Fluorescence properties of ion pair charge transfer complex with bithiophene group

Ito, Fuyuki; Nagai, Takayasu; Sota, Yasuhiro; Nagamura, Toshihiko

doi:10.1016/j.jphotochem.2010.04.007

Cited by 8 publications

(10 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The reaction is affected by several factors such as amine structure and solvent identity . Recently, we have carried out fundamental studies on the solvent dependence of carbamic acid formation . For example, we have found that undissociated carbamic acid rather than ammonium carbamate is selectively generated in protophilic, dipolar, aprotic solvents such as dimethyl sulfoxide, dimethylformamide, and pyridine .…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Kinetic investigation on carbamate formation from the reaction of carbon dioxide with amino acids in homogeneous aqueous solution

Yamamoto

Hasegawa

Ito

2011

J of Physical Organic Chem

View full text Add to dashboard Cite

The kinetics of carbamate formation from the reaction of carbon dioxide with a-amino acids in D 2 O was first investigated by means of nuclear magnetic resonance spectroscopy. Potassium carbonate was used as the CO 2 source. For each amino acid, the maximum carbamate yield, the apparent rate constant for the carbamate formation k app , and the rate constants for the formation k 1 and the breakdown k À1 of the carbamate were estimated. Plots of log k 1 or log k À1 versus pK a of amino acids indicated that the formation rate k 1 increased with the basicity (pK a ) of amino acid, while the decomposition rate k À1 decreased. A Brfnsted b value of 0.39 was obtained from the former plot, being in good agreement with the previously reported ones (0.26-0.43). The observed negative pK a dependence of log k À1 (Brfnsted a = 0.34) is reasonable, because the carbamate decomposition is acid-catalyzed and the steady-state concentration of H + should be higher for weaker basic amines. The charge (s) and the lone-pair energy (E N ) at the nitrogen atom of the amino group were calculated. Although log k 1 correlated with s and E N , log k À1 was unrelated with both of these parameters. Considering that the carbamate formation (k 1 ) is not only base-catalyzed but should also be promoted by the nucleophilicity of the amino nitrogen, its correlation with s and E N in addition to pK a is rational. The irrelevance of log k À1 to s and E N is not surprising, because s and E N are not a direct measure of [H + ] of the solution.

show abstract

Section: Introductionmentioning

confidence: 99%

“…In organic solvents, amine reacts with carbon dioxide to generate carbamic acid or ammonium carbamate (Eqns and ). The reaction is affected by several factors such as amine structure and solvent identity . Recently, we have carried out fundamental studies on the solvent dependence of carbamic acid formation .…”

Section: Introductionmentioning

confidence: 99%

Kinetic investigation on carbamate formation from the reaction of carbon dioxide with amino acids in homogeneous aqueous solution

Yamamoto

Hasegawa

Ito

2011

J of Physical Organic Chem

View full text Add to dashboard Cite

show abstract

“…The fact, that we observe a fast decay component, that is independent on the sample bias, can be explained by some experimental artefacts like scattering of stray light into the detector. Furthermore, double exponential decays have been also observed earlier, depending strongly on the exact molecular design and the surrounding [23]. However, in the following only relative changes in the lifetime will be considered since they are, according to the model, related to relative changes in the charge carrier density.…”

Section: Resultsmentioning

confidence: 87%

Mapping charge carrier density in organic thin-film transistors by time-resolved photoluminescence lifetime studies

Leißner

Jensen

Liu

et al. 2017

Organic Electronics

View full text Add to dashboard Cite

The device performance of organic transistors is strongly influenced by the charge carrier distribution. A range of factors effect this distribution, including injection barriers at the metal-semiconductor interface, the morphology of the organic film, and charge traps at the dielectric/organic interface or at grain boundaries. In our comprehensive experimental and analytical work we demonstrate a method to characterize the charge carrier density in organic thin-film transistors using time-resolved photoluminescence spectroscopy. We developed a numerical model that describes the electrical and optical responses consistently. We determined the densities of free and trapped holes at the interface between the organic layer and the SiO 2 gate dielectric by comparison to electrical measurements. Furthermore by applying fluorescence lifetime imaging microscopy we determine the local charge carrier distribution between source and drain electrodes of the transistor for different biasing conditions. We observe the expected hole density gradient from source to drain electrode.

show abstract

“…Добавили 70 мл воды, экстрагировали диэтиловым эфиром (3×50 мл), органические вытяжки промыли водой (2×50 мл), высушили над прокален-ным Na 2 SO 4 , после отгонки растворителя и высушивании на масляном насосе выделили 530 мг смеси бромидов 4 и 7. -(2,3-дигидротиено[3,4-b] [1,4]диоксин-5-ил)-6,7,9,10,12,13,20,21,23,24,26,27-додекагидродибензо[b,n] [1,4,7,10,13,16,19,22]октаоксациклотетракозина (8). В колбу, снабженную обратным холодильником, поместили 527 мг смеси бромидов 4 и 7 в 10 мл ДМФА добавили 250 мг (1.7 ммоль) стананна 2.…”

Section: экспериментальная частьunclassified

“…В частности, хорошие характеристики демонстрируют молекулы, содержащие в своем составе фрагменты тиофена и виологена. [8][9][10] В настоящей работе для получения систем, сочетающих фрагменты тиофена и виологена, мы использовали супра-молекулярный метод создания ротаксановых комплексов на основе дибензо-24-краун-8-эфира, содержащего в качестве заместителя 3,4-этилендиокситиофен, и перх-лората N, N'-диметил-4,4'-бипиридиния. Производные тиофена обладают способностью под действием фото-облучения отдавать электрон с образованием достаточно устойчивых катион-радикалов, а виологены являются акцепторами электронов.…”

Section: Introductionunclassified

Pseudorotaxane Structures Based on Thiophene-Containing Dibenzo-24-crown-8 Ether Derivatives

Lukovskaya¹,

Kosmacheva²,

Sotnikova³

et al. 2016

MHC

View full text Add to dashboard Cite

show abstract

Fluorescence properties of ion pair charge transfer complex with bithiophene group

Cited by 8 publications

References 29 publications

Kinetic investigation on carbamate formation from the reaction of carbon dioxide with amino acids in homogeneous aqueous solution

Kinetic investigation on carbamate formation from the reaction of carbon dioxide with amino acids in homogeneous aqueous solution

Mapping charge carrier density in organic thin-film transistors by time-resolved photoluminescence lifetime studies

Pseudorotaxane Structures Based on Thiophene-Containing Dibenzo-24-crown-8 Ether Derivatives

Contact Info

Product

Resources

About