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A 1D coordination compound made of a photochromic dithienylethene linker and [Dy(Tp2-py)F]+ units (with Tp2-py = tris(3-(2-pyridyl)pyrazolyl)hydroborate) and having tetrakis[3,5-bis(trifluoromethyl)phenyl]borate counterions is reported. Full photoconversion from the closed isomer to the open isomer of the dithienyethene within single crystals allow for monitoring of the transformation by photocrystallography. Magnetic slow relaxation as well as magnetic hysteresis are observed and can be both modulated upon light irradiation.

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Photocrystallography - common or exclusive?

Acta Crystallogr C Struct Chem

November 2024

Department of Chemistry, University of Warsaw, Żwirki i Wigury 101, 02-089 Warsaw, Poland.

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Methods in molecular photocrystallography.

Acta Crystallogr C Struct Chem

October 2024

Department of Chemistry, University of Bath, Bath, BA2 7AY, United Kingdom.

Article Synopsis
  • Advances in real-time chemical process tracking over the last 30 years have significant implications for designing new materials in fields like optoelectronics and sensors.
  • Photocrystallography, a technique using single-crystal X-ray crystallography, is crucial for studying light-matter interactions by determining the 3D structures of light-activated molecules in excited states.
  • The review highlights various methodologies for photocrystallographic studies, detailing how complexity increases with shorter excited state lifetimes and underlining the need for complementary techniques to fully grasp solid-state processes.
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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 Fe dimer of the form [Fe(HL)](BF)·2MeCN (HL = 3,5-bis{6-(2,2'-bipyridyl)}pyrazole).

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