Covalent modification of multiwalled carbon nanotubes with imidazolium-based ionic liquids: Effect of anions on solubility
Covalent modification of multiwalled carbon nanotubes with imidazolium-based ionic liquids: Effect of anions on solubility
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DOI：
10.1021/cm0511421
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发表时间：
2006-03-21
影响因子：
8.6
通讯作者：
Lee, SG
中科院分区：
文献类型：
--
作者：
Park, MJ;Lee, JK;Lee, SG
采用咪唑盐离子液体对多壁碳纳米管进行了共价修饰。酰氯官能化的MWCNT与可商购获得的（3-氨基丙基）咪唑的偶联，随后与正丁基溴反应，得到1-丁基溴化咪唑鎓盐官能化的MWCNT（f-3a）。f-3a的溴阴离子可以通过复分解与BF 4-、PF 6-和NTf 2-（N，N-双（（三氟甲基）磺酰基）酰胺）交换，得到带有不同抗衡阴离子的官能化MWCNTs，f-3b（B3 F4-）、f-3c（PF 6-）和f-3d（NTf 2-）。拉曼、IR、NMR、TGA和XPS分析清楚地证实了IL-官能化的MWCNT的共价官能化和咪唑鎓盐形成以及阴离子交换。UV-vis数据表明，抗衡阴离子对离子液体功能化MWCNTs在水中的相对溶解度有影响：f-3在水中的溶解度顺序为f-3a（Br-）> f-3b（BF 4-）> f-3c（PF 6-）> f-3d（NTf 2-），水溶性f-3a通过与NTf 2-的简单阴离子交换从水相转移到氯仿相。所有的IL-官能化的多壁碳纳米管，包括水溶性的f-3a，表现出在离子液体中的优先溶解度，[bmim][NTf 2]。
Multiwalled carbon nanotubes (MWCNTs) were covalently modified with imidazolium salt-based ionic liquids (ILs). Coupling of acid chloride-functionalized MWCNTs with commercially available (3-aminopropyl)imidazole, followed by the reaction with n-butyl bromide, afforded 1-butylimidazolium bromide salt-functionalized MWCNTs (f-3a). The bromide anion of f-3a could be exchanged with BF4-, PF6-, and NTf2- (N,N-bis((trifluoromethyl)sulfonyl)amide) by metathesis and afforded functionalized MWCNTs,f-3b (B3F4-),f-3c (PF6-), and f-3d (NTf2-), bearing different counteranions. Raman, IR, NMR, TGA, and XPS analyses clearly confirmed covalent functionalization and imidazolium salt formation as well as anion exchange of the IL-functionalized MWCNTs. UV-vis data imply that counteranions have an effect on the relative solubility of the IL-functionalized MWCNTs in water: the solubility of f-3 in water is of the orderf-3a (Br-) > f-3b (BF4-) > f-3c (PF6-) > f-3d (NTf2-), and the water-solublef-3a was phase-transferred from the aqueous phase to the chloroform phase via simple anion exchange with NTf2-. All of the IL-functionalized MWCNTs, including the water-solublef-3a, exhibited a preferential solubility in an ionic liquid, [bmim][NTf2].