A5022872331- Porphyrin and Phthalocyanine Chemistry
- Advanced Photocatalysis Techniques
- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Luminescence and Fluorescent Materials
- Electrocatalysts for Energy Conversion
- Supramolecular Self-Assembly in Materials
- Molecular Junctions and Nanostructures
- TiO2 Photocatalysis and Solar Cells
- Fullerene Chemistry and Applications
- Electrochemical sensors and biosensors
- CO2 Reduction Techniques and Catalysts
- Organic Electronics and Photovoltaics
- Photochemistry and Electron Transfer Studies
- Photosynthetic Processes and Mechanisms
- Nanoplatforms for cancer theranostics
- Conducting polymers and applications
- Metalloenzymes and iron-sulfur proteins
- Photodynamic Therapy Research Studies
- Metal-Catalyzed Oxygenation Mechanisms
- Polydiacetylene-based materials and applications
- Advanced battery technologies research
- Surface Chemistry and Catalysis
- Advanced Nanomaterials in Catalysis
- Porphyrin Metabolism and Disorders
National Hellenic Research Foundation
2024-2025
University of Crete
2015-2024
National and Kapodistrian University of Athens
2023
Foundation for Research and Technology Hellas
2022-2023
Crete University Press
2021-2023
Technical University of Crete
2022
Division of Chemistry
2015-2020
University Hospital of Heraklion
2015-2017
National Veterinary Research Institute
2013
Japan Science and Technology Agency
2008
Approaches to enhance the performance of recent sensitizers employed in dye-sensitized NiO photocathodes for DSC and DSPEC devices are described.
Abstract Artificial light-harvesting systems have until now not been able to self-assemble into structures with a large photon capture cross-section that upon stimulus reversibly can switch an inactive state. Here we describe simple and robust F L -dipeptide construct which meso -tetraphenylporphyrin has appended self-assembles fibrils, platelets or nanospheres depending on the solvent composition. The functioning as quenched antennas, give intense excitonic couplets in electronic circular...
The boron dipyrrin (Bodipy) chromophore was combined with either a free-base or Zn porphyrin moiety (H2P and ZnP respectively), via an easy synthesis involving cyanuric chloride bridging unit, yielding dyads Bodipy-H2P (4) Bodipy-ZnP (5). photophysical properties of (5) were investigated by UV-Vis absorption emission spectroscopy, cyclic voltammetry, femtosecond transient spectroscopy. comparison the spectra voltammograms those their model compounds Bodipy, H2P, shows that spectroscopic...
A combination of noble-metal free components, a water soluble porphyrin photosensitizer zinc meso-tetrakis(1-methylpyridinium-4-yl)porphyrin chloride [ZnTMPyP4+]Cl4 (1) with cobaloxime complex [CoIII(dmgH)2(py)Cl] (2) as catalyst, creates an efficient system for photochemical hydrogen production acting under visible light 280 TONs. This is the first example catalysed H2 production.
In this report we describe the synthesis of multichromophore arrays consisting two Bodipy units axially bound to a Sn(IV) porphyrin center either via phenolate (3) or carboxylate (6) functionality. Absorption spectra and electrochemical studies show that chromophores interact weakly in ground state. However, steady-state emission excitation at room temperature reveal fluorescence from both 3 are strongly quenched suggesting that, excited state, energy and/or electron transfer might occur....
Exploring a catalytic reaction other than water oxidation at the photoanode of photoelectrochemical cell is probably key feature to more efficiently generate electrons needed produce solar fuels. In this framework, we describe herein fabrication TiO2-based dye-sensitized photo-electrosynthesis (DSPEC) using zinc porphyrin (ZnP) sensitizer and 2,2,6,6-tetramethyl-1-piperidine N-oxyl (TEMPO) organo-catalyst that quite catalyzes light-driven methoxybenzyl alcohol into aldehyde. Two dyads...
Abstract There is a growing interest in developing dye‐sensitized photocatalytic systems (DSPs) to produce molecular hydrogen (H 2 ) as alternative energy source. To improve the sustainability of this technology, we replaced sacrificial electron donor (SED), typically an expensive and polluting chemical, with alcohol oxidation catalyst. This study demonstrates first system using diketopyrrolopyrrole dye covalently linked 2,2,6,6‐tetramethyl‐1‐piperidine‐ N ‐oxyl (TEMPO) based catalyst for...
Abstract The covalent attachment of carbon nanohorns (CNHs) to α‐5‐(2‐aminophenyl)‐α‐15‐(2‐nitrophenyl)‐10,20‐bis(2,4,6‐trimethyl‐phenyl)‐porphyrin (H 2 P) via an amide bond is accomplished. resulting CNH–H P nanohybrids form a stable inklike solution. High‐resolution transmission electron microscopy (HRTEM) images demonstrate that the original dahlia‐flowerlike superstructure CNHs preserved in nanohybrids. Steady‐state and time‐resolved fluorescence studies show efficient quenching excited...
The syntheses, as well the photophysical and electrochemical characterization, of two novel BODIPY-porphyrin dyads their first application in lighting schemes are provided. benefits ascribed to unique features, namely (i) a good electronic alignment, (ii) remarkable efficient energy transfer, (iii) excellent film morphology, lead deep-red devices with stabilities around 1000 h efficiencies 0.13 Lm W(-1).
We report on the synthesis of hybrid molecules consisting a porphyrin or corrole chromophore axially coordinated to [CoIII(dmgH)2(Cl)]±0 (dmg = dimethylglyoxime) unit via pyridine group as potential hydrogen forming entities in H2O/THF medium. Photophysical, electrochemical, and pulse radiolysis studies hybrids and/or their separate components show that selective excitation its first singlet excited state leads fast charge separation due cobalt electron transfer. However, this is followed by...
Solar-driven hydrogen evolution experiments utilizing fibrilar and spherical nanostructures of the same porphyrin–peptide hybrid.
A series of protected phenylalanine and diphenylalanine derivatives have been coupled through a peptide bond to monoaminoporphyrin form new materials. comparative study in solution the solid state has performed confirmed interesting properties for self-assembled hybrid materials while conserving electronic chromophore. Thus, they are powerful candidates use dye-sensitized solar cells.
The covalent grafting through a rigid ester bond of dimeric porphyrin [(H2P)2] and carbon nanohorns (CNHs) was accomplished. newly formed CNH–(H2P)2 hybrid found to be soluble or dispersible in several organic solvents. Application diverse spectroscopic techniques verified the successful formation material. In addition, thermogravimetric analysis revealed amount (H2P)2 loading onto CNHs, TEM studies showed characteristic secondary spherical superstructure morphology Efficient fluorescence...
Graphene-based porphyrin molecule (GO-TPP), was used in high efficient ternary blend organic photovoltaics, demonstrating its universal role as electron cascade material.
In this work a peptide nucleic acid has been covalently linked with porphyrin and boron-dipyrromethene exhibiting self assembly properties light-harvesting capability.
The syntheses, the photophysical/electrochemical characterization, and first application in LECs of different metallated porphyrins are provided.
In this work, the diphenylalanine dipeptide was covalently attached to a tripyridyl porphyrin macrocycle and conveyed self-assembling properties resulting hybrid. This hybrid metallated with non-noble metals, Zn Sn, investigated toward photocatalytic hydrogen evolution. The Sn derivative, SnPy3P-FF, able produce photocatalytically in presence of known cobaloxime catalyst TEOA as sacrificial electron donor. When nanostructures SnPy3P-FF were employed system, enhanced production observed....
Porphyrin complexes are present in many natural systems and have significant biological roles, such as light harvesting, oxygen transport, catalysis. Owing to their intrinsic aromatic structure, porphyrin derivatives exhibit characteristic photophysical electrochemical properties. Porphyrins porphyrin-based been extensively utilized biomedical applications during the last decade. Specifically, porphyrinoids tested agents antimicrobial photodynamic therapy, well imaging (e.g., diagnosis of...
Antimicrobial resistance (AMR) poses a significant global health risk as consequence of misuse antibiotics. Owing to the increasing antimicrobial resistance, it became imperative develop novel molecules and materials with properties. Porphyrins metalloporphyrins are compounds which present properties especially after irradiation. As consequence, porphyrinoids have recently been utilized agents in photodynamic inactivation bacteria other microorganisms. Herein, we report encapsulation...
Although graphene's superior electrical, optoelectronic, thermal, and mechanical properties have been evident for 20 years now, its poor water dispersibility has hindered incorporation in many types of applications technologies. Strong examples this are biomedical environmental devices that require non-toxic, biocompatible media not toxic organic solvents like N-N'-Dimethylformamide, which graphene is readily dispersible. In work, we investigate a new way to prepare high-concentration stable...
Carbon nanohorns (CNHs) covalently functionalized at the conical tips with porphyrin (H2P) moieties were used to construct photoelectrochemical solar cells. Electrophoretic deposition was applied fabricate films of modified CNHs onto optically transparent electrodes (OTE) while nanostructured SnO2 cast OTE (OTE/SnO2). The CNH−H2P film on electrode exhibited an incident photon current conversion efficiency (IPCE) 5.8% bias +0.2 V vs SCE in a standard three-compartment electrochemical cell....