Mesogenic/mesomorphic/mesophase

Trimethylbenzol) mesogen mesogen mesomerism Mesomeiie mesomorphic/ mesomorphous mesomorph mesomorphy Mesomorphic mesophase Mesophase... 

Mesogen (mesomorphic compound) - a compound that under suitable conditions of temperature, pressure and concentration can exist as a mesophase. 

As indicated above in chiral mesophases, the introduction of a functional group in mesogenic stmctures offers the opportunity to achieve functional LCs. With this aim, mesomorphic crown-ether-isocyanide-gold(I) complexes (26) have been prepared recently [38]. The derivatives with one alkoxy chain show monotropic SmC mesophases at or close to room temperature. In contrast, the complexes with three alkoxy chains behave as monotropic (n = 4) or enantiotropic (n > 4) LCs. The structure of the mesophases could not be fully eluddated because X-ray diffraction studies in the mesophase were unsuccessful and mesophase characterization was made only on the basis of polarized optical microscopy. These complexes are luminescent not only in the solid state and in solution, but also in the mesophase and in the isotropic liquid state at moderate temperatures. The emission spectra of 26a with n=12 were... 

Mesitylene, production from acetone, 1 164 Mesityl oxide, 14 589-590 characteristics of, 16 337 hydrogenation, 16 337-338 hydrogen peroxide treatment of, 16 338 Z-menthol from, 24 520 production of, 16 336-337 production from acetone, 1 164, 174 Mesogenic diols, 25 460 Mesogenic molecules, solids of, 15 82 Mesogens, 24 53, 54 Mesomixing, 16 683 Mesomorphic behavior, 24 53-54 Mesomorphic phase transitions, 15 102 Mesomorphism, 15 81. See also Liquid crystalline materials Mesophase pitch-based carbon fiber, 26 734-735... 

Similar compounds to those shown in Figure 7.25 have been prepared with a different mesomorphic isocyanide (Figure 7.27) [15]. All of them are mesogens and exhibit short-range SmA mesophases, except the perfluorophenylpyridine derivative, which shows an SmA phase in the range 87.4-215 °C. This much longer... 

In order fo furfher invesfigafe fhe influence of fhe sfrucfure of the mesogenic units on the mesomorphic behavior of the dendrimers, bulky units have been introduced at the periphery of the third and fourth generations of amino-terminated PAMAM and PPI (Fig. 39, L3, Le, L9), wifh the aim of achieving cubic mesophases, since the increased volume around the dendritic core could in principle force the dendrimer to adopt a globular conformation [199,222],... 

The mesomorphic properties of the G2 dendrimer were substantially modified by the grafting of mesogenic units containing a nitro group (Fig. 45, R = B, C) [256]. In both cases, the two unidentified phases disappeared, and only the SmC and SmA were observed (Table 12). For the dendrimer bearing the B moiety, the mesophases appeared at much lower temperatures than for the dendrimer functionalized by A groups, whereas for the compound bear-... 

Let us note that two homologues of the malonate addends and of the corresponding methanofullerene derivatives described above (Fig. 66) were also prepared with chiral pendant mesogenic groups, laterally attached (Fig. 69). Both the G1 [304] and G2 [57] fullerodendrimers were found to show a chiral nematic phase (Fig. 69, Gl G 26 N 69 1 G2 G 24.3 N 80.61), and are the first Ceo derivatives that possess a chiral mesophase the Gl Geo-free malonate was also mesomorphic (G 20 N 113 I). 

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