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Here, we report a detailed study on the PSC of a pyrazolate bridged platinum(II) binuclear complex, BFPtPZ (C^NPt(\u03bc\u2010pz\u2032)<jats:sub>2<\/jats:sub>PtC^N, C^N=2\u2010(2,4\u2010difluorophenyl)pyridine, pz\u2032=pyrazolate), a molecular butterfly, using time\u2010correlated single photon counting measurements at different wavelengths and sample temperatures. Analysis of the results obtained using dichloromethane (DCM) and ethylene carbonate (EC) as solvents enabled us to reveal an unexpected, strong solvent effect on the PSC processes. We show that a rapid PSC process with a characteristic timescale of 323\u2005ps is observed in DCM, which leads to an excitation equilibrium between the ligand center\/metal\u2010to\u2010ligand charge transfer (<jats:sup>3<\/jats:sup>LC\/MLCT) and metal\u2010metal\u2010to\u2010ligand charge transfer (<jats:sup>3<\/jats:sup>MMLCT) triplet states. The subsequent relaxation from these electronic states to the ground state takes place in several nanoseconds. In contrast, the corresponding PSC process in EC appears slow at all temperatures studied in our experiments and showed no sign of such excitation equilibrium. The observed solvent effect is found to arise from distinct solvent properties including their viscosities and polarities as well as the peculiar electronic excited\u2010states of the butterfly\u2010like molecules with charge transfer character.<\/jats:p>","DOI":"10.1002\/chem.201703259","type":"journal-article","created":{"date-parts":[[2017,10,18]],"date-time":"2017-10-18T09:42:37Z","timestamp":1508319757000},"page":"17734-17739","source":"Crossref","is-referenced-by-count":7,"title":["Solvent Effect on the Photoinduced Structural Change of a Phosphorescent Molecular Butterfly"],"prefix":"10.1002","volume":"23","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-8154-1006","authenticated-orcid":false,"given":"Ying\u2010Zhong","family":"Ma","sequence":"first","affiliation":[{"name":"Chemical Sciences Division Oak Ridge National Laboratory  Oak Ridge Tennessee 37831 USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Chenkun","family":"Zhou","sequence":"additional","affiliation":[{"name":"Department of Chemical and Biomedical Engineering FAMU-FSU College of Engineering  Tallahassee FL 32310 USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Benjamin","family":"Doughty","sequence":"additional","affiliation":[{"name":"Chemical Sciences Division Oak Ridge National Laboratory  Oak Ridge Tennessee 37831 USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Davis C.","family":"Easley","sequence":"additional","affiliation":[{"name":"Chemical Sciences Division Oak Ridge National Laboratory  Oak Ridge Tennessee 37831 USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Justin","family":"Deterding","sequence":"additional","affiliation":[{"name":"Chemical Sciences Division Oak Ridge National Laboratory  Oak Ridge Tennessee 37831 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