650 and 696 nm are attributed to5D0→7Fj(j=0-4) transitions of the Eu(Ⅲ) ion, respectively. CCDC: 1046171, 1; 1046169, 2; 1046170, 3.
出处
《无机化学学报》
SCIE
CAS
CSCD
北大核心
2015年第4期717-724,共8页
Chinese Journal of Inorganic Chemistry
基金
国家自然科学基金(No.21471104)资助项目
关键词
稀土配合物
3-羧基苯磺酸
晶体结构
荧光
lanthanide complex
3-sulfobenzoate
crystal structure
fluorescence