1. A planar tetradentate dinuclear ligand, 3, 5-bis(2-pyridyl) pyrazole, was synthesized by a three-step reaction of esterification, condensation and addition.
   以2-吡啶甲酸为原料，经酯化、缩合、加成合成了平面四齿双核配体3，5-二（2-吡啶基）吡唑。
2. Among of them, indoles and pyrazoles are of great importance and they are also hotspots that organic chemists are researching.
   吲哚和吡唑是含氮有机杂环化合物的两大类型，它们也是有机化学家研究的热点问题。

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