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• W2044334998 abstract "Substitution of each phenyl in 1,3,5-triphenyl-6-oxoverdazyl with three alkoxy groups induces an ordered columnar hexagonal phase (Colh(o)) below 130°C in 1b[n], while in the alkylsulfanyl analogues 1a[n] additional periodicity along the columns was found rendering the phase a true three-dimensional columnar hexagonal phase (Colh(3D)) below 60°C. Both series exhibit broad absorption bands in the visible region with maxima at 540 and 610 nm in series 1a[n] and at 486 and 614 nm in series 1b[n]. Unusual reversible thermochromism is observed in series 1b[n], in which the dark green isotropic phase turns red in the discotic phase. Analysis of 1a[8] revealed redox potentials E0/+11/2 = +0.99 V and E0/ −11/2 = –0.45 V vs. saturated calomel electrode (SCE), while the potentials in the alkoxy analogue 1b[8] are shifted cathodically by 0.16 V. Photovoltaic studies of 1a[8] demonstrated hole mobility of μh = 1.52 × 10−3 cm2 V−1 s−1 in the mesophase with an activation energy Ea = 0.06 ± 0.01 eV. Magnetisation studies of 1a[8] revealed nearly ideal paramagnetic behaviour in either the solid or fluid phase above 200 K and weak antiferromagnetic interactions at low temperatures. In contrast, a noticeable drop of about 4% in μeff was observed during the I→Col phase transition in 1b[8], which coincide with the thermochromic effect." @default.
• W2044334998 created "2016-06-24" @default.
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• W2044334998 date "2013-10-03" @default.
• W2044334998 modified "2023-09-25" @default.
• W2044334998 title "Discotic derivatives of 6-oxoverdazyl radical" @default.
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• W2044334998 doi "https://doi.org/10.1080/02678292.2013.828334" @default.
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