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Statements

Subject Item
n2:RIV%2F62690094%3A18470%2F13%3A50001336%21RIV14-MSM-18470___
rdf:type
skos:Concept n3:Vysledek
dcterms:description
A series of six keto-hydrazone dyes was prepared by azo coupling of diazotised substituted 2- aminophenols with pyrrolinone esters. All keto-hydrazone compounds were found as a mixtures of E and Z isomers by 1H NMR. Irrespective to the position of nitro substituent on the phenol ring, all compounds fluoresce strongly only in solvent glass at 77 K except 4-nitro derivatives which also weakly fluoresce in solution and in solid-state at room temperature. Using these hydrazones as tridentate O-N-O´ ligands, six symmetrical 2:1 octahedral Co(III) complexes were prepared. Multinuclear NMR combined with 15N labelled hydrazone derivative proved that the starting mixture of hydrazone isomers was converted exclusively to E-azo configuration in complexes with coordinated nitrogen atoms coming solely from phenolic residues. The considerably different effect of 4- and 5-nitrophenol substituents on absorption spectra of the ligands and complexes was ascribed to prevailing azo character of an electronic structure of a ligand in the complex, based on TD DFT calculations. A series of six keto-hydrazone dyes was prepared by azo coupling of diazotised substituted 2- aminophenols with pyrrolinone esters. All keto-hydrazone compounds were found as a mixtures of E and Z isomers by 1H NMR. Irrespective to the position of nitro substituent on the phenol ring, all compounds fluoresce strongly only in solvent glass at 77 K except 4-nitro derivatives which also weakly fluoresce in solution and in solid-state at room temperature. Using these hydrazones as tridentate O-N-O´ ligands, six symmetrical 2:1 octahedral Co(III) complexes were prepared. Multinuclear NMR combined with 15N labelled hydrazone derivative proved that the starting mixture of hydrazone isomers was converted exclusively to E-azo configuration in complexes with coordinated nitrogen atoms coming solely from phenolic residues. The considerably different effect of 4- and 5-nitrophenol substituents on absorption spectra of the ligands and complexes was ascribed to prevailing azo character of an electronic structure of a ligand in the complex, based on TD DFT calculations.
dcterms:title
Synthesis and spectral properties of new hydrazone dyes and their Co(III) azo complexes Synthesis and spectral properties of new hydrazone dyes and their Co(III) azo complexes
skos:prefLabel
Synthesis and spectral properties of new hydrazone dyes and their Co(III) azo complexes Synthesis and spectral properties of new hydrazone dyes and their Co(III) azo complexes
skos:notation
RIV/62690094:18470/13:50001336!RIV14-MSM-18470___
n3:predkladatel
n4:orjk%3A18470
n6:aktivita
n8:P n8:N
n6:aktivity
N, P(EE2.3.30.0021)
n6:cisloPeriodika
3
n6:dodaniDat
n14:2014
n6:domaciTvurceVysledku
n12:7296126
n6:druhVysledku
n13:J
n6:duvernostUdaju
n20:S
n6:entitaPredkladatele
n19:predkladatel
n6:idSjednocenehoVysledku
109488
n6:idVysledku
RIV/62690094:18470/13:50001336
n6:jazykVysledku
n11:eng
n6:klicovaSlova
DFT; fluorescence spectra; absorption spectra; metal-azo komplex; pyrrolinone; Hydrazone
n6:klicoveSlovo
n7:pyrrolinone n7:fluorescence%20spectra n7:Hydrazone n7:absorption%20spectra n7:DFT n7:metal-azo%20komplex
n6:kodStatuVydavatele
NL - Nizozemsko
n6:kontrolniKodProRIV
[259E56E5B00A]
n6:nazevZdroje
Dyes and pigments
n6:obor
n15:CF
n6:pocetDomacichTvurcuVysledku
1
n6:pocetTvurcuVysledku
6
n6:projekt
n9:EE2.3.30.0021
n6:rokUplatneniVysledku
n14:2013
n6:svazekPeriodika
98
n6:tvurceVysledku
Mervat, Elsedik Oldřich, Machalický Lyčka, Antonín Stanislav, Luňák Radim, Hrdina Tarek, Aysha
n6:wos
000321169000031
s:issn
0143-7208
s:numberOfPages
10
n16:doi
10.1016/j.dyepig.2013.04.012
n17:organizacniJednotka
18470