Duvinage, Daniel
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Item-typ:Veröffentlichung, Nitrile‐Substituted 2‐(Oxazolinyl)‐Phenols: Minimalistic Excited‐ State Intramolecular Proton Transfer (ESIPT)‐Based Fluorophores(Royal Society of Chemistry, 2020-05-04); ; ; Herein, we present minimalistic single-benzene, excited-state intramolecular proton transfer (ESIPT)-based fluorophores as powerful solid-state emitters. The very simple synthesis gave access to all four regioisomers of nitrile-substituted 2-(oxazolinyl)-phenols (MW = 216.1). In respect of their emission properties they can be divided into aggregation-induced emission enhancement (AIEE) luminophores (1-CN and 2-CN), dual state emission (DSE) emitters (3-CN) and aggregation-caused quenching (ACQ) fluorophores (4-CN). Remarkably, with compound 1-CN we discovered a minimalistic ESIPT-based fluorophore with extremely high quantum yield in the solid state ΦF = 87.3% at λem = 491 nm. Furthermore, quantum yields in solution were determined up to ΦF = 63.0%, combined with Stokes shifts up till 11.310 cm−1. Temperature dependent emission mapping, crystal structure analysis and time-dependent density functional theory (TDDFT) calculations gave deep insight into the origin of the emission properties.Wissenschaftlicher ArtikelBand:8Heft:2742 39 - Some of the metrics are blocked by yourconsent settings
Item-typ:Veröffentlichung, Kinetic stabilization of low valent main group compounds(2024-03-08); ; ; ; Highly reactive species, such as cations and radicals, are often proposed as intermediates in reaction mechanisms. The stabilization and isolation of such species is an ongoing challenge in chemistry. In this work a plethora of bis-substituted meta-terphenyl element compounds of group 13, 15 and 16 were synthesized and the first kinetically stabilized indinium ion (2,6-Mes2C6H3)2In+ as a 4 valence electron species, the first kinetically stabilized stibenium and bismuthenium ion (2,6-Mes2C6H3)2E+ (E = Sb, Bi) as 6 valence electron species and the first kinetically stabilized tellurenyl radical cation (2,6-Mes2C6H3)2Te*+ as a 7 valence electron species were successfully synthesized and fully characterized, opening a new area of compound classes.Dissertation402 221 - Some of the metrics are blocked by yourconsent settings
Item-typ:Veröffentlichung, Substitution Effect on 2-(Oxazolinyl)-phenols and 1,2,5-Chalcogenadiazole-Annulated Derivatives: Emission-Color-Tunable, Minimalistic Excited-State Intramolecular Proton Transfer (ESIPT)-Based Luminophores(American chemical society, 2021-09-28); ; ; ; Minimalistic 2-(oxazolinyl)-phenols substituted with different electron-donating and -withdrawing groups as well as 1,2,5-chalcogenadiazole-annulated derivatives thereof were synthesized and investigated in regard to their emission behavior in solution as well as in the solid state. Depending on the nature of the incorporated substituent and its position, emission efficiencies were increased or diminished, resulting in AIE or ACQ characteristics. Single-crystal analysis revealed J- and H-type packing motifs and a so-far undescribed isolation of ESIPT-based fluorophores in the keto form.Wissenschaftlicher ArtikelBand:86Heft:2146 48