摘要
采用二维相关红外光谱方法研究了4-氨基吡啶和甲基丙烯酸分子间相互作用。一维红外光谱难以直接反映4-氨基吡啶和甲基丙烯酸分子间相互作用的类型和键的关联,而二维相关分析结果清晰表明4-氨基吡啶和甲基丙烯酸分子间存在的相互作用。研究中发现1298和1202cm-1归属于甲基丙烯酸的—OH伸缩振动峰与1531cm-14-氨基吡啶的C═N伸缩振动峰存在同步交叉正峰,3382和3212cm-1归属于4-氨基吡啶的氨基N—H伸缩振动峰与1705cm-1归属于甲基丙烯酸的羰基伸缩振动峰存在同步交叉正峰。根据二维相关规则,4-氨基吡啶的C═N峰与甲基丙烯酸的-OH峰、4-氨基吡啶的氨基N—H峰与甲基丙烯酸的羰基峰有很强协同作用。结果表明4-氨基吡啶的C═N与甲基丙烯酸的—OH存在静电作用,4-氨基吡啶的氨基与甲基丙烯酸的羰基存在氢键作用。二维红外光谱是研究分子内、分子间相互作用的一种强有力的手段。
A two-dimensional infrared （2D IR） correlation spectroscopy technique has been introduced to study the intermolecular interaction between 4-aminopyridine and methacrylic acid. The type and relationship of the bond between 4-aminopyridine and methacrylic acid molecule could not be characterized directly using the one-dimensional FTIR spectroscopy. On the contrary, the interactions between 4-aminopyridine and methacrylic acid molecule were determined using 2D IR correlation spectroscopy. The synchronous cross peaks exist between stretching vibrations of hydroxyl group of methacrylic acid at 1 298 and 1 202 cm^-1 and C═N group of 4-aminopyridine at 1 531 cm^-1, and between carbonyl group of methacrylic acid at 1 705 cm^-1 and N—H group of 4-aminopyridine at 3 382 and 3 212 cm^-1, respectively. According to the two-dimensional correlation rules, the interactions of static electricity and hydrogen bonding exist between 4-aminopyridine and methacrylic acid molecule. Such successful applications demonstrate that two-dimensional infrared correlation spectroscopy may be a convenient and effective means in the study of the intermolecular and intramolecular interaction.
出处
《光谱学与光谱分析》
SCIE
EI
CAS
CSCD
北大核心
2008年第9期2073-2076,共4页
Spectroscopy and Spectral Analysis
基金
中国工程物理研究院基金项目(20050541)资助
