A5062813099- Photochemistry and Electron Transfer Studies
- Photochromic and Fluorescence Chemistry
- Porphyrin and Phthalocyanine Chemistry
- Photoreceptor and optogenetics research
- CO2 Reduction Techniques and Catalysts
- Radical Photochemical Reactions
- Metal complexes synthesis and properties
- Electrocatalysts for Energy Conversion
- Lanthanide and Transition Metal Complexes
- Surface Chemistry and Catalysis
- Metalloenzymes and iron-sulfur proteins
- X-ray Diffraction in Crystallography
- Luminescence and Fluorescent Materials
- Supramolecular Chemistry and Complexes
- Crystallization and Solubility Studies
- Molecular Sensors and Ion Detection
- Metal-Catalyzed Oxygenation Mechanisms
North Carolina State University
2019-2021
A new long-lived, visible-light-absorbing homoleptic Cu(I) metal-to-ligand charge transfer (MLCT) photosensitizer, [Cu(dchtmp)2]PF6 (dchtmp = 2,9-dicyclohexyl-3,4,7,8-tetramethyl-1,10-phenanthroline), has been synthesized, structurally characterized, and evaluated in terms of its molecular photophysics, electrochemistry, electronic structure. Static time-resolved transient absorption (TA) photoluminescence (PL) spectroscopy measured on the title compound CH2Cl2 (τ 2.6 μs, ΦPL 5.5%), CH3CN...
Metal-free chromophores that efficiently generate triplet excited states represent promising alternatives with respect to transition metal-containing photosensitizers, such as those featuring metal-to-ligand charge transfer states. However, molecular constructs have remained underexplored due the unclear relationship(s) between structure and efficient/rapid intersystem crossing. In this regard, we present a series of three thionated perinone serving newly conceived class heavy metal-free...
We present the synthesis, structural characterization, electronic structure calculations, and ultrafast supra-nanosecond photophysical properties of a series five bichromophores general formula [Re(5-R-phen)(CO)3(dmap)](PF6), where R is naphthalimide (NI), phen = 1,10-phenanthroline, dmap 4-dimethylaminopyridine. The NI chromophores were systematically modified at their 4-positions with -H -Br (BrNI), phenoxy (PONI), thiobenzene (PSNI), piperidine (PNI), rendering metal–organic (Re1–Re5,...
Molecules capable of both harvesting light and forming new chemical bonds hold promise for applications in the generation solar fuels, but such first-row transition metal photoelectrocatalysts are lacking. Here we report nickel H2 evolution, leveraging visible-light-driven photochemical evolution from bis(diphosphine)nickel hydride complexes. A suite experimental theoretical analyses, including time-resolved spectroscopy continuous irradiation quantum yield measurements, led to a proposed...
A series of nine Re(<sc>i</sc>) diimine dicarbonyl complexes the general molecular formula <italic>cis</italic>-[Re(N^N)<sub>2</sub>(CO)<sub>2</sub>]<sup>+</sup> (N^N are various 2,2′-bipyridine (bpy) or 1,10-phenanthroline (phen) derivatives) were prepared and spectroscopically investigated.
We present the synthesis, structural characterization, electronic structure calculations, and ultrafast supra-nanosecond photophysical properties of a series five Re(I) bichromophores exhibiting metal to ligand charge transfer (MLCT) excited states based on general formula fac-[Re(N∧N)(CO)3(PNI-py)]PF6, where PNI-py is 4-piperidinyl-1,8-naphthalimidepyridine N∧N diimine (Re1–5), along with their corresponding model chromophores 4-ethylpyridine was substituted for (Mod1–5). The ligands used...
In this work, a series of eight similarly structured perinone chromophores were synthesized and photophysically characterized to elucidate the electronic structural tunability their excited state properties, including redox potentials fluorescence lifetimes/quantum yields. Despite similar structure, these exhibited broad range visible absorption quantum yields, lifetimes. conjunction with static time-resolved spectroscopies from ultrafast nanosecond time regimes, time-dependent computational...
Two new Re( i ) metal–organic bichromophores containing a phenanthroline appended perinone are shown to quantitatively generate extremely long-lived triplet ligand-centered excited states.