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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 different polypyridyl ligands: 2,3-bis (2-pyridyl) quinoxaline (dpq), 2,3,7,8-tetrakis (2-pyridyl) quinoxaline (tppq) and 2 , 3,6,7,10,11-hexa (2-pyridyl) quinoxaline (hpdq) were reacted with silver to obtain three silver complexes: [Ag (dpq) , [Ag_4 (tppq) _2 (NO_3) _4] (2) and [Ag_6 (hpdq) _2 (NO_3) _6] (3). The results show that the three ligands form tetragonal single crystal structure of tetranuclear (1), tetranuclear (2) and hexanuclear (3) with silver, respectively. The tetranuclear structure of 1 and 2 depend on the interaction between Ag and NO_3 ~ Of the interaction further extended to two-dimensional surface, and 3 of the six-core structure relies on CH ... O hydrogen bond formation of the three-dimensional network. In addition, the spectroscopic properties of the three ligands and metallic silver in solution were investigated. It was found that both the UV absorption spectra and the fluorescence emission spectra of the ligands hpdq and silver were higher than those of the other two ligands.