Spectra Characteristics of an Aminated Glucose and Its Complex with Cu(II)

Characteristics of an aminated glucose and its complex with Cu(Ⅱ) were investigated by FTIR,1H-NMR and UV spectroscopy,respectively.Compared with glucose,the FTIR spectrum of an aminated glucose showed a moderate peak at 1 629-1 608 cm-1 which was attributed to δNH vibration,suggesting that glucose reacted with ethylenediamine.The 1H-NMR spectrum of an aminated glucose demonstrated the signal of the C1 hydroxy proton and one of the amino proton at 4.82-4.79 ppm,illustrating that the amino of ethylenediamine was substituted for the hydroxy group of C1.As for UV spectra,an aminated glucose did not show absorbance in the ultraviolet region while its complex with Cu(Ⅱ) had obvious absorption peak at about 236 nm.The complex ratio of the aminated glucose to Cu(Ⅱ) was about 1 to 1 and the stability constant of its Cu(Ⅱ) complex was 6.8×107 L·mol-1.