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Time resolved excitation dynamics in emeraldine base

04-Jan-2015 | Author(s): Miroslav Menšík , David Rais , Jiří Pfleger, Chemical Physics, 2015

Publication date: Available online 31 December 2014 Source:Chemical Physics Author(s): Miroslav Menšík , David Rais , Jiří Pfleger Using femtosecond pump-probe transient absorption spectroscopy (wavelengths 330 – 800 nm), we observed and explained excited state, charge transfer and ...

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Unraveling the Intrinsic Color of Chlorophyll

30-Dec-2014 | Bruce F. Milne, Yoni Toker, Angel Rubio, Steen Brøndsted Nielsen, Angewandte Chemie International Edition, 2014

Abstract The exact color of light absorbed by chlorophyll (Chl) pigments, the light‐harvesters in photosynthesis, is tuned by the protein microenvironment, but without knowledge of the intrinsic color of Chl it remains unclear how large this effect is. Experimental first absorption energies of ...

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Ultrafast Hydrolysis of a Lewis Photoacid

29-Dec-2014 | Joseph D. Henrich; Scott Suchyta; Bern Kohler, Journal of Physical Chemistry B, 2014

This study explores the concept that electronic excitation can dramatically enhance Lewis acidity. Specifically, it is shown that photoexcitation transforms an electron-deficient organic compound of negligible Lewis acidity in its electronic ground state into a potent excited-state Lewis acid ...

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New complex bismuth oxides in the Bi2O3–NiO–Sb2O5 system and their properties

28-Dec-2014 | Author(s): A.V. Egorysheva , O.G. Ellert , Y.V. Zubavichus , O.M. Gajtko , N.N. Efimov , R.D. Svetogorov , V.Y ..., Journal of Solid State Chemistry, 2014

Publication date: May 2015 Source:Journal of Solid State Chemistry, Volume 225 Author(s): A.V. Egorysheva , O.G. Ellert , Y.V. Zubavichus , O.M. Gajtko , N.N. Efimov , R.D. Svetogorov , V.Yu. Murzin Phase equilibria in the Bi2O3–NiO–Sb2O5 system have been investigated. The isothermal ...

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NMR, DFT and luminescence studies of the complexation of V(V) oxoions in solution with 8-hydroxyquinoline-5-sulfonate

25-Dec-2014 | M. Luísa Ramos; Licínia L. G. Justino; Sofia M. Fonseca; Hugh D. Burrows, New Journal of Chemistry, 2014

1H, 13C and 51V NMR spectra, DFT calculations, and UV/visible absorption and luminescence spectra are used to study complexation of 8-hydroxyquinoline-5-sulfonate (8-HQS) with vanadium(v). A full speciation study over the concentration region studied shows that V(v) oxoions form three complexes ...

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Increased short circuit current in an azafullerene-based organic solar cell

24-Dec-2014 | Werther Cambarau; Urs F. Fritze; Aurélien Viterisi; Emilio Palomares; Max von Delius, Chemical Communication, 2014

We report the synthesis of a solution-processable, dodecyloxyphenyl-substituted azafullerene monoadduct (DPC59N) and its application as electron acceptor in bulk heterojunction organic solar cells (BHJ-OSCs). Due to its relatively strong absorption of visible light, DPC59N outperforms PC60BM in ...

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Amine‐Functionalized Porous Polymer Network for Highly Selective Absorption of CO2 Over N2

22-Dec-2014 | Doyun Lee, Chengyi Zhang, Haifeng Gao, Macromolecular Chemistry and Physics, 2014

Porous polymeric sorbents showing selective CO2 absorption over N2 are prepared by conventional radical copolymerization of divinylbenzene and 4‐vinylbenzyl chloride under solvothermal conditions, followed by surface modification of the pores with polyamines. The amine‐functionalized porous ...

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Impact of Polymer Conformation on the Crystal Growth Inhibition of a Poorly Water-Soluble Drug in Aqueous Solution

22-Dec-2014 | Caitlin J. Schram; Stephen P. Beaudoin; Lynne S. Taylor, Langmuir, 2014

Poor aqueous solubility is a major hindrance to oral delivery of many emerging drugs. Supersaturated drug solutions can improve passive absorption across the gastrointestinal tract membrane as long as crystallization can be inhibited, enhancing the delivery of such poorly soluble therapeutics. ...

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Solvatochromism and Conformational Changes in Fully Dissolved Poly(3-alkylthiophene)s

22-Dec-2014 | Gregory M. Newbloom; Stephanie M. Hoffmann; Aaron F. West; Melissa C. Gile; Prakash Sista; Hoi-Ki C. Cheung; Christi ..., Langmuir, 2014

Absorption spectroscopy is commonly utilized to probe optical properties that can be related, among other things, to the conformation of single, isolated conjugated polymer chains in solution. It is frequently suggested that changes in peak positions of optical spectra result from variations in ...

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Solution-Processable Singlet Fission Photovoltaic Devices

22-Dec-2014 | Le Yang; Maxim Tabachnyk; Sam L. Bayliss; Marcus L. Böhm; Katharina Broch; Neil C. Greenham; Richard H. Friend; Brun ..., Nano Letters, 2014

We demonstrate the successful incorporation of a solution-processable singlet fission material, 6,13-bis(triisopropylsilylethynyl)pentacene (TIPS-pentacene), into photovoltaic devices. TIPS-pentacene rapidly converts high-energy singlet excitons into pairs of triplet excitons via singlet fission, ...

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