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The absorption band of the triad, BTZ\u2010BODIPY\u2010ZnP, and dyads, BTZ\u2010BODIPY and BODIPY\u2010ZnP, along with the reference compounds BTZ\u2010OMe, BODIPY\u2010OMe, and ZnP\u2010OMe exhibited characteristic bands corresponding to individual chromophores. Electrochemical measurements on BTZ\u2010BODIPY\u2010ZnP exhibited redox behavior similar to that of the reference compounds. Upon selective excitation of BTZ (\u2248290\u2005nm) in the BTZ\u2010BODIPY\u2010ZnP triad, the fluorescence of the BTZ moiety is quenched, due to photoinduced energy transfer (PEnT) from\n                    <jats:sup>1<\/jats:sup>\n                    BTZ\n                    <jats:sup>*<\/jats:sup>\n                    to the BODIPY moiety, followed by quenching of the BODIPY emission due to sequential PEnT from the\n                    <jats:sup>1<\/jats:sup>\n                    BODIPY* moiety to ZnP, resulting in the appearance of the ZnP emission, indicating the occurrence of a two\u2010step singlet\u2013singlet energy transfer. Further, a supramolecular tetrad, BTZ\u2010BODIPY\u2010ZnP:ImC\n                    <jats:sub>60<\/jats:sub>\n                    , was formed by axially coordinating the triad with imidazole\u2010appended fulleropyrrolidine (ImC\n                    <jats:sub>60<\/jats:sub>\n                    ), and parallel steady\u2010state measurements displayed the diminished emission of ZnP, which clearly indicated the occurrence of photoinduced electron transfer (PET) from\n                    <jats:sup>1<\/jats:sup>\n                    ZnP* to ImC\n                    <jats:sub>60<\/jats:sub>\n                    . Finally, femtosecond transient absorption spectral studies provided evidence for the sequential occurrence of PEnT and PET events, namely,\n                    <jats:sup>1<\/jats:sup>\n                    BTZ\n                    <jats:sup>*<\/jats:sup>\n                    \u2010BODIPY\u2010ZnP:ImC\n                    <jats:sub>60<\/jats:sub>\n                    \u2192BTZ\u2010\n                    <jats:sup>1<\/jats:sup>\n                    BODIPY\n                    <jats:sup>*<\/jats:sup>\n                    \u2010ZnP:ImC\n                    <jats:sub>60<\/jats:sub>\n                    \u2192BTZ\u2010BODIPY\u2010\n                    <jats:sup>1<\/jats:sup>\n                    ZnP\n                    <jats:sup>*<\/jats:sup>\n                    :ImC\n                    <jats:sub>60<\/jats:sub>\n                    \u2192BTZ\u2010BODIPY\u2010ZnP\n                    <jats:sup>.+<\/jats:sup>\n                    :ImC\n                    <jats:sub>60<\/jats:sub>\n                    <jats:sup>.\u2212<\/jats:sup>\n                    in the supramolecular tetrad. The evaluated rate of energy transfer,\n                    <jats:italic>k<\/jats:italic>\n                    <jats:sub>EnT<\/jats:sub>\n                    , was found to be 3\u20135\u00d710\n                    <jats:sup>10<\/jats:sup>\n                    \u2005s\n                    <jats:sup>\u22121<\/jats:sup>\n                    , which was slightly faster than that observed in the case of BODIPY\u2010ZnP and BTZ\u2010BODIPY\u2010ZnP, lacking the coordinated ImC\n                    <jats:sub>60<\/jats:sub>\n                    . The rate constants for charge separation and recombination,\n                    <jats:italic>k<\/jats:italic>\n                    <jats:sub>CS<\/jats:sub>\n                    and\n                    <jats:italic>k<\/jats:italic>\n                    <jats:sub>CR<\/jats:sub>\n                    , respectively, calculated by monitoring the rise and decay of C\n                    <jats:sub>60<\/jats:sub>\n                    <jats:sup>.\u2212<\/jats:sup>\n                    were found to be 5.5\u00d710\n                    <jats:sup>10<\/jats:sup>\n                    and 4.4\u00d710\n                    <jats:sup>8<\/jats:sup>\n                    \u2005s\n                    <jats:sup>\u22121<\/jats:sup>\n                    , respectively, for the BODIPY\u2010ZnP:ImC\n                    <jats:sub>60<\/jats:sub>\n                    triad, and 3.1\u00d710\n                    <jats:sup>10<\/jats:sup>\n                    and 4.9\u00d710\n                    <jats:sup>8<\/jats:sup>\n                    \u2005s\n                    <jats:sup>\u22121<\/jats:sup>\n                    , respectively, for the BTZ\u2010BODIPY\u2010ZnP:ImC\n                    <jats:sub>60<\/jats:sub>\n                    tetrad. Initial excitation of the tetrad, promoting two\u2010step energy transfer and a final electron\u2010transfer event, has been successfully demonstrated in the present study.\n                  <\/jats:p>","DOI":"10.1002\/chem.202004262","type":"journal-article","created":{"date-parts":[[2020,10,27]],"date-time":"2020-10-27T06:17:27Z","timestamp":1603779447000},"page":"2184-2195","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":17,"title":["One\u2010Photon Excitation Followed by a Three\u2010Step Sequential Energy\u2013Energy\u2013Electron Transfer Leading to a Charge\u2010Separated State in a Supramolecular Tetrad Featuring Benzothiazole\u2013Boron\u2010Dipyrromethene\u2013Zinc Porphyrin\u2013C\n                    <sub>60<\/sub>"],"prefix":"10.1002","volume":"27","author":[{"given":"Deepak","family":"Badgurjar","sequence":"first","affiliation":[{"name":"Department of Chemistry School of Chemical Sciences &amp; Pharmacy Central University of Rajasthan  Bandarsindri, Tehsil: Kishangarh, Dist. 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