1,720,966 research outputs found
Synthesis and Characterization of ionic or ionisable octithiophenenes
No full textOligothiophenes (OTs) are materials with a precisely defined chain and conjugation length and they are usually more soluble than polymers and stable in various redox states. OTs are important molecules for applications in electronic devices, such as Field Effect Transistors (FETs), Organic Light-Emitting Diodes (OLEDs), photovoltaic cells, and sensors.2
Derivatisation of PTs with ionic or ionisable groups in the side chains provides internal charge compensation (or self-doping) generated during redox processes,3 as well as imparts water solubility. Thanks to these hydrophilic properties, ionic OTs could be able to interact with different ionic and biological molecules. This characteristic makes them interesting for applications as chemo- and bio-sensors. These applications require water-compatible materials, in the form of conjugated (and sometimes luminescent) polyelectrolytes, able to detect biomolecules through their impact on the conditions, for photoinduced charge or excitation transfer.
Sintesi e Caratterizzazione di Octatiofeni Funzionalizzati con Gruppi Ionici o Ionizzabili
No full textSono riportate la sintesi, tramite accoppiamento ossidativo, e la caratterizzazione di octatiofeni recanti in beta catene alchilsulfaniliche funzionalizzate con gruppi COOH e NH2
New Processable Aminoalkylsulfanyl Polythiophenes
No full textThe synthesis and polymerization of novel alkylsulfanyl substituted thiophenes bearing amino end-groups is reported. The new materials were characterized by NMR, FT-IR, UV-Vis, XRPD and GPC
New Aminoalkylsulfanyl Polythiophenes: Organic and Water Soluble Polymers
No full textThe synthesis and characterization of organic and water soluble aminoalkylsulfanyl polythiophenes are reported
Synthesis of asymmetric beta-alkylsulfanyl bithiophenes as precursors for symmetric octithiophenes
No full textThe synthesis of 4-alkylsulfanyl bithiophenes, based on Stille coupling reaction, is reported
Amminoalchilsulfanil Politiofeni: come modulare la solubilità variando la sostituzione amminica
No full textE' presentata la sintesi di politiofeni recanti, sulle catene alchilsulfaniliche laterali, com sostituenti gruppi NH2, NR2, NR3+ e NRBoc. La solubilità di questi polimeri è modulata dal sostituente
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
One-pot synthesis of symmetric octithiophenes from asymmetric beta-alkylsulfanyl bithiophenes
No full textStarting from 4-(octylsulfanyl)-2,2'-bithiophene, 4-bromo-4'-(octylsulfanyl)-2,2'-bithiophene, 4-iodo-4'-(octylsulfanyl)-2,2'-bithiophene, 4-bromo-4'-[(S)-2-methylbutylsulfanyl]-2,2'-bithiophene, and 4-iodo-4'-[(S)-2-methylbutylsulfanyl]-2,2'-bithiophene, a new series of symmetrically beta-substituted octithiophenes were synthesized by one-pot oxidative coupling with FeCl3. The octithiophenes obtained are soluble in common organic solvents and show different solvatochromic properties depending on the substitution type. In particular, the bromine atom exerts a positive influence on the supramolecular organization: the brominated octithiophenes display high filmability, solvatochromism, and CD induced by aggregation (when the chiral 2-methylbutylsulfanyl group is present), properties usually observed for polythiophenes. Density functional theory (DFT) calculations were carried out an a model bithiophene (4-substituted with a methylsulfanyl group) in order to understand the possible mechanism of the growth, the regiochemistry, and the reason for the polymerization leads to an octithiophene
Aggregation Properties of Aminoalkylsulfanyl Polythiophenes
No full textThe aggregation properties of an aminoalkylsulfanyl polythiophenes cayying a tromethylammonium group were characterized through a combined AFM, DOSY NMR and DLS study
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