Phenyl core

Figure 6 2,6-Trip2C6H3TI complex. Thallium-phenyl core is shown in a ball-and-stick representation peripheral phenyl groups with a tube representation isopropyl groups in wire frame.

The substitution of a methoxy group on the phenyl ring suppressed the mesophase, whereas a cyano group stabilized the SmA phase. When two long chains were grafted on both the biphenyl and phenyl cores (R = C H2n+i, R = Cm 2m+i), mesomorphism was suppressed. 

Mitchell, W.J., N. Kopidakis, G. Rumbles, D.S. Ginley, and S.E. Shaheen. 2005. The synthesis and properties of solution processable phenyl cored thiophene dendrimers. J Mater Chem 15 4518-4528. 

N. Kopidakis, W. J. Mitchell, J. Van de Lagemaat, D. S. Ginley, G. Rumbles, S. E. Shaheen and W. L. Ranee, Bulk heterojunction organic photovoltaic devices based on phenyl-cored thiophene dendrimers, Appl. Phys. Lett.,... 

Tris dendrimers (three dendrons attached to a 1,3,5-trisubstituted phenyl core) in compact and extended forms have been synthesized (figure la) as well as nanostars " consisting of a compact or extended dendron attached to a perylene trap (13 and 14). Their energy transfer rates and mechanisms have been studied extensively. " ... 

UV absorbers based on hydroxyphenyl benzotriazole derivatives or on oxalanilide derivatives have proven to be suitable stabilizers for polyamide. Due to the aliphatic side chain on the phenyl core, compatibility and their effectiveness with... 

A more recent continuation of this theme using (i )-3-methyladipic acid, was the systematic study of dimeric or twin structures which are capable of forming highly twisted helical structures [102-105]. These examples, differ from the previously mentioned Z7/5-azomethines in that they employ 2-pyrimidinylpheny] (116 and 117) and phenyl core units (118) they were made simply by esterification of (/ )-3-methyl-adipic acid with the appropriately substituted phenol using dicyclohexylcarbodiimide (DCC) and the catalyst 4-iV,iV-dimethyl-aminopyridine (DMAP). The structures and phase transitions of members of these two classes are given in structures 116 to 118. 

Zareba et al. [165] described the crystal structure of the chiral 4-(l-methyl-heptyloxycarbonyl)-phenyl 4-heptyloxytolane-4 -carboxylate (C7-tolane) which shows monotropic antiferroelectric and ferroelectric phases. The single-crystal X-ray analysis of this compound shows that the crystal has a smectic-like layer structure composed of largely bent molecules where the chain of the chiral group is almost perpendicular (86°) to the core moiety. Within the layers, the molecules are tilted. The central tolane group of the molecule is roughly planar. 

PBE dendrons bearing a focal bipyridine moiety have been demonstrated to coordinate to Ru + cations, exhibiting luminescence from the metal cation core by the excitation of the dendron subunits [28-30]. The terminal peripheral unit was examined (e.g., phenyl, naphthyl, 4-f-butylphenyl) to control the luminescence. The Ru +-cored dendrimer complexes are thought to be photo/redox-active, and photophysical properties, electrochemical behavior, and excited-state electron-transfer reactions are reported. 

Vinylphenyl-terminated PBE dendrons were prepared as polymerizable den-drons from 4-vinylbenzyl chloride [37]. The vinylphenyl-terminated PBE dendrons are useful to make the lanthanide-cored dendrimer complexes polymerizable. The Ist-generation Tb +-cored dendrimer complex bearing the vinyl-phenyl terminal on the dendron subunits (Fig. 5) was copolymerized with N-iso-propylacrylamide in the presence of methylene bis-acrylamide (as crosslinker) in DMSO to give a green-luminescence transparent gel. The DMSO gel was con-... 

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