Quantum Efficiency of Photogeneration in Discotic Liquid Crystals: Part 1: Temperature and Wavelength Dependence

Scott, K.; Donovan, Kevin J.; Kreouzis, Theo; Bunning, J. C.; Bushby, Richard J.; Boden, N.; Lozman, Owen R.

doi:10.1080/714965610

Cited by 11 publications

(5 citation statements)

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“…Kato and co‐workers106 succeeded in the enhancement of the hole mobility of triphenylene 35 d (Scheme ) by a factor of three by gelation with hydrogen‐bonded fibers made of peptide derivatives 107. Compound 35 d and a mixture of 35 d and triphenylene 44 c were investigated with respect to quantum efficiency of the photogeneration of charge carriers 108. From the DC photocurrent, Bushby, Boden, and co‐workers deduced the generation efficiency of the photocarriers based on the relation between the current and quantum efficiency, and on the probability that recombination does not occur.…”

Section: Classes Of Compounds Used For Columnar Liquid Crystalsmentioning

confidence: 99%

Discotic Liquid Crystals: From Tailor‐Made Synthesis to Plastic Electronics

et al. 2007

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Most associate liquid crystals with their everyday use in laptop computers, mobile phones, digital cameras, and other electronic devices. However, in contrast to their rodlike (calamitic) counterparts, first described in 1907 by Vorländer, disklike (discotic, columnar) liquid crystals, which were discovered in 1977 by Chandrasekhar et al., offer further applications as a result of their orientation in the columnar mesophase, making them ideal candidates for molecular wires in various optical and electronic devices such as photocopiers, laser printers, photovoltaic cells, light-emitting diodes, field-effect transistors, and holographic data storage. Beginning with an overview of the various mesophases and characterization methods, this Review will focus on the major classes of columnar mesogens rather than presenting a library of columnar liquid crystals. Emphasis will be given to efficient synthetic procedures, and relevant mesomorphic and physical properties. Finally, some applications and perspectives in materials science and molecular electronics will be discussed.

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Section: Classes Of Compounds Used For Columnar Liquid Crystalsmentioning

confidence: 99%

Discotic Liquid Crystals: From Tailor‐Made Synthesis to Plastic Electronics

et al. 2007

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“…Kato und Mitarbeiter106 steigerten die Lochbeweglichkeit in Triphenylen 35 d (Schema ) um das Dreifache durch Gelbildung mit wasserstoffverbrückten Fasern aus Peptidderivaten 107. Verbindung 35 d sowie eine Mischung aus 35 d und dem Triphenylen 44 c wurden hinsichtlich der Quanteneffizienz der Photogeneration von Ladungsträgern untersucht 108. Aus dem Photostrom schlossen Bushby, Boden und Mitarbeiter auf die Effizienz der Ladungsträgererzeugung; sie setzten dabei die Beziehung zwischen Strom und Quanteneffizienz voraus und nahmen an, dass keine Rekombination stattfindet.…”

Section: Diskotische Mesogene Für Columnare Flüssigkristalleunclassified

Structure and Reactivity of Homoleptic Samarium(II) and Thulium(II) Phospholyl Complexes

Turcitu

Nief

Ricard

2003

Chemistry A European J

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Potassium 2,5-di-tert-butyl-3,4-dimethylphospholide K(dtp) (9) was synthesised in 45 % yield from commercially available starting materials by using zirconacyclopentadiene chemistry. Reaction of the K salt of this bulky anion and of the previously described potassium 2,5-bis(trimethylsilyl)-3,4-dimethylphospholide K(dsp) (8) with SmI(2) in diethyl ether afforded the homoleptic samarium(II) complexes 7 and 6, respectively, whose solid-state structures, [[Sm(dtp)(2)](2)] (7 a) and [[Sm(dsp)(2)](2)] (6 a), are dimeric owing to coordination of the phosphorus lone pairs to samarium, as shown by X-ray crystallography. Reaction of 8 with TmI(2) in diethyl ether afforded [Tm(dsp)(2)(Et(2)O)], which could not be desolvated without decomposition. In contrast, the coordinated ether group of the solvate [Tm(dtp)(2)(Et(2)O)], obtained from 9 and TmI(2), could easily be removed by evaporation of the solvent and extraction with pentane at room temperature, and the monomer [Tm(dtp)(2)] (5) could be isolated and was characterised by X-ray crystallography. Presumably, steric crowding in 5 is too high for dimerisation to occur. Compound 5, the first Tm(II) homoleptic sandwich complex, is remarkably stable at room temperature in solution and did not noticeably react with nitrogen, in sharp contrast with other thulium(II) species. As expected, 5, 6 and 7 all reacted with azobenzene to give the trivalent complexes [Tm(dtp)(2)(N(2)Ph(2))] (13), [Sm(dsp)(2)(N(2)Ph(2))], (14) and [Sm(dtp)(2)(N(2)Ph(2))] (15), respectively; 13 and 14 were characterised by X-ray crystallography. Complex 5 immediately reacted with triphenylphosphane sulfide at room temperature to give [[Tm(dtp)(2)](2)(mu-S)] (16), which was characterised by X-ray crystallography, whereas samarium(II) complexes 6 and 7 did not noticeably react with Ph(3)PS over 24 h under the same conditions.

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“…Thus the columns may be described as molecular wires and, therefore, their potential applications in the field of organic one-dimensional conductors, photoconductors, light emitting diodes, photovoltaic solar cells and gas sensors have been sought. [12][13][14][15][16][17][18][19][20][21][22][23] The incorporation of metal nanoparticles in the supramolecular order of the columnar phase forming discotic liquid crystals would provide materials that possess the properties of the metal particles as well as the processing, handling and selfassembling properties of DLCs. Recently, we have reported the thermophysical properties of mixtures of hexanethiolatecapped GNPs and various DLCs.…”

Section: Introductionmentioning

confidence: 99%

Novel conducting nanocomposites: synthesis of triphenylene-covered gold nanoparticles and their insertion into a columnar matrix

et al. 2007

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Gold nanoparticles fully covered with triphenylene-based discotic liquid crystals (DLCs) were synthesized and dispersed in a columnar matrix. The thermophysical properties of these nanocomposites, studied using polarizing optical microscopy, differential scanning calorimetry and small angle X-ray diffraction studies (SAXS), confirm their insertion into the columnar matrix. The presence of the gold nanoparticles in the triphenylene-based DLCs does not disturb the nature of the mesophase other than altering the transition temperatures. We propose that the gold nanoparticles are distributed between the domain gaps of the DLCs in random disordered manner. Interestingly the DC conductivity measurements show an enhancement of the electrical conductivity by more than a million times upon doping of the discotic liquid crystals with the triphenylene-capped nanoparticles under ambient conditions.

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Quantum Efficiency of Photogeneration in Discotic Liquid Crystals: Part 1: Temperature and Wavelength Dependence

Cited by 11 publications

References 0 publications

Discotic Liquid Crystals: From Tailor‐Made Synthesis to Plastic Electronics

Discotic Liquid Crystals: From Tailor‐Made Synthesis to Plastic Electronics

Structure and Reactivity of Homoleptic Samarium(II) and Thulium(II) Phospholyl Complexes

Novel conducting nanocomposites: synthesis of triphenylene-covered gold nanoparticles and their insertion into a columnar matrix

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