摘要:

Abstract—In contrast with previous reports from other laboratories, four isomeric dimers were isolated from the photochemical reaction of thymine sensitized by either acetone or propiophenone. Product analyses, made by use of nuclear magnetic resonance spectroscopy, showed that the distribution of dimers is dependent on the character of the solvent medium. Mass spectra for all four dimers were obtained and are here presente

ISSN:0031-8655    

DOI:10.1111/j.1751-1097.1970.tb05991.x

出版商:Blackwell Publishing Ltd    

年代:1970

数据来源: WILEY

ISSN:0031-8655    

DOI:10.1111/j.1751-1097.1970.tb05992.x

出版商:Blackwell Publishing Ltd    

年代:1970

数据来源: WILEY

摘要:

Abstract—In dimethylsulfoxide the emission spectrum of luminol chemiluminescence is red‐shifted by 300 cm‐1from the photoexcited fluorescence of the product 3‐aminophthalate dianion, while in aqueous solvent the two spectra are identical. The spectral properties of the product dianion have been measured in aqueous solvent and in a number of aprotic solvents, both at room temperature and at 77°K. The ground states and the excited states from which emissions are observed are characterized. Two alternatives are presented to explain the aprotic emission

ISSN:0031-8655    

DOI:10.1111/j.1751-1097.1970.tb05993.x

出版商:Blackwell Publishing Ltd    

年代:1970

数据来源: WILEY

摘要:

Abstract—5‐Methylcytosine and 5‐methyldeoxycytidylic acid are fluorescent in aqueous solution at room temperature and neutral pH. 5‐Methylcytosine, 10‐3M, pH 8.5, 25°C, has a quantum yield of 5 ×10‐4, 5‐Methyldeoxycitydylic acid, 10‐4M, pH 7.5, 20°C, has a quantum yield of 8 × 10‐4. Emission maxima are 2.91 and 2.80μ‐1. At pH 14, the quantum yield of 5‐methylcytosine is 1.6 × 10‐2; the emission maximum is 2.82μ‐1. At pH I, the quantum yield of both compounds is less than or equal to 10‐4. Both compounds were chromatographically homogeneous, had absorption spectra which agreed with published data, and excitation spectra which agre

ISSN:0031-8655    

DOI:10.1111/j.1751-1097.1970.tb05994.x

出版商:Blackwell Publishing Ltd    

年代:1970

数据来源: WILEY

摘要:

Abstract—U.V. irradiation oftrans‐urocanic acid frozen in an ice matrix results intrans, trans, trans‐2,4‐di‐imidazolyl‐1,3‐cyclobutanedicarboxylic acid from pH 8.0 solutions; orcis, trans, cis‐3, 4‐di‐imidazolyl‐1, 2‐cyclobutanedicarboxylic aci

ISSN:0031-8655    

DOI:10.1111/j.1751-1097.1970.tb05995.x

出版商:Blackwell Publishing Ltd    

年代:1970

数据来源: WILEY

ISSN:0031-8655    

DOI:10.1111/j.1751-1097.1970.tb05996.x

出版商:Blackwell Publishing Ltd    

年代:1970

数据来源: WILEY

ISSN:0031-8655    

DOI:10.1111/j.1751-1097.1970.tb05997.x

出版商:Blackwell Publishing Ltd    

年代:1970

数据来源: WILEY

ISSN:0031-8655    

DOI:10.1111/j.1751-1097.1970.tb05998.x

出版商:Blackwell Publishing Ltd    

年代:1970

数据来源: WILEY

ISSN:0031-8655    

DOI:10.1111/j.1751-1097.1970.tb05999.x

出版商:Blackwell Publishing Ltd    

年代:1970

数据来源: WILEY

ISSN:0031-8655    

DOI:10.1111/j.1751-1097.1970.tb06000.x

出版商:Blackwell Publishing Ltd    

年代:1970

数据来源: WILEY