Light‐Induced Bistability in the 2 D Coordination Network {[Fe(bbtr)3][BF4]2}∞: Wavelength‐Selective Addressing of Molecular Spin States1. Issue 34 (12th July 2013)

• Record Type: Journal Article
• Authors: Chakraborty, Pradip; Pillet, Sebastien; Bendeif, El‐Eulmi; Enachescu, Cristian; Bronisz, Robert; Hauser, Andreas
• Is Part Of: Chemistry. Volume 19:Issue 34(2013)
• Page Start: 11418
• Page End: 11428
• Publication Date: 2013-07-12
• Subjects: Chemistry -- Periodicals; 540
• DOI: 10.1002/chem.201301257
• Languages: English
• ISSNs: 0947-6539

Abstract

<abstract abstract-type="main" xml:lang="en"> <title>Abstract</title> <p>Whereas the neat polymeric Fe^II compound {[Fe(bbtr)₃][ClO₄]₂}_∞ (bbtr=1, 4‐di(1, 2, 3‐triazol‐1‐yl)butane) shows an abrupt spin transition centered at 107 K facilitated by a crystallographic symmetry breaking, in the covalently linked 2D coordination network of {[Fe(bbtr)₃][BF₄]₂}_∞, Fe^II stays in the high‐spin state down to 10 K. However, strong cooperative effects of elastic origin result in reversible, persistent, and wavelength‐selective photoswitching between the low‐spin and high‐spin manifolds. This compound thus shows true light‐induced bistability below 100 K. The persistent bidirectional optical switching behavior is discussed as a function of temperature, irradiation time, and intensity. Crystallographic studies reveal a photoinduced symmetry breaking and serve to establish the correlation between structure and cooperative effects. The static and kinetic behavior is explicated within the framework of the mean‐field approximation.</p> </abstract>