title: Arylazopyrazoles: azoheteroarene photoswitches offering quantitative isomerization and long thermal half-lives.
abstract: Arylazopyrazoles, a novel class of five-membered azo photoswitches, offer quantitative photoswitching and high thermal stability of the Z isomer (half-lives of 10 and ∼1000 days). The conformation of the Z isomers of these compounds, and also the arylazopyrroles, is highly dependent on the substitution pattern on the heteroarene, allowing a twisted or planar geometry, which in turn has a significant impact on the electronic spectral properties of the compounds.
authors.affiliation: Department of Chemistry, Imperial College London , London SW7 2AZ, United Kingdom.
authors.forename: Claire E
authors.initials: CE
authors.lastname: Weston
authors.forename: Robert D
authors.initials: RD
authors.lastname: Richardson
authors.forename: Peter R
authors.initials: PR
authors.lastname: Haycock
authors.forename: Andrew J P
authors.initials: AJ
authors.lastname: White
authors.forename: Matthew J
authors.initials: MJ
authors.lastname: Fuchter
mesh_terms: D001391:Azo Compounds / Q000737:chemistry*; D006841:Hydrocarbons, Aromatic / Q000737:chemistry*; D007536:Isomerism; D015394:Molecular Structure; D055668:Photochemical Processes; D011720:Pyrazoles / Q000737:chemistry*; D013056:Spectrophotometry, Ultraviolet; D013696:Temperature; D013997:Time Factors
chemical_list: D001391:Azo Compounds; D006841:Hydrocarbons, Aromatic; D011720:Pyrazoles