Browsing by Author "Drouza, Chryssoula"

Article

Aerial Oxidation of a VIV-Iminopyridine Hydroquinonate Complex: A Trap for the VIV-Semiquinonate Radical Intermediate

Stylianou, Marios; Drouza, Chryssoula; Giapintzakis, Ioannis; Athanasopoulos, Georgios I.; Keramidas, Anastasios D. (2015)

The reaction of 2,5-bis[N,N′-bis(2-pyridyl-aminomethyl)aminomethyl]-p-hydroquinone (H2bpymah) with VO2+ salts in acetonitrile or water at a low pH (2.2-3.5) results in the isolation of [{VIV(O)(Cl)}2(μ-bpymah)], the ...

Article

Charge distribution in vanadium p-(hydro/semi)quinonate complexes

Drouza, Chryssoula; Keramidas, Anastasios D. (2007)

The known crystal structures of co-ordination compounds containing p-dioxolene ligands in the form of hydroquinone, semiquinone or quinone have been examined. A simple method is proposed to correlate the oxidation state ...

Article

Controlled one pot synthesis of polyoxofluorovanadate molecular hybrids exhibiting peroxidase like activity

Nicolaou, Maria; Drouza, Chryssoula; Keramidas, Anastasios D. (2019)

Three unique mixed-valence polyoxofluorovanadate clusters have been synthesized through a facile preparation process. The structure of these clusters is controlled by the addition of organic ligands. Single-crystal X-ray ...

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 ...

Book Chapter

EPR Methods Applied on Food Analysis

Drouza, Chryssoula; Spanou, Smaragda; Keramidas, Anastasios D. (2018)

An overview of the different methodologies developed so far for the investigation of paramagnetic species in foods is presented. Electron paramagnetic resonance spectroscopy (EPR), also known as electron spin resonance ...

Article

From blatter radical to 7-substituted 1,3-diphenyl-1,4- dihydrothiazolo[5′,4′:4,5]benzo[1,2-e][1,2,4]triazin-4-yls: Toward multifunctional materials

Berezin, Andrey A.; Constantinides, Christos P.; Drouza, Chryssoula; Manoli, Maria; Koutentis, Panayiotis Andreas (2012)

A Blatter radical is oxidized to benzotriazin-7(H)-one which after amination and subsequent acyl- and aroylation gives N-(benzotriazin-6-yl) carboxamides that undergo ring closure with P 2S 5 to afford the corresponding ...

Article

Geographical discrimination of pine and fir honeys using multivariate analyses of major and minor honey components identified by 1H NMR and HPLC along with physicochemical data

Karabagias, Ioannis K.; Vlasiou, Manos; Kontakos, Stavros; Drouza, Chryssoula; Kontominas, Michael G.; Keramidas, Anastasios D. (2018)

The objective of the present work was the geographical discrimination of the most common honeydew honeys produced in Greece, namely pine and fir, on the basis of sugar, free amino acid and organic acid content, determined ...

Article

Investigation of dioxygen activation by copper(II)–iminate/aminate complexes

Papanikolaou, Michael G.; Hadjithoma, Sofia; Chatzikypraiou, Dimitra S.; Papaioannou, Dionysios; Drouza, Chryssoula; Tsipis, Athanassios C.; Miras, Haralampos N.; Keramidas, Anastasios D.; Kabanos, Themistoklis A. (2018)

The activation of dioxygen by metal ions is critical in chemical and bio-chemical processes. A scientific challenge is the elucidation of the activation site of dioxygen in some copper metalloproteins, which is either the ...

Article

Investigation on uranyl interaction with bioactive ligands. Synthesis and structural studies of the uranyl complexes with glycine and N-(2-mercaptopropionyl)glycine

Keramidas, Anastasios D.; Rikkou, Maria P.; Drouza, Chryssoula; Raptopoulou, Catherine P.; Terzis, Aris; Pashalidis, Ioannis (2002)

Three new uranium(VI) compounds have been prepared with glycine (Hgly), N-(2-mercaptopropionyl)glycine (Hmpg) and 2,2′-dithiobis(N-propionylglycine) (tpg). The crystal structure of [UO2(Hgly)2Cl2] has been solved, revealing ...

Article

NMR characterization and dynamics of vanadium(V) complexes with tripod (hydroquinonate/phenolate) iminodiacetate ligands in aqueous solution

Drouza, Chryssoula; Stylianou, Marios; Keramidas, Anastasios D. (2009)

Reaction of NH4VO3 with (phenolate/hydroquinonate) iminodiacetate tripod ligands in aqueous solution in the pH range 7-8 results in the isolation of three new dioxido vanadium(V) complexes, one dinuclear (NH4)4{(VVO)2[μ- ...

Article

Organic vanadium compounds - Transition state analogy with organic phosphorus compounds

Crans, D. C.; Keramidas, Anastasios D.; Drouza, Chryssoula (1996)

Vanadium compounds, particularly in oxidation state V, are potent inhibitors of phosphoryl group transfer enzymes. In this paper the existance of a correlation between the coordination geometry of a series of vanadium ...

Article

p-Hydroquinone-metal compounds: Synthesis and crystal structure of two novel VV-p-hydroquinonate and VIV-p-semiquinonate species

Drouza, Chryssoula; Tolis, V.; Gramlich, V.; Raptopoulou, Catherine P.; Terzis, Aris; Sigalas, Michael P.; Kabanos, Themistoklis A.; Keramidas, Anastasios D. (2002)

Reaction of the p-hydroquinone derivative H2Na4bicah·4H2O with either VIVOSO4·3H2O and NaVVO3 in equivalent quantities or with NaVVO3 yields the tetranuclear VIVO2+ macrocycle-semiquinonate compound Na6{(VIVO)4-(μ2-O) ...

Article

PH-potentiometric investigation towards chelating tendencies of p -hydroquinone and phenol iminodiacetate copper(II) complexes

Stylianou, Marios; Keramidas, Anastasios D.; Drouza, Chryssoula (2010)

Copper ions in the active sites of several proteins/enzymes interact with phenols and quinones, and this interaction is associated to the reactivity of the enzymes. In this study the speciation of the Cu 2+ with iminodiacetic ...

Article

Polyoxomolybdenum(V/VI)-sulfite compounds: Synthesis, structural, and physical studies

Kapakoglou, N. I.; Panagiotis, B. I.; Kazianis, S. E.; Kosmidis, C. E.; Drouza, Chryssoula; Manos, Manolis J.; Sigalas, Michael P.; Keramidas, Anastasios D.; Kabanos, Themistoklis A. (2007)

Reaction of Na2MoVIO4·2H 2O with (NH4)2SO3 in the mixed-solvent system H2O/CH3CN (pH = 5) resulted in the formation of the tetranuclear cluster (NH4)4[Mo 4VISO16]·H2O (1), while the same reaction in acidic aqueous solution ...

Article

Solid state and aqueous solution characterization of rectangular tetranuclear VIV/V-p-semiquinonate/hydroquinonate complexes exhibiting a proton induced electron transfer

Drouza, Chryssoula; Keramidas, Anastasios D. (2008)

Reaction of the non-innocent dinucleating ligand 2,5-bis[N,N- bis(carboxymethyl) arninomethyl]hydroquinone (H6bicah) with VO 2+ and VO43- salts in water in the pH range 2 to 4.5 provides a series of novel tetranuclear VIV ...

Article

Structural and electron paramagnetic resonance (EPR) characterization of novel vanadium(V/IV) complexes with hydroquinonate-iminodiacetate ligands exhibiting "noninnocent" activity

Drouza, Chryssoula; Stylianou, Marios; Papaphilippou, Petri Ch; Keramidas, Anastasios D. (2013)

Reaction of KVO3 with 2-[N,N′-(carboxymethyl)aminomethyl]-5-methylhydroquinone (H4mecah) in aqueous solution at pH 8.2 results in the isolation of mononuclear K2[VV(O)2{Hmecah(-3)}]·2H2O complex. On the other hand, reaction ...

Article

Structural characterization, hydrolytic stability and dynamics of cis-MoVIO22+ hydroquinonate/phenolate complexes

Drouza, Chryssoula; Hadjithoma, Sofia; Nicolaou, Maria; Keramidas, Anastasios D. (2018)

Although, the investigation of the interactions of MoVI ion with the “non-innocent” phenols/hydroquinones is essential for the understanding of the role of molybdenum in the biological systems, the MoVI complexes of ...

Article

Structure, reactivity, luminescence and magnetism of dinuclear Ln 3+ complexes produced by the Ln3+-assisted hydrolysis of 3,6-bis(2-pyridyl)tetrazine

Panayiotidou, L.; Drouza, Chryssoula; Arabatzis, N. B.; Lianos, P.; Stathatos, Elias; Viskadourakis, Zacharias A.; Giapintzakis, Ioannis; Keramidas, Anastasios D. (2013)

Twelve Pr3+, Sm3+, Eu3+, Gd3+, Tb3+ and Dy3+ complexes of N-(pyridin-2-ylmethylene) picolinohydrazonate (phzp-) were synthesized by the Ln3+ assisted hydrolysis of 3,6-bis(2-pyridyl)-1,2,4,5-tetrazine. Crystallographic ...

Article

Synthesis and aqueous solution properties of multinuclear oxo-bridged vanadium(IV/V) complexes

Drouza, Chryssoula; Keramidas, Anastasios D. (2000)

Reaction of the multifunctional phenolic ligands 2,5-bis[N,N-bis(carboxymethyl)aminomethyl]hydroquinone (H6cahq), 2,2'-bis[N,N-bis(carboxymethyl)aminomethyl]-4,4'-isopropylidenedi phenol (H6capd), 2,2',2''-tris[N,N-bis(c ...

Article

Synthesis and study of the cancer cell growth inhibitory properties of α-, γ-tocopheryl and γ-tocotrienyl 2-phenylselenyl succinates

Vraka, Panayiota S.; Drouza, Chryssoula; Rikkou, Maria P.; Odysseos, Andreani D.; Keramidas, Anastasios D. (2006)

Vitamin E succinate selenium-conjugated molecules were synthesized and their apoptogenic properties were evaluated. 4-Methyl-2-phenylselenyl succinate (4) was prepared by the reaction of sodium benzeneselenolate with ...