Structure of the proton skeleton of nitrobenzene, determined by1H NMR in the nematic phase

NMR Studies of 13C-Iodomethane: Different Behavior in Thermotropic and Lyotropic Liquid Crystals

“…A similar approach involves interpolation of structural data measured in different liquid crystals to a hypothetical neutral solvent, using the value of D CH of methane in each solvent as the characteristic index of apparent distortion of the solute in each solvent. 19,20 However, no known thermotropic liquid crystalline solvent exhibits ideal behavior for all small solute molecules investigated. Also, this nonideal behavior intensifies in these solvents, whereas lyotropic liquid crystals of the type used in NMR spectroscopy of large biomolecules display more ideal behavior at low levels of molecular alignment.…”

“…Typical probe molecules include methane and its monosubstituted derivatives, as well as benzene. − In particular, D CH of methane is often used as an index of the nonideality of a solvent; − a solvent is regarded as ideal when D CH of dissolved methane is zero. A similar approach involves interpolation of structural data measured in different liquid crystals to a hypothetical neutral solvent, using the value of D CH of methane in each solvent as the characteristic index of apparent distortion of the solute in each solvent. , …”

Nitro substitution in achiral calamitic liquid crystals

“…The diOE erences in mesophases and transition temperatures observed in the correspond and 11-2, 11-3; 3-1 and 11-4, 11-5; 11-6 and 11-7, 11-8; 11-9 and 11-10, 11-11; 3-2 and 11-12; tables 3, 6, 8-11). ing 4-substituted nitro and cyano derivatives can be attributed to the diOE erence in the electronic and geoThis has been explained in terms of reducing intermolecular interactions and broadening of the molecules metric structures of the nitro [14-21, [23][24][25][26][27][166][167][168][169][170][171][172] and cyano groups [25, 173,174], which through intra- [2,3,5,9,32]. However, lateral nitro substitution can introduce mesomophases of enhanced thermostability in molecular [14-21, 27, 31, 175-194] and intermolecular [27,178,[195][196][197][198][199][200][201][202] interactions aOE ect molecular packing one-ring per uoroalkyl substituted benzene derivatives; this has been explained in terms of the predominant and, consequently, phase formation [203,204].…”