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Towards longer-lived metal-to-ligand charge transfer states of iron(II) complexes: an N-heterocyclic carbene approach.
A 9 ps (3)MLCT lifetime was achieved by a Fe(II) complex based on C(NHC)^N(py)^C(NHC) pincer ligands. This is the longest known so far for any kind of complexes of this abundant metal, and increased
Ultrafast Dynamics of Hole Injection and Recombination in Organometal Halide Perovskite Using Nickel Oxide as p-Type Contact Electrode.
TLDR
Using time-resolved terahertz spectroscopy, it is shown that hole transfer is complete on the subpicosecond time scale, driven by the favorable band alignment between the valence bands of perovskite and NiO nanoparticles (NiO(np).
Superior photoprotective motifs and mechanisms in eumelanins uncovered.
TLDR
The discovery that DHICA-based scaffolds specifically confer uniquely robust photoprotective properties to natural eumelanins settles a fundamental gap in the biology of human pigmentation and opens the doorway to attractive advances and applications.
Control of the size and shape of TiO2 nanoparticles in restricted media.
TLDR
The hitherto elusive hexagonal phase of TiO2 nanoparticles has been stabilized and the synthesis ofTiO2 in the rutile phase has been achieved under mild conditions.
Excited-State Proton-Transfer Processes of DHICA Resolved: From Sub-Picoseconds to Nanoseconds.
TLDR
Time-resolved fluorescence spectroscopy shows that the previously proposed, but unresolved, excited-state intramolecular proton transfer (ESIPT) of the eumelanin building block 5,6-dihydroxyindole-2-carboxylic acid (DHICA) occurs with a time constant of 300 fs in aqueous solution but completely stops in methanol.
Matrix-isolation and Ab initio study of the HKrCl...HCl complex.
TLDR
Bands of the HKrCl...(HCl)(2) complex are tentatively identified with a very large shift of ca.
Bottom-up approach to eumelanin photoprotection: emission dynamics in parallel sets of water-soluble 5,6-dihydroxyindole-based model systems.
TLDR
Data showed that dimerization and polymerization of DHI result in long-lived excited states with profoundly altered properties relative to the monomer and that glycosylation ofDHI imparts monomer-like behavior to oligomers and polymers, due to steric effects hindering planar conformations and efficient interunit electron communication.
Sequential Proton-Coupled Electron Transfer Mediates Excited-State Deactivation of a Eumelanin Building Block.
TLDR
Spectroscopic data show that deactivation of the lowest excited state of DHI in aqueous buffer proceeds on the 100 ps time scale and is 20 times faster than in methanol, which would prompt a revision of current notions about eumelanin photophysics and photobiology.
Watching the dynamics of electrons and atoms at work in solar energy conversion.
TLDR
This work illustrates how ultrafast optical and X-ray techniques can disentangle the influence of spin, electronic and nuclear factors on the intramolecular electron transfer process.
Photophysics of indole-2-carboxylic acid in an aqueous environment studied by fluorescence spectroscopy in combination with ab initio calculations.
TLDR
This work explores the feasibility of combining spectroscopic and quantum-chemical data into one consistent model of indole-2-carboxylic acid in aqueous media and determines excited state dynamics by time-resolved fluorescence experiments.
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