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.

Abstract: A medical or therapeutic application of a composite material of ruthenium with a nitrosyl ligand. Application for a medical or therapeutic treatment of a composite material of ruthenium with a nitrosyl ligand irradiated in a spectral range capable of releasing the nitrosyl ligand, i.e., the ultraviolet or visible or near-infrared spectral range.

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.

Abstract: Sol-gel process for producing a photochromic composite material includes successive stages of hydrolysis, condensation, and drying, in which an alkoxysilane is selected as a precursor, and a ruthenium complex with a nitrosyl ligand is selected as a photochromic complex, and, in combination, the sol-gel process is implemented starting from the selected precursor and photochromic complex, with successive stages of hydrolysis, arrangement in a container of a selected shape, condensation, curing and aging, whereby this latter stage includes a final drying cycle, and for, the curing and aging stages, the pH, temperature and duration are selected so that in the produced xerogel, whose shape is determined by that 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 silica matrix, distributed in an at least substantially homogeneous way.

Abstract: Sol-gel process for producing a photochromic composite material, in which there is a precursor and a photochromic complex; the process includes successive stages of hydrolysis, condensation, and drying, in which: —an alkoxysilane is selected as a precursor, and a ruthenium complex with a nitrosyl ligand is selected as a photochromic complex, and, in combination, —the sol-gel process is implemented starting from the selected precursor and photochromic complex, with successive stages of hydrolysis, arrangement in a container of a selected shape, condensation, curing and aging, whereby this latter stage includes a final drying cycle, and—for the curing and aging stages—the pH, temperature and duration are selected so that in the produced xerogel, whose shape is determined by that 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 silica matrix, distributed in an at least substantially homoge