A New Photomagnetic Molecular System Based on Photoinduced Self-Assembly of Radicals

Imma Ratera; Daniel Ruiz-Molina; José Vidal-Gancedo; Klaus Wurst; Nathalie Daro; Jean-François Létard; Concepció Rovira; Jaume Veciana

doi:10.1002/1521-3773(20010302)40:5<919::AID-ANIE919>3.0.CO;2-G

A New Photomagnetic Molecular System Based on Photoinduced Self-Assembly of Radicals

Angew Chem Int Ed Engl. 2001 Mar 2;40(5):919-922. doi: 10.1002/1521-3773(20010302)40:5<919::AID-ANIE919>3.0.CO;2-G.

Authors

Imma Ratera¹, Daniel Ruiz-Molina¹, José Vidal-Gancedo¹, Klaus Wurst², Nathalie Daro³, Jean-François Létard³, Concepció Rovira¹, Jaume Veciana¹

Affiliations

¹ Institut de Ciencia de Materials de Barcelona (CSIC) Campus Universitari de Bellaterra 08193, Cerdanyola (Spain) Fax: (+34) 93-580-57-29.
² Institut für Allgemeine, Anorganische und Theoretische Chemie Universität Innsbruck Innrain 52a, 6020, Innsbruck (Austria).
³ Institut de Chimie de la Matière Condensée (ICMCB) Lab. des Sciences Moléculaires Château Brivazac 87 Avenue du Docteur A. Schweitzer UPR CNRS No 9048, 33608 Pessac Cedex (France).

PMID: 29712184
DOI: 10.1002/1521-3773(20010302)40:5<919::AID-ANIE919>3.0.CO;2-G

Abstract

An irreversible trans→cis isomerization of the imino group occurs during the irradiation of the new ferrocenyl Schiff-base polychlorotriphenylmethyl radical 1 by light. Low-temperature ESR investigations of frozen solutions revealed that the cis isomer exists as the (cis-1)₂ dimer with strong antiferromagnetic interactions. The radical 1 constitutes an example of a one-way photoswitchable magnetic system in which a conversion between a doublet and a singlet ground-state species is promoted by a photoinduced self-assembly process driven by the formation of hydrogen bonds.

Keywords: isomerization; magnetic properties; photochemistry; radicals; self-assembly.