A5062717666- Porphyrin and Phthalocyanine Chemistry
- Luminescence and Fluorescent Materials
- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Nanoplatforms for cancer theranostics
- Photodynamic Therapy Research Studies
- Photochromic and Fluorescence Chemistry
- Photochemistry and Electron Transfer Studies
- Photoreceptor and optogenetics research
- Photosynthetic Processes and Mechanisms
- Molecular Sensors and Ion Detection
- Porphyrin Metabolism and Disorders
- Neonatal Health and Biochemistry
- Oxidative Organic Chemistry Reactions
- Crystallography and molecular interactions
- Organic Light-Emitting Diodes Research
- Radical Photochemical Reactions
- Organic Chemistry Cycloaddition Reactions
- Luminescence Properties of Advanced Materials
- Metal complexes synthesis and properties
- Infrared Thermography in Medicine
- Synthesis and pharmacology of benzodiazepine derivatives
- Liquid Crystal Research Advancements
- Metal-Catalyzed Oxygenation Mechanisms
- Analytical Chemistry and Sensors
Technological University Dublin
2019-2025
Institute of Polymers
2015-2024
Tampere University
2021
Karlsruhe Institute of Technology
2021
University of Helsinki
2021
Trinity College Dublin
2016-2021
Technical University of Munich
2021
Institute for Advanced Study
2021
St Petersburg University
2021
22q11 Ireland
2016-2021
Heavy atom-free BODIPY-anthracene dyads (BADs) generate locally excited triplet states by way of photoinduced electron transfer (PeT), followed recombination the resulting charge-separated (CSS). Subsequent quenching molecular oxygen produces singlet (1O2), which reacts with anthracene moiety yielding highly fluorescent species. The steric demand alkyl substituents in BODIPY subunit defines site 1O2 addition. Novel bis- and tetraepoxides bicyclic acetal products, arising from rearrangements...
A family of heavy atom-free BODIPY-anthracene dyads (BADs) exhibiting triplet excited state formation from charge-transfer states is reported. Four types BODIPY scaffolds, different in the alkyl substitution pattern, and four anthracene derivatives have been used to access BADs. Fluorescence intersystem crossing (ISC) these depend on donor-acceptor couplings can be accurately controlled by or media polarity. Under conditions that do not allow charge transfer (CT), exhibit fluorescence with...
Over the past two decades, application of photocatalytic reactions in organic synthesis has increased remarkably. Porphyrins, renowned for their exceptional photophysical properties, photostability, and prevalence natural catalytic processes, are attracting significant attention as promising photocatalysts proceeding through energy transfer one-electron transfer. In this work, we synthesized indium(III) complex...
A recently developed method of synthesis pi-extended porphyrins made it possible to prepare a series tetrabenzoporphyrins (TBP) with different numbers meso-aryl substituents. The photophysical parameters free-bases and Pd complexes meso-unsubstituted TBP's, 5,15-diaryl-TBP's (Ar2TBP's) 5,10,15,20-tetraaryl-TBP's (Ar4TBP's) were measured. For comparison, similarly meso-arylsubstituted fused nonaromatic cyclohexeno-rings, i.e. Ar(n)-tetracyclohexenoporphyrins (Ar(n)TCHP's, n = 0, 2, 4), also...
The synthesis and properties of a new family π-extended dipyrrins capable forming brightly fluorescent complexes with metal ions are reported. possess tunable spectral bands exhibit different emission depending on the mode coordination.
Abstract Non‐toxic and biocompatible triplet–triplet annihilation upconversion based nanocapsules (size less than 225 nm) were successfully fabricated by the combination of miniemulsion solvent evaporation techniques. A first type displays an spectrum characterized maximum emission at λ max = 550 nm under illumination red light, exc 633 nm. The second fluoresces 555 when excited with deep‐red 708 Conventional confocal laser scanning microscopy (CLSM) flow cytometry applied to determine...
Abstract Dyads combining BODIPY as an electron acceptor and pyrene or perylene donor subunits were prepared their photophysical properties studied by steady‐state transient spectroscopy. Depending on the structure of polarity media, dyads show either bright fluorescence photo‐induced transfer (PeT) in solution. Charge‐transfer (CT) states formed a result PeT found to yield triplet excited BODIPY. In presence molecular oxygen, sensitize singlet oxygen ( 1 O 2 ) with quantum yields up 0.75.
Triplet energy transfer enables efficient <italic>Z</italic>-to-<italic>E</italic> photoswitching of azobenzenes even with near-infrared light. Ultrafast intersystem crossing azobenzene makes the process entropy-driven and use endothermic sensitizer-azobenzene pairs.
Excited state dynamics, particularly intersystem crossing, of a set meso-substituted porphyrins bearing different electron–donor and acceptor groups was studied by pulse train fluorescence technique. Triplet quantum yield found to be critically dependent on the nature meso-substituents in porphyrin system. Porphyrins with meso methoxyphenyl were show high triplet yields ([Formula: see text] between 0.70 0.81). Moreover, quantity substitution pattern directly influence [Formula: text]....
Heavy-atom-free sensitizers forming long-living triplet excited states via the spin-orbit charge transfer intersystem crossing (SOCT-ISC) process have recently attracted attention due to their potential replace costly transition metal complexes in photonic applications. The efficiency of SOCT-ISC BODIPY donor-acceptor dyads, so far most thoroughly investigated class such sensitizers, can be finely tuned by structural modification. However, predicting state yields and reactive oxygen species...
A general method of synthesis 5,15-diaryltetrabenzoporphyrins (Ar 2TBPs) has been developed, based on 2 + condensation dipyrromethanes followed by oxidative aromatization. Two pathways to Ar 2TBPs were investigated: the tetrahydroisoindole pathway and dihydroisoindole pathway. In pathway, precursor 5,15-diaryltetracyclohexenoporphyrins (5,15-Ar 2TCHPs) assembled from cyclohexeno-fused meso-unsubstituted aromatic aldehydes or, alternatively, way classical MacDonald synthesis. first case,...
Triplet-triplet annihilation upconversion (TTA-UC) is an important type of optical process with applications in biophotonics, solar energy harvesting and photochemistry. In most the TTA-UC systems, formation triplet excited states takes place via spin-orbital interactions promoted by heavy atoms. Given crucial role atoms (especially noble metals, such as Pd Pt) promoting intersystem crossing (ISC) and, therefore, production UC luminescence, feasibility using more readily available...
Ru(II) complexes with polypyridyl ligands play a central role in the development of photocatalytic organic reactions. This work is aimed at structural modification such to increase their efficiency and adapt them for preparation reusable systems. Nine [Ru(phen)(bpy)2]2+-type (bpy = 2,2'-bipyridine, phen 1,10-phenanthroline) (Ru-Pcat) bearing P(O)(OEt)2 substituent attached core directly or through 1,4-phenylene linker were synthesized characterized by spectroscopic electrochemical...
We present a novel method to promote intersystem crossing (ISC) and triplet state formation in boron dipyrromethenes (BODIPYs) via asymmetrical substitution within the chromophore. This approach reduces synthetic complexity compared...
Bimanes, a class of molecules based on the 1H,7H-pyrazolo[1,2-a]pyrazole-1,7-dione scaffold, were first introduced by E. M. Kosower in 1978. In this study, we report topochemical cycloaddition diethyl 2,6-dichloro-1,7-dioxo-1H,7H-pyrazolo[1,2-a]pyrazole-3,5-dicarboxylate (Cl 2 B), initiated visible light. Crystal structure analysis confirmed that reactive double bonds are parallel and coplanar, line with Schmidt criteria for cycloaddition. Additionally, two other bimane derivatives different...
Abstract A new route to tetrabenzoporphyrins from the closest possible precursor of unstable isoindole was developed. key feature this is a dramatic facilitation thearomatization annelated rings, which most serious bottleneck in previous syntheses tetrabenzoporphyrins. The capabilities method are illustrated by synthesis meso ‐tetraaryltetrabenzoporphyrins, as well first unambiguous and characterization 5,15‐diphenyltetrabenzoporphyrin.(© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim,...
A synthetic route to symmetrical tetraaryltetraanthra[2,3]porphyrins (Ar(4)TAPs) was developed. Ar(4)TAPs bearing various substituents in meso-phenyls and anthracene residues were prepared from the corresponding pyrrolic precursors. The synthesized porphyrins possess high solubility exhibit remarkably strong absorption bands near-infrared region (790-950 nm). scope of method, selection peripheral substituents, choice metal, their influence on optical properties are discussed together with...
The molecular “chaff-flares” strategy for the protection of triplet excited state from quenching by oxygen.
Latest advances in design and synthesis of molecular systems for reversible singlet oxygen binding their applications optical biomedical research are discussed.
Diazocines are bridged azobenzenes with phenyl rings connected by a CH