Synthesis and fluorescence properties of dioxa-, dithia-, and diselena-[3.3](1,3)pyrenophanes

2017 ◽  
Vol 16 (2) ◽  
pp. 228-237 ◽  
Author(s):  
Hajime Maeda ◽  
Masato Hironishi ◽  
Rikiya Ishibashi ◽  
Kazuhiko Mizuno ◽  
Masahito Segi
Keyword(s):  
Fluorescence Spectra ◽  
Solvent Polarity ◽  
Fluorescence Properties ◽  
Excimer Emission ◽  
Intramolecular Excimer

The fluorescence spectra of [3.3](1,3)pyrenophanes in solution contain both monomer and intramolecular excimer emission bands. The ratio of the intensities is controlled by solvent polarity and temperature.

Spectra of dimers of anthracene and its derivatives. I. Sandwich dimers

1973 ◽  
Vol 26 (1) ◽  
pp. 91 ◽  
Author(s):  
J Ferguson ◽  
AWH Mau ◽  
JM Morris
Keyword(s):  
Absorption Spectra ◽  
Glass Matrix ◽  
Fluorescence Spectra ◽  
The Other ◽  
Fluorescence Properties ◽  
Fluorescence Lifetimes ◽  
Excimer Emission ◽  
Photochemical Cleavage ◽  
Broad Structure ◽  
Related Compounds

Sandwich dimers are obtained by photochemical cleavage of dianthracene and related compounds in a rigid glass matrix at 77 K. Detailed studies of the absorption spectra, fluorescence spectra, and fluorescence lifetimes of symmetric dimers of anthracene and 9-substituted anthracenes (both molecules the same) and dissimilar dimers (one molecule anthracene, the other 9- or 9,10-substituted anthracene) have been made. Particular attention has been paid to these properties during dissociation of the dimers as the glass is allowed to soften. The fluorescence properties show a discontinuity during this dissociation. The excimer emission maxima (lifetimes about 200 ns) move a little to higher energy (lifetimes decrease to about 100 ns) then broad structure is observed in the spectra and lifetimes drop to about 5 ns. The fluorescence spectra of the dissimilar dimers are of the excimer type with lifetimes of about 100 ns. These values do not appear to be compatible with existing theories of the excimer state.

Pyrene-tiaraed pillar[5]arene: Strong intramolecular excimer emission applicable for photo-writing

2020 ◽  
Author(s):  
Chao Peng ◽  
Wenting Liang ◽  
Jiecheng Ji ◽  
Chunying Fan ◽  
Kuppusamy Kanagaraj ◽  
...  
Keyword(s):  
Excimer Emission ◽  
Intramolecular Excimer

Synthesis, postmodification and fluorescence properties of reduction-cleavable core-couplable miktoarm stars with a branched core

2015 ◽  
Vol 6 (9) ◽  
pp. 1474-1486 ◽  
Author(s):  
Cangxia Li ◽  
Huanhuan Liu ◽  
Dandan Tang ◽  
Youliang Zhao
Keyword(s):  
Solvent Polarity ◽  
Fluorescence Properties

Postmodification of (PEG)m(PCL)n miktoarm stars with a dual-reactive branched core allowed the introduction of versatile functionalities, and the coumarin-functionalized star exhibited tunable fluorescence properties sensitive to solvent polarity and reduction stimulus.

Synthesis, characterization and fluorescence properties study of meso-tetrakis(1-arylpyrazole-4-yl)porphyrins

2005 ◽  
Vol 09 (06) ◽  
pp. 430-435 ◽  
Author(s):  
Can-Cheng Guo ◽  
Tie-Gang Ren ◽  
Jian Wang ◽  
Chun-Yan Li ◽  
Jian-Xin Song
Keyword(s):  
Elemental Analysis ◽  
Mass Spectra ◽  
Fluorescence Spectra ◽  
Fluorescence Emission ◽  
Red Shift ◽  
Fluorescence Properties ◽  
Quantum Yields ◽  
Fluorescence Quantum Yields ◽  
H Nmr ◽  
Reaction Condition

Five new meso-tetrakis(1-arylpyrazol-4-yl)porphyrins were synthesized to investigate their fluorescence properties. Preparation of these porphyrins was carried out by cyclization of tetramethoxypropane with substituted phenylhydrazine, followed by formylation to give the corresponding aldehydes, which reacted with pyrrole under the Adler reaction condition to get the target porphyrins (1a-1e). All the porphyrins were characterized by 1 H NMR, elemental analysis, UV-vis spectra and mass spectra. Red fluorescence emission of these porphyrins was observed in fluorescence spectra. Compared with meso-tetraphenylporphyrin (TPPH2), these meso-tetrakis(1-arylpyrazol-4-yl) porphyrins had a significant red shift in UV-vis and fluorescence spectra with increased fluorescence quantum yields.

scholarly journals Polycyclic Aromatic Hydrocarbon Solute Probes: Effect of Solvent Polarity on the Ovalene and Benzo[ghi]perylene Fluorescence Emission Fine Structures

1988 ◽  
Vol 42 (8) ◽  
pp. 1525-1531 ◽  
Author(s):  
Riaz Waris ◽  
Michael A. Rembert ◽  
David M. Sellers ◽  
William E. Acree ◽  
Kenneth W. Street ◽  
...  
Keyword(s):  
Polycyclic Aromatic Hydrocarbon ◽  
Aromatic Hydrocarbon ◽  
Fluorescence Emission ◽  
Solvent Polarity ◽  
Fluorescence Properties ◽  
Effect Of Solvent ◽  
Fluorescence Measurements ◽  
Polycyclic Aromatic ◽  
Fine Structures ◽  
Made In

Fluorescence properties of benzo[ghi]perylene (BPe) and ovalene (Ov) dissolved in 25 solvents of varying polarity are reported. Measurements indicate that emission intensities depend on solvent polarity. The BPe and Ov solvent polarity scales are defined as the ratio of the fluorescence emission intensities of bands I and III of the vibronic spectra. Benzo[ghi]perylene and ovalene solute probes enable fluorescence measurements to be made in spectral regions less prone to solvent inner filtering and other artifacts which have hampered the use of pyrene (Py) as a polarity probe molecule.

scholarly journals The Lysosomotropic Agent Monodansylcadaverine Also Acts as a Solvent Polarity Probe

2000 ◽  
Vol 48 (2) ◽  
pp. 251-258 ◽  
Author(s):  
Axel Niemann ◽  
Akira Takatsuki ◽  
Hans-Peter Elsässer
Keyword(s):  
Membrane Lipids ◽  
Effective Interaction ◽  
Stokes Shift ◽  
Solvent Polarity ◽  
Autophagic Vacuole ◽  
Ion Trapping ◽  
Fluorescence Properties ◽  
Autophagic Vacuoles ◽  
Acidic Compartments

The autofluorescent substance monodansylcadaverine has recently been reported as a specific in vivo marker for autophagic vacuoles. However, the mechanism for this specific labeling remained unclear. Our results reveal that the common model of ion trapping in acidic compartments cannot completely account for the observed autophagic vacuole staining. Because autophagic vacuoles are characterized by myelin-like membrane inclusions, we tested whether this lipid-rich environment is responsible for the staining properties of monodansylcadaverine. In in vitro experiments using either liposomes or solvents of different polarity, monodansylcadaverine showed an increased relative fluorescence intensity in a hydrophobic environment as well as a Stokes shift dependent on the solvent polarity. To test the effect of autophagic vacuoles or autophagic vacuole lipids on monodansylcadaverine fluorescence, we isolated autophagic vacuoles and purified autophagic vacuole lipids depleted of proteins. Entire autophagic vacuoles and autophagic vacuole lipids had the same effect on monodansylcadaverine fluorescence properties, suggesting lipids as the responsible component. Our results suggest that the in vivo fluorescence properties of monodansylcadaverine do not depend exclusively on accumulation in acidic compartments by ion trapping but also on an effective interaction of this molecule with autophagic vacuole membrane lipids.

Synthesis and fluorescence of pyrazolines substituted with pyrimidine and ferrocene subunits

2016 ◽  
Vol 22 (1) ◽  
pp. 31-35
Author(s):  
Manman Liu ◽  
Jian Zhang
Keyword(s):  
Organic Solvents ◽  
Elemental Analysis ◽  
Fluorescence Spectra ◽  
Solvent Polarity ◽  
Emission Wavelength ◽  
H Nmr ◽  
C Nmr

Abstract1,3,5-Trisubstituted 2-pyrazolines were synthesized by the reaction of chalcones with hydrazine in hot ethanol. Their structures were elucidated by 1H NMR, 13C NMR, IR, MS and elemental analysis. The fluorescence spectra were measured in different organic solvents. The emission wavelength is blue shifted with the increase in solvent polarity.

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