Fluorescence Anisotropy Decay of Molecular Rotors with Acene Rotators in Viscous Solution.

ABSTRACT: Herein, we report the use of fluorescence anisotropy decay for measuring the rotation of six shape-persistent molecular rotors with central naphthalene (2), anthracene (3a, 3b, and 3c), tetracene (4), and pentacene (5) rotators axially linked by triple bonds to bulky trialkylsilyl groups of different sizes. Steady-state and time-resolved polarization measurements carried out in mineral oil confirmed that the vibrationally resolved lowest-energy absorption bands are characterized by a transition dipole moment oriented along the short acene axes, in the direction of the alkyne linkers. Fluorescence lifetimes increased significantly with increasing acene size and moderately with a decrease in the size of the trialkylsilyl group. The fluorescence aniso

SUBMITTER: Howe ME 

PROVIDER: S-EPMC8493762 | biostudies-literature | 2020 Jun

REPOSITORIES: biostudies-literature