IR, ESR and XPS results show that the chitosan film (CS) soaked with aqueous cupric amine solution forms Cu(II)-CS coordination polymer, which adsorbs partial Cu(II) too. The coordination number for the Cu (II)-CS polymer was studied by the shake-up effect observed in XPS spectra. The coordination bond in Cu(II)-CS is formed as a result of the partial transfer of lone pair electrons from two N's and two O's of CS to dsp^2 hybrid orbitals of Cu(II) in low spin state. So its coordination number is four. By the same method, coordination number of Cu(II)-PVA polymer is also studied. It is found that as a result of the partial transfer of the lone pair electrons on the side O in four chain unit of PVA to dsp^2 hybrid orbitals of Cu(II), the coordination number for PVA is four, too. This verifies indirectly that the method for studying coordination number of Cu(II)-CS coordination polymer is reliable.

Key words: COPPER COMPLEX, CHITOSAN, CHITOSAN, COORDINATION NUMBER, INFRARED SPECTROPHOTOMETRY, ELECTRON SPIN RESONANCE, X-RAY PHOTOELECTRON SPECTROMETRY, POLYVINYL ALCOHOL, COPPER CHLORIDE