Compositions of photoswitchable materials
AssigneeCentre National de la Recherche Scientifique (CNRS)
InventorsBenoit Cormary, Isabelle Malfant
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Abstract
Method of production of a photochromic composite material, in which, starting from a photochromic ruthenium complex with nitrosyl ligand, with a silica matrix by a sol-gel process or with a biodegradable matrix, in particular of starch or of agar-agar, so that the photochromic ruthenium complex with nitrosyl ligand, in the crystalline state and in the form of nanoparticles, is inserted into the nanopores of the matrix.
Claims17
A sol-gel process for producing a photochromic composite material, in which, starting from a precursor and a photochromic ruthenium complex with a nitrosyl ligand, the following successive steps are carried out:
- hydrolysis, placing in a container, condensation, maturation and aging including final drying, where the pH, temperature and time are selected so that in the xerogel produced, depending on the shape of the container, the photochromic ruthenium complex with a nitrosyl ligand, in the crystalline state and in the form of nanoparticles, is inserted into the nanopores of the matrix, wherein, in combination,
- a silica matrix is selected as matrix, and
- a complex of the following formula is selected as photochromic ruthenium complex with a nitrosyl ligand:
- [Ru(NO)X(py-R)4]Y2, [Ru(NO)X(py-RR′)4]Y2, or [Ru(NO)X(py-RR′R″)4]Y2
- where:
- py denotes pyridine and Ru denotes ruthenium,
- X is selected from the family comprising Cl, Br, OH,
- Y is selected from the family comprising Cl, Br, BF4, PF6,
- R, R′, R″ are selected from the family comprising hydrogen, alkyl groups, alcohol groups, aldehyde groups, ketone groups, ester groups, ether groups, amine groups, amide groups and halogenated groups excluding the combination of a silica matrix and a photochromic ruthenium complex with a nitrosyl ligand of formula [Ru(NO)X(py-R)4]Y2 or [RuCl(NO)(py)4](PF6)2.½H2O.
A process for producing a photochromic composite material, in which, starting from a matrix and a photochromic ruthenium complex with a nitrosyl ligand, the following steps are carried out:
- dissolution of the biodegradable matrix, dispersion of the photochromic complex, placing in a container, drying, where the temperature and time are selected so that in the matrix produced, depending on the shape of the container, the photochromic ruthenium complex with a nitrosyl ligand, in the crystalline state and in the form of nanoparticles, is inserted into the nanopores of the matrix, in which, in combination:
- a biodegradable matrix, in particular of starch or of agar-agar, is selected as matrix, and
- a complex of the following formula is selected as photochromic ruthenium complex with a nitrosyl ligand:
- [Ru(NO)X(py-R)4]Y2, [Ru(NO)X(py-RR′)4]Y2, [Ru(NO)X(py-RR′R″)4]Y2 or [Ru(NO)X(py)4]Y2 where:
- py denotes pyridine and Ru denotes ruthenium,
- X is selected from the family comprising Cl, Br, OH,
- Y is selected from the family comprising Cl, Br, BF4,
- R, R′, R″ are selected from the family comprising hydrogen, alkyl groups, alcohol groups, aldehyde groups, ketone groups, ester groups, ether groups, amine groups, amide groups and halogenated groups.
Dependencies are inferred from the claim text.