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1. Tuning Intramolecular Charge Transfer in Antimony(V) Porphyrin through Axial Fluorination

   https://doi.org/10.1021/acsomega.4c01773  

   Holzer, Noah ; Sharma, Jatan K. ; D’Souza, Francis ; Poddutoori, Prashanth K. ( May 2024 , ACS Omega)
2. Anion-enhanced Excited State Charge Separation in a Spiro-locked N-Heterocycle-fused Push-Pull Zinc Porphyrin

   https://doi.org/DOI: 10.1039/d1sc00038a  

   Chahal, MK ; Liyanage, A ; Alsaleh, AZ ; Karr, PA ; Hill, JP ; D'Souza, F ( April 2021 , Chemical science)

   A new type of push-pull charge transfer complex, viz., a spiro-locked N-heterocycle-fused zinc porphyrin, ZnP-SQ, is shown to undergo excited state charge separation, which is enhanced by axial F- binding to the Zn center. In this push-pull design, the spiro-quinone group acts as a ‘lock’ promoting charge transfer interactions by constraining mutual coplanarity of the meso-phenol-substituted electron-rich Zn(II) porphyrin and an electron deficient N-heterocycle, as revealed by electrochemical and computational studies. Spectroelectrochemical studies have been used to identify the spectra of charge separated states, and charge separation upon photoexcitation of ZnP has been unequivocally established by using transient absorption spectroscopic techniques covering wide spatial and temperol regions. Further, global target analysis of the transient data using GloTarAn software is used to obtain the lifetimes of different photochemical events and reveal that fluoride anion complexation stabilizes the charge separated state to an appreciable extent. 

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3. Charge Transfer and Spin Dynamics in a Zinc Porphyrin Donor Covalently Linked to One or Two Naphthalenediimide Acceptors

   https://doi.org/10.1021/acs.jpca.0c10471  

   Bancroft, Laura ; Zhang, Jinyuan ; Harvey, Samantha M. ; Krzyaniak, Matthew D. ; Zhang, Peng ; Schaller, Richard D. ; Beratan, David N. ; Young, Ryan M. ; Wasielewski, Michael R. ( January 2021 , The Journal of Physical Chemistry A)

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4. Exciton coupling chirality in helicene-porphyrin conjugates

   https://doi.org/10.1039/D1CC03314J  

   Dhbaibi, Kais ; Matozzo, Paola ; Abella, Laura ; Jean, Marion ; Vanthuyne, Nicolas ; Autschbach, Jochen ; Favereau, Ludovic ; Crassous, Jeanne ( October 2021 , Chemical Communications)

   Enantiopure helicene-porphyrin conjugates were prepared. They show strong changes in their circular dichroic response as compared to classical helicene derivatives, with highly intense bisignate Exciton Coupling (EC) signal and Δ ε values up to 680 M −1 cm −1 for the Soret band. They also display circularly polarized fluorescence in the (far-)red region, with dissymmetry factors up to 7 × 10 −4 . 

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5. Efficient Photoinduced Energy Transfer in Porphyrin-Based Nanomaterials

   https://doi.org/10.1021/acs.jpcc.0c08985  

   Karam, Tony E. ; Siraj, Noureen ; Ranasinghe, Jeewan C. ; Kolic, Paulina E. ; Regmi, Bishnu P. ; Warner, Isiah M. ; Haber, Louis H. ( November 2020 , The Journal of Physical Chemistry C)

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