In this case, one may assume that the complex stability is maintained by hydrogen bonds.
The spectrum for chitosan–CMCcomplex in the presence of maleic acid as a resist salt show an addi-tional band characteristic of acid carboxylic group at 1617 cm−1in addition to the NH3+and COOH groups bands at 1539 and1695 cm−1.
The presence of the band at 1598 cm−1is expected,