Conformational Impact on Energy Storage Efficiency of Subphthalocyanine-Fullerene Hybrids
Journal article, 2018

Hybrid molecules involving subphthalocyanine and Buckminsterfullerene derivatives are interesting candidates as heavy metal free triplet sensitizers. Subphthalocyanine efficiently absorbs visible photons and transfer the singlet excited state energy to the Buckminsterfullerene where intersystem crossing produces triplet states in high yield. Thus, far the efficiency of the triplet-generating photophysics in these systems has been hampered by back energy transfer to the subphthalocyanine triplet state resulting in loss of excitation energy. Herein an efficient strategy is realized to avoid loss of triplet energy by back energy transfer. A hybrid molecule based on subphthalocyanine and Buckminsterfullerene is presented in which dispersion-induced π-π interactions result in a molecular geometry where highly efficient through-space singlet excited state energy transfer takes place in one direction, whereas energy flow in the opposite direction via the triplet manifold is blocked by lack of orbital overlap. The approach opens for a new class of heavy-metal-free triplet sensitizers of particular relevance to the fields of photodynamic therapy and noncoherent photon upconversion.

Author

Jonas Sandby Lissau

University of Copenhagen

University of Southern Denmark

Alberto Viñas Muñoz

University of Copenhagen

Henrik Gotfredsen

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry

University of Copenhagen

Martyn Jevric

University of Copenhagen

M. B. Nielsen

University of Copenhagen

Theis I. Sølling

University of Copenhagen

Journal of Physical Chemistry A

1089-5639 (ISSN) 1520-5215 (eISSN)

Vol. 122 33 6683-6692

Subject Categories

Atom and Molecular Physics and Optics

Other Physics Topics

Theoretical Chemistry

DOI

10.1021/acs.jpca.8b06064

More information

Latest update

9/13/2018