Results 11 to 20 of about 5,238 (190)

Asymmetric Donor–Acceptor 2,7-Disubstituted Fluorenes and Their 9-Diazoderivatives: Synthesis, Optical Spectra and Photolysis [PDF]

open access: yesMolecules
In a search for dyes photoactivatable with visible light, fluorenes with substituents at positions 2 and 7 were prepared, and their absorption and emission spectra were studied.
Andrei I. Savchenko   +3 more
doaj   +2 more sources

Design and Synthesis of Cofacially-Arrayed Polyfluorene Wires for Electron and Energy Transfer Studies [PDF]

open access: yesMolecules, 2023
A study of cofacially arrayed π-systems is of particular importance for the design of functional materials for efficient long-range intra-chain charge transfer through the bulk semiconducting materials in the layers of photovoltaic devices. The effect of
Rajendra Rathore, Sameh H. Abdelwahed
doaj   +2 more sources

New Azacycles by One‐Pot Three‐Component Hantzsch‐Like Synthesis of Tetra(hexa)azacyclopenta[a]anthracenes, Tetraazaindeno[5,4‐b]fluorenes, and Oxatetraazacyclopenta[m]tetraphenes [PDF]

open access: yesChemistryOpen, 2023
New Azacycles by One‐Pot Three‐Component Hantzsch‐Like Synthesis of Tetra(hexa)azacyclopenta[a]anthracenes, Tetraazaindeno[5,4‐b]fluorenes, and Oxatetraazacyclopenta[m]tetraphenes (H. Butenschön, I. A.
Dr. Amr M. Abdelmoniem   +4 more
doaj   +2 more sources

Polycyclic aromatic hydrocarbon (PAH) source identification and a maternal transfer case study in threatened killer whales (Orcinus orca) of British Columbia, Canada [PDF]

open access: yesScientific Reports, 2023
The northeastern Pacific (NEP) Ocean spans the coast of British Columbia (Canada) and is impacted by anthropogenic activities including oil pipeline developments, maritime fossil fuel tanker traffic, industrial chemical effluents, agricultural and urban ...
Kiah Lee   +6 more
doaj   +2 more sources

Differential degradation of petroleum hydrocarbons by Shewanella putrefaciens under aerobic and anaerobic conditions [PDF]

open access: yesFrontiers in Microbiology
The complexity of crude oil composition, combined with the fluctuating oxygen level in contaminated environments, poses challenges for the bioremediation of oil pollutants, because of compound-specific microbial degradation of petroleum hydrocarbons ...
Yang Li   +6 more
doaj   +2 more sources

Occurrence and geochemical significance of fluorene and alkylfluorenes in crude oils and source rock extracts from Niger Delta basin, Nigeria

open access: yesHeliyon, 2021
The crude oils and their source rocks from Niger Delta basin, Nigeria were investigated by optical microscopy for the maceral compositions and by gas chromatography - mass spectrometry (GC-MS) for the composition, distribution and abundances of saturated
Abiodun B. Ogbesejana   +2 more
doaj   +1 more source

Source rock geochemistry of central and northwestern Niger Delta: Inference from aromatic hydrocarbons content

open access: yesEnergy Geoscience, 2023
The influence of origin, depositional environment and thermal maturity of organic matter on the occurrence of aromatic hydrocarbons in source rocks from the central and northwestern Niger Delta was investigated.
Akinsehinwa Akinlua   +3 more
doaj   +1 more source

Clickable azide-functionalized bromoarylaldehydes – synthesis and photophysical characterization

open access: yesBeilstein Journal of Organic Chemistry, 2020
Herein, we present a facile synthesis of three azide-functionalized fluorophores and their covalent attachment as triazoles in Huisgen-type cycloadditions with model alkynes.
Dominik Göbel   +3 more
doaj   +1 more source

Compounds Derived from 9,9‐Dialkylfluorenes: Syntheses, Crystal Structures and Initial Binding Studies (Part II)

open access: yesChemistryOpen, 2023
New representatives of 2,4,7‐trisubstituted 9,9‐dialkyl‐9H‐fluorenes were prepared and used for crystallographic investigations as well as initial binding studies towards metal ions and carbohydrates.
Dr. Pierre Seidel   +2 more
doaj   +1 more source

Exploring Indeno[2,1-c]fluorene Antiaromatics with Unsymmetrical Disubstitution and Balanced Ambipolar Charge-Transport Properties

open access: yesOrganic Materials, 2023
Unsymmetrically disubstituted antiaromatic indenofluorene (IF), in comparison to aromatic pentacene counterpart with unsymmetrical disubstitution, was rare in the literature until our recent report on indeno[1,2-b]fluorene and indeno[2,1-a]fluorene ...
Himanshu Sharma   +4 more
doaj   +1 more source

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