Synthesis and Spectrum Properties Studies of Tropolone Azo

<正>1 Results Tropolone,2-hydroxy-2,4,6-cycloheptatrienone,an isomer of benzoic acid,a seven-membered,non-benzenoid aromatic molecule possessing three double bonds conjugated with a carbonyl group.The studies of tropolone forms complexes[1] with many metals became more important because of their potential application in the field of material science,agriculture and medicine.In the course of our studies on the chemistry of 5-substituted tropolone derivatives[2],the synthesis of new tropolone azo derivatives through the coupling of diazotized 2-amino-4-nitropheno-6-sulfoacidphenol and tropolone is described.it's structures were confirmed by elemental analysis,IR and 1H NMR,13C NMR and chromogenic properties and UV-Vis absorption spectra were investigated under different pH condition.Experimental results show that the synthesized derivatives can be used as new indicators and host molecules.Tropolone-azo (A)was prepared by reacting tropolone and 2-amino-4-nitropheno-6-sulfoacidphenol in a 1:1 molar ratio in water.See Fig.1.