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Title: Revealing Excited‐State Trajectories on Potential Energy Surfaces with Atomic Resolution in Real Time

Journal Article · · Angewandte Chemie (International Edition)
 [1];  [2];  [3];  [2];  [4];  [4];  [5];  [6];  [1];  [1];  [1];  [7];  [7];  [7];  [4];  [2]; ORCiD logo [3]
  1. Department of Chemistry Northwestern University IL 60208 Evanston USA
  2. Department of Chemistry University of Washington WA 98195 Seattle USA
  3. Department of Chemistry Northwestern University IL 60208 Evanston USA, Chemical Science and Engineering Division Argonne National Laboratory IL 60439 Lemont USA
  4. Department of Chemistry North Carolina State University NC 27695-8204 Raleigh USA
  5. Physical Sciences Division Pacific Northwest National Laboratory WA 99352 Richland USA
  6. Physics Department Technical University of Denmark 2800 Kongens Lyngby Denmark
  7. SLAC National Accelerator Laboratory Stanford University CA 94025 Menlo Park USA

Abstract Photoexcited molecular trajectories on potential energy surfaces (PESs) prior to thermalization are intimately connected to the photochemical reaction outcome. The excited‐state trajectories of a diplatinum complex featuring photo‐activated metal–metal σ ‐bond formation and associated Pt−Pt stretching motions were detected in real time using femtosecond wide‐angle X‐ray solution scattering. The observed motions correspond well with coherent vibrational wavepacket motions detected by femtosecond optical transient absorption. Two key coordinates for intersystem crossing have been identified, the Pt−Pt bond length and the orientation of the ligands coordinated with the platinum centers, along which the excited‐state trajectories can be projected onto the calculated PESs of the excited states. This investigation has gleaned novel insight into electronic transitions occurring on the time scales of vibrational motions measured in real time, revealing ultrafast nonadiabatic or non‐equilibrium processes along excited‐state trajectories involving multiple excited‐state PESs.

Sponsoring Organization:
USDOE
Grant/Contract Number:
NONE; AC02-06CH11357
OSTI ID:
1975882
Alternate ID(s):
OSTI ID: 2375498; OSTI ID: 2008219; OSTI ID: 1975884; OSTI ID: 1998181
Journal Information:
Angewandte Chemie (International Edition), Journal Name: Angewandte Chemie (International Edition) Journal Issue: 28 Vol. 62; ISSN 1433-7851
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
Germany
Language:
English

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