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Zeitschrift für Kristallographie - Crystalline Materials

Editor-in-Chief: Pöttgen, Rainer

Ed. by Antipov, Evgeny / Boldyreva, Elena V. / Friese, Karen / Huppertz, Hubert / Jahn, Sandro / Tiekink, E. R. T.

IMPACT FACTOR 2018: 1.090
5-year IMPACT FACTOR: 2.159

CiteScore 2018: 1.47

SCImago Journal Rank (SJR) 2018: 0.892
Source Normalized Impact per Paper (SNIP) 2018: 0.722

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Out-of-equilibrium charge density distribution of spin crossover complexes from steady-state photocrystallographic measurements: experimental methodology and results

Sébastien Pillet / Vincent Legrand / Hans-Peter Weber / Mohamed Souhassou / Jean-François Létard / Philippe Guionneau / Claude Lecomte
Published Online: 2009-09-25 | DOI: https://doi.org/10.1524/zkri.2008.0023


The electron density distribution of a light-induced molecular excited state, i.e. the high spin metastable state of [Fe(phen)2(NCS)2], was determined from steady-state photocrystallographic measurements. We defined the experimental conditions under which the accuracy of the measured diffraction data is compatible with an electron density analysis. These include: (i) a large structural and electronic contrast between high spin (HS) and low spin (LS) states, (ii) an efficient photoconversion under light irradiation and (iii) slow relaxation of the HS metastable state. Multipolar modeling of the electron density yielded a deformation density and 3d-orbital populations for Fe(II) characteristic of a high spin (t2g4eg2) electron configuration and support the assumption of significant σ-donation and π-backbonding of the Fe—N interactions. The electron density distribution in the intermolecular regions confirms anisotropic intermolecular interactions with possibly a layer topology parallel to the orthorhombic (ab) plane, related to the system cooperativity.

Keywords: Electron density; Photocrystallography; Molecular magnetic material; Spin crossover

About the article

Received: 2007-10-11

Accepted: 2007-12-05

Published Online: 2009-09-25

Published in Print: 2008-05-01

Citation Information: Zeitschrift für Kristallographie - Crystalline Materials, Volume 223, Issue 4-5/2008, Pages 235–249, ISSN (Online) 2196-7105, ISSN (Print) 2194-4946, DOI: https://doi.org/10.1524/zkri.2008.0023.

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