Langmuir Film-Forming and Second Harmonic Generation Properties of Lanthanide Complexes

Huang, Chunhui; Wang, Kezhi; Xu, Guangyang; Zhao, Xiao; Xie, Xiaoming; Yu, Xu; Liu, Yunqi; Xu, Liguang; Li, Tiankai

doi:10.1021/j100039a029

Cited by 60 publications

(29 citation statements)

References 10 publications

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“…10 In the present study, the wavelength of the second harmonic (650 nm) is further away from the wavelength of maximum absorption in solution (493 nm), leading to a much smaller enhancement factor. To be able to compare the hyperpolarizability values obtained at different fundamental wavelengths λ fund , the static hyperpolarizability 0 , corrected for the resonance enhancement, can be calculated on the basis of the wavelength of maximum absorption λ max for the noncentrosymmetric chargetransfer band and the two-level model: 22 With this correction factor and the wavelength of maximum absorption λ max from the spectra shown in Figure 3, we arrive at 0 values for our BMPP complexes of (31 ( 1) × 10 -30 esu, while the previously obtained value for the 4-[4-(dimethylamino)styryl]-1-hexadecylpyridinium iodide from LB films 9 results in a 0 value ranging from 30 × 10 -30 to 45 × 10 -30 esu. It is clear, then, that the larger hyperpolarizability values for the complexes with lanthanide counteranions calculated from the film susceptibility are overestimated, due to the positive influence of the better film-forming properties for the latter complexes.…”

Section: Resultsmentioning

confidence: 60%

Molecular First Hyperpolarizability Data for Lanthanate Complexes Containing the Hemicyanine Chromophore

et al. 2001

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The molecular nonlinear optical polarizability, or first hyperpolarizability , of four lanthanate complexes containing the hemicyanine 1-hexadecyl-4-{2-[4-(dimethylamino)phenyl]ethenyl}pyridinium chromophore has been determined with high precision. The experimental measurement of the phase shift and the demodulation between immediate hyper-Rayleigh scattering and time-delayed multiphoton fluorescence as a function of modulation frequency allows for the simultaneous data analysis of phase and demodulation toward precise values for fluorescence-free hyperpolarizability, multiphoton fluorescence contribution, and fluorescence lifetime. One order of magnitude improvement in precision is obtained with respect to the earlier analysis of demodulation data only. This level of precision has been used to show the relative impact of f-orbital filling and ligands on the molecular second-order nonlinear optical response of lanthanate complexes containing a hemicyanine chromophore. Implications for the earlier conclusions about better film formation for lanthanate complexes are discussed.

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Section: Resultsmentioning

confidence: 60%

Molecular First Hyperpolarizability Data for Lanthanate Complexes Containing the Hemicyanine Chromophore

et al. 2001

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“…The secondharmonic generation (SHG) experiment shows that there is a tilt angle of 44°of the chromophores, relative to the normal of the substrate, 10 which is similar to that obtained from films of the hemicyanine halides. 9,11 The electronic absorption spectra of the P 3 n LB film is shown in Figure 2a. The λ max occurs at ca.…”

Section: Characterization Of Lb Film and Dye-ito Electrodementioning

confidence: 99%

Light-Induced Electron Transfer on a Trichromophore Dye Modified ITO Electrode

Wu¹,

Huang²,

Gan³

et al. 1999

J. Phys. Chem. B

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A novel trichromophore amphiphilic dye N-methyl-2,4,6-tri-(4-dioctadecylamino)stilbazolium iodide (P 3 n) has been synthesized and successfully transferred on semiconducting transparent indium-tin oxide (ITO) electrodes by a Langmuir-Blodgett (LB) technique. Photocurrent generation was studied in a conventional photoelectrochemical cell. An action spectrum of the photocurrent generation is coincident with the absorption spectrum of the LB film-modified electrode, indicating that the dye aggregate in the LB film is responsible for the photocurrent. Some factors that may affect the observed photocurrent, such as the presence of O 2 , the concentrations of methyl viologen (MV 2+ ) and hydroquinone (H 2 Q), pH, and the bias voltage have been investigated. Models for the mechanism of light-induced electron transfer under different conditions are proposed.

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“…The inset Fig. 4 shows a plotter absorbance at 294 nm against number of layers deposited, the linear dependence of the absorbance on the number of layers can be obtained for 11, 21 and 31 layers LB films; considering that the intensity of absorption is determined by the amount of the complex a deviation from linearity was observed just for one layer LB deposited, it could be explained by the sensitivity of UV-vis measurements [16,17]. Fig.…”

Section: Monolayer Behaviors and Lb Film Fabricationmentioning

confidence: 94%