Cu(II)-脱乙酰壳聚糖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 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.