A Magneto-optical Molecular Device: Interplay of Spin Crossover, Luminescence, Photomagnetism, and Photochromism

Marta Estrader; Jorge Salinas Uber; Leoní A Barrios; Jordi Garcia; Paul Lloyd-Williams; Olivier Roubeau; Simon J Teat; Guillem Aromí

doi:10.1002/anie.201709136

A Magneto-optical Molecular Device: Interplay of Spin Crossover, Luminescence, Photomagnetism, and Photochromism

Angew Chem Int Ed Engl. 2017 Dec 4;56(49):15622-15627. doi: 10.1002/anie.201709136. Epub 2017 Nov 13.

Authors

Marta Estrader^{1

2}, Jorge Salinas Uber¹, Leoní A Barrios¹, Jordi Garcia^{1

3}, Paul Lloyd-Williams^{1

3}, Olivier Roubeau⁴, Simon J Teat⁵, Guillem Aromí^{1

6}

Affiliations

¹ Departament de Química Inorgànica i Orgànica, Universitat de Barcelona, Diagonal 645, 08038, Barcelona, Spain.
² LPCNO, Université de Toulouse, CNRS, INSA, UPS, 135 avenue de Rangueil, 31077, Toulouse, France.
³ Institute of Biomedicine of the University of Barcelona (IBUB), Universitat de Barcelona, Spain.
⁴ Instituto de Ciencia de Materiales de Aragón (ICMA), CSIC and Universidad de Zaragoza, Plaza San Francisco s/n, 50009, Zaragoza, Spain.
⁵ Advanced Light Source, Berkeley Laboratory, 1 Cyclotron Road, Berkeley, CA, 94720, USA.
⁶ Institute of Nanoscience and Nanotechnology (IN2UB), Universitat de Barcelona, Spain.

PMID: 29057559
DOI: 10.1002/anie.201709136

Abstract

A bis(pyrazolylpyridyl) ligand, L, containing a central photochromic dithienylethene spacer predictably forms a ferrous [Fe₂ L₃ ]⁴⁺ helicate exhibiting spin crossover (SCO). In solution, the compound [Fe₂ L₃ ](ClO₄ )₄ (1) preserves the magnetic properties and is fluorescent. The structure of 1 is photo-switchable following the reversible ring closure/opening of the central dithienylethene via irradiation with UV/visible light. This photoisomerization switches on and off some emission bands of 1 and provides a means of externally manipulating the magnetic properties of the assembly.

Keywords: dithienylethene; fluorescence; molecular devices; photo-switching; spin crossover.

Publication types

Research Support, Non-U.S. Gov't
Research Support, U.S. Gov't, Non-P.H.S.