Supramolecular template-directed synthesis of perfect phenelenediimino-bridged ladderlike polyphenylsiloxanes
文献类型：期刊论文
| 作者 | Zhang, TY; Deng, KL; Zhang, PP; Xie, P; Zhang, RB |
| 刊名 | Chemistry-a european journal
 |
| 出版日期 | 2006-04-14 |
| 卷号 | 12期号:13页码:3630-3635 |
| 关键词 | Hydrolysis Ladder superstructure Self-assembly Silicon Supramolecular chemistry |
| ISSN号 | 0947-6539 |
| DOI | 10.1002/chem.200501447 |
| 通讯作者 | Zhang, rb(zhagrb@iccas.ac.cn) |
| 英文摘要 | A template synthesis of the soluble, high molecular weight (m,,), and perfect p-phenylenedimino (p-pda)-bridged ladderlike polyphenylsiloxane (plps) is reported. first, n,n'-bis(phenyldichlorosilyl)-p-pda monomers were self-assembled into a perfect ladder superstructure (ls) by concerted interaction of aromatic pi-pi stacking and hydrogen bonding. then the ls underwent a novel stoichiometric hydrolysis/dehydrochlorination-condensation reaction instead of the usual hydrolysis/dehydration-condensation reaction, leading to the plps. the perfect ladder structures of both the plps and, in particular, the unstable supramolecular ls were confirmed as follows. 1) there are two bragg peaks in solid and/or solution x-ray diffraction (xrd) spectra representing the ladder width (w) and ladder thickness (t); these peaks were consistent with those calculated by molecular simulation. 2) both the plps and ls have extremely sharp absorption peaks with small half-peak widths (delta(1/2) < 0.3 ppm) in si-29 nmr spectra, suggesting the presence of the perfect ladder structure for plps and ls. 3) moreover, no noticeable absorption peaks for the si-oh and nh2 groups were observed in ftir and si-29 nmr spectra, indicating that the si-n bond of the equivalent to si-nh-c6h4-nh-si equivalent to ladder rung of plps and ls is not cleaved. 4) both plps and ls show similar emission peaks (in fluorescence spectroscopy) attributed to the excimer formed by face-to face pi-pi stacking of phenyl groups along the ladder chain rather than a branched direction. 5) differential scanning calorimetry (dsc) measurements indicate a high glass temperature (t-g=176.4 degrees c) for plps. as circumstantial evidence, this result further indicates very high stiffness of plpss ladder backbone as compared with flexible single-chain polyphenylmethyl-siloxane with a low t-g = -69.4 degrees c. |
| WOS关键词 | STEPWISE COUPLING POLYMERIZATION ; INTRAMOLECULAR EXCIMER FORMATION ; POLYMETHYLSILOXANE ; FLUORESCENCE ; POLYMERS ; POLY(PHENYLSILSESQUIOXANE) ; PHENYLSILSESQUIOXANE ; SILSESQUIOXANES |
| WOS研究方向 | Chemistry |
| WOS类目 | Chemistry, Multidisciplinary |
| 语种 | 英语 |
| WOS记录号 | WOS:000237177800021 |
| 出版者 | WILEY-V C H VERLAG GMBH |
| URI标识 | http://www.irgrid.ac.cn/handle/1471x/2378845 |
| 专题 | 中国科学院大学 |
| 通讯作者 | Zhang, RB |
| 作者单位 | 1.Chinese Acad Sci, Inst Chem, State Key Lab Polymer Phys & Chem, Joint Lab Polymer Sci & Mat, Beijing 100080, Peoples R China 2.Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China 3.Beijing Univ Chem Technol, Beijing 100029, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zhang, TY,Deng, KL,Zhang, PP,et al. Supramolecular template-directed synthesis of perfect phenelenediimino-bridged ladderlike polyphenylsiloxanes[J]. Chemistry-a european journal,2006,12(13):3630-3635. |
| APA | Zhang, TY,Deng, KL,Zhang, PP,Xie, P,&Zhang, RB.(2006).Supramolecular template-directed synthesis of perfect phenelenediimino-bridged ladderlike polyphenylsiloxanes.Chemistry-a european journal,12(13),3630-3635. |
| MLA | Zhang, TY,et al."Supramolecular template-directed synthesis of perfect phenelenediimino-bridged ladderlike polyphenylsiloxanes".Chemistry-a european journal 12.13(2006):3630-3635. |
入库方式： iSwitch采集
来源：中国科学院大学
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。