Spectrochimica acta. Part A: Molecular spectroscopy最新文献_第9页

Etude des premières bandes d'absorption S0→S1 et S0→S2 du 5-méthoxyindole 5-甲氧基吲哚第一个吸收带S0→S1和S0→S2的研究

Spectrochimica acta. Part A: Molecular spectroscopy Pub Date : 1994-09-01 DOI: 10.1016/0584-8539(94)80183-5

A Kadiri, B Kabouchi

引用次数: 0

Vibrational assignment and analysis for 2,3-dihydrofuran and 2,5-dihydrofuran 2,3-二氢呋喃和2,5-二氢呋喃的振动赋值与分析

Spectrochimica acta. Part A: Molecular spectroscopy Pub Date : 1994-09-01 DOI: 10.1016/0584-8539(94)80178-9

T.D. Klots, W.B. Collier

引用次数: 23

Colloqium spectrocopicum internationale XXIX 国际光谱学研讨会 XXIX

Spectrochimica acta. Part A: Molecular spectroscopy Pub Date : 1994-09-01 DOI: 10.1016/0584-8539(94)80187-8

引用次数: 0

Spectral, lifetime and photochemical characteristics of 4-acetoxy-chalcone in viscous media 粘性介质中4-乙氧基查尔酮的光谱、寿命和光化学特性

Spectrochimica acta. Part A: Molecular spectroscopy Pub Date : 1994-07-01 DOI: 10.1016/0584-8539(94)80087-1

Samy A. El-Daly, El-Zeiny M. Ebied, Guy Duportail

引用次数: 4

Vibrational circular dichroism studies of molecular conformation and association of dipeptides 二肽分子构象和缔合的振动圆二色性研究

Spectrochimica acta. Part A: Molecular spectroscopy Pub Date : 1994-07-01 DOI: 10.1016/0584-8539(94)E0061-E

Mitsuhiro Miyazawa, Yoshimasa Kyogoku, Hiromu Sugeta

{"title":"Vibrational circular dichroism studies of molecular conformation and association of dipeptides","authors":"Mitsuhiro Miyazawa, Yoshimasa Kyogoku, Hiromu Sugeta","doi":"10.1016/0584-8539(94)E0061-E","DOIUrl":"10.1016/0584-8539(94)E0061-E","url":null,"abstract":"<div>Vibrational circular dichroism (VCD) and infrared (IR) absorption spectra in the NH stretching region have been measured for the dipeptides, R′COAANHR′'(R′ = Me and tertBu; AA = Ala, Leu, Val and Phe; R′' = Me, isoBu and neoPe). Analyses of the VCD and absorption spectra indicated that the VCD bands for the NH stretching are quite sensitive to the state of hydrogen bonding as well as the local conformation of oligopeptides. VCD spectra exhibit a negative VCD band at 3420-3405 cm−1 due to the C5 conformer with an intramolecularly hydrogen-bonded five-membered ring. The intermolecularly hydrogen-bonded NH stretching vibration exhibits a characteristic negative—positive couplet from the high wavenumber side due to the antiparallel C5C5 dimer formation. Hydrogen-bonded oligomers beyond the dimer formed in highly concentrated solutions give rise to an additional negative VCD band on the lower wavenumber side of the hydrogen-bonded absorption band.</div>","PeriodicalId":82782,"journal":{"name":"Spectrochimica acta. Part A: Molecular spectroscopy","volume":"50 8","pages":"Pages 1505-1511"},"PeriodicalIF":0.0,"publicationDate":"1994-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0584-8539(94)E0061-E","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74655199","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 13

Introduction to Spectrochimica Acta Part A biomolecular spectroscopy 光谱化学导论，生物分子光谱学

Spectrochimica acta. Part A: Molecular spectroscopy Pub Date : 1994-07-01 DOI: 10.1016/0584-8539(94)80084-7

A.J. Hoff, J.R. Norris

引用次数: 0

Electronic spectra of o-, m- and p-tolunitrile—substituent effect on internal rotation of the methyl group o-、m-和对甲基取代基对甲基内旋影响的电子谱

Spectrochimica acta. Part A: Molecular spectroscopy Pub Date : 1994-07-01 DOI: 10.1016/0584-8539(94)E0052-C

Masaaki Fujii , Masayo Yamauchi, Ken Takazawa , Mitsuo Ito

{"title":"Electronic spectra of o-, m- and p-tolunitrile—substituent effect on internal rotation of the methyl group","authors":"Masaaki Fujii , Masayo Yamauchi, Ken Takazawa , Mitsuo Ito","doi":"10.1016/0584-8539(94)E0052-C","DOIUrl":"10.1016/0584-8539(94)E0052-C","url":null,"abstract":"<div>The S1 ← S0 fluorescence excitation spectra and the S1→S0 dispersed fluorescence spectra of o-, m-and p-tolunitrile were measured in supersonic jets. Low-frequency bands due to internal rotation of the methyl group were observed in m- and p-tolunitrile. Observed band positions and relative intensities of the internal rotational bands were reproduced by a calculation using a free rotor basis set. From the analysis, the potential curve of the internal rotation was determined in both S1 and S0. It was found that the barrier height increases in going from S0 to S1 in m-tolunitrile, while it decreases in p-tolunitrile. In contrast, no low-frequency band was found in o-tolunitrile. It is concluded that the potential curve in o-tolunitrile does not change in going from S0 to S1. The change of the barrier height by electronic excitation in tolunitriles differs greatly from that observed in other toluene derivatives. It is suggested that the electronic properties of a substituent are important for the methyl rotation in the excited state.</div>","PeriodicalId":82782,"journal":{"name":"Spectrochimica acta. Part A: Molecular spectroscopy","volume":"50 8","pages":"Pages 1421-1433"},"PeriodicalIF":0.0,"publicationDate":"1994-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0584-8539(94)E0052-C","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79952550","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 34

UV spectroscopy: Techniques, instrumentation, data handling 紫外光谱学:技术、仪器、数据处理

Spectrochimica acta. Part A: Molecular spectroscopy Pub Date : 1994-07-01 DOI: 10.1016/0584-8539(94)80101-0

B. Slater

引用次数: 3

Infrared spectroscopic evidence of an iron(II)—carbonate complex on the surface of pyrite 黄铁矿表面碳酸盐铁络合物的红外光谱证据

Spectrochimica acta. Part A: Molecular spectroscopy Pub Date : 1994-07-01 DOI: 10.1016/0584-8539(94)80100-2

V.P. Evangelou, X. Huang

引用次数: 28

Infrared diode laser spectroscopy of the Δυ = 2 band of NaBr using spectrum processing by Fourier transformation 利用傅里叶变换对NaBr Δυ = 2波段的红外二极管激光光谱进行处理

Spectrochimica acta. Part A: Molecular spectroscopy Pub Date : 1994-07-01 DOI: 10.1016/0584-8539(94)E0049-G

Hiromichi Uehara, Koui Horiai, Yasushe Ozaki, Toici Konno

引用次数: 3