Liquid-crystalline methanofullerodendrimers which display columnar mesomorphism
Date de parution
Journal of Materials Chemistry, Royal Society of Chemistry, 2008/18//1524-1534
Liquid-crystalline methanofullerodendrimers were synthesized <i>via</i> the Bingel addition reaction of mesomorphic malonate derivatives and C<sub>60</sub>. Second- and third-generation poly(benzyl ether) dendrons were selected as liquid-crystalline promoters to induce columnar mesomorphism. Based on a convergent and modular synthetic methodology, symmetrical (two identical dendrons) and non-symmetrical (two different dendrons) dendrimers were prepared, as well as hemidendrimers (only one dendron). The liquid-crystalline properties of the malonates and fullerodendrimers were investigated by polarized optical microscopy, differential scanning calorimetry, and X-ray diffraction. All the malonates give rise to hexagonal columnar phases of <i>p</i>6<i>mm</i> symmetry. As for the fullerodendrimers, the second-generation hemidendrimer shows a rectangular columnar phase of <i>c</i>2<i>mm</i> symmetry, while the other materials give rise to hexagonal columnar phases of <i>p</i>6<i>mm</i> symmetry.
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