Photochromic diarylethene-containing coordination compounds and the production thereof
AssigneeThe University of Hong Kong
InventorsVivian Yam, Chi-Chiu Ko
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Abstract
Diarylethene-containing ligands and their coordination compounds are described. The ligands display photochromism with UV excitation, while the coordination compounds display photochromism with both excitation in the UV region and excitation into lower energy absorption bands characteristic of the coordination compounds, through which the excitation wavelengths for the photocyclization can be extended from λ≦340 nm to wavelengths beyond 470 nm. Switching of the luminescence properties of the compounds has also been achieved through photochromic reactions.
Claims16
A photochromic coordination compound comprising a diarylethene with one or more donor atoms coordinated to an acceptor atom of the coordination unit.
A photochromic compound which is a diarylethene-containing coordination compound in which the diarylethene contains part of a mono- or poly-cyclic ring structure with one or more donor atom(s) or heteroatom(s) coordinated to a coordination unit [M], which contains an acceptor atom, M, expressed by the general formula (I):
- where unit B represents a mono- or poly-cyclic ring structure that contains one to four heteroatom(s) X, n is integer from 0 to 3, [M] represents a coordination unit containing an acceptor atom M, R1 and R6 individually represent an alkyl group or an alkoxy group, and R2 to R5 individually represent atoms or groups selected from the group of hydrogen atom, halogen atom, hydroxyl group, alkyl group, alkoxy group, cyano group, nitro group, alkylcarbonyl group, alkoxycarbonyl group, perfluoroalkyl group, aryl group, cycloalkyl group, arylcarbonyl group, aryloxycarbonyl group, mono- or dialkylaminocarbonyl group, alkylcarbonyloxy group, arylcarbonyloxy group, aryloxy group, alkoxycarbonyl group, and aryloxycarbonyloxy group.
Dependencies are inferred from the claim text.