Browsing by Author "Constantinides, Christos P."
Now showing items 21-30 of 30
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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, J. M.; Koutentis, Panayiotis Andreas (2014)A two-step route to 1,3-disubstituted benzo- and pyrido-fused 1,2,4-triazinyl radicals is presented. The route involves the N′-(2-nitroarylation) of easily prepared N′-(het)arylhydrazides via nucleophilic aromatic substitution ...
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Article
Spectroscopic characterization of C-4 substituted 3,5-dichloro-4H-1,2,6-thiadiazines
Theodorou, E.; Ioannidou, Heraklidia A.; Ioannou, Theodosia A.; Kalogirou, Andreas S.; Constantinides, Christos P.; Manoli, Maria; Koutentis, Panayiotis Andreas; Hayes, Sophia C. (2015)Three 3,5-dichloro-4H-1,2,6-thiadiazines, which differ according to the electron withdrawing nature of their substituent at C-4: (a) 3,5-dichloro-4-methylene-4H-1,2,6-thiadiazine (5a), (b) 3,5-dichloro-4H-1,2,6-thiadiazin-4-one ...
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Spectroscopic characterization of C-4 substituted 3,5-dichloro-4H-1,2,6-thiadiazines1
Theodorou, Eleni; Ioannidou, Heraklidia A.; Ioannou, Theodosia A.; Kalogirou, Andreas S.; Constantinides, Christos P.; Manoli, Maria; Koutentis, Panayiotis Andreas; Hayes, Sophia C. (2015)
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Article
Spin-triplet excitons in 1,3-diphenyl-7-(fur-2-yl)-1,4-dihydro-1,2,4- benzotriazin-4-yl
Constantinides, Christos P.; Carter, E.; Murphy, D. M.; Manoli, Maria; Leitus, G. M.; Bendikov, M.; Rawson, J. M.; Koutentis, Panayiotis Andreas (2013)7-(Fur-2-yl)benzotriazinyl 1 is the first example of a hydrazyl radical dimer with a thermally accessible triplet state. The triplet exciton (|D| = 0.018 cm-1, |E| = 0.001 cm-1) was observed by solid-state VT-EPR spectroscopy ...
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Article
Stable N- and N/S-Rich Heterocyclic Radicals: Synthesis and Applications
Constantinides, Christos P.; Koutentis, Panayiotis Andreas (2016)Over the last few decades the number of stable heterocyclic neutral radicals has dramatically increased. There have been significant efforts to use these unusual open-shell compounds in a broad array of applications that ...
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Structural, magnetic, and computational correlations of some imidazolo-fused 1,2,4-benzotriazinyl radicals
Constantinides, Christos P.; Berezin, Andrey A.; Manoli, Maria; Leitus, G. M.; Zissimou, Georgia A.; Bendikov, M.; Rawson, J. M.; Koutentis, Panayiotis Andreas (2014)1,3,7,8-Tetraphenyl-4,8-dihydro-1H-imidazolo[4,5g][1,2,4]benzotriazin-4-yl (5), 8-(4-bromophenyl)-1,3,7-triphenyl-4,8-dihydro-1H-imidazolo[4,5g][1,2,4] benzotriazin-4-yl (6), and 8-(4-methoxyphenyl)-1,3,7-triphenyl-4,8-dihydro-1H- ...
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Article
The suppression of columnar π-stacking in 3-adamantyl-1-phenyl-1,4-dihydrobenzo[e][1,2,4]triazin-4-yl
Constantinides, Christos P.; Berezin, Andrey A.; Zissimou, Georgia A.; Manoli, Maria; Leitus, G. M.; Koutentis, Panayiotis Andreas (2016)3-Adamantyl-1-phenyl-1,4-dihydrobenzo[e][1,2,4]triazin-4-yl(4) crystallizes as chains of radicals where the spin bearing benzotriazinyl moieties are isolated from each other. Magnetic susceptibility studies in the 5-300 K ...
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Synthesis and properties of imidazolo-fused benzotriazinyl radicals
Berezin, Andrey A.; Constantinides, Christos P.; Mirallai, Styliana I.; Manoli, Maria; Cao, Levy L.; Rawson, J. M.; Koutentis, Panayiotis Andreas (2013)1,3-Diphenylbenzo[e][1,2,4]triazin-7(1H)-one, the oxidation product of 1,3-diphenyl-1,4-dihydro-1,2,4-benzotriazin-4-yl (Blatter's radical), reacts with N′-arylbenzamidines in PhMe at ca. 100 °C in the presence of ...
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Synthesis of 7-aryl/heteraryl-1,3-diphenyl-1,2,4-benzotriazinyls via palladium catalyzed Stille and Suzuki-Miyaura reactions
Constantinides, Christos P.; Koutentis, Panayiotis Andreas; Loizou, G. (2011)Stille and Suzuki-Miyaura reactions of 7-iodo-1,3-diphenyl-1,4-dihydro-1,2, 4-benzotriazin-4-yl are presented as rare examples of cross-coupling reactions with stable organic radicals. Both the Stille and Suzuki-Miyaura ...
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Article
Tetraphenylhexaazaanthracenes: 16π Weakly Antiaromatic Species with Singlet Ground States
Constantinides, Christos P.; Zissimou, Georgia A.; Berezin, Andrey A.; Ioannou, Theodosia A.; Manoli, Maria; Tsokkou, Demetra; Theodorou, E.; Hayes, Sophia C.; Koutentis, Panayiotis Andreas (2015)Tetraphenylhexaazaanthracene, TPHA-1, is a fluorescent zwitterionic biscyanine with a closed-shell singlet ground state. TPHA-1 overcomes its weak 16π antiaromaticity by partitioning its π system into 6π positive and 10π ...