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《Journal of Functional Polymers》 1991-04
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NMR Studies on Poly(tri-alkyttin mexbaciyiate)s——Ⅱ Cooidination Form of Tin Atom and ito Influence on Motions of OiHerent Groups

Xu Danqian Wang Yuanshen(East China Normal Univ., Shanghai) Xu Zhongde Han Zhewen(East China Univ. of Chem. Tech., Shanghai)  
The coordination forms of tin atoms on poly (tri-alkyltin methacsylate) s are analysed with NMR method. Analysis results reveal that the coordination forms of tin atoms appear different in various states. As samples are dissolved in COCl_3, only one type of coordination form exists that is reffered to four-coordinated form, while in solid state, there're two different types of coordination forms reffered to four- five-coordinated forms reapectinvely, neverthless, with the increases of the size of the carboxylates, tin atoms tend to exist mainly in the shape of four-coordinated structure. Results from NMR are in good conformity with those from IR.Wity NMR method, we also make a preliminary exploration on the motions of different groups in samples. It indicates that the motions of the main chain α-CH_3 are not influenced by the tin substitute, the coordination forms of tin atoms size of the tin ester groups, but the intraunit cis-coordination between tin atom carboxyl weaken the internal rotation of ester alkyl groups. In this investigetion, NMR data also reveals the segmental motions along ester alkyl side-chain in samples.
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1 He Manjun, Hart Zhewen (East China Univ. of Chemical Technology, Shanghai) Pu Lujia, Li Shulong (University of Sci. and Tech. of China, Hefei);The Effect of Coordination Crosslinks on the Solubilities of Linear Organotin Polymers[J];Journal of Functional Polymers;1988-01
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