A theoretical and experimental exploration of the mechanism of microwave assisted 1,3-dipolar cycloaddition of pyridinium ylides to single walled carbon nanotubes
A theoretical and experimental exploration of the mechanism of microwave assisted 1,3-dipolar cycloaddition of pyridinium ylides to single walled carbon nanotubes
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微波辅助吡啶叶立德与单壁碳纳米管1,3-偶极环加成反应机理的理论与实验探索
DOI:
10.1016/j.matchemphys.2014.01.045
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发表时间:
2014
影响因子:
4.6
通讯作者:
Bayazit M
中科院分区:
文献类型:
--
作者:
Bayazit M
Cycloaddition reactions have widely been used for surface functionalization of single walled carbon nanotubes (SWNTs). Here, 1,3-dipolar cycloaddition (1,3-DC) of two new pyridinium ylides, generatedin-situvia the addition of triethylamine (NEt3) to the Kröhnke saltsN-(4-methyl sodium benzene sulfonate)-pyridinium bromide andN-(4-nitrobenzyl)-pyridinium bromide, to SWNTs under microwave conditions are assessed both theoretically using PM3 (RHF) type calculations and experimentally. Evidence of covalent surface modification is provided by FTIR, UV–vis–NIR and resonance Raman spectroscopy. Solubility of the modified SWNTs increases when compared to as-received SWNTs. Quantification of surface groups is performed via TGA-MS and XPS. 1,3-DC of pyridinium ylides with smaller HOMO–LUMO energy gap is found to be more selective to large diameter SWNTs. Theoretically predicted smaller energy gaps between HOMOylidesand LUMO(8,8)SWNT suggest that the charges are probably transferred from pyridinium ylides to SWNTs indicating HOMOylide–LUMO(8,8) SWNTcontrolled 1,3-DC. Regioselectivity of second ylide addition as addendum to ylide–SWNT adduct is also discussed.
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DOI:
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