Explaining the Cyclic Voltammetry of a Poly(1,4-phenylene-ethynylene)-alt-poly(1,4-phenylene-vinylene) Copolymer upon Oxidation by using Spectroscopic Techniques

ChemPhysChem ◽  
2016 ◽  
Vol 18 (1) ◽  
pp. 93-100 ◽  
Author(s):  
Christina Enengl ◽  
Sandra Enengl ◽  
Nassima Bouguerra ◽  
Marek Havlicek ◽  
Helmut Neugebauer ◽  
...  
Keyword(s):  
Cyclic Voltammetry ◽  
Phenylene Vinylene ◽  
Spectroscopic Techniques ◽  
Phenylene Ethynylene

scholarly journals Exploration of Electrochemical Intermediates of the Anticancer Drug Doxorubicin Hydrochloride Using Cyclic Voltammetry and Simulation Studies with an Evaluation for Its Interaction with DNA

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Partha Sarathi Guin ◽  
Saurabh Das
Keyword(s):  
Cyclic Voltammetry ◽  
Anticancer Drug ◽  
Dna Interaction ◽  
Calf Thymus Dna ◽  
Potential Range ◽  
Spectroscopic Techniques ◽  
Doxorubicin Hydrochloride ◽  
Cathodic Peak ◽  
Peak Current ◽  
Calf Thymus

Electrochemical behavior of the anticancer drug doxorubicin hydrochloride was studied using cyclic voltammetry in aqueous medium using Hepes buffer (pH~7.4). At this pH, doxorubicin hydrochloride undergoes a reversible two-electron reduction withE1/2value −665±5 mV (versus Ag/AgCl, saturated KCl). Depending on scan rates, processes were either quasireversible (at low scan rates) or near perfect reversible (at high scan rates). This difference in behavior of doxorubicin hydrochloride with scan rate studied over the same potential range speaks of differences in electron transfer processes in doxorubicin hydrochloride. Attempt was made to identify and understand the species involved using simulation. The information obtained was used to study the interaction of doxorubicin hydrochloride with calf thymus DNA. Cathodic peak current gradually decreased as more calf thymus DNA was added. The decrease in cathodic peak current was used to estimate the interaction of the drug with calf thymus DNA. Nonlinear curve fit analysis was applied to evaluate the intrinsic binding constant and site size of interaction that was compared with previous results on doxorubicin hydrochloride-DNA interaction monitored by cyclic voltammetry or spectroscopic techniques.

Effect of Varying Thiophene Units on Charge-Transport and Photovoltaic Properties of Poly(phenylene ethynylene)-alt-poly(phenylene vinylene) Polymers

2014 ◽  
Vol 215 (15) ◽  
pp. 1473-1484 ◽  
Author(s):  
Getachew Adam ◽  
Teketel Yohannes ◽  
Matthew White ◽  
Alberto Montaigne ◽  
Christoph Ulbricht ◽  
...  
Keyword(s):  
Charge Transport ◽  
Phenylene Vinylene ◽  
Phenylene Ethynylene ◽  
Photovoltaic Properties

Mixed Alkyl- and Alkoxy-Substituted Poly[(phenylene ethynylene)-alt-(phenylene vinylene)] Hybrid Polymers: Synthesis and Photophysical Properties

2004 ◽  
Vol 205 (15) ◽  
pp. 2105-2115 ◽  
Author(s):  
Daniel Ayuk Mbi Egbe ◽  
Stephan Sell ◽  
Christoph Ulbricht ◽  
Eckhard Birckner ◽  
Ulrich-Walter Grummt
Keyword(s):  
Photophysical Properties ◽  
Phenylene Vinylene ◽  
Phenylene Ethynylene ◽  
Hybrid Polymers

Deep-cavity subporphyrazines with extended π-perimeters

2016 ◽  
Vol 20 (08n11) ◽  
pp. 1277-1283 ◽  
Author(s):  
Roman Münnich ◽  
Patricia Löser ◽  
Andreas Winzenburg ◽  
Rüdiger Faust
Keyword(s):  
Cyclic Voltammetry ◽  
Singlet Oxygen ◽  
The Other ◽  
Quantum Yields ◽  
Spectroscopic Techniques ◽  
Fluorine Substitution ◽  
Deep Cavity ◽  
Other Hand ◽  
Specific Induction

Unprecedentedly large subporphyrazines (SubPz) with dibenzoquinoxalino-fusion and peripheral phenyl substitution were prepared by the cyclization of perfluorated or non-fluorous polyphenyl-substituted quinoxaline dinitriles and characterized by spectroscopic techniques. The compounds suitability to act as photosensitizers was explored by wavelength-specific induction of singlet oxygen luminescence and was shown to be excellent. Determination of 1O2-quantum yields suggests that fluorine substitution enhances the photosensitization efficiencies of the SubPz. On the other hand, cyclic voltammetry reveals an increase of irreversible reductive processes in case of the fluorinated SubPz.

Frequency Resolved Photoluminescence (PL), Delayed Fluorescence and Triplet-Triplet Annihilation In 7Φ-Conjugated Polymers

1999 ◽  
Vol 561 ◽  
Author(s):  
J. Partee ◽  
E. L. Frankevich ◽  
B. Uhlhom ◽  
J. Shinar ◽  
Y. Ding ◽  
...  
Keyword(s):  
Conjugated Polymers ◽  
Strong Evidence ◽  
Delayed Fluorescence ◽  
Phenylene Vinylene ◽  
Total Emission ◽  
Phenylene Ethynylene ◽  
Frozen Solutions ◽  
Triplet Triplet Annihilation

ABSTRACTThe delayed fluorescence of poly(p-phenylene vinylene) (PPV) and poly(p-phenylene ethynylene) (PPE) derivative solids and frozen solutions at 20 K is described. It provides strong evidence for triplet-triplet annihilation to singlets excitons accounting for up to ∼3% of the total emission in PPV films and ∼1.5% in PPE powder. It also yields triplet lifetimes of 70 and 110 μs in PPV films and frozen solutions, and ∼200 and ∼500 μs in PPE powder and frozen solutions, respectively.

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