Results 61 to 70 of about 12,878 (240)

Structure and photophysics of 2-(2'-pyridyl)benzindoles: The role of intermolecular hydrogen bonds [PDF]

, 2007
The photophysical properties of two isomeric 2-(2′-pyridyl) benzindoles depend on the environment. Strong fluorescence is detected in nonpolar and polar aprotic solvents. In the presence of alcohols, the emission reveals an unusual behavior.
Buma, W.J., Mudadu, M.S., Petkova, I., Singh, A.K., Stokkum, I.H.M. van, Thummel, R.P., Waluk, J.   +6 more
core   +3 more sources

Membrane Polymers for the Pervaporative Separation of Polar Organics: Methanol and Acetonitrile

Journal of Applied Polymer Science, EarlyView.
We tested seven polymers as membranes for the pervaporative separation of methanol‐acetonitrile mixtures. Chloroprene rubber, silicone rubber, and Matrimid showed effective separation by favoring acetonitrile transport, enabling azeotrope breaking. Plasticization was assessed using Broadband Dielectric Spectroscopy.
Jordan Janák, Jan Polena, Tereza Šimsová, Jonatan Šercl, Zdeněk Hrdlička, Tomáš Moucha, Štěpán Hovorka, Michal Fulem, Ondřej Vopička   +8 more
wiley   +1 more source

Aromatic Diester Anolytes for Nonaqueous Redox Flow Batteries

Batteries &Supercaps, EarlyView.
Owing to their extended π‐conjugation 2,2′‐bipyridyl aromatic diesters are stable in singly‐ and doubly‐reduced states. In a redox flow battery a high battery voltage of 2.82 V can be realized and a capacity a capacity retention of 99.5% per cycle for 260 cycles.
Nicolas Daub, Dimitar Georgiev, René A. J. Janssen   +2 more
wiley   +1 more source

Shedding Light on Synthetic Autocatalysis: From Conventional Closed‐Shell Chemistries to Overlooked Open‐Shell Occurrences

Chemistry – A European Journal, EarlyView.
Why add another catalyst when the product itself holds the power to catalyze its own formation? Autocatalysis in synthetic chemistry enhances reaction efficiency and uncovers novel catalytic behavior across both closed‐shell and open‐shell systems, expanding reactivity and enabling innovative design strategies.
Jaspreet Kaur, Joshua P. Barham
wiley   +1 more source

Synthesis, Self-Assembly in Crystalline Phase and Anti-Tumor Activity of 2-(2-/4-Hydroxybenzylidene)thiazolo[3,2-a]pyrimidines

Molecules, 2022
A series of new thiazolo[3,2-a]pyrimidines different by aryl substituents in 2 and 5 positions are synthesized and characterized in solution as well as in the crystalline phase using 1H and 13C NMR-, IR-spectroscopies, mass-spectrometry methods, and ...
Artem S. Agarkov, Anna A. Nefedova, Elina R. Gabitova, Alexander S. Ovsyannikov, Syumbelya K. Amerhanova, Anna P. Lyubina, Alexandra D. Voloshina, Pavel V. Dorovatovskii, Igor A. Litvinov, Svetlana E. Solovieva, Igor S. Antipin   +10 more
doaj   +1 more source

Transitioning Formamide Solvothermal Syntheses of MOFs to Less Toxic Solvents

Chemistry – A European Journal, EarlyView.
Metal‐organic Frameworks (MOFs) are commonly synthesized in toxic formamide solvents. This study investigates the synthetic factors required for effective removal of formamides across various classes of MOFs, providing a foundation for designing new sustainable MOF syntheses.
Julia C. Donovan, Evelyn C. Peterson, Adam J. Matzger   +2 more
wiley   +1 more source

Synthesis of a π‐Extended Phenazine Diimide Derivative and Characterization of Its Closed‐Shell Reduced States

Chemistry – A European Journal, EarlyView.
In this work, the synthesis and characterization of novel π‐extended phenazine diimides is reported. The derivatives undergo differential reduction to a dihydrophenazine or Meisenheimer form depending on the reaction conditions employed. The outcome of this work highlights the paramount importance of structural design in determining the nature of the ...
Francesco Rigodanza, Beatrice Bartolomei, Ilaria Crea, Paolo Costa, Nicola Demitri, Marcella Bonchio, Maurizio Prato, Jacopo Dosso   +7 more
wiley   +1 more source

Identifying the coiled-coil triple helix structure of β-peptide nanofibers at atomic resolution [PDF]

, 2018
Peptide self-assembly represents a powerful bottom-up approach to the fabrication of new nanomaterials. β3-peptides are non-natural peptides composed entirely of β-amino acids, which have an extra methylene in the backbone and we reported the first ...
Aguilar, Marie-Isabel, Al-Garawi, Zahraa S, Christofferson, Andrew J, Del Borgo, Mark Pasqualino, Serpell, Louise C, Todorova, Nevena, Turner, Jack, Yarovsky, Irene   +7 more
core   +2 more sources

Electroanalysis of neutral precursors in protic ionic liquids and synthesis of high-ionicity ionic liquids [PDF]

, 2017
Protic ionic liquids (PILs) are ionic liquids that are formed by transferring protons from Brønsted acids to Brønsted bases. While they nominally consist entirely of ions, PILs can often behave as though they contain a significant amount of neutral ...
Daniel, Smith, Jones, Robert, Joshua, Gibson, Sean, Goodwin, Walsh, Darren A.   +4 more
core   +2 more sources

The Formation of Covalent Linkages in Lignocellulosic Biomass via the Oxocarbenium Intermediate

ChemPhysChem, EarlyView.
Density functional theory models show that the hydrated and acidic hemicellulose matrix in lignocellulosic biomass can generate oxocarbenium ions. These reactive intermediates can participate in the stable formation of glycosidic lignin‐carbohydrate covalent linkages, promoting recalcitrance in plant biomass.
Eduardo Romero‐Montalvo, Samir H. Mushrif   +1 more
wiley   +1 more source