The Experts below are selected from a list of 69 Experts worldwide ranked by ideXlab platform
Zhen-long Zhang - One of the best experts on this subject based on the ideXlab platform.
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Surface-enhanced Raman scattering of 4-Dimethylaminoazobenzene on copper surface
Proceedings of 2011 International Conference on Electronics and Optoelectronics, 2011Co-Authors: Zhen-long Zhang, Baoquan MenAbstract:In this paper, surface-enhanced Raman spectrum of 4-Dimethylaminoazobenzene adsorbed on the copper surface was investigated. The normal Raman and surface-enhanced Raman peaks were assigned according to some reports. Based on the spectra analysis, the adsorption of DAB molecule on copper surface is proposed.
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Single molecule detection of 4-Dimethylaminoazobenzene by surface-enhanced Raman spectroscopy
Journal of Molecular Structure, 2008Co-Authors: Zhen-long Zhang, Y.f. Yin, J.w. JiangAbstract:Abstract 4-Dimethylaminoazobenzene (DAB) is anticipated to be a human carcinogen based on sufficient evidence of carcinogenicity in experimental animals. The trace detection of DAB is of great significance in environmental protection and safe life of the people. To test the availability of DAB trace detection using surface-enhanced Raman scattering (SERS), the SERS spectra of DAB single molecules adsorbed on the silver particle aggregates in colloid were investigated. The phenomena of blinking, spectral diffusion, and intensity fluctuations of the vibrational lines in the SERS spectra were observed. Statistical analysis of spectral intensity fluctuations indicates a multimodal distribution of some specific Raman bands, which are consistent with the identification of single molecule detection. Our results demonstrated that SERS can be applied to the trace detection of DAB molecules and other azo dyes.
Koki Kunimoto - One of the best experts on this subject based on the ideXlab platform.
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crystal structure of 4 Dimethylaminoazobenzene 4 sulfonyl l tryptophan dimethylsulfoxide solvate
Analytical Sciences: X-ray Structure Analysis Online, 2004Co-Authors: Chizuru Sasaki, Sohichi Kitoh, Hiroshige Hayashi, Koki KunimotoAbstract:Crystals of 4-Dimethylaminoazobenzene-4′-sulfonyl-L-tryptophan dimethylsulfoxide solvate (Dabs-Trp·DMSO) are monoclinic, space group P21 with a = 12.941(6)A, b = 7.760(3)A, c = 14.131(7)A, β = 103.161(8)° and Z = 2. The structure was solved by direct methods (SIR88) and refined to a final R value of 0.058 for 3152 reflections (I > 2.00σ(I)). The molecular geometries and conformations are comparable to the typical values of azobenzene and L-tryptophan. The DMSO molecule is involved in the intermolecular hydrogen bonds with the sulfonamide NH and the carboxyl OH groups of different Dabs-Trp molecules. The hydrogen-bonded chains propagate along the b axis, and are constructed from molecules related by a two-fold screw axis. The sulfonamide S=O and the carboxyl C=O groups do not participate in hydrogen bonding.
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crystal structure of 2 trifluoromethyl 4 Dimethylaminoazobenzene
Analytical Sciences: X-ray Structure Analysis Online, 2003Co-Authors: Chizuru Sasaki, Sohichi Kitoh, Kazuya Yamada, Koki Kunimoto, Shiro Maeda, Akio Kuwae, Kazuhiko HanaiAbstract:Crystals of 2-trifluoromethyl-4′-Dimethylaminoazobenzene (2-TFMDAB) are orthorhombic, space group Pbca with a =15.625(4), b = 23.028(6), c = 7.685(2)A, and Z = 8. The structure was solved by direct methods (SIR88) and refined to a final R value of 0.049 for 2536 reflections (I>0.80σ(I)). 2-TFMDAB has a trans geometry about the azo linkage. The bond lengths and angles are similar to those of other azobenzene compounds. The abnormal UV-vis absorption spectrum in an acidic solution can be explained by the existence of the bulky and electronegative CF3 group at the 2-position, which prevents protonation at the Nβ atom of the azo group in an acidic solution.
Kunimoto Koki - One of the best experts on this subject based on the ideXlab platform.
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Crystal Structure of 4-Dimethylaminoazobenzene-4′-sulfonyl-L-tryptophan Dimethylsulfoxide Solvate
日本分析化学会 = The Japan Society for Analytical Chemistry, 2004Co-Authors: Sasaki Chizuru, Kitoh Soh-ichi, Hayashi Hiroshige, Kunimoto KokiAbstract:Crystals of 4-Dimethylaminoazobenzene-4′-sulfonyl-L-tryptophan dimethylsulfoxide solvate (Dabs-Trp·DMSO) are monoclinic, space group P21 with a = 12.941(6)Å, b = 7.760(3)Å, c = 14.131(7)Å, β = 103.161(8)° and Z = 2. The structure was solved by direct methods (SIR88) and refined to a final R value of 0.058 for 3152 reflections (I > 2.00σ(I)). The molecular geometries and conformations are comparable to the typical values of azobenzene and L-tryptophan. The DMSO molecule is involved in the intermolecular hydrogen bonds with the sulfonamide NH and the carboxyl OH groups of different Dabs-Trp molecules. The hydrogen-bonded chains propagate along the b axis, and are constructed from molecules related by a two-fold screw axis. The sulfonamide S=O and the carboxyl C=O groups do not participate in hydrogen bonding
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Crystal Structure of 2-Trifluoromethyl-4′-Dimethylaminoazobenzene
日本分析化学会 = The Japan Society for Analytical Chemistry, 2003Co-Authors: Sasaki Chizuru, Kitoh Sohichi, Yamada Kazuya, Kunimoto Koki, Maeda Shiro, Kuwae Akio, Hanai KazuhikoAbstract:Crystals of 2-trifluoromethyl-4′-Dimethylaminoazobenzene (2-TFMDAB) are orthorhombic, space group Pbca with a =15.625(4), b = 23.028(6), c = 7.685(2)Å, and Z = 8. The structure was solved by direct methods (SIR88) and refined to a final R value of 0.049 for 2536 reflections (I>0.80σ(I)). 2-TFMDAB has a trans geometry about the azo linkage. The bond lengths and angles are similar to those of other azobenzene compounds. The abnormal UV-vis absorption spectrum in an acidic solution can be explained by the existence of the bulky and electronegative CF3 group at the 2-position, which prevents protonation at the Nβ atom of the azo group in an acidic solution
Shunzo Yamamoto - One of the best experts on this subject based on the ideXlab platform.
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Effects of pressure on two types of complexations of 4-Dimethylaminoazobenzene with β-cyclodextrin
Zeitschrift für Physikalische Chemie, 2002Co-Authors: Yoshimi Sueishi, Chiharu Yoshioka, Hiroaki Hishikawa, Shunzo YamamotoAbstract:Two types of complexations between β-cyclodextrin (CD) and 4-Dimethylaminoazobenzene were found in methanol-water and in dimethyl sulfoxide-water mixtures. One was an inclusion complex and the other was a lid type. The effects of pressure on the two complexations with β-CD were examined.
J.w. Jiang - One of the best experts on this subject based on the ideXlab platform.
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Single molecule detection of 4-Dimethylaminoazobenzene by surface-enhanced Raman spectroscopy
Journal of Molecular Structure, 2008Co-Authors: Zhen-long Zhang, Y.f. Yin, J.w. JiangAbstract:Abstract 4-Dimethylaminoazobenzene (DAB) is anticipated to be a human carcinogen based on sufficient evidence of carcinogenicity in experimental animals. The trace detection of DAB is of great significance in environmental protection and safe life of the people. To test the availability of DAB trace detection using surface-enhanced Raman scattering (SERS), the SERS spectra of DAB single molecules adsorbed on the silver particle aggregates in colloid were investigated. The phenomena of blinking, spectral diffusion, and intensity fluctuations of the vibrational lines in the SERS spectra were observed. Statistical analysis of spectral intensity fluctuations indicates a multimodal distribution of some specific Raman bands, which are consistent with the identification of single molecule detection. Our results demonstrated that SERS can be applied to the trace detection of DAB molecules and other azo dyes.
