- 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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- Photoconductive liquid-crystalline derivatives of 6-oxoverdazyl
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1,3,5-Triphenyl-6-oxoverdazyl radicals 1[n], in which each phenyl group is substituted with three alkylsulfanyl groups (n = 6, 8, 10), exhibit a monotropic columnar rectangular (Colr) phase below 60 °C. Detailed analysis of 1[n] revealed a broa
- Jankowiak, Aleksandra,Pociecha, Damian,Szczytko, Jacek,Monobe, Hirosato,Kaszynski, Piotr
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p. 2465 - 2468
(2012/04/04)
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