摘要
配位聚合物ＰＡＡｍ－ＣｕＣｌ＿２和ｃｕＣｌ＿２·２Ｈ＿２Ｏ的Ｃｕ￣（２＋）２ｐＸＰＳ谱上都有Ｓｈａｋｅ－ｕｐ峰，其与各自的Ｃｕ￣（２＋）２ｐ３／２肩峰或主峰距离ΔＥｓ２或ΔＥｓ分别为８．７和８．６ｅＶ；但配位聚合物Ｃｕ（Ⅱ）－ＰＶＡ却无此峰．由此推定，前者的Ｃｕ￣（２＋）是以ｓｐ￣３杂化轨道接受ＰＡＡｍ４个链节单元Ｃ－Ｎ上Ｎ的孤对电子部分转移形成配位键；而Ｃｕ（Ⅱ）－ＰＶＡ配位聚合物中的Ｃｕ￣（２＋）却以ｄｓｐ￣２杂化轨道接受ＰＶＡ４个链节单元侧基Ｏ的孤对电子部分转移，产生配位键，即Ｃｕ￣（２＋）与ＰＡＡｍ或ＰＶＡ的链节单元配位比均是１：４，此结果与电导率法测定ＰＡＡｍ－ＣｕＣｌ＿２的配位比相同．
The shake-up peaks are observed on XPS spectra of the coordination complexPAAm-CuCl2 and CuCl2·2H2O and they have a distance to Cu2+2p3/2 shoulder or main peak(ΔEs2=8.7eV or ΔEs=8.6eV)respectively.No shake-up peak in XPS spectrum was foundfor Cu(Ⅱ)-PVA complex.It is concluded that the coordination bond in PAAm-CuCl2 isformed in result of the acceptance of sp3 hybrid orbitals with the nonpair electrons partiallytransfered from N of four C-N units of PAAm,whereas in Cu(Ⅱ)-PVA it is formed in re-sult of the acceptance of dsp2 hybrid orbitals with partial transfered nonpair electrons on theside O in four chain units of PVA.The ratio of coordination betvveen Cu2+ and PAAm orPVA is thus one to four,as was determined for Cu2+ and PAAm by electric conductivitymeasurement.
出处
《应用化学》
CAS
CSCD
北大核心
1994年第5期31-35,共5页
Chinese Journal of Applied Chemistry
关键词
铜
聚丙烯酰胺
聚乙烯醇
配位数
Cu(Ⅱ)-polymer complex, polyacrylamide, polyvinyl alcohol, coodination num-ber,XPS
