The fluorescence property of Schiffʹs bases of carboxymethyl cellulose

The Schiffʹs bases of cellulose derivatives, o-pheylene diimido carboxymethyl cellulose (PDIMCMC) and p-sulfophenyl imodo carboxymethyl cellulose (SPIMCMC), were synthesized by the reaction of dialdehyde carboxymethyl cellulose (DACMC) with o-phenylene diamine (PDM) and p-aminobenzen sulfonic (ASA), respectively. Their structures were characterized by FTIR. The fluorescence spectra (FS) appeared and the Schiffʹs bases had strong fluorescence intensities (FI). These FSs and FIs were influenced by either pH or solute concentration. For example the PDIMCMC results indicated that its FI reached maximum at pH = 6.48 and its FS shifted to a longer wavelength in acidity; its FI is the strongest in 1.2 × 10−3 g mL−1.