DC Field | Value | Language |
---|---|---|
dc.contributor.advisor | Shim, Sang-Chul | - |
dc.contributor.advisor | 심상철 | - |
dc.contributor.author | Jeong, Bong-Mo | - |
dc.contributor.author | 정봉모 | - |
dc.date.accessioned | 2011-12-13T04:59:03Z | - |
dc.date.available | 2011-12-13T04:59:03Z | - |
dc.date.issued | 1991 | - |
dc.identifier.uri | http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=67641&flag=dissertation | - |
dc.identifier.uri | http://hdl.handle.net/10203/32611 | - |
dc.description | 학위논문(석사) - 한국과학기술원 : 화학과, 1991.2, [ vi, 47 p. ] | - |
dc.description.abstract | Direct irradiation of 5,7-dimethoxycoumarin (DMC) under N$_2$ produced three dimers such as anti head-to-head, syn head-to-head, and syn headto-tail. Relative yields of the three dimers changed with solvent polarity varying. In nonpolar solvents such as benzene, relative yield of anti head-to-head dimer is larger, while in polar solvents such as methyl alcohol syn head-to-tail and syn head-to-head dimer. Also, as solvent polarity increases from benzene to methyl alcohol, overall yields of dimers increase. In nonpolar solvents, rata of self-quenching is faster, while in polar solvents the rate of dimerization relative to self-quenching is faster. In the presence of triplet sensitizers such as benzophenone, the anti head-to-head dimer is formed exclusively in non-polar solvents but with traces of syn dimers in polar solvents. From sensitization and quenching experiments using azulene. We concluded that anti head-to-head dimer was formed via excited singlet state and syn dimers were formed via both excited singlet and triplet states. MAC 89463 9127 | eng |
dc.language | eng | - |
dc.publisher | 한국과학기술원 | - |
dc.title | Photodimerization of 5,7-dimethoxycoumarin | - |
dc.title.alternative | 5,7-디메톡시쿠마린의 광이합체화 반응에 대한 연구 | - |
dc.type | Thesis(Master) | - |
dc.identifier.CNRN | 67641/325007 | - |
dc.description.department | 한국과학기술원 : 화학과, | - |
dc.identifier.uid | 000891448 | - |
dc.contributor.localauthor | Shim, Sang-Chul | - |
dc.contributor.localauthor | 심상철 | - |
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