Photophysical properties of pyridinium salts derived from purine bases

1990 ◽  
Vol 68 (12) ◽  
pp. 2164-2170 ◽  
Author(s):  
Bohdan Skalski ◽  
Stefan Paszyc ◽  
Ryszard W. Adamiak ◽  
Ronald P. Steer ◽  
Ronald E. Verrall
Keyword(s):  
Absorption Spectra ◽  
Fluorescence Spectra ◽  
Room Temperature ◽  
Transient Absorption ◽  
Photophysical Properties ◽  
Pyridinium Salts ◽  
Excited Triplet ◽  
Transient Absorption Spectra ◽  
Counter Ions ◽  
Phosphorescence Spectra

The absorption spectra, fluorescence spectra, fluorescence lifetimes, fluorescence quenching, phosphorescence spectra, phosphorescence lifetimes, and picosecond transient absorption spectra of several purinyl-pyridinium salts have been measured in several solvents at room temperature and in ethanol glasses at 77 K. It is concluded that the previously observed photochemical transformation of N-[9-(2′,3′,5′-tri-O-acetyl-β-D-ribofuranosyl)purin-6-yl]pyridinium chloride 1 into the highly fluorescent tri-O-acetylluminarosine 6 occurs via an excited triplet state. It is also shown that intersystem crossing in purinyl-pyridinium salts is induced by an intermolecular charge-transfer interaction with the counter ions. Keywords: purinyl-pyridinium salts, fluorescence, phosphorescence.

scholarly journals Effect of Some Substituents Increasing the Solubility of Zn(II) and Al(III) Phthalocyanines on Their Photophysical Properties

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
A. A. Chernonosov ◽  
E. A. Ermilov ◽  
B. Röder ◽  
L. I. Solovyova ◽  
O. S. Fedorova
Keyword(s):  
Absorption Spectra ◽  
Structural Changes ◽  
Water Solubility ◽  
Transient Absorption ◽  
Photophysical Properties ◽  
Water Soluble ◽  
Quantum Yields ◽  
Carboxyl Groups ◽  
Transient Absorption Spectra ◽  
Photochemical Properties

Water solubility of phthalocyanines (Pcs) usually increases by the introduction of charged or carboxy substituents in the peripheral positions of the macrocycle. As a result, such structural changes influence their photophysical and photochemical properties as photosensitizers. Phthalocyanines substituted with four or eight terminal carboxyl groups and having in some cases additional eight positive charges (water soluble phthalocyanines) were studied in order to evaluate the spectroscopic and photophysical effects of these side residues on the chromophore properties. The quantum yield of singlet oxygen (O12) generation, the triplet-triplet absorption, and the transient absorption spectra were measured and linked to the structure of the substituents. It was shown that charged substituents did not change the quantum yields ofO12generation but decrease its lifetimes. The introduction of the charged substituents not only increases the water solubility but also significantly changes absorption, fluorescence, and transient absorption spectra of water soluble Pcs.

scholarly journals Time-dependent Picosecond Transient Absorption Spectra of 9-Acetylanthracene, Benzophenone and Acridine in Solution

1984 ◽  
Vol 4 (1-6) ◽  
pp. 287-295 ◽  
Author(s):  
Kumao Hamanoue ◽  
Kazuo Nakajima ◽  
Toshiharu Hidaka ◽  
Toshihiro Nakayama ◽  
Hiroshi Teranishi
Keyword(s):  
Absorption Spectra ◽  
Time Scale ◽  
Room Temperature ◽  
Transient Absorption ◽  
Time Dependent ◽  
Spectral Change ◽  
Transient Absorption Spectra ◽  
Picosecond Time Scale ◽  
Spectral Shapes

The transient absorption spectra of the title compounds in solutions at room temperature have been measured on the picosecond time scale. For 9-acetylanthracene and acridine there were measurable changes of the spectral shapes in the first picosecond region, while no spectral change was observed for benzophenone.

Kinetic-Model-Free Analysis of Transient Absorption Spectra Enabled by 2D Correlation Analysis

2021 ◽  
pp. 4148-4153
Author(s):  
Julian Hniopek ◽  
Carolin Müller ◽  
Thomas Bocklitz ◽  
Michael Schmitt ◽  
Benjamin Dietzek ◽  
...  
Keyword(s):  
Kinetic Model ◽  
Correlation Analysis ◽  
Absorption Spectra ◽  
Transient Absorption ◽  
Transient Absorption Spectra ◽  
Model Free ◽  
2D Correlation Analysis

Graphical analysis of transient absorption spectra using the phasor approach

2015 ◽  
Vol 32 (8) ◽  
pp. 1693
Author(s):  
Hong Liu ◽  
Yulei Bai ◽  
Yun Zhang ◽  
Shuangli Ye ◽  
Weichao Xu ◽  
...  
Keyword(s):  
Absorption Spectra ◽  
Transient Absorption ◽  
Graphical Analysis ◽  
Transient Absorption Spectra
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