Browsing by Subject "oxidation"

Article

A 1-D coordination polymer based on a Mn40 octagonal super-structure

Manoli, Maria; Inglis, R.; Manos, Manolis J.; Papaefstathìou, Giannis S.; Brechin, E. K.; Tasiopoulos, Anastasios J. (2013)

A 1-D coordination polymer, constructed using a combination of diols and phenolic oximes, contains a novel [Mn9] sub-unit, a nanosized [Mn40] octagonal super-structure and a [Mn21] repeating unit. © 2013 The Royal Society ...

Article

Activated biochar derived from cactus fibres - Preparation, characterization and application on Cu(II) removal from aqueous solutions

Hadjittofi, Loukia; Prodromou, Melpomeni; Pashalidis, Ioannis (2014)

The adsorption efficiency of activated biochar prepared from cactus fibres regarding the removal of Cu(II) from aqueous solutions has been investigated as a function of various physicochemical parameters (e.g. pH, initial ...

Article

Alpha spectroscopic analysis of actinides (Th, U and Pu) after separation from aqueous solutions by cation-exchange and liquid extraction

Kiliari, T.; Pashalidis, Ioannis (2010)

The radioactivity concentration of 236Pu, 232U and 228Th in aqueous samples has been determined by means of alpha spectroscopy after chemical separation and pre-concentration of the radionuclides by cation exchange and ...

Article

Catalytic oxidation of N -phenylamidrazones to 1,3-Diphenyl-1,4-dihydro-1, 2,4-benzotriazin-4-yls: An improved synthesis of blatters radical

Koutentis, Panayiotis Andreas; Lo Re, D. (2010)

Blatters radical, 1,3-diphenyl-1,4-dihydro-1,2,4-benzotriazin-4-yl (1a, R =H), and several of its C-7 substituted analogues (R =CF3, Cl, Br, I, Me, OMe) were prepared in good-to-excellent yields through catalytic oxidation ...

Article

Characterization and magnetic properties of a "super stable" radical 1,3-diphenyl-7-trifluoromethyl-1,4-dihydro-1,2,4-benzotriazin-4-yl

Constantinides, Christos P.; Koutentis, Panayiotis Andreas; Krassos, H.; Rawson, J. M.; Tasiopoulos, Anastasios J. (2011)

1,3-Diphenyl-7-trifluoromethyl-1,4-dihydro-1,2,4-benzotriazin-4-yl (4), prepared in SSSShigh yield via the catalytic oxidation of the corresponding amidrazone 5 by using Pd/C (1.6 mol ss%) and 1,8-diazabicyclo[5.4.0]undec-7-ene ...

Article

The conversion of 2-cyano cyanothioformanilides into 3-aminoindole-2- carbonitriles using triphenylphosphine

Koutentis, Panayiotis Andreas; Michaelidou, Sophia S. (2010)

2-Cyano cyanothioformanilide 3a reacts with triphenylphosphine in the presence of water to give 2-(cyanomethyleneamino)benzonitrile 4a, 2-(cyanomethylamino)benzonitrile 5, 3-aminoindole-2-carbonitrile 2a and (2-cyanoindo ...

Article

Discrete and encapsulated molecular grids: Homometallic Mn15 and heterometallic Mn24Ni2 aggregates

Charalambous, Maria; Zartilas, Sotiris M.; Moushi, Eleni E.; Papatriantafyllopoulou, Constantina; Manos, Manolis J.; Stamatatos, Theocharis C.; Mukherjee, S.; Nastopoulos, Vassilios; Christou, George; Tasiopoulos, Anastasios J. (2014)

Two molecular grid-like clusters are reported, one is a discrete [3 × 5] grid and the other a [3 × 4] grid within a Mn12Ni 2 loop. Both Mn24Ni2 and Mn15 aggregates display novel and aesthetically pleasing structures with ...

Article

Donor atom electrochemical contribution to redox potentials of square pyramidal vanadyl complexes

Vlasiou, Manolis; Drouza, Chryssoula; Kabanos, Themistoklis A.; Keramidas, Anastasios D. (2015)

A simple donor atom additivity relationship has been used to calculate the donor atom electrochemical contribution (DEC) of the Oac (acetylacetonate-enolic oxygen), OPh (phenolic oxygen), SPh (mercaptophenol sulfur), Nam ...

Article

Identification of the factors responsible for the in vitro pro-oxidant and cytotoxic activities of the olive polyphenols oleuropein and hydroxytyrosol

Odiatou, Elena M.; Skaltsounis, Alexios Leandros; Constantinou, Andreas I. (2013)

The olive polyphenols oleuropein and hydroxytyrosol were reported recently to produce extracellular hydrogen peroxide (H2O2) under standard culture conditions. The precise factors responsible for this production and the ...

Article

Mathematical modeling of the oxygen storage capacity phenomenon studied by CO pulse transient experiments over Pd/CeO2 catalyst

Costa, Costas N.; Christou, Stavroula Y.; Georgiou, Georgios C.; Efstathiou, Angelos M. (2003)

A mathematical model has been developed for the first time to study the oxygen storage capacity (OSC) phenomenon by the CO pulse injection technique over a 1 wt% Pd/CeO2 model catalyst in the 500-700°C range. A two-step ...

Article

Mathematical modeling of the oxygen storage capacity phenomenon studied by CO pulse transient experiments over Pd/CeO2 catalystAAA

Costa, Costas N.; Christou, Stavroula Y.; Georgiou, Georgios C.; Efstathiou, Angelos M. (2003)

A mathematical model has been developed for the first time to study the oxygen storage capacity (OSC) phenomenon by the CO pulse injection technique over a 1 wt% Pd/CeO2 model catalyst in the 500-700°C range. A two-step ...

Article

Model investigations for vanadium-protein interactions: Vanadium(III) compounds with dipeptides and their oxovanadium(IV) analogues

Tasiopoulos, Anastasios J.; Tolis, Evangelos I.; Tsangaris, John Michael; Evangelou, Angelos M.; Woollins, J. D.; Slawin, A. M. Z.; Pessoa, J. C.; Correia, I.; Kabanos, Themistoklis A. (2002)

The reaction of VCl3 with 1,10-phenanthroline and a series of dipeptides (H2dip), having aliphatic as well as aromatic side chains, in methyl alcohol and in the presence of triethylamine affords vanadium(III) compounds of ...

Article

Nitrite coordination in myoglobin

Ioannou, Androulla; Lambrou, Alexandra; Daskalakis, Vangelis; Pinakoulaki, Eftychia (2017)

The coordination of nitrite in myoglobin (Mb) has been characterized by resonance Raman spectroscopy and the frequencies of the nitrite bound to the heme Fe as well to the 2-vinyl have been computed by density functional ...

Article

A novel aggregate of [Mn2(μ-O)2] units: [Mn8O10(O2CMe)6(H2O) 2(bpy)6]4+ with a serpentine core

Tasiopoulos, Anastasios J.; Abboud, K. A.; Christou, George (2003)

The synthesis, characterization and initial reactivity studies are reported of the mixed-valence (MnIV 6MnIII 2) title compound, which possesses an unusual serpentine-like core and is the highest average oxidation state ...

Article

Preparation and crystal structures of MnII, mixed-valent MnII/MnIII, and MnIII polymeric compounds

Tasiopoulos, Anastasios J.; Harden, N. C.; Abboud, K. A.; Christou, George (2003)

The preparation and crystal structures of three polymeric Mn compounds are reported. The comproportionation reaction between Mn(OAc)2·4H2O and KMnO4 in MeOH-AcOH (2:3) leads to isolation of {[Mn(OH)(OAc)2]·AcOH·H2O}n (1). ...

Article

Preparation and surface characterisation of novel ceria-copper and ceria-manganese mixed oxides

Christophidou, Maria; Theocharis, Charis R. (2002)

The paper presents surface texture and catalysis results for a series of copper and manganese-containing ceria samples. These samples, especially the 20% manganese containing one, had significantly higher surface area than ...

Article

Probing nitrite coordination in horseradish peroxidase by resonance Raman spectroscopy: Detection of two binding sites

Ioannou, Androulla; Pinakoulaki, Eftychia (2017)

Nitrite is a powerful oxidant that affects the activity of peroxidases towards various substrates and leads to heme macrocycle modifications in members of the peroxidase family, such as the horseradish peroxidase (HRP). ...

Article

The protein effect in the structure of two ferryl-oxo intermediates at the same oxidation level in the heme copper binuclear center of cytochrome c oxidase

Pinakoulaki, Eftychia; Daskalakis, Vangelis; Ohta, T.; Richter, O. -M H.; Budiman, K.; Kitagawa, T.; Ludwig, B.; Varotsis, Constantinos (2013)

Identification of the intermediates and determination of their structures in the reduction of dioxygen to water by cytochrome c oxidase (CcO) are particularly important to understanding both O2 activation and proton pumping ...

Article

Redox chemistry of sulphate and uranium in a phosphogypsum tailings dump

Papanicolaou, F.; Antoniou, Stella; Pashalidis, Ioannis (2010)

The present study aims to assess the effect of redox conditions existing within the tailings dump on the stability of phosphogypsum (e.g. sulphate reduction) and uranium(VI). Phosphogypsum sampling and in-situ measurements ...

Article

Regiospecific synthesis of 5,7-disubstituted quinoxalino[2,3-b]phenazines

Koutentis, Panayiotis Andreas (2002)

Hydrogenation of the readily prepared dinitrobenzenediamines 7 followed by air oxidation affords the green colored 5,7-disubstituted-5H,12H-quinoxalino[2, 3-b]phenazines 3 in good yields. Mechanistic rationale, compound ...