The temperature-dependent red-shift of the visible absorption spectra of crystal violet in alcohol solutions

1984 ◽  
Vol 104 (4) ◽  
pp. 373-377 ◽  
Author(s):  
J. Korppi-Tommola ◽  
E. Kolehmainen ◽  
E. Salo ◽  
R.W. Yip
Keyword(s):  
Absorption Spectra ◽  
Crystal Violet ◽  
Red Shift ◽  
Temperature Dependent ◽  
Visible Absorption

scholarly journals Influence of TiO2Nanocrystals Fabricating Dye-Sensitized Solar Cell on the Absorption Spectra of N719 Sensitizer

2012 ◽  
Vol 2012 ◽  
pp. 1-7 ◽  
Author(s):  
Puhong Wen ◽  
Yinfeng Han ◽  
Weixing Zhao
Keyword(s):  
Solar Cell ◽  
Absorption Spectra ◽  
Red Shift ◽  
Dye Sensitized Solar Cell ◽  
Utilization Rate ◽  
Visible Absorption ◽  
Dye Sensitized ◽  
Ligand Charge Transfer ◽  
Charge Transfer Transitions ◽  
Mlct Band

The absorption spectra of N719 sensitizer anchored on the films prepared by TiO2nanocrystals with different morphology and size were investigated for improving the performance of dye-sensitized solar cell (DSC). We find that the morphology and size of TiO2nanocrystals can affect the UV-vis and FT-IR spectra of the sensitizer anchored on their surfaces. In particular, the low-energy metal-to-ligand charge-transfer transitions (MLCT) band in the visible absorption spectra of N719 is strongly affected, and locations of these MLCT bands revealed larger differences. The results indicate that there is a red shift of MLCT band in the spectra obtained by using TiO2nanocrystals with long morphology and large size compared to that in solution. And it produced a larger red-shift on the MLCT band after TiO2nanocrystals with small size mixed with some long nanocrystals. Accordingly, the utilization rate to visible light is increased. This is a reason why the DSC prepared by using such film as a photoelectrode has better performance than before mixing.

CO-ORDINATION COMPOUNDS OF NICKEL(II): PART I. THE SPECTRA OF SALICYLALDIMINE DERIVATIVES OF NICKEL(II) IN SOME ORGANIC SOLVENTS

1959 ◽  
Vol 37 (2) ◽  
pp. 436-443 ◽  
Author(s):  
H. C. Clark ◽  
R. J. O'Brien
Keyword(s):  
Field Theory ◽  
Carbon Tetrachloride ◽  
Absorption Spectra ◽  
Organic Solvents ◽  
Ligand Field ◽  
Temperature Dependent ◽  
Visible Absorption ◽  
Ligand Field Theory ◽  
Recent Developments ◽  
Derivatives Of

Measurements of the ultraviolet and visible absorption spectra of bis-N-methyl-salicylaldimine nickel(II) and its 5-chloro and 5-bromo derivatives in benzene, chloroform, carbon tetrachloride, and cyclohexane solutions at temperatures between 15° and 45 °C are reported. The results confirm the occurrence of a temperature dependent equilibrium between dia- and para-magnetic forms. The nature of the paramagnetic form is discussed in terms of the recent developments of the ligand field theory. The effect on the equilibrium of substitution of chlorine or bromine in the five position of the salicylaldehyde molecule is also discussed.

scholarly journals Temperature dependent poly(L-lactide) crystallization investigated by Fourier transform terahertz spectroscopy

2021 ◽  
Author(s):  
Seiichiro Ariyoshi ◽  
Satoshi Ohnishi ◽  
Hikaru Mikami ◽  
Hideto Tsuji ◽  
Yuki Arakawa ◽  
...  
Keyword(s):  
Fourier Transform ◽  
Absorption Spectra ◽  
Terahertz Spectroscopy ◽  
Thz Spectroscopy ◽  
Frequency Range ◽  
Temperature Dependent ◽  
Thz Absorption

Poly(L-lactide) (PLLA) was investigated by Fourier transform terahertz (THz) spectroscopy over the frequency range of 1.0 – 8.5 THz. THz absorption spectra were acquired for PLLA samples isothermally crystallized at...

Quinoline-annulated chlorins and chlorin-analogs

2016 ◽  
Vol 20 (01n04) ◽  
pp. 265-273 ◽  
Author(s):  
Joshua Akhigbe ◽  
Mengxi Yang ◽  
Michael Luciano ◽  
Christian Brückner
Keyword(s):  
Absorption Spectra ◽  
Functional Group ◽  
Bathochromic Shift ◽  
Red Shift ◽  
Simple Strategy

The OsO4-mediated dihydroxylation of quinoline-annulated porphyrin generates a quinoline-annulated dihydroxychlorin in a regioselective fashion. Its dihydroxypyrroline moiety, located at the opposite of the annulated pyrrole, is susceptible to the same functional group interconversions we previously demonstrated for non-annulated dihydroxychlorins: oxidations to the corresponding dione, lactone, and dialkoxymorpholine derivatives. The quinoline-annulated chlorin and derivatives are all characterized by absorption spectra that are much broadened and between 130 and 220 nm red-shifted compared to their non-annulated analogs. Absorbance maxima in the NIR up to well above 800 nm were recorded. We attribute the bathochromic shift to their extended [Formula: see text]-systems and inferred non-planarity, highlighting that quinoline-annulation is a particularly effective and simple strategy to red-shift the absorption spectra of chlorins and chlorin analogs.

Influence of Electron Injection Rate in Triphenylamine Based Dye for Dye-Sensitized Solar Cells: A First Principle Study

2019 ◽  
Vol 233 (9) ◽  
pp. 1247-1259
Author(s):  
Madhu Prakasam
Keyword(s):  
Solar Cells ◽  
Absorption Spectra ◽  
Density Functional ◽  
Dye Sensitized Solar Cells ◽  
Visible Region ◽  
Electron Injection ◽  
Injection Rate ◽  
Visible Absorption ◽  
Dye Sensitized ◽  
Sensitized Solar Cells

Abstract In this work, we systematically investigate the impacts of electron-donor based on Triphenylamine (TPA). The Geometry structure, energy levels, light-harvesting ability and ultraviolet-visible absorption spectra were calculated by using Density Functional Theory (DFT) and Time-Dependent-DFT. The electron injection rate of the TPA-N(CH3)2 based dyes has 0.71 eV for high among the dye sensitizer. The First and Second order Hyperpolarizability of the 11.95 × 10−30 e.s.u and 12195.54 a.u, respectively for TPA-N(CH3)2 based dye. The calculated absorption spectra were showed in the ultra-violet visible region for power conversion region. The study reveals that the electron transfer character of TPA-N(CH3)2 based dyes can be made suitable for applications in Dye-Sensitized Solar Cells.

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