Phosphorescence properties and kinetics of the lowest triplet state T1 of a series of pyrene derivatives as obtained by ODMR techniques

1981 ◽  
Vol 55 (1) ◽  
pp. 137-152 ◽  
Author(s):  
Chr. Bräuchle ◽  
H. Kabza ◽  
J. Voitländer
Keyword(s):  
Triplet State ◽  
Pyrene Derivatives ◽  
Kinetics Of

scholarly journals Oriented arrangement of simple monomers enabled by confinement: towards living supramolecular polymerization

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Yingtong Zong ◽  
Si-Min Xu ◽  
Wenying Shi ◽  
Chao Lu
Keyword(s):  
Activation Barrier ◽  
Degree Of Polymerization ◽  
Supramolecular Polymer ◽  
Energy Principle ◽  
Spontaneous Nucleation ◽  
Pyrene Derivatives ◽  
Multifunctional Molecules ◽  
Double Hydroxide ◽  
Supramolecular Polymerization ◽  
Kinetics Of

AbstractThe living supramolecular polymerization technique provides an exciting research avenue. However, in comparison with the thermodynamic spontaneous nucleation, using simple monomers to realize living supramolecular polymerization is hardly possible from an energy principle. This is because the activation barrier of kinetically trapped simple monomer (nucleation step) is insufficiently high to control the kinetics of subsequent elongation. Here, with the benefit of the confinement from the layered double hydroxide (LDH) nanomaterial, various simple monomers, (such as benzene, naphthalene and pyrene derivatives) successfully form living supramolecular polymer (LSP) with length control and narrow dispersity. The degree of polymerization can reach ~6000. Kinetics studies reveal LDH overcomes a huge energy barrier to inhibit undesired spontaneous nucleation of monomers and disassembly of metastable states. The universality of this strategy will usher exploration into other multifunctional molecules and promote the development of functional LSP.

ODMR and triplet state kinetics of a carbazolyl substituted diacetylene crystal

1978 ◽  
Vol 56 (2) ◽  
pp. 208-213 ◽  
Author(s):  
H. Eichele ◽  
M. Schwoerer ◽  
J.U. von Schütz
Keyword(s):  
Triplet State ◽  
Kinetics Of

The kinetics of phosphorescence and delayed fluorescence decay for aromatic hydrocarbons in liquid paraffin

1964 ◽  
Vol 281 (1386) ◽  
pp. 420-436 ◽  
Keyword(s):  
Triplet State ◽  
Incident Light ◽  
Liquid Paraffin ◽  
Solute Concentration ◽  
Fluorescence Decay ◽  
Delayed Fluorescence ◽  
Linear Functions ◽  
Temperature Ranges ◽  
Kinetics Of ◽  
Viscosity Dependence

The decay constants k T for phosphorescence and k D for delayed fluorescence have been measured for the same outgassed solutions of acenaphthene, pyrene, 1,2-benzanthracene and fluoranthene in liquid paraffin over a range of temperatures between – 70 and 30 °C. In all cases the luminescence decay is exponential and the intensity of delayed fluorescence is found to vary as the second power of incident light intensity; under these conditions the relation k D = 2 k T required by the triplet-triplet annihilation origin of delayed fluorescence is established over the temperature ranges in which delayed fluorescence and phosphorescence are exhibited simultaneously. Diffusional quenching of the triplet state 3 A by a solute impurity Q is believed to be responsible for the temperature (viscosity) dependence of k T and k D since ( a ) k T and k D are linear functions of solute concentration where this is examined, ( b ) by taking account of the reversibility of the quenching process 3 A + Q ⇌ A + 3 Q at higher temperatures (lower viscosities) the virtual independence of k on temperature exhibited for 1,2-benzanthracene and fluoranthene under these conditions may be explained. The resumed temperature dependence of k D for fluoranthrene at still higher temperatures is attributed to endothermic quenching of the triplet state by an impurity with a higher triplet state than that of the solute.

A laser photolysis study of the quenching kinetics of triplet-state all-trans-retinal by oxygen in aqueous albumin and liposome solutions

2010 ◽  
Vol 44 (6) ◽  
pp. 520-523 ◽  
Author(s):  
P. P. Levin ◽  
P. V. Aboltin ◽  
T. F. Shevchenko ◽  
G. R. Kalamkarov
Keyword(s):  
Triplet State ◽  
Laser Photolysis ◽  
Kinetics Of
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