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Article: Two-dimensional infrared correlation spectroscopy on dodecyloxy benzoic acid phase transition

TitleTwo-dimensional infrared correlation spectroscopy on dodecyloxy benzoic acid phase transition
二維紅外相關光譜分析對十二烷氧基苯甲酸的相變過程
Authors
Keywords2D-FTIR (二維紅外相關光譜)
Dodecyloxy Benzoic Acid (對十二烷氧基苯甲酸)
FTIR Microspectroscopy (顯微紅外)
Issue Date2001
Citation
Spectroscopy And Spectral Analysis, 2001, v. 21 n. 6, p. 778-782 How to Cite?
光譜學與光譜分析, 2001, v. 21 n. 6, p. 778-782 How to Cite?
AbstractThermal spectra of liquid crystal, dodecyloxy benzoic acid were collected over a temperature range of 26-150 degrees C by FTIR microspectroscopy. By taking investigations of temperature-induced changes in dodecyloxy benzoic acid by means of 2D infrared correlation spectroscopy, it was possible to clearly describe the molecular dynamic mechanism of dodecyloxy benzoic acid aggregates in the phase transitions. The analysis shows that p-dodecyloxy benzoic acid crystallized as multi-molecule aggregates through hydrogen bonds between the carboxylic groups, while the long polymethylene residues intermixed each other in solid state. Premelting phenomena in polymethylene residues were observed with temperature up to melting point. It seems that lots of oxy-benzoic acid part recrystallized to cycle dimer as supermolecular liquid crystal during alkyl chain melting in crystal-smectic phase transition. After temperature over 132 degrees C, oxy-benzoic acid part were melted to open dimer and separate molecule in liquid state.
利用顯微紅外光譜技術在寬范圍的溫度區域跟蹤對十二烷氧基苯甲酸相變過程 ,經二維相關紅外光譜分析 ,來描述對十二烷氧基苯甲酸在不同溫度區間的分子動態變化。結果認為固態由烷基相互纏結以多種羧酸聚集體的狀態存在 ,95℃發生的相轉變主要是非均相的十二烷基熔融和氧基苯甲酸部分重結晶的過程 ,132℃以后的相轉變主要是羧酸聚集體部分氫鍵集中斷裂和羧酸苯醚基團迅速熔融的結果。
Persistent Identifierhttp://hdl.handle.net/10722/167694
ISSN
2015 Impact Factor: 0.275
2015 SCImago Journal Rankings: 0.199

 

DC FieldValueLanguage
dc.contributor.authorWu, Qen_US
dc.contributor.authorLi, CXen_US
dc.contributor.authorLi, XCen_US
dc.contributor.authorLi, YHen_US
dc.date.accessioned2012-10-08T03:10:07Z-
dc.date.available2012-10-08T03:10:07Z-
dc.date.issued2001en_US
dc.identifier.citationSpectroscopy And Spectral Analysis, 2001, v. 21 n. 6, p. 778-782en_US
dc.identifier.citation光譜學與光譜分析, 2001, v. 21 n. 6, p. 778-782-
dc.identifier.issn1000-0593en_US
dc.identifier.urihttp://hdl.handle.net/10722/167694-
dc.description.abstractThermal spectra of liquid crystal, dodecyloxy benzoic acid were collected over a temperature range of 26-150 degrees C by FTIR microspectroscopy. By taking investigations of temperature-induced changes in dodecyloxy benzoic acid by means of 2D infrared correlation spectroscopy, it was possible to clearly describe the molecular dynamic mechanism of dodecyloxy benzoic acid aggregates in the phase transitions. The analysis shows that p-dodecyloxy benzoic acid crystallized as multi-molecule aggregates through hydrogen bonds between the carboxylic groups, while the long polymethylene residues intermixed each other in solid state. Premelting phenomena in polymethylene residues were observed with temperature up to melting point. It seems that lots of oxy-benzoic acid part recrystallized to cycle dimer as supermolecular liquid crystal during alkyl chain melting in crystal-smectic phase transition. After temperature over 132 degrees C, oxy-benzoic acid part were melted to open dimer and separate molecule in liquid state.en_US
dc.description.abstract利用顯微紅外光譜技術在寬范圍的溫度區域跟蹤對十二烷氧基苯甲酸相變過程 ,經二維相關紅外光譜分析 ,來描述對十二烷氧基苯甲酸在不同溫度區間的分子動態變化。結果認為固態由烷基相互纏結以多種羧酸聚集體的狀態存在 ,95℃發生的相轉變主要是非均相的十二烷基熔融和氧基苯甲酸部分重結晶的過程 ,132℃以后的相轉變主要是羧酸聚集體部分氫鍵集中斷裂和羧酸苯醚基團迅速熔融的結果。-
dc.languagechien_US
dc.relation.ispartofSpectroscopy And Spectral Analysisen_US
dc.relation.ispartof光譜學與光譜分析-
dc.subject2D-FTIR (二維紅外相關光譜)-
dc.subjectDodecyloxy Benzoic Acid (對十二烷氧基苯甲酸)-
dc.subjectFTIR Microspectroscopy (顯微紅外)-
dc.subject.meshBenzyl Compounds - Chemistryen_US
dc.subject.meshEthers - Chemistryen_US
dc.subject.meshHydrogen Bondingen_US
dc.subject.meshPhase Transitionen_US
dc.subject.meshSpectroscopy, Fourier Transform Infrared - Methodsen_US
dc.titleTwo-dimensional infrared correlation spectroscopy on dodecyloxy benzoic acid phase transitionen_US
dc.title二維紅外相關光譜分析對十二烷氧基苯甲酸的相變過程-
dc.typeArticleen_US
dc.identifier.emailLi, XC:xuechenl@hku.hken_US
dc.identifier.authorityLi, XC=rp00742en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.pmid12958893-
dc.identifier.scopuseid_2-s2.0-0035726436en_US
dc.identifier.volume21en_US
dc.identifier.issue6en_US
dc.identifier.spage778en_US
dc.identifier.epage782en_US
dc.identifier.scopusauthoridWu, Q=35468560800en_US
dc.identifier.scopusauthoridLi, CX=8931261400en_US
dc.identifier.scopusauthoridLi, XC=24168958800en_US
dc.identifier.scopusauthoridLi, YH=7502089551en_US
dc.customcontrol.immutablecsl 130805-

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