Synthesis and magnetic properties of some crystalline nitroxide radicals
The syntheses of different nitroxide radicals are reported. The thermal behaviour of the nitroxide radicals was examined by polarizing microscopy, differential scanning calorimetry as well as X-ray diffraction experiments. Temperature dependent magnetic susceptibility measurements were carried out in order to determine the magnetic properties of these nitroxide radicals. The majority of the radicals presented here show weak antiferromagnetic exchange interactions.
Griesar,Soto-Bustamante,Haase
p. 567 - 575
(2007/10/03)
180. Some Novel Nematic Materials Bearing Two Lateral Nitrile Functions
More than fifty esters of 3-alkyl-6-hydroxy-1,2-benzenedicarbonitrile have been prepared.The new esters exhibit stable nematic phases of high negative dielectric anisotropy.The relationship between the clearing points of the esters and the various ring they incorporate is the same as that normally observed for nematic materials of positive dielectric anisotropy.
Kelly, Stephen M.,Huynh-Ba, Tuong
p. 1850 - 1859
(2007/10/02)
Cyano-substituted biphenyl compounds and liquid crystalline dielectrics containing the same
Biphenyl derivatives of the formula: STR1 wherein X is --CO--O-- or --O--CO--, R1 and R4 are alkyl of 1 to 10 carbon atoms, and one of R2 and R3 is CN and the other is H, are useful for lowering the dielectric anisotropy of liquid crystalline dielectrics.
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(2008/06/13)
Biphenyl esters and liquid crystalline mixtures comprising them
Biphenyl esters of the formula STR1 wherein X is --CO--O-- or --O--CO-- and R1 and R2 each are alkyl or alkoxy of 1 - 8 carbon atoms, enlarge significantly the temperature range of the nematic phase of liquid-crystalline compositions without adversely affecting other properties.
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(2008/06/13)
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