RETRACTED: 2D NMR assisted structure elucidation of three cyanoethylated cellulose derivatives and correlated with their properties
| Autor: | Huiqing Wang, Xiaofei Shen, Hao Qian, Mingtao Zhang, Kaiyun Xie, Yan Zhang, Lei Song |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
chemistry.chemical_classification
Magnetic Resonance Spectroscopy Acrylonitrile 010405 organic chemistry Organic Chemistry Ether General Medicine Polymer 010402 general chemistry Branching (polymer chemistry) 01 natural sciences Biochemistry 0104 chemical sciences Analytical Chemistry chemistry.chemical_compound chemistry Proton NMR Organic chemistry Cellulose Two-dimensional nuclear magnetic resonance spectroscopy Heteronuclear single quantum coherence spectroscopy Hydroxyethyl cellulose |
| Zdroj: | Carbohydrate Research. 487:107861 |
| ISSN: | 0008-6215 |
| DOI: | 10.1016/j.carres.2019.107861 |
| Popis: | Three cellulose derivatives CEC, CEHEC, and CEGEC prepared by cyanoethylation of cellulose, hydroxyethyl cellulose (HEC), and glycerol ether cellulose (GEC), respectively, with similar degrees of substitution, exhibited different properties involving their dielectric application. But their structures were hard to distinguish by FTIR, 1H NMR, or 13C NMR spectroscopy. Here, 2D NMR techniques (COSY, HSQC) assisted by partial hydrolysis and full acetylation were applied and demonstrated to be useful for structural elucidation, differentiated their peaks on 2D NMR map. Furthermore, GPC-MALLS revealed that CEHEC has highest branching ratio, while CEC was strictly linear with similar molecular weights. Branching CEHEC exhibited a lowest Tg, while CEGEC showed better dielectric properties due to the relative mobility of the cyano groups at the end of the glycerol moieties. So this work open the way of exploring structure of carbohydrate polymer derivatives assisting by 2D NMR techniques COSY and HSQC. |
| Databáze: | OpenAIRE |
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