Browsing by Author "Constantinides, Christos P."
Now showing items 1-20 of 30
-
Book Chapter
1,3,4-Thiadiazoles
Koutentis, Panayiotis Andreas; Constantinides, Christos P. (Elsevier Ltd., 2008)
-
Article
Antiferromagnetic interactions in 1D Heisenberg linear chains of 7-(4-fluorophenyl) and 7-phenyl-substituted 1,3-diphenyl-1,4-dihydro- 1,2,4-benzotriazin-4-yl radicals
Constantinides, Christos P.; Koutentis, Panayiotis Andreas; Rawson, J. M. (2012)7-(4-Fluorophenyl) and 7-phenyl-substituted 1,3-diphenyl-1,4-dihydro-1,2,4- benzotriazin-4-yl radicals were characterized by X-ray diffraction analysis and variable-temperature magnetic susceptibility studies. The radicals ...
-
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
ChemInform Abstract: Route to Benzo‐ and Pyrido‐Fused 1,2,4‐Triazinyl Radicals via N′‐(Het)aryl‐N′‐2‐nitro(het)aryl]hydrazides.
Berezin, Andrey A.; Zissimou, Georgia A.; Constantinides, Christos P.; Beldjoudi, Yassine; Rawson, Jeremy M.; Koutentis, Panayiotis Andreas (2014)
-
Article
ChemInform Abstract: Synthesis and Properties of Imidazolo‐Fused Benzotriazinyl Radicals.
Berezin, Andrey A.; Constantinides, Christos P.; Mirallai, Styliana I.; Manoli, Maria; Cao, Levy L.; Rawson, Jeremy M.; Koutentis, Panayiotis Andreas (2014)
-
Article
A DFT study of the ground state multiplicities of linear vs angular polyheteroacenes
Constantinides, Christos P.; Koutentis, Panayiotis Andreas; Schatz, J. (2004)Unrestricted density functional calculations in combination with the broken-symmetry approach and spin-projection methods have been employed to study a series of formally 4n π antiaromatic linear and angular polyheteroacenes. ...
-
Article
Effective exchange coupling in alternating-chains of a π-extended 1,2,4-benzotriazin-4-yl
Constantinides, Christos P.; Berezin, Andrey A.; Manoli, Maria; Leitus, G. M.; Bendikov, M.; Rawson, J. M.; Koutentis, Panayiotis Andreas (2014)Air stable 1,3,7-triphenyl-1,4-dihydrothiazolo[5′,4′:4,5] benzo[1,2-e][1,2,4]triazin-4-yl packs in 1D π stacks made of radical pairs with alternate short and long interplanar distances. The magnetic susceptibility exhibits ...
-
Article
Emission from the stable Blatter radical
Karecla, G.; Papagiorgis, Panagiotis; Panagi, N.; Zissimou, Georgia A.; Constantinides, Christos P.; Koutentis, Panayiotis Andreas; Itskos, Grigorios; Hayes, Sophia C. (2017)1,3-Diaryl-1,4-dihydro-1,2,4-benzotriazin-4-yls are air stable organic radicals which have been exploited for their interesting magnetic properties. Herein, we present the optical properties of the "parent" radical namely ...
-
Article
Emission from the stable Blatter radicalAAA
Karecla, G.; Papagiorgis, Panagiotis; Panagi, N.; Zissimou, Georgia A.; Constantinides, Christos P.; Koutentis, Panayiotis Andreas; Itskos, Grigorios; Hayes, Sophia C. (2017)1,3-Diaryl-1,4-dihydro-1,2,4-benzotriazin-4-yls are air stable organic radicals which have been exploited for their interesting magnetic properties. Herein, we present the optical properties of the "parent" radical namely ...
-
Article
Erratum: Route to Benzo- and Pyrido-Fused 1,2,4-Triazinyl Radicals via N′-(Het)aryl-N′-[2-nitro(het)aryl]hydrazides (J. Org. Chem. (2014) 79:1 (314-327) DOI: 10.1021/jo402481t)
Berezin, Andrey A.; Zissimou, Georgia A.; Constantinides, Christos P.; Beldjoudi, Yassine; Rawson, J. M.; Koutentis, Panayiotis Andreas (2015)
-
Article
Erratum: Synthesis and properties of imidazolo-fused benzotriazinyl radicals (Organic & Biomolecular Chemistry (2013) 11 (6780-6795) DOI:10.1039/c3ob41169a)
Berezin, Andrey A.; Constantinides, Christos P.; Mirallai, Styliana I.; Manoli, Maria; Cao, Levy L.; Rawson, J. M.; Koutentis, Panayiotis Andreas (2014)
-
Article
Erratum: Tetraphenylhexaazaanthracenes: 16π Weakly Antiaromatic Species with Singlet Ground States (Org. Lett. (2015) 17 (4026-4029) DOI: 10.1021/acs.orglett.5b01923)
Constantinides, Christos P.; Zissimou, Georgia A.; Berezin, Andrey A.; Ioannou, Theodosia A.; Manoli, Maria; Tsokkou, Demetra; Theodorou, E.; Hayes, Sophia C.; Koutentis, Panayiotis Andreas (2016)
-
Article
Ferromagnetic interactions in a 1d alternating linear chain of π-stacked 1,3-diphenyl-7-(thien-2-yl)-1,4-dihydro-1,2,4-benzotriazin-4-yl radicals
Constantinides, Christos P.; Koutentis, Panayiotis Andreas; Rawson, J. M. (2012)X-ray studies show that 1,3-diphenyl-7-(thien-2-yl)-1,4-dihydro-1,2,4- benzotriazin-4-yl (6) adopts a distorted, slipped π-stacked structure of centrosymmetric dimers with alternate short and long interplanar distances ...
-
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
A magnetostructural investigation of an abrupt spin transition for 1-phenyl-3-trifluoromethyl-1,4-dihydrobenzo[e][1,2,4]triazin-4-yl
Constantinides, Christos P.; Berezin, Andrey A.; Zissimou, Georgia A.; Manoli, Maria; Leitus, G. M.; Bendikov, M.; Probert, M. R.; Rawson, J. M.; Koutentis, Panayiotis Andreas (2014)1-Phenyl-3-trifluoromethyl-1,4-dihydrobenzo[e][1,2,4]triazin-4-yl is the first example of a hydrazyl radical that shows a reversible sharp spin transition fully completed within 5(1) K. The nominally first-order transition ...
-
Article
Manipulating the singlet-triplet energy gaps of arene-fused bis(1,2,3-dithiazoles): A computational study
Constantinides, Christos P.; Ioannou, Theodosia A.; Koutentis, Panayiotis Andreas (2013)Benzo- and azino-fused bis(1,2,3-dithiazoles) were investigated computationally using density functional theory (DFT) in an attempt to relate structure to ground state multiplicity preference. Structural changes on the ...
-
Article
Oxidation of Tetraphenylhexaazaanthracene: Accessing a Scissor Dimer of a 16π Biscyanine
Zissimou, Georgia A.; Constantinides, Christos P.; Manoli, Maria; Pieridou, Galatia K.; Hayes, Sophia C.; Koutentis, Panayiotis Andreas (2016)Tetraphenylhexaazaanthracene (TPHA), a fluorescent zwitterionic biscyanine with a closed-shell singlet ground state, on treatment with manganese dioxide or phenyliodine bis(trifluoroacetate) (PIFA), undergoes oxidative ...
-
Article
Preparation of Blatter Radicals via Aza-Wittig Chemistry: The Reaction of N-Aryliminophosphoranes with 1-(Het)aroyl-2-aryldiazenes
Savva, Anastasia C.; Mirallai, Styliana I.; Zissimou, Georgia A.; Berezin, Andrey A.; Demetriades, Marina; Kourtellaris, Andreas; Constantinides, Christos P.; Nicolaides, C.; Trypiniotis, Theodossis; Koutentis, Panayiotis Andreas (2017)Reacting N-aryliminophosphoranes with 1-(het)aroyl-2-aryldiazenes in preheated diphenyl ether at ca. 150-250 °C for 5-25 min affords in most cases the 1,3-diaryl-1,4-dihydrobenzo[e][1,2,4]triazin-4-yls (aka Blatter radicals) ...
-
Article
Preparation of Blatter Radicals via Aza-Wittig Chemistry: The Reaction of N-Aryliminophosphoranes with 1-(Het)aroyl-2-aryldiazenesAAA
Savva, Anastasia C.; Mirallai, Styliana I.; Zissimou, Georgia A.; Berezin, Andrey A.; Demetriades, Marina; Kourtellaris, Andreas; Constantinides, Christos P.; Nicolaides, C.; Trypiniotis, Theodossis; Koutentis, Panayiotis Andreas (2017)Reacting N-aryliminophosphoranes with 1-(het)aroyl-2-aryldiazenes in preheated diphenyl ether at ca. 150-250 °C for 5-25 min affords in most cases the 1,3-diaryl-1,4-dihydrobenzo[e][1,2,4]triazin-4-yls (aka Blatter radicals) ...
-
Article
Resonance Raman investigation of β-cyclodextrin-encapsulated π-conjugated polymers
Kasiouli, S.; Di Stasio, F.; McDonnell, S. O.; Constantinides, Christos P.; Anderson, H. L.; Cacialli, F.; Hayes, Sophia C. (2013)Resonance Raman (RR) spectroscopy is used to investigate the effect of β-cyclodextrin encapsulation on the structural and photophysical properties of poly(4,4′-diphenylenevinylene). We especially focus on the thermal ...