Toggle Main Menu Toggle Search

Open Access padlockePrints

Light-Harvesting Crystals Formed from BODIPY-Proline Biohybrid Conjugates: Antenna Effects and Excitonic Coupling

Lookup NU author(s): Sara Waly, Dr Joshua Karlsson, Dr Paul Waddell, Professor Andrew Benniston, Emeritus Professor Anthony Harriman



This is the authors' accepted manuscript of an article that has been published in its final definitive form by American Chemical Society, 2022.

For re-use rights please refer to the publisher's terms and conditions.


© 2022 American Chemical Society. A boron dipyrromethene (BODIPY) derivative bearing a cis-proline residue at the meso-position crystallizes in the form of platelets with strong (i.e., φF = 0.34) red fluorescence, but the absorption and emission spectra differ markedly from those for dilute solutions. A key building block for the crystal is a pseudo-dimer where hydrogen bonding aligns the proline groups and separates the terminal chromophores by ca. 25 Å. Comparison with a covalently linked bichromophore suggests that one-dimensional (1D) excitonic coupling between the terminals is too small to perturb the optical properties. However, accretion of the pseudo-dimer forms narrow channels possessing a high density of chromophores. The resultant absorption spectrum exhibits strong excitonic splitting, which can be explained quantitatively using the extended dipole approach and allowing for coupling between ca. 30 BODIPY units. Fluorescence, which decays with a lifetime of 2.2 ns, is assigned to a delocalized and (slightly) super-radiant BODIPY dimer situated at the interface and populated via electronic energy transfer from the interior.

Publication metadata

Author(s): Waly SM, Karlsson JKG, Waddell PG, Benniston AC, Harriman A

Publication type: Article

Publication status: Published

Journal: The Journal of Physical Chemistry Part A

Year: 2022

Volume: 126

Issue: 9

Pages: 1530–1541

Print publication date: 10/03/2022

Online publication date: 01/03/2022

Acceptance date: 15/02/2022

Date deposited: 11/04/2022

ISSN (print): 1089-5639

ISSN (electronic): 1520-5215

Publisher: American Chemical Society


DOI: 10.1021/acs.jpca.2c00035

ePrints DOI: 10.57711/ss8m-wy32

PubMed id: 35230124


Altmetrics provided by Altmetric


Funder referenceFunder name