Liquid-crystalline methanofullerodendrimers which display columnar mesomorphism
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J. Mater. Chem.
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Liq.-cryst. methanofullerodendrimers were synthesized via the Bingel addn. reaction of mesomorphic malonate derivs. and C60. Second- and third-generation poly(benzyl ether) dendrons were selected as liq.-cryst. promoters to induce columnar mesomorphism. Based on a convergent and modular synthetic methodol., sym. (two identical dendrons) and non-sym. (two different dendrons) dendrimers were prepd., as well as hemidendrimers (only one dendron). The liq.-cryst. 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 p6mm symmetry. As for the fullerodendrimers, the second-generation hemidendrimer shows a rectangular columnar phase of c2mm symmetry, while the other materials give rise to hexagonal columnar phases of p6mm symmetry. [on SciFinder(R)]
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Resource Types::text::journal::journal article