Electron-driven chirality switches

C - Chemistry – Metallurgy – 09 – K

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C09K 9/02 (2006.01) C07F 1/00 (2006.01) G02F 1/17 (2006.01)

Patent

CA 2393110

Complexes of organic ligands with a metal ion exhibit unique conformation and spectroscopic properties upon changes in oxidation state of the metal ion. The metal is a redox-active metal ion and may possess additional ligands bonded to it. The organic ligand has three "arms" that are linked together at a central atom; each arm contains atoms that may also coordinate to the metal ion. At least two of the arms possess chromophoric properties. At least one arm contains two different groups that may coordinate to the metal ion. In one oxidation state, a first atom binds to the metal. In a second oxidation state, a second atom binds to the metal. This change in coordination of the metal ion results in a rotation of one of the arms, which changes the orientation of another group, which inverses the orientation of the two chromophoric species with respect to one another.

L'invention concerne des complexes composés de ligands organiques et d'un ion métallique présentant une conformation unique et des propriétés spectroscopiques dépendant de changements de l'état d'oxydation de l'ion métallique. Le métal est un ion métallique à activité redox auquel peuvent être liés des ligands supplémentaires. Ce ligand organique comporte trois "bras" liés entre eux au niveau d'un atome central; chaque bras contient des atomes qui peuvent également se coordonner à l'ion métallique. Au moins deux bras présentent des propriétés chromophores. Au moins un de ces bras contient deux différents groupes qui peuvent se coordonner à l'ion métallique. Dans un premier état d'oxydation, un premier atome se lie au métal. Dans un second état d'oxydation, un second atome se lie au métal. Ce changement de coordination de l'ion métallique produit une rotation de l'un des bras, ce qui a pour effet de changer l'orientation d'un autre groupe et d'inverser l'orientation des deux espèces chromophores entre elles.

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