Preparation, Characterization and Crystal Structure and of a One-dimensional Chain Supramolecular Compound [Zn(dafo)_2(H_2O)_2](NO_3)_2 (dafo=4,5-Diazafluorene-9-one)

• 一维链状超分子化合物[Zn(dafo)_2(H_2O)_2](NO_3)_2(dafo=4,5-二氮芴-9-酮)的合成、表征和晶体结构