1,721,016 research outputs found
Synthesis of Azaphosphinines by Directed Inverse‐Electron‐Demand Hetero‐Diels–Alder Reactions with Na(OCP)
No full textPyrylenes: A New Class of Tunable, Redox-Switchable, Photoexcitable Pyrylium–Carbene Hybrids with Three Stable Redox-States
No full text"La pittura di storia: teoria e prassi. La sala delle Guardie del Corpo nel Palazzo Reale di Torino e il dibattito fino agli anni Quaranta dell'Ottocento"
No full text
Electronic supplement to Imidazo[1,5-a]pyridines – A Versatile Platform for Structurally Distinct N-Heterocyclic Olefins and π-Extended Heterocycles
No full textThe dataset contains NMR spectra (NMR), IR spectra, UV-Vis data, Cyclic Voltammograms (CV), EPR data and ORCA output files (DFT). The data is structured according to synthesized compounds, which can be identified by the related publication (Schemes 2, 3 and Figure 3). The files can be opened with standard programs (e.g. NMR -> TopSpin, MestReNova; OpenMS, IR -> Spectragryph, BRUKER OPUS).The synthesis of polarized N-heterocyclic olefins (NHOs) based on an imidazo[1,5-a]pyridine scaffold is presented. In contrast to regular NHOs the unique bicyclic heterocyclic core allows the incorporation of various substituents in close proximity to the highly polarized exocyclic C–C bond. The donor properties of the new carbon-based ligand class were quantified and the coordination chemistry explored. Alkenyl or alkynyl groups at the C5-position lead to spontaneous cyclization to yield imidazo[2,1,5-de]quinolizines. The unique cyclization strategy was compatible with a wide range of substitution patterns and yields highly electron-rich π-delocalized heterocycles. The electronic structure of the novel partially antiaromatic heterocycle was thoroughly investigated. One-electron oxidation occurs at low potentials and lead to a stable monomeric radical-cation confirmed by XRD, which showed solution phase fluorescence expanding into the field of open-shell organic materials
Organische Vier‐Elektronen Redox‐Systeme basierend auf Bipyridin‐ und Phenanthrolin‐Carben‐Architekturen
No full textDeutsche Forschungsgemeinschaft https://doi.org/10.13039/50110000165
Organic Four‐Electron Redox Systems Based on Bipyridine and Phenanthroline Carbene Architectures
No full textNovel organic redox systems that display multistage redox behaviour are highly sought‐after for a series of applications such as organic batteries or electrochromic materials. Here we describe a simple strategy to transfer well‐known two‐electron redox active bipyridine and phenanthroline architectures into novel strongly reducing four‐electron redox systems featuring fully reversible redox events with up to five stable oxidation states. We give spectroscopic and structural insight into the changes involved in the redox‐events and present characterization data on all isolated oxidation states. The redox‐systems feature strong UV/Vis/NIR polyelectrochromic properties such as distinct strong NIR absorptions in the mixed valence states. Two‐electron charge–discharge cycling studies indicate high electrochemical stability at strongly negative potentials, rendering the new redox architectures promising lead structures for multi‐electron anolyte materials
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