Electrochemical Reactions in Non-Aqueous Systems

Mann, Charles K.; Barnes, K. K.; Vijh, Ashok K.

doi:10.1149/1.2408299

Cited by 158 publications

(81 citation statements)

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“…4. This conclusion is supported by thermodynamic data (E°°(anthracene) ¼ 3.21 eV; E ox (anthracene, CH 3 CN) ¼ 1.09 vs SCE [17]; E red (pyridinium ion, DMF) ¼ )1.2 V vs SCE [18]). …”

Section: Titration Experimentsmentioning

confidence: 59%

Synthesis, photophysical characterisation and metal ion binding properties of new ligands containing anthracene chromophores

Bolletta

Garelli²,

Montalti³

et al. 2004

Inorganica Chimica Acta

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Two new fluorescent chemosensors for heavy metal ions have been synthesised and their photophysical properties have been investigated. They present a pyridyl-thioether-based binding site and the anthracene moiety as a chromophore. In the experimental conditions used, no evidence is found for the formation of complexes with Pb 2þ , Zn 2þ , Cd 2þ , and Ag þ ions. On the contrary, in acetonitrile solutions both ligands strongly bind Cu 2þ and Hg 2þ cations according to a 1:1 and a 1:2 (metal:ligand) stoichiometry. In these complexes, the intense luminescence typical of anthracene derivatives is almost completely quenched and this phenomenon can be mainly attributed to an intraligand electron transfer process from the anthracene chromophore to the complexed pyridine. These results are of interest for the development of new chemosensors for the design of efficient electronic tongues for the detection of transition metal ions.

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“…4. This conclusion is supported by thermodynamic data (E°°(anthracene) ¼ 3.21 eV; E ox (anthracene, CH 3 CN) ¼ 1.09 vs SCE [17]; E red (pyridinium ion, DMF) ¼ )1.2 V vs SCE [18]). …”

Section: Titration Experimentsmentioning

confidence: 59%

Synthesis, photophysical characterisation and metal ion binding properties of new ligands containing anthracene chromophores

Bolletta

Garelli²,

Montalti³

et al. 2004

Inorganica Chimica Acta

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“…Except for ferrocene and -carotene, the oxidation potentials of all quenchers in Table 4 are greater than 0.8 eV vs SCE. 42 According to data in Table 1, reductive electron-transfer quenching of 3 Hyp is insignificant in this range. The oxidation potential for -carotene vs SCE in THF is 0.74, 57 and triplet quenching is expected to strongly dominate.…”

Section: Resultsmentioning

confidence: 95%

“…54 For some electron acceptors the reduction potentials are known only in DMF. For carbonyl compounds the reduction potentials in aprotic solvents DMSO and DMF practically coincide, 42 so we used data in DMF in order to estimate the ∆ G°e t values in DMSO without further correction when values in DMSO were unavailabe ( Table 2).…”

Section: Resultsmentioning

confidence: 99%

Quenching of Excited Triplet State Hypericin with Energy Acceptors and Donors and Acceptors of Electrons

and¹,

Jenks²,

and³

et al. 1999

J. Phys. Chem. B

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The quenching of the triplet state of hypericin by acceptors of electronic energy and donors and acceptors of electrons was studied by nanosecond laser photolysis. The energy of triplet hypericin is E T ) 13 350 cm -1 , and for acceptors with E T < 13 300 cm -1 the observed energy transfer rate constant declines with increasing exothermicity. Quenching of triplet hypericin by amines in acetonitrile and electron acceptors in DMSO occurs via electron transfer. Spectroscopic and kinetic properties and the quantum yield of hypericin radical ion formation were established. The rate constant profiles for electron transfer (in both directions) are consistent with an excited-state reaction occurring before electron transfer. The rate constant of the interaction of reduced hypericin with O 2 was estimated to be 3.8 × 10 8 M -1 s -1 in acetonitrile.

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“…39 The cyclic voltammetry curve of the PCFO film coated onto Pt is shown in Figure 3. The potentials were measured against an Ag/AgCl reference electrode and converted to values versus the SCE by adding 0.29 V. 40 The first oxidation and reduction potentials for PCFO were found to be +1.42 V versus Ag/Ag + , which corresponds to +1.71 V versus SCE, and À1.65 V versus Ag/Ag + , which corresponds to À1.36 V versus SCE, respectively. The calculated HOMO and LUMO values were À5.84 and À2.77 eV, respectively, and the HOMO-LUMO bandgap calculated from the electrochemical measurement was 3.07 eV, which is in good agreement with that estimated from the UV/Vis absorption onset data obtained for the dilute solution (E g opt ¼1243.37/l onset ¼1243.37/406¼3.06 eV).…”

Section: Resultsmentioning

confidence: 99%

Synthesis and memory performance of a conjugated polymer with an integrated fluorene, carbazole and oxadiazole backbone

Zeng

Liu

Zhang

et al. 2011

Polym J

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A new soluble conjugated polymer, poly[{9-(4-methoxyphenyl)-9H-carbazole}(9,9-dioctylfluorene)(2,5-diphenyl-1,3,4-oxadiazole)] (PCFO), was synthesized through the Suzuki coupling reaction. The absolute fluorescence quantum yield of PCFO was measured using the integrating sphere of a photoluminescence spectrofluorometer, and changed from 49.1% for a dilute tetrahydrofuran solution to 16.2% for a thin film due to the existence of a strong fluorescence quenching effect in the solid state. The HOMO-LUMO bandgap (3.07 eV) calculated from the electrochemical measurement is nearly identical to the optical bandgap (3.06 eV) estimated from the ultraviolet/visible absorption onset data. This film was attached to aluminum and indium-tin oxide contacts to fabricate a memory device with typical bistable electrical switching, nonvolatile write-once read-many-times memory performance, a turn-on voltage of BÀ2.3 V and an ON/OFF ratio of B10 5 . Degradation of the current density was observed for neither the ON nor OFF states after one hundred million continuous read cycles, which indicates that both states were insensitive to read cycles. Keywords: donor-acceptor system; molecular devices; polymer memory; synthesis INTRODUCTIONPolymer memories are proposed to revolutionize electrical applications by providing extremely inexpensive, lightweight and transparent modules that can be fabricated onto plastic, glass or the top layer of CMOS hybrid integration circuits, 1,2 and have been identified as an emerging memory technology by the International Technology Roadmap for Semiconductors since year 2005. 3 Rather than encoding '0'and '1' as a charge stored in the cell of a silicon device, polymer memory stores data in an entirely different form, such as in a highand low-conductivity response to an applied voltage. 4 The molecular structure of polymers can be tailored by functionalizing them with electron donors (D) and acceptors (A) of different strengths, spacer moieties of different steric effects for the electroactive pendant groups, or nanostructured electroactive materials, to induce different memory behaviors in simple metal/polymer/metal devices. 5,6 Very recently, Liu and Chen 7 highlighted the recent developments in D-A polymers for resistive switching memory device applications including conjugated polymers, functional polyimides, nonconjugated pendent polymers and polymer composites. D/A polymer materials (usually carbazole or

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Electrochemical Reactions in Non-Aqueous Systems

Abstract: not Available.

Cited by 158 publications

References 0 publications

Synthesis, photophysical characterisation and metal ion binding properties of new ligands containing anthracene chromophores

Synthesis, photophysical characterisation and metal ion binding properties of new ligands containing anthracene chromophores

Quenching of Excited Triplet State Hypericin with Energy Acceptors and Donors and Acceptors of Electrons

Synthesis and memory performance of a conjugated polymer with an integrated fluorene, carbazole and oxadiazole backbone

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