Results 21 to 30 of about 10,562 (252)

Petrosamine Revisited. Experimental and Computational Investigation of Solvatochromism, Tautomerism and Free Energy Landscapes of a Pyridoacridinium Quaternary Salt

open access: yesMarine Drugs, 2023
Petrosamine (1)—a colored pyridoacridine alkaloid from the Belizean sponge, Petrosia sp., that is also a potent inhibitor of acetylcholine esterase (AChE)—was investigated by spectroscopic and computational methods.
Christopher J. Gartshore   +3 more
doaj   +1 more source

Spiropyran-Based Drug Delivery Systems

open access: yesFrontiers in Chemistry, 2021
Nanocarriers are rapidly growing in popularity in the field of drug delivery. The ability of nanocarriers to encapsulate and distribute poorly soluble drugs while minimising their undesired effects is significantly advantageous over traditional drug ...
Andrew Fagan   +2 more
doaj   +1 more source

Prediction of Solvatochromic Polarity Parameters for Aqueous Mixed-Solvent Systems

open access: yesApplied Sciences, 2020
Solvent polarity is important data being used in solvent selections for preliminary engineering design of chemical processes. In this work, a predictive model is proposed for estimating the solvatochromic polarity of electronic transition energy (ET) of ...
Alif Duereh   +2 more
doaj   +1 more source

Dramatic morphological changes in liposomes induced by peptide nanofibers reversibly polymerized and depolymerized by the photoisomerization of spiropyran

open access: yesFrontiers in Molecular Biosciences, 2023
Cytoskeletons such as microtubules and actin filaments are natural protein assemblies, which dynamically control cellular morphology by reversible polymerization/depolymerization.
Yingbing Liang   +5 more
doaj   +1 more source

2-(2-(Dimethylamino)vinyl)-4H-pyran-4-ones as Novel and Convenient Building-Blocks for the Synthesis of Conjugated 4-Pyrone Derivatives

open access: yesMolecules, 2022
A straightforward approach for the construction of the new class of conjugated pyrans based on enamination of 2-methyl-4-pyrones with DMF-DMA was developed.
Dmitrii L. Obydennov   +8 more
doaj   +1 more source

Synthesis, Photochromic and Luminescent Properties of Ammonium Salts of Spiropyrans

open access: yesMolecules, 2022
New salts of photochromic indoline spiropyrans capable of reversibly responding to UV radiation were synthesized to develop light-controlled materials.
Artur A. Khuzin   +3 more
doaj   +1 more source

A multiswitchable poly(terthiophene) bearing a spiropyran functionality: understanding photo and electrochemical control [PDF]

open access: yes, 2011
An electroactive nitrospiropyran-substituted polyterthiophene, 2-(3,3′′-dimethylindoline-6′-nitrobenzospiropyranyl)ethyl 4,4′′-didecyloxy-2,2′:5′,2′′-terthiophene-3′-acetate, has been synthesized for the first time.
Breukers, Robert   +10 more
core   +1 more source

Synthesis and Characterization of Azospiropyran Photochromic Dyes Based Para Nitro Aniline [PDF]

open access: yesشیمی کاربردی روز, 2015
nitro-derived of azospiroptran has been synthesized by the reaction of  Fischer's base with 5-((4-nitrophenyl)diazenyl) 2-hydroxy  benzaldehyde. 5-((4-nitrophenyl)diazenyl) 2-hydroxy  benzaldehyde was obtained from the diazocoupling reaction of para ...
مریم حیدری پور   +2 more
doaj   +1 more source

Photoannealing of Merocyanine Aggregates

open access: yesThe Journal of Physical Chemistry A, 2018
In this work we elucidate the fundamental difference between aggregate formation of donor-π-acceptor merocyanines in their electronic ground and excited states. While increasing the π-bridge size favors formation of π-stacked aggregates in the dark, irradiation with visible light causes reorientation of the dyes to form prototype H-aggregates with ...
Felix Herrmann-Westendorf   +8 more
openaire   +3 more sources

Synthesis of Merocyanine Dyes [PDF]

open access: yesBulletin of the Chemical Society of Japan, 1978
Abstract New 1-ethyl-2-[(2-substituted 3-oxoisoindolin-1-ylidene)methyl]-pyridinium or quinolinium iodide merocyanine dyes were obtained by the reaction of 2-methyl quaternary salts with N-substituted phthalimide in the presence of piperidine.
Abdu E Abdel-Rahman, Zarif H Khalil
openaire   +1 more source

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