Browsing by Author "Keramidas, Anastasios D."
Now showing items 21-40 of 67
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Model Investigations for Vanadium-Protein Interactions: Synthesis and X-ray Structures of mer-[VOCl3(Hpycan)] and [VOCl2(CH3CN)(Hpycan)] {Hpycan = N-(2-Nitrophenyl)pyridine-2-carboxamide)
Kabanos, Themistoklis A.; Keramidas, Anastasios D.; Papaioannou, Agelos B.; Terzis, Aris (1994)
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Model Studies of the Interaction of Vanadium(III) and Oxovanadium(IV/V) with the Carbonyl Amide Oxygen
Soulti, K. D.; Troganis, Anastassios N.; Papaioannou, Agelos B.; Kabanos, Themistoklis A.; Keramidas, Anastasios D.; Deligiannakis, Yiannis G.; Raptopoulou, Catherine P.; Terzis, Aris (1998)a = 12.668(5) Å, b = 8.084(3) Å, c = 17.222(6) Å, α = 108.148(12)°
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Models of oxovanadium(IV)-protein interactions: The first oxovanadium(IV) complexes with dipeptides
Tasiopoulos, Anastasios J.; Vlahos, Antonis T.; Keramidas, Anastasios D.; Kabanos, Themistoklis A.; Deligiannakis, Yiannis G.; Raptopoulou, Catherine P.; Terzis, Aris (1996)
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Molybdenum(VI) coordination chemistry of the N,N-disubstituted bis(hydroxylamido)-1,3,5-triazine ligand, H2bihyat. Water-assisted activation of the MoVI=O bond and reversible dimerization of cis-[MoVIO2(bihyat)] to [MoVI2O 4(bihyat)2(H2O)2]
Stylianou, Marios; Nikolakis, Vladimiros A.; Chilas, G. I.; Jakusch, T.; Vaimakis, T.; Kiss, Tamás; Sigalas, Michael P.; Keramidas, Anastasios D.; Kabanos, Themistoklis A. (2012)Reaction of the N,N-disubstituted bis(hydroxylamino) ligand 2,6-bis[hydroxy(methyl)amino]-4-morpholino-1,3,5-triazine (H2bihyat) with cis-[MoVIO2(acac)2] in tetrahydrofuran resulted in isolation of the mononuclear compound ...
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Monolayer properties of surface-active metalorganic complexes with a tunable headgroup
Mallouri, R.; Keramidas, Anastasios D.; Brezesinski, G.; Leontidis, Epameinondas (2008)Surface-active metalorganic complexes can be used to construct organic thin films with excellent electronic and catalytic properties. We have recently introduced a new versatile surface-active ligand, which can efficiently ...
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NMR and theoretical investigations on the structures and dynamics of octahedral bis(chelate)dichloro VIII compounds isolated by an unusual reduction of non-oxo VIV species
Rikkou, Maria P.; Manos, Manolis J.; Tolis, Evangelos I.; Sigalas, Michael P.; Kabanos, Themistoklis A.; Keramidas, Anastasios D. (2003)Reaction of the non-oxo VIV species [VIVCl2(LOO)2] [LOO = acetylacetonate (acac-) or benzoylacetonate (bzac-)] with a chelate nitrogen-donor ligand LNN in acetonitrile leads to the reduction of VIV to VIII and the formation ...
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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- ...
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NMR investigation of the interaction of vanadate with carbasilatranes in aqueous solutions
Evgeniou, E. M.; Pergantis, S. A.; Leontidis, Epameinondas; Keramidas, Anastasios D. (2005)Reaction of vanadate with carbasilatranes [methoxy{N,N′,N″-2, 2′,3-[bis(1-methylethanolato)(propyl)]amino}silane (1), methoxy{N,N′,N″-2,2′,3-[bis(1-ethanolethanolato)(propyl)] amino}silane (2), and {N,N′,N″-2,2′,2-[bis(e ...
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On the importance of Pb⋯X (X = O, N, S, Br) tetrel bonding interactions in a series of tetra- and hexa-coordinated Pb(II) compounds
Seth, Saikat Kumar; Bauzá, Antonio; Mahmoudi, Ghodrat; Stilinović, Vladimir; López-Torres, Elena; Zaragoza, Guillermo; Keramidas, Anastasios D.; Frontera, Antonio (2018)Five new Pb(II) complexes of hydrazone-based and Schiff-based ligands and three different anionic co-ligands (azide, thiocyanate and bromide) have been synthesized and characterized by structural, analytical and spectroscopic ...
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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 ...
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Oxidovanadium(IV/V) complexes as new redox mediators in dye-sensitized solar cells: A combined experimental and theoretical study
Apostolopoulou, Andigoni; Vlasiou, Manolis; Tziouris, Petros A.; Tsiafoulis, Constantinos G.; Tsipis, Athanassios C.; Rehder, D.; Kabanos, Themistoklis A.; Keramidas, Anastasios D.; Stathatos, Elias (2015)Corrosiveness is one of the main drawbacks of using the iodide/triiodide redox couple in dye-sensitized solar cells (DSSCs). Alternative redox couples including transition metal complexes have been investigated where ...
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Oxovanadium(IV)-Amide Binding. Synthetic, Structural, and Physical Studies of {N-[2-(4-Oxopent-2-En-2-Ylamino)Phenyl]Pyridine-2-Carboxamido}Oxovanadium(IV) and {N-[2-(4-Phenyl-4-Oxobut-2-en-2-Ylamino)Phenyl]Pyridine-2-Carboxamido}Oxovanadium(IV)
Hanson, G.; Kabanos, Themistoklis A.; Keramidas, Anastasios D.; Mentzafos, D.; Terzis, Aris (1992)The complexes [VO(pycac)] and [VO(pycbac)] were prepared by the reaction of bis(pentane-2, 4-dionato)oxovanadium(IV) with either N-[2-(4-oxopent-2-en-2-ylamino)phenyl]pyridine-2-carboxamide (H2pycac) or 7V-[2-(4-phenylox ...
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Oxovanadium(IV)-sulfite compounds: Synthesis and structural and physical studies
Chilas, G. I.; Miras, Haralampos N.; Manos, Manolis J.; Woollins, J. D.; Slawin, A. M. Z.; Stylianou, Marios; Keramidas, Anastasios D.; Kabanos, Themistoklis A. (2005)Reaction of VIVOCl2 in strongly acidic aqueous solution with either (NH4)2SO3 or Na 2SO3 and Bu4NBr at ∼70 °C in the pH range 2.5-4.5 gives the clusters (NH4)2{[V 4IV)(μ4-O)2(μ3-OH) 2](VIVO)2(μ3-SO3) 4O4(H2O)2} and (n-Bu ...
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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) ...
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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 ...
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Polynuclear cobalt(II/III) sulfites: Synthesis, structure, and magnetic properties of the octanuclear cluster (NH4)11(Li⊂ [Co4IICo4III(SO3) 16(NH3)8])·10H2O encapsulating a lithium cation
Chilas, G. I.; Stylianou, Marios; Kubicki, Maciej; Vaimakis, T.; Kögerler, P.; Keramidas, Anastasios D.; Kabanos, Themistoklis A. (2008)Partial oxidation of an aqueous solution of CoIICl 2·6H2O with (NH4)6[Mo 7VIO24]·4H2O in the presence of (NH4)2SO3·H2O and LiCl, at pH ≈ 5.3, leads to isolation of the octanuclear cluster (NH 4)11(Li⊂[Co4IICo 4III(SO3)16(NH3) ...
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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 ...
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Recurrent supramolecular motifs in discrete complexes and coordination polymers based on mercury halides: prevalence of chelate ring stacking and substituent effects
Mahmoudi, Ghodrat; Zaręba, Jan K.; Bauzá, Antonio; Kubicki, Maciej; Bartyzel, Agata; Keramidas, Anastasios D.; Butusov, Leonid; Mirosław, Barbara; Frontera, Antonio (2018)In recent years, the crystal engineering library has been enriched with a number of previously unrecognized or unnoticed intermolecular interactions, such as agostic, tetrel, chalcogen, pnicogen bonding and chelate ring ...
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Six-co-ordinated vanadium-(IV) and -(V) complexes of benzimidazole and pyridyl containing ligands
Crans, D. C.; Keramidas, Anastasios D.; Amin, S. S.; Anderson, O. P.; Miller, S. M. (1997)A new series of vanadium-(IV) and -(V) complexes with ligands containing functionalities including hydroxyethyl, carboxylate, amine, pyridyl and benzimidazole have been prepared. The crystal structures of three complexes ...
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A Slow Exchanging Vanadium(V) Peptide Complex: Vanadium(V)-Glycine-Tyrosine
Crans, D. C.; Holst, H.; Keramidas, Anastasios D.; Render, D. (1995)The solution structure and rate of formation for a vanadium(V)-peptide complex, vanadium(V)-glycine-tyrosine (V-Gly-Tyr), is examined. Multinuclear NMR spectroscopic studies suggest the amide nitrogen is deprotonated and ...