Non-linear optical activity of porphyrin aggregate at the liquid/liquid interface

Fujiwara, K.; Monjushiro, Hideaki; Watarai, Hitoshi

doi:10.1016/j.cplett.2004.07.018

Cited by 42 publications

(44 citation statements)

References 17 publications

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“…17,19,23 At first, we confirmed the aggregation of TPPS molecules in acidic solutions by absorption spectroscopy. Figure 6 shows absorption spectra of diprotonated TPPS solutions in 0.2 M HCl at different TPPS concentrations from 1.16 × 10 -6 M to 1.39 × 10 -5 M. Since green precipitates or aggregates were observed after 12 h in the higher concentrations over 2 × 10 -5 M, the absorption spectra were examined only in the lower concentrations.…”

Section: Resultssupporting

confidence: 53%

Raman Microprobe Spectrometer Installed in a Super-Conducting Magnet

2006

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A Raman microprobe spectrometer that could be installed in the bore of a cryogen free super-conducting magnet (10 T) was designed and constructed for the investigation of the external magnetic field effect on the Raman spectra of molecular aggregates in solutions and at interfaces. The performance of the present instrument was demonstrated by measuring the magnetic field effect (0 -10 T) on the resonance Raman spectra of diprotonated meso-tetra-(sulfonatophenyl)porphine aggregates in an acidic solution. The Raman shifts of the aggregates were not significantly influenced even in 10 T. However, the relative intensity of 1123 cm -1 peak (ν (Ca-N)) was interestingly enhanced about 20% under the magnetic fields higher than 2.5 T.

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Section: Resultssupporting

confidence: 53%

Raman Microprobe Spectrometer Installed in a Super-Conducting Magnet

2006

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“…Recently, the second harmonic generation-circular dichroism (SHG-CD) has been developed in our laboratory to measure the optical activity at liquid/liquid interfaces, taking advantage of the remarkable interfacial selectivity of SHG. 2 In the present study, we propose a conventional and reliable method to measure the CD spectra at a liquid/liquid interface.…”

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confidence: 99%

Measurement of Circular Dichroism Spectra of Liquid/Liquid Interface by Centrifugal Liquid Membrane Method

et al. 2004

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“…[18,19] This interface has some specific functions that are not found in the bulk phases, such as orientational adsorption, two-dimensional concentration, and interfacial aggregation. [20,21] Molecular self-organization and site-selective orientation at the liquid/liquid interface are predominant motifs in the application of interfacial phenomena for novel material design, biological systems, as well as their related science and technology. For instance, as dye molecules could be aligned as aggregates at the liquid/ liquid interface, they may be used as nanometer-sized molecular devices in which transition dipoles are oriented in one direction.…”

Section: Introductionmentioning

confidence: 99%

Site‐Selective Formation of Optically Active Inclusion Complexes of Alkoxo‐Subphthalocyanines with β‐Cyclodextrin at the Toluene/Water Interface

Adachi

Watarai

2006

Chemistry A European J

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Several subphthalocyanine derivatives that contain an alkoxo substituent as an axial ligand (RO-Subpc, R = 9-anthracenemethyl, benzyl, phenyl, 3,5-dimethylbenzyl, 3,5-dimethylphenyl, 4-methylbenzyl, and 4-methylphenyl) were synthesized. The formation of inclusion complexes of RO-Subpc with beta-CD in DMSO and at the toluene/water interface was investigated by UV/Vis absorption spectroscopy, induced circular dichroism (ICD), and nuclear magnetic resonance (NMR) measurements. Interfacial tension measurements suggested that beta-CD adsorbed as a monolayer at the toluene/water interface and probably orientated towards the toluene phase with its primary face. The 1:1 composition of beta-CD.RO-Subpc inclusion complexes was confirmed in DMSO and at the toluene/water interface for BzO-Subpc, PhO-Subpc, MeBzO-Subpc, and MePhO-Subpc. A 2:1 inclusion complex of AnO-Subpc formed in DMSO. The observed ICD spectra of beta-CDRO-Subpc inclusion complexes are discussed with respect to molecular modeling and the simulation based on Tinoco-Kirkwood theory. Interestingly, the ICD spectra of beta-CD.BzO-Subpc and beta-CD.MeBzO-Subpc inclusion complexes exhibited a negative sign in DMSO and a positive sign at the toluene/water interface. This reversal of the ICD sign strongly suggests a difference in the structure of the inclusion complexes: beta-CD at the interface formed the inclusion complex with its primary face, whereas the secondary face of beta-CD bound favorably to RO-Subpc in DMSO.

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Non-linear optical activity of porphyrin aggregate at the liquid/liquid interface

Cited by 42 publications

References 17 publications

Raman Microprobe Spectrometer Installed in a Super-Conducting Magnet

Raman Microprobe Spectrometer Installed in a Super-Conducting Magnet

Measurement of Circular Dichroism Spectra of Liquid/Liquid Interface by Centrifugal Liquid Membrane Method

Site‐Selective Formation of Optically Active Inclusion Complexes of Alkoxo‐Subphthalocyanines with β‐Cyclodextrin at the Toluene/Water Interface

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