Zobrazeno 1 - 10
of 66
pro vyhledávání: '"Vassil B. Delchev"'
Publikováno v:
Molecules, Vol 29, Iss 18, p 4511 (2024)
The hydrophobic reagent 6-hexyl-4-(2-thiazolylazo)resorcinol (HTAR) was investigated as part of a cloud-point extraction (CPE) system for the spectrophotometric determination of Zn(II). In the system, complexes with different stoichiometries, includi
Externí odkaz:
https://doaj.org/article/a5b01eb2e1424479affaec9ce2a64b0f
Autor:
Vidka V. Divarova, Antoaneta Saravanska, Galya Toncheva, Nikolina Milcheva, Vassil B. Delchev, Kiril Gavazov
Publikováno v:
Molecules, Vol 27, Iss 4, p 1217 (2022)
A new liquid—liquid extraction system for molybdenum(VI) was studied. It contains 4-nitrocatechol (4NC) as a complexing chromogenic reagent and benzalkonium chloride (BZC) as a source of heavy cations (BZ+), which are prone to form chloroform-extra
Externí odkaz:
https://doaj.org/article/b7e78cec3eaf49108f9a95e337ba3d18
Publikováno v:
Acta Chimica Slovenica, Vol 65, Iss 2, Pp 462-469 (2018)
Liquid-liquid extraction systems for VIV/V containing 2,3-dihydroxynaphtahlene (DN) and 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl-2H-tetrazolium bromide (thiazolyl blue, MTT) were studied. The optimum conditions for VIV and VV extraction were found.
Externí odkaz:
https://doaj.org/article/99cf2882fa0e4ffe93a95a7042ddc543
Autor:
Vassil B. Delchev
Publikováno v:
Journal of Molecular Modeling. 27
Two tautomers of melamine (triamino and imino-diamino) were studied at the BLYP/aug-cc-pVDZ theoretical level. It was found that the two tautomers are bridged with the 1πσ* excited-state reaction path. The high photostability of melamine in water s
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::79af8c1ee4d5898459be22c48e1f8d2c
https://doi.org/10.1007/s00894-021-04809-x
https://doi.org/10.1007/s00894-021-04809-x
Publikováno v:
Open Chemistry, Vol 17, Iss 1, Pp 599-608 (2019)
The azo dye 4-(2-thiazolylazo)orcinol (TAO) and the cationic ion-pair reagent 2,3,5-triphenyl-2H-tetrazolium chloride (TTC) were examined as constituents of a water-chloroform extraction-chromogenic system for vanadium(IV). The effects of TAO concent
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f284fa715fa77e88ff1f0fc6027d6326
https://doi.org/10.1515/chem-2019-0071
https://doi.org/10.1515/chem-2019-0071
Publikováno v:
Journal of Structural Chemistry. 60:898-908
We have carried out a combined theoretical (at the TDDFT BLYP/6-311++G** level of theory) and experimental study of the mechanism of phototautmerization of the N(3)H oxo tautomer of isocytosine dissolved in a water medium. The study reveals that this
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7e030e271aa660be9f64d84fb04c6953
https://doi.org/10.1134/s0022476619060040
https://doi.org/10.1134/s0022476619060040
Publikováno v:
Croatica Chemica Acta
Volume 93
Issue 2
Volume 93
Issue 2
The imino tautomers of isocytosine were objects of investigation at the TD-DFT level of theory - TD BLYP/6-311++G(d,p). We studied the mechanisms of the H1-N detachment in these tautomers through excited-state reaction paths. It was proposed that the
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8f0a793f88bc6b9961d1d8f0f2b652e5
https://doi.org/10.5562/cca3659
https://doi.org/10.5562/cca3659
Autor:
Vassil B. Delchev
Publikováno v:
Croatica Chemica Acta
Volume 93
Issue 3
Volume 93
Issue 3
The compound 6,6’-dibromoindigo, which is the main component of the pigment Tyrian purple, was studied theoretically at the TD-DFT level of theory. We found that the absorption maximum of the compound about 600 nm underwent a red-shift when moving
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::02b01a57cbda4a7e58428da5636e9818
https://hrcak.srce.hr/file/371289
https://hrcak.srce.hr/file/371289
Publikováno v:
Chemical Physics. 515:663-671
The irradiation of water solution of 6-azauracil showed that one of the photoreactions is the phototautomerization of the oxo tautomer of the compound into the hydroxy tautomer. The photoreaction was identified by a thorough analysis of experimentall
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::93a3e2f621bb8fdddb0881497c6ba363
https://doi.org/10.1016/j.chemphys.2018.07.022
https://doi.org/10.1016/j.chemphys.2018.07.022