Fluorescence Emission Anisotropy Coupled to an Electrochemical System:  Study of Exciton Dynamics in Conjugated Polymers

2007 ◽  
Vol 111 (49) ◽  
pp. 18405-18410 ◽  
Author(s):  
F. Montilla ◽  
L. M. Frutos ◽  
C. R. Mateo ◽  
R. Mallavia
Keyword(s):  
Conjugated Polymers ◽  
Fluorescence Emission ◽  
System Study ◽  
Electrochemical System ◽  
Emission Anisotropy ◽  
Exciton Dynamics

scholarly journals Fluorescence anisotropy imaging of a polydiacetylene photopolymer film

2019 ◽  
Vol 97 (6) ◽  
pp. 422-429
Author(s):  
Hamid Soleimaninejad ◽  
Kenneth P. Ghiggino ◽  
Trevor A. Smith ◽  
Matthew F. Paige
Keyword(s):  
Conjugated Polymers ◽  
Single Molecule ◽  
Fluorescence Anisotropy ◽  
Fluorescence Emission ◽  
Future Studies ◽  
Preparation Conditions ◽  
Uv Illumination ◽  
Emission Transition ◽  
The Individual ◽  
Defocused Imaging

UV-illumination of phase-separated surfactant films prepared from mixtures of photopolymerizable 10,12-pentacosadiynoic acid and perfluorotetradecanoic acid results in the formation of fluorescent polydiacetylene fibers and aggregates. In this work, the orientation of polymer strands that comprise the resulting photopolymer structures has been probed using fluorescence anisotropy imaging in combination with defocused single-molecule fluorescence imaging. Imaging experiments indicate the presence of significant fiber-to-fiber heterogeneity, as well as anisotropy within each fiber (or aggregate), with both of these properties changing as a function of film preparation conditions. This anisotropy can be attributed to various alignments of the constituent polymer strands that comprise the larger fibers and aggregates. Intriguingly, when using defocused imaging, fiber images consisted of a series of discrete “doughnut” fluorescence emission patterns, which exhibited intermittent on–off blinking behavior; both of these properties are characteristic of individual emission transition dipoles (single molecules). Further, all of the individual emission transition dipoles had a uniform orientation with respect to the axis of the fiber, indicating a common orientation of discrete emitters in the larger polymer fiber. The implications of these results for future studies of the electronic properties of conjugated polymers in larger macroscopic systems are noted.

scholarly journals Highly Sensitive Detection of Benzoyl Peroxide Based on Organoboron Fluorescent Conjugated Polymers

Polymers ◽  
2019 ◽  
Vol 11 (10) ◽  
pp. 1655 ◽  
Author(s):  
Mingyuan Yin ◽  
Caiyun Zhang ◽  
Jing Li ◽  
Haijie Li ◽  
Qiliang Deng ◽  
...  
Keyword(s):  
Conjugated Polymers ◽  
Benzoyl Peroxide ◽  
Boronic Acid ◽  
Limit Of Detection ◽  
Fluorescence Emission ◽  
High Sensitivity ◽  
Ammonium Persulfate ◽  
Sensitive Detection ◽  
Polymerization Reaction ◽  
Charge Transfer Complexes

The method capable of rapid and sensitive detection of benzoyl peroxide (BPO) is necessary and receiving increasing attention. In consideration of the vast signal amplification of fluorescent conjugated polymers (FCPs) for high sensitivity detection and the potential applications of boron-containing materials in the emerging sensing fields, the organoboron FCPs, poly (3-aminophenyl boronic acid) (PABA) is directly synthesized via free-radical polymerization reaction by using the commercially available 3-aminophenyl boronic acid (ABA) as the functional monomer and ammonium persulfate as the initiator. PABA is employed as a fluorescence sensor for sensing of trace BPO based on the formation of charge-transfer complexes between PABA and BPO. The fluorescence emission intensity of PABA demonstrates a negative correlation with the concentration of BPO. And a linear range of 8.26 × 10−9 M–8.26 × 10–4 M and a limit of detection of 1.06 × 10–9 M as well as a good recovery (86.25%–111.38%) of BPO in spiked real samples (wheat flour and antimicrobial agent) are obtained. The proposed sensor provides a promising prospective candidate for the rapid detection and surveillance of BPO.

scholarly journals Femtosecond Fluorescence Anisotropy Kinetics as a Signature of Ultrafast Electronic Energy Transfer in Bichromophoric Molecules

2002 ◽  
Vol 216 (5) ◽  
Author(s):  
V. Fidler ◽  
P. Kapusta ◽  
M. Nepras ◽  
J. Schroeder ◽  
I.V. Rubtsov ◽  
...  
Keyword(s):  
Fluorescence Anisotropy ◽  
Energy Gap ◽  
General Structure ◽  
Fluorescence Emission ◽  
Energy Difference ◽  
Electronic Energy ◽  
Fluorescence Anisotropy Decay ◽  
Time Resolved ◽  
Emission Anisotropy ◽  
Electronic Energy Transfer

Ultrafast time resolved fluorescence anisotropy decay measurements were performed to gain insight into the energy gap dependence of donor-acceptor inter-chromophoric coupling within one supra-molecule. Three new compounds, each consisting of two semi-rigidly linked and strongly coupled chromophores, were designed and synthesized for this study. Their general structure is donor-spacer-acceptor, where "donor" is phenylamino, pyrenylamino, or benzanthronylamino moiety, and acceptor is aminobenzanthrone. While being similar structurally, the compounds differ significantly in the excitation energy difference of the two chromophores in a supra-molecule. Experimental data show an ultrafast initial fluorescence emission anisotropy decrease (within less then 1 ps) when the excited state energies of the interacting chromophores are close to each other or equal. No such fast fluorescence anisotropy dynamics is observed for a compound with a large energy gap.

Synthesis and fluorescence study of conjugated polymers based on 2,4,6-triphenylpyridine moieties

2016 ◽  
Vol 40 (7) ◽  
pp. 6281-6288 ◽  
Author(s):  
Qianping Ran ◽  
Jianfeng Ma ◽  
Tao Wang ◽  
Shimin Fan ◽  
Yong Yang ◽  
...  
Keyword(s):  
Conjugated Polymers ◽  
Fluorescence Emission ◽  
Band Gaps ◽  
Quantum Yields ◽  
Fluorescence Study ◽  
Strong Fluorescence ◽  
High Quantum ◽  
Stokes Shifts

Three novel 2,4,6-triphenylpyridine-based conjugated polymers showed strong fluorescence emission with large Stokes' shifts, tunable band gaps and high quantum yields.

scholarly journals Synthesis and Exciton Dynamics of Triplet Sensitized Conjugated Polymers

2015 ◽  
Vol 137 (32) ◽  
pp. 10383-10390 ◽  
Author(s):  
Rolf Andernach ◽  
Hendrik Utzat ◽  
Stoichko D. Dimitrov ◽  
Iain McCulloch ◽  
Martin Heeney ◽  
...  
Keyword(s):  
Conjugated Polymers ◽  
Exciton Dynamics

Fluorescence Anisotropy Decays of 4-Cyano-N,N-dimethylaniline in Propylene Glycol Studied by Frequency-Domain Fluorometry

1998 ◽  
Vol 53 (8) ◽  
pp. 711-716
Author(s):  
A. Kawski ◽  
G. Piszczek ◽  
I. Gryczyńskia ◽  
Z. Gryczyńskia
Keyword(s):  
Ethylene Glycol ◽  
Frequency Domain ◽  
Propylene Glycol ◽  
Fluorescence Anisotropy ◽  
Fluorescence Emission ◽  
Fluorescence Lifetimes ◽  
Emission Anisotropy ◽  
Anisotropy Decays ◽  
Fluorescence Anisotropy Decays ◽  
Frequency Domain Fluorometry

AbstractThe fluorescence lifetimes of 4-cyano-N,N-dimethylaniline (CDMA), measured in propylene glycol at 293 K using frequency-domain fluorometry, in the short emission (SE) and long emission (LE) bands are 20 ps and 1.65 ns, respectively. The higher emission anisotropies in the SE band compared to that in the LE band are due to weaker rotational depolarization of fluorescence. Emission anisotropy decays imply that the initial limiting emission anisotropy, r (0), is the same in the SE and LE bands and amounts to 0.28. This reflects the fact that the directions of transition moments in these bands are parallel. In the case of CDMA in propylene and ethylene glycol at temperatures from 293 to 343 K, viscosity more strongly affects the relaxation to the TICT state than does the change in polarity of the solvents used.

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