Dibenzoquinone Cyclopentadithiophene Diradicaloids Show Optical Transitions of Different Spin States and Anomalous Near‐Infrared Emission

We have prepared a series of bis(semiquinone) compounds with dithiophene bridges of different length that evolve from closed‐shell (smaller compound) to full diradical (longer compound) for which the narrow singlet‐triplet energy gap allows the triplet population at 298 K. The medium size system has...

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Bibliographic Details
Published in:	Angewandte Chemie
Main Authors:	Privado, María, Moles Quintero, Sergio, Barrejón, Myriam, de La Cruz, Pilar, P. M., Janaarthana Babu, Casanova, David, Langa, Fernando, Casado, Juan
Format:	Journal Article
Language:	English
Published:	29-10-2024
Online Access:	Get full text
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Summary:	We have prepared a series of bis(semiquinone) compounds with dithiophene bridges of different length that evolve from closed‐shell (smaller compound) to full diradical (longer compound) for which the narrow singlet‐triplet energy gap allows the triplet population at 298 K. The medium size system has a variety of photonic properties with absorptions and emission in the optical near‐infrared region mediated by a unique case of anti‐Kasha emission. A whole set of optical absorption/emission and vibrational steady state spectroscopies as well as picosecond transient absorption spectroscopy, all complemented with spectroelectrochemistry and theoretical calculations, is presented.
ISSN:	0044-8249 1521-3757
DOI:	10.1002/ange.202413988