Results 111 to 120 of about 468,724 (277)

β‐Ketonitrile‐Modified Prodan Derivatives as Large‐Stokes‐Shift Solvatochromic Fluorophores With Enhanced Brightness and Ratiometric Thermometric Response

Chemistry – A European Journal, EarlyView.
We report a systematic study of β‐ketonitrile–modified Prodan‐type solvatochromic fluorophores. The β‐ketonitrile substitution induces marked bathochromic shifts in absorption and emission and significantly enhances fluorescence quantum yields in nonpolar solvents.
Hiroaki Asakawa, Takuya Tanaka, Kensei Konishi, Gen‐ichi Konishi   +3 more
wiley   +1 more source

Infrared Irradiation‐Assisted Pd‐Catalyzed C(sp3)─H Arylation and Tandem Cyclization of Ortho‐Tolualdehydes

Chemistry – A European Journal, EarlyView.
A rapid and efficient protocol for the synthesis of 2‐benzylbenzaldehydes and anthracenes is reported, based on the infrared (IR) irradiation‐assisted Pd‐catalyzed C(sp3)─H arylation and the tandem C(sp3)─H arylation/electrophilic aromatic cyclization of ortho‐tolualdehydes with aryl iodides via a transient directing group (TGD) strategy.
Matteo Renato Martina, Ambra Maria Fiore, Angela Punzi, Gianluigi Albano, Roberta Ragni, Pietro Cotugno, Gianluca Maria Farinola   +6 more
wiley   +1 more source

Infrared Emission of Specific Polycyclic Aromatic Hydrocarbon Molecules: Cyanonaphthalenes

The Astrophysical Journal
The unidentified infrared emission features at 3.3, 6.2, 7.7, 8.6, 11.3, and 12.7 μ m are ubiquitously seen in a wide variety of astrophysical regions and commonly attributed to polycyclic aromatic hydrocarbon (PAH) molecules.
Kaijun Li, Aigen Li, X. J. Yang, Taotao Fang   +3 more
doaj   +1 more source

Biochar-mediated polycyclic aromatic hydrocarbon contamination remediation: trends and frontiers

Frontiers in Marine Science
In response to the significant environmental challenge posed by polycyclic aromatic hydrocarbon (PAH) contamination, extensive research efforts have focused on biochar-mediated remediation.
Shuying Geng, Bingxiang Gao, Suzhen Yin, Rupeng Liu, Cuizhen Sun, Linxu Xu, Xue Shen, Yubo Zhao, Feiyong Chen, Jiayi Ruan, Shushuai Mao   +10 more
doaj   +1 more source

Exploring the Boundaries of Aromaticity in Complex Structures and Excited States Through Computational Analysis

Chemistry – A European Journal, EarlyView.
Understanding aromaticity has evolved from benzene‐centric concepts to a broad multidimensional framework spanning organic, inorganic, and excited‐state systems. This review highlights ambiguities between magnetic, electronic, geometric, and energetic descriptors, emphasizing the need for unified, multi‐criteria approaches.
Sílvia Escayola, Miquel Solà, Albert Poater   +2 more
wiley   +1 more source

Removal of hydrocarbons from crude oil contaminated agricultural soil by phytoremediation using Mariscus alternifolius and Fimbristylis ferruginea

European Journal of Biological Research, 2019
Crude oil extraction is one major route through which hydrocarbons are released into the environment and hydrocarbon contamination is highly hazardous to the ecosystem.
Chukwuemeka C. Chukwuma, Jude Chigozie Ikewuchi, M. O. Monanu   +2 more
doaj  

Avaliação da biodegradação de pireno pela microbiota nativa em sedimento do manguezal do Itacorubi, Florianópolis,SC [PDF]

, 2006
Dissertação (mestrado) - Universidade Federal de Santa Catarina, Centro de Ciências Físicas e Matemáticas. Programa de Pós-graduação em QuímicaA localização dos manguezais é estrategicamente propícia à contaminação podendo, portanto, receber poluentes ...
Oliveira, Cristiane Rossi de
core  

Proximal Steric Shielding Unlocks High Solid‐State Luminescence in Quinoxaline‐Fused Pyrene Heteroacenes

Chemistry – A European Journal, EarlyView.
Proximal steric tuning of quinoxaline‐fused pyrene heteroacenes enables soluble derivatives that exhibit solid‐state photoluminescence quantum yields (PLQYs) up to 82%, surpassing previous benchmarks. This work reveals key structure–property relationships for next‐generation, processable organic emitters in advanced optoelectronic applications ...
Rafiq Ahamed, Sonal Patil, Madhusudan Dutta, Godi Kiran Venkata Sai, Sergey Fisher, Anil Bhadke, Rama Krishna Gamidi, Susnata Pramanik, Tomáš Šolomek, Sudhakar Gaikwad   +9 more
wiley   +1 more source

Illuminating Olympicenes: Insights Into Anti‐Kasha Photophysics in Polycyclic Aromatic Hydrocarbons

Chemistry – A European Journal, EarlyView.
Compact olympicene‐based chromophores reveal unexpectedly rich excited‐state behavior, including dual fluorescence, excitation‐dependent emission, and anti‐Kasha‐type emission. Tunable locally excited and intramolecular charge‐transfer states emerge from subtle structural changes, expanding the design rules for polycyclic aromatic chromophores and ...
Wenlong Li, Stephen Awuku, Mia E. Dionne, Jordyn L. Gunderson, Marc R. MacKinnon, Amy L. Stevens   +5 more
wiley   +1 more source

Regioisomerism Rewires Optical and Ion Recognition Properties in Azulenylsumanenes—Curved Non‐Alternant π‐Systems

Chemistry – A European Journal, EarlyView.
Regioisomerism rewires orbital topology and electronic polarity in curved non‐alternant π‐systems, switching both optical response and alkali metal ion recognition from Na+ to Rb+ selectivity. ABSTRACT Herein, we explore the fundamental concept of combining the molecular curvature of a molecular fragment of buckminsterfullerene with the pronounced ...
Jakub Cyniak, Anna Mazur, Bartłomiej Pigulski, Hidehiro Sakurai, Artur Kasprzak   +4 more
wiley   +1 more source