3 research outputs found
Porphyrin–Polyyne [3]- and [5]Rotaxanes
Porphyrin–polyyne
[3]- and [5]Ârotaxanes have been synthesized
by condensing aldehyde–rotaxanes with pyrrole or dipyrromethane.
The crystal structure of a [3]Ârotaxane shows that the macrocycles
adopt compact conformations, holding the hexaynes near the porphyrin
core, and that the phenanthroline units form intermolecular π-stacked
dimers in the solid. Fluorescence spectra reveal singlet excited-state
energy transfer from the threaded hexayne to the porphyrin, from the
phenanthroline to the porphyrin, and from the phenanthroline to the
hexayne
Synthesis of Polyyne Rotaxanes
Active-metal templating has been used to synthesize rotaxanes consisting of a phenanthroline-based macrocycle threaded around a C8, C12, or C20 polyyne chain. The crystal structure of the C12 rotaxane has been determined. In the rhenium(I) carbonyl complex of this rotaxane, with Re(CO)<sub>3</sub>Cl coordinated to the phenanthroline macrocycle, the proximity of the polyyne chain quenches the luminescence of the rhenium. These rotaxanes offer a new approach to controlling the environment and interactions of a polyyne chain
Synthesis of Polyyne Rotaxanes
Active-metal templating has been used to synthesize rotaxanes consisting of a phenanthroline-based macrocycle threaded around a C8, C12, or C20 polyyne chain. The crystal structure of the C12 rotaxane has been determined. In the rhenium(I) carbonyl complex of this rotaxane, with Re(CO)<sub>3</sub>Cl coordinated to the phenanthroline macrocycle, the proximity of the polyyne chain quenches the luminescence of the rhenium. These rotaxanes offer a new approach to controlling the environment and interactions of a polyyne chain