Preprint

PUBDB-2025-03871

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Photoinduced Low Spin to High Spin Transition in a [2x2] Fe(II) Metallogrid: Diode Laser-Pumped Photocrystallography at the P11 Beamline in PETRA III, DESY

Basuroy, K. (Corresponding author)XFEL.EU*DESY* ; Velazquez Garcia, J.Extern*XFEL.EU*DESY* ; Lalithambika, S. S. N. ; Barman, A.Extern*DESY* ; Reuss, T.XFEL.EU*DESY* ; Pompidor, G. ; Grebentsov, A. ; Akcaalan, O. ; Techert, S. (Corresponding author)XFEL.EU*DESY*

2025

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Please use a persistent id in citations: doi:10.3204/PUBDB-2025-03871

Report No.: arXiv:2508.01734

Abstract: We report on the photoinduced spin crossover (SCO) transition from a 2HS-2LS to a 3HS-1LS state in a [2x2] Fe(II) metallogrid complex using molecular crystals with static photocrystallography at a first ever attempt in the beamline P11 of the PETRA III synchrotron, DESY. A class 3B diode laser was used to induce the transition under controlled irradiation conditions. Structural characterization was achieved through single-crystal X-ray diffraction (SCXRD) measurements post-irradiation, revealing significant changes in average Fe-N distances, consistent with SCO behavior. Our experimental setup enables precise alignment necessary for photo-excitation using a class 3B diode laser along with a compact focusing optics. The longest dimension of the combined setup of the diode head and the focusing optics is not more than 32cm. The setup showcasing the utility of a compact diode laser system which can even be conveniently used in synchrotron-based pump-probe photocrystallography experiments for a wide range of molecular crystals.

Keyword(s): Materials Science (cond-mat.mtrl-sci) ; Chemical Physics (physics.chem-ph) ; Optics (physics.optics) ; FOS: Physical sciences

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Contributing Institute(s):

1. Strukturdynamik Chemischer Systeme (FS-SCS)

Research Program(s):

1. 6G3 - PETRA III (DESY) (POF4-6G3) (POF4-6G3)
2. FS-Proposal: I-20231431 (I-20231431) (I-20231431)

Experiment(s):

1. PETRA Beamline P11 (PETRA III)

Appears in the scientific report 2025

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