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• W2987591106 endingPage "15329" @default.
• W2987591106 startingPage "15320" @default.
• W2987591106 abstract "Time-resolved transient absorption spectroscopy and computational analysis of D−π–A complexes comprising FeII donors and TiIV acceptors with the general formula RCp2Ti(C2Fc)2 (where RCp = Cp*, Cp, and MeOOCCp) and TMSCp2Ti(C2Fc)(C2R) (where R = Ph or CF3) are reported. The transient absorption spectra are consistent with an FeIII/TiIII metal-to-metal charge-transfer (MMCT) excited state for all complexes. Thus, excited-state decay is assigned to back-electron transfer (BET), the lifetime of which ranges from 18.8 to 41 ps. Though spectroscopic analysis suggests BET should fall into the Marcus inverted regime, the observed kinetics are not consistent with this assertion. TDDFT calculations reveal that the singlet metal-to-metal charge-transfer (1MMCT) excited state for the FeII/TiIV complexes is not purely MMCT in nature but is contaminated with the higher-energy 1Fc (d-d) state. For the diferrocenyl complexes, RCp2Ti(C2Fc)2, the ratio of MMCT to Fc centered character ranges from 57:43 for the Cp* complex to 85:15 for the MeOOCCp complex. For the diferrocenyl and monoferrocenyl complexes investigated herein, the excited-state lifetimes decrease with increased 1Fc character. The effect of CuI coordination was also analyzed by time-resolved transient absorption spectroscopy and reveals the elongation of the excited-state lifetime by 3 orders of magnitude to 63 ns. The transient spectra and TDDFT analysis suggest that the long-lived excited state in Cp2Ti(C2Fc)2·CuX (where X is Cl or Br) is a triplet iron species with an electron arrangement of TiIV–3FeII–CuI." @default.
• W2987591106 created "2019-11-22" @default.
• W2987591106 creator A5004161217 @default.
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• W2987591106 date "2019-11-05" @default.
• W2987591106 modified "2023-10-14" @default.
• W2987591106 title "Picosecond to Nanosecond Manipulation of Excited-State Lifetimes in Complexes with an Fe^II to Ti^IV Metal-to-Metal Charge Transfer: The Role of Ferrocene Centered Excited States" @default.
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• W2987591106 doi "https://doi.org/10.1021/acs.inorgchem.9b02316" @default.
• W2987591106 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/31686500" @default.
• W2987591106 hasPublicationYear "2019" @default.
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