Nonlinear susceptibility of a cyanobiphenyl derivative at the air/water interface: Improved measurement of molecular orientation by optical second harmonic generation

Article Abstract:

The nonlinear susceptibility tensor, chi(super 2), for second harmonic generation (SHG) by a monolayer of the cyanobiphenyl derivative 4-n-octyl-4'-cyanobiphenyl (8CB) at the air/water interface was measured with the fundamental frequency equal to 1.55 eV. The contribution of the water subphase was estimated by measuring the magnitudes and relative phases of the nonlinear susceptibilities of the bare and monolayer-covered water surfaces.

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Use of UV-vis reflection spectroscopy for determining the organization of viologen and viologen tetracyanoquinodimethanide monolayers

Article Abstract:

UV-vis reflection spectroscopy is used for proving in situ the organization of pure viologen and hybrid viologen tetracyanoquinodimethanide monolayers at the air-water interface. A gradual transition of the viologen molecules from a flat orientation in the gas phase to a more tilted position with respect to the water surface in the condensed phases occurs.

Reflectance spectroscopy

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Solvation in binary mixtures of water and polar aprotic solvents: Theoretical calculations of the concentrations of solvent-water hydrogen-bonded species and application to thermosolvatochromism of polarity probes

Article Abstract:

The thermo-solvatochromism of two polarity probes, 2,6-diphenyl-4-(2,4,6-triphenyl-pyridinium-1-yl)phenolate and 2,6-dichloro-4-(2,4,6-triphenylpyridinium-1-yl) phenolate in aqeous acetone and aqueous dimethyksulfoxide is studied. It is found that temperature increase resulted in desolvation of both probes.

Spectra, Thermal properties, Ultraviolet spectroscopy, Thermochromism

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