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Келарев, В. И.; Silin, M. A.; Кобраков, К. И.; Rybina, I. I.; Korolev, V. K.

doi:10.1023/a:1025638910987

Cited by 6 publications

(3 citation statements)

References 5 publications

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“…1-Methyl-3-propyl-5-(4-fluorophenyl)-1 H -[1,2,4]triazole ( 6 ), 1-methyl-3-propyl-5-(2,4-difluorophenyl)-1 H -[1,2,4]triazole ( 7 ), and 1-methyl-3-propyl-5-(4-trifluoromethylphenyl)-1 H -[1,2,4]triazole ( 8 ) were similarly prepared from 2 , 3 , and 4 in overall yields of 62%, 74%, and 63%, respectively. The good yields of one regioisomer in the formation of 5 − 8 is due to the steric preference between the two amino groups of methylhydrazine in the final step . In addition to the required ligands, the 2-methyl-3-propyl-5-aryl-1 H -[1,2,4]triazole regioisomers were also generally formed in yields ranging from 5 to 20%, but these could be easily separated from the desired materials by column chromatography.…”

Section: Resultsmentioning

confidence: 99%

“…The good yields of one regioisomer in the formation of 5-8 is due to the steric preference between the two amino groups of methylhydrazine in the final step. 29 In addition to the required ligands, the 2-methyl-3-propyl-5-aryl-1H-[1,2,4]triazole regioisomers were also generally formed in yields ranging from 5 to 20%, but these could be easily separated from the desired materials by column chromatography. The different regioisomers were identified by 1 H NMR using the Nuclear Overhauser Effect (NOE).…”

Section: Resultsmentioning

confidence: 99%

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Blue Phosphorescence from Iridium(III) Complexes at Room Temperature

et al. 2006

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We report a new family of homoleptic iridium(III) complexes that emit blue phosphorescence at room temperature. The iridium(III) complexes are comprised of phenyltriazole ligands and were easily prepared via short synthetic routes. The parent fac-tris(1-methyl-5-phenyl-3-propyl-[1,2,4]triazolyl)iridium(III) complex exhibits blue photoluminescence (PL) with emission peaks at 449 and 479 nm and has a solution PL quantum yield of 66%. The emission was sequentially blue-shifted by the attachment of one and two fluorine atoms to the ligand phenyl ring with the fac-tris{1-methyl-5-(4,6-difluorophenyl)-3-propyl-[1,2,4]triazolyl}iridium(III) complex having the 1931 Commission Internationale de l'Eclairage coordinates of (0.16, 0.12) at room temperature. In contrast, when the phenyl ring of the ligands was substituted by trifluoromethyl, the PL spectrum was red-shifted when compared to the parent compound whereas if the trifluoromethyl group was attached to the triazole ring, the emission was blue-shifted. The radiative rates of these new blue iridium(III) complexes were found to be in the range of 2−6 × 105 s-1, indicating that the emission had varying amounts of metal-to-ligand charge-transfer character. Molecular orbital calculations showed that for the fluorinated complexes the contribution of the ligand triplet character to the emissive energy state increased with the hypsochromic shift in emission. This was confirmed by time-resolved PL measurements, which showed that the complex with the deepest blue emission had the slowest radiative decay rate.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Blue Phosphorescence from Iridium(III) Complexes at Room Temperature

et al. 2006

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“…The literature presents that the thiosemicarbazides form 1,3-thiazolidin-4-one through the reaction α-halogenated organic compounds (α-halogeno esters, α-halogeno acids, α-halogeno acid chlorides) [1][2][3][4][5][6][7]. Thiazolidin-4-ones are compounds with varied biological action: antibacterial, anticonvulsivante, anti-inflammatory, anti-HIV [6][7][8][9][10][11][12][13] etc.…”

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confidence: 99%

The Behaviour of Some Acylthiosemicarbazides in the Reaction with a-Halogenated Esters

Barbuceanu¹,

Almajan²,

Şaramet³

et al. 2008

Rev. Chim.

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New six unexpected 1,3,4-oxadiazoles were obtained starting from acylthiosemicarbazides. N1-[4-(4-X-phenylsulfonyl)benzoyl]-N4-(2/3-methoxyphenyl)-thiosemicarbazides 2,3a-c were treated with ethyl chloro- or bromoacetate in presence of anhydrous sodium acetate in order to obtain new thiazolidin-4-ones compounds. However, formation of desired thiazolidin-4-ones from these acylthiosemicarbazides failed and instead 1,3,4-oxadiazoles were obtained. For confirmation presence of these compounds, 5-[4-(phenylsulfonyl)phenyl]-2-(3-methoxyphenylamino)-1,3,4-oxadiazole 5a was synthetized by cyclodesulfurization of acylthiosemicarbazide 3a with mercury (II) acetate. The structures of these compounds were elucidated by FTIR, UV, 1H-NMR and 13C-NMR, MS spectra and elemental analysis.

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