Cu(Ⅱ)脱乙酰壳聚精配位聚合物的配位数

IR,ESR和XPS的测试结果表明,脱乙酰壳聚糖(简记CS)膜在铜氨水溶液浸渍过程中Cu(Ⅱ)既与CS发生配位反应形成Cu(Ⅱ)-CS配位聚合物,也产生吸附作用.ESR谱示出CuCl_2·2H_2O与Cu(Ⅱ)-CS膜中的Cu(Ⅱ)均含有一个单电子,可以利用XPS的Shake-up效应研究Cu(Ⅱ)-CS配位聚合物的配位数,所得结果为4.又以同样的方法研究Cu(Ⅱ)-聚乙烯醇(简记PVA)配位聚合物的配位数,发现Cu(Ⅱ)是以低自旋状态的dsp~2杂化空轨道与PVA的羟基氧配位,其配位数也是4,这与资料所报道的一致,从而间接地验证了此方法研究Cu(Ⅱ)-CS配位聚合物配位数的可靠性.

The Coordination Number of Cu( II )-Chitosan Coordination Polymer

IR, ESR and XPS results show that the chitosan film(CS) soaked with aqueous cupric amine solution forms a 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 dsp2 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 0 in four chain unit of PVA to dsp2 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.