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@ARTICLE{VelazquezGarcia:618863,
      author       = {Velazquez Garcia, Jose and Basuroy, Krishnayan and Wong,
                      Joanne and Demeshko, Serhiy and Meyer, Franc and Kim, Insik
                      and Henning, Robert and Staechelin, Yannic and Lange, Holger
                      and Techert, Simone},
      title        = {{O}ut-of-equilibrium dynamics of a grid-like {F}e({II})spin
                      crossover dimer triggered by a two-photonexcitation},
      journal      = {Chemical science},
      volume       = {15},
      number       = {33},
      issn         = {2041-6520},
      address      = {Cambridge},
      publisher    = {RSC},
      reportid     = {PUBDB-2024-07201},
      pages        = {13531-13540},
      year         = {2024},
      abstract     = {The application of two-photon excitation (TPE) in the study
                      of light-responsive materials holds immense potential due to
                      its deeper penetration and reduced photodamage. Despite
                      these benefits, TPE has been underutilised in the
                      investigation of the photoinduced spin crossover (SCO)
                      phenomenon. Here, we employ TPE to delve into the
                      out-of-equilibrium dynamics of a SCO FeII dimer of the form
                      [FeII(HL)$_2$]$_2$(BF$_4$)$_4$·2MeCN (HL =
                      3,5-bis{6-(2,2′-bipyridyl)}pyrazole). Optical transient
                      absorption (OTA) spectroscopy in solution proves that the
                      same dynamics take place under both one-photon excitation
                      (OPE) and TPE. The results show the emergence of the
                      photoinduced high spin state in less than 2 ps and with a
                      lifetime of 147 ns. Time-resolved photocrystallography
                      (TRXRD) reveals a single molecular reorganisation within the
                      first 500 ps following TPE. Additionally, variable
                      temperature single crystal X-ray diffraction (VTSCXRD) and
                      magnetic susceptibility measurements confirm that the
                      thermal transition is silenced by the solvent. While the
                      results of the OTA and TRXRD utilising TPE are intriguing,
                      the high pump fluencies required to excite enough metal
                      centres to the high spin state may impair its practical
                      application. Nonetheless, this study sheds light on the
                      potential of TPE for the investigation of the
                      out-of-equilibrium dynamics of SCO complexes.},
      cin          = {FS-SCS},
      ddc          = {540},
      cid          = {I:(DE-H253)FS-SCS-20131031},
      pnm          = {631 - Matter – Dynamics, Mechanisms and Control
                      (POF4-631) / 6G3 - PETRA III (DESY) (POF4-6G3) / SFB 1073
                      B06 - Echtzeituntersuchungen der optischen Anregung in
                      oligonuklearen Metallkomplexen mit schaltbaren Spin- und
                      Ladungszuständen (B06) (240171831) / SFB 1073 C02 - In-situ
                      hochauflösende Untersuchung des aktiven Zustands bei der
                      (photo-) elektrochemischen Wasserspaltung (C02) (240172646)},
      pid          = {G:(DE-HGF)POF4-631 / G:(DE-HGF)POF4-6G3 /
                      G:(GEPRIS)240171831 / G:(GEPRIS)240172646},
      experiment   = {EXP:(DE-H253)P-P11-20150101},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {pmid:39183926},
      UT           = {WOS:001280613400001},
      doi          = {10.1039/d4sc02933j},
      url          = {https://bib-pubdb1.desy.de/record/618863},
}