摘要
三个不同的多吡啶配体:2,3-二(2-吡啶基)喹喔啉(dpq)、2,3,7,8-四(2-吡啶基)喹喔啉(tppq)和2,3,6,7,10,11-六(2-吡啶基)喹喔啉(hpdq)分别和银反应得到3个银的配合物:[Ag(dpq)(NO_3)_2]_n(1)、[Ag_4(tppq)_2(NO_3)_4](2)和[Ag_6(hpdq)_2(NO_3)_6](3)。结果显示,3个配体分别和银形成了四核(1)、四核(2)以及六核(3)的三明治单晶结构,1和2的四核结构依靠Ag和NO_3^-之间的相互作用进一步延伸为二维面,而3的六核结构依靠C-H…O的氢键作用形成三维网。此外,在研究3个配体和金属银在溶液中的光谱学性质时发现,配体hpdq和银反应的紫外吸收光谱和荧光发射光谱都要比其它2个配体灵敏度高。
Three Ag(Ⅰ) coordination complexes, namely [Ag(dpq)(NO3)2]n(1), [Ag4(tppq)2(NO3)4](2) and [Ag6(hpdq)2(NO3)6](3) have been synthesized based on three polypyridyl ligands: 2,3-di(pyridin-2-yl)quinoxaline(dpq), 2,3,7,8-tetra(pyridine-2-yl)pyrazino[2,3-g]-quinoxaline(tppq) and 2,3,6,7,10,11-hexakis(2-pyridyl) dipyrazino[2,3-f:2′,3′-h]quinoxaline)(hpdq), respectively. Single crystal X-ray diffraction analyses reveal that complexes 1~3 assembled based on distinct double-decker unit comprising two respective polypyridyl ligands but four, four, and six Ag (Ⅰ)ions, respectively. Among them, The double-decker units in 1 and 2 both extended to two dimensional net via the coordination interaction between Ag (Ⅰ) and NO3^-anion, while that in 3 to three dimensional net via C-H … O hydrogen bond. Furthermore, the coordintion interaciton of polypyridyl ligands and Ag (Ⅰ) ion in solution was also investigated by UV-Vis absorption and fluorescence spectroscopic analyses, which witnesses the much more sensitive spectral response of hpdq to the additon of Ag(Ⅰ) ion than other two ligands. CCDC: 868734, 1; 868735,2; 790268, 3.
出处
《无机化学学报》
SCIE
CAS
CSCD
北大核心
2016年第3期537-544,共8页
Chinese Journal of Inorganic Chemistry
基金
国家自然科学基金(No.21301100)
河南省教育厅基金(No.13A150819)
南阳师范学院专项基金(No.ZX2013029)资助项目
关键词
多吡啶配体
金属有机配合物
自主装
紫外光谱
荧光光谱
polypyridyl ligands
metal-organic coordination complexes
self-assembly
UV-Vis spectrum
fluorescence spectrum