- Induction of columnar discotic behavior in verdazyl radicals with alkylsulfanyl substituents
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Substitution of the 1,3,5-triphenyl-6-oxoverdazyl radical with n-alkylsulfanyl groups lead to derivatives 1[n], which exhibit a columnar rectangular phase (Colr) below 60 °C. Compounds 1[n] have a broad absorption band in the visible region with maxima at 540 and 610 nm and redox potentials E0/+1 1/2 = +0.99 V and E0/-1 1/2 =-0.45 V vs. SCE. Time-of-flight (TOF) investigation of 1[8] revealed hole mobility of μh = 1.52 × 10-3 cm2 V-1 s-1 in the columnar phase with an activation energy Ea = 0.06 ± 0.01 eV. Magnetization studies of 1[8] demonstrated nearly ideal paramagnetic behavior in both solid and fluid phases above 200 K and weak antiferromagnetic interactions at low temperatures. Verdazyl derivatives 1[n] were prepared in a sequence of reactions starting from 1-bromo-3,4,5-trifluorobenzene by alkylsulfanylation, followed by hydrazinylation, and finally 6-oxoverdazyl ring assembly using the Milcent method.
- Jankowiak, Aleksandra,Pociecha, Damian,Monobe, Hirosato,Szczytko, Jacek,Debska, Zaneta,Romanski, Jaroslaw,Kaszynski, Piotr
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p. 418 - 426
(2013/07/26)
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- Synthesis of 3,4-dialkylsulfanyl-and 3,4,5-trialkylsulfanyl derivatives of bromobenzene and benzaldehyde
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3,4-Dialkylsulfanyl-(1a[n], n = 8, 9, 11) and 3,4,5- trialkylsulfanylbromobenzenes (1b[n], n = 6, 8, 10, 12) were prepared from 3,4-difluoro-and 3,4,5-trifluorobromobenzene, respectively, in 50-60% yields. The bromobenzenes 1[n] were converted to benzalde
- Jankowiak, Aleksandra,Debska, Zaneta,Romanski, Jarosaw,Kaszynski, Piotr
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experimental part
p. 1 - 7
(2012/07/03)
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- Synthesis and properties of novel fluoroionophores for Ag+-optode sensing based on oligophenylenevinylenes
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Novel hexylsulfanyl substituted oligophenylenevinylenes have been designed and synthesized as fluoroionophores which selectively detect Ag+ ions in membrane optode sensors. In addition, the 4-phenyl-ring oligomer-based optode sensor exhibits higher sensitivity than that of the 3-phenyl-ring counterpart. (C) 2000 Elsevier Science Ltd.
- Man Shing Wong,Wing Hong Chan,Wai Yin Chan,Li,Dan
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p. 9293 - 9297
(2007/10/03)
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