Highly Coupled Heterobicycle‐Fused Porphyrin Dimers: Excitonic Coupling and Charge Separation with Coordinated Fullerene, C 60

Moss, Austen; Jang, Youngwoo; Arvidson, Jacob; Wang, Hong; D'Souza, Francis

doi:10.1002/cssc.202202289

Highly Coupled Heterobicycle‐Fused Porphyrin Dimers: Excitonic Coupling and Charge Separation with Coordinated Fullerene, C ₆₀

Journal Article · 13 March 2023 · ChemSusChem

DOI:https://doi.org/10.1002/cssc.202202289· OSTI ID:2420585

Moss, Austen ^[1]; Jang, Youngwoo ^[2]; Arvidson, Jacob ^[2]; Wang, Hong ^[2]; ^[2]

Department of Chemistry University of North Texas Denton TX 76203 USA; OSTI
Department of Chemistry University of North Texas Denton TX 76203 USA

Abstract

Porphyrin dimers have been widely explored and studied owing to their importance in photosynthetic systems. A vast variety of dimers linked by different groups and at different angles have been synthesized and studied; however, the means by which to synthesize rigidly fused porphyrins with direct conjugation of the chromophores remains limited. Such a class of porphyrins may possess interesting properties that unconjugated or stacked dimers may not exhibit. In this study, bisbenzimidazole‐fused porphyrin dimers and their mono‐ and bis−zinc derivatives are synthesized and characterized. As a consequence of excitonic coupling, these dimers exhibit a split Soret band irrespective of the metal ion in the porphyrin cavity. Steady‐state fluorescence and excitation spectra followed by femtosecond transient absorption spectral studies of the heterometallated dimer, (free‐base and zinc porphyrin) reveals the occurrence of efficient singlet‐singlet energy transfer (>95 % efficiency and rate constant >10¹² s⁻¹) within the dyad. Further, donor‐acceptor conjugates were formed by metal‐ligand axial coordination of phenyl imidazole functionalized C₆₀and were characterized by a variety of physicochemical techniques. Excited state charge separation from both singlet and triplet excited states of ZnP in the conjugates has been established. The lifetime of the final charge‐separated state was in the 30–40 μs range revealing charge stabilization. Interestingly, no charge separation in the conjugate derived from the heterometallated dimer was observed wherein excitation transfer dominated the process. The present study brings out the importance of the rigid π‐spacer connecting porphyrin dimers in governing the energy and electron transfer events when coupled with an electron acceptor.

Research Organization:: Univ. of North Texas, Denton, TX (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

DOE Contract Number:: SC0016766

OSTI ID:: 2420585

Journal Information:: ChemSusChem, Journal Name: ChemSusChem Journal Issue: 8 Vol. 16; ISSN 1864-5631

Publisher:: ChemPubSoc Europe

Country of Publication:: United States

Language:: English

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Highly Coupled Heterobicycle‐Fused Porphyrin Dimers: Excitonic Coupling and Charge Separation with Coordinated Fullerene, C 60

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