吡罗昔康镧配合物的合成与表征(2)
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4、UV-Vis spectroscopy
UV-Vis spectra of the ligand and complexe have been recorded in dmf solution.The UV spectra of piroxicam complexes in dmf solution are alike (strong absorption occur at about 267 and 357nm), but they differ from that of the parent compound.The band at 371 nm of the piroxicam is attributed to conjugated system of enolate, carboxyl and amide N atoms. It is shifted to 357nm . This may be attributed to the donation of the lone pair of the amide N atom to the La ion center,which destructs the p-π conjugate,and destructs the big conjugated system,which leads the band from 371 nm to 357 nm.
5、DTA-TG analysis
The DTA curve show one endothermic peak at 72℃, which is the dehydration,and four indothermic peaks at 376℃, 485℃, 590℃, 782℃, which are the decomposition of the complexe and the ligand ......
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