Browsing by Author "Popuşoi, Ana"

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    DERIVAȚI CALCONICI CU GRUPA 4-(DIMETILAMINO)FENIL ÎN APLICAȚII FOTOVOLTAICE
    (CEP USM, 2024) Popuşoi, Ana; Potlog, Tamara; Robu, Ştefan; Jora, Elena
    In this paper, dye-sensitized solar cells (DSSCs) are fabricated and studied using chalconic derivatives as sensitizing dyes. The chalconic derivatives containing the 4-N,N-dimethyl group present two absorption bands with maxima located at the 241 nm and 416 nm, with maximum intensity in the visible region and absorption coefficient of the order 104 cm-1. The analysis of the current-voltage characteristics of the DSSCs with the respective chalconic derivative indicattes the best solar energy conversion efficiency (η = 0.4%), due to the fact that it has the highest absorption value in the band located in the visible region. The best short-circuits current density with value of 2.45 mA/cm2. are obtained for the DSSCs sensitized with chalconic derivative containing 4-N, N-dimethyl SH group.
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    METALOFTALOCIANINE SOLUBILE ÎN APĂ DIN COPOLIMERI DE N-VINILPIROLIDONĂ CU CLORURĂ DE ACRILOIL
    (CEP USM, 2020) Popuşoi, Ana; Robu, Ştefan; Tiuleanu, Pavel; Dragalina, Galina; Potlog, Tamara
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    OPTIMIZAREA SINTEZEI UNOR MONOMERI CARBAZOLICI
    (CEP USM, 2019) Dragalina, Galina; Robu, Ştefan; Popuşoi, Ana; Potlog, Tamara
    Studiul de faţă vizează sinteza unor monomeri carbazolici în scopul utilizării lorla producerea materialelor fototermo plastice. În acest scop, carbazolul a fost tratat cu aldehidă formică (sub formă deparaform), ceea ce a permis asintetiza N-hidroxim etilcarbazolul (ca produs de bază), care, prin tratare cu clorură de acriloil,a contribuit la formarea, cu randament înalt,a monomerului corespunzător –carbazolilmetilacrilat.
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    SINTEZA ȘI CERCETAREA FTALOCIANINELOR DE ZN SUBSTITUITE CU GRUPĂRI NITRO ȘI AMINO
    (CEP USM, 2022-11-10) Popuşoi, Ana; Lungu, Ion; Rusnac, Roman; Bulmaga, Petru; Robu, Ştefan; Potlog, Tamara
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    SINTEZA ŞI STUDIUL UNOR POLIMERI CARBAZOLICI FOTOLUMINESCENŢI GREFAŢI CU COLORANŢI METALOFTALOCIANINICI
    (CEP USM, 2013-09-26) Robu, Ştefan; Popuşoi, Ana; Dragalina, Galina; Culeac, Ion; Popuşoi, Mihail
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    SUBSTITUTED 1,3-PHENYL(PYRIDYL) PROPENONES AND DERIVATIVES WITH THIOSEMICARBAZIDIC GROUPS. STRUCTRURE – (HL-60) ANTILEUKEMIA ACTIVITY RELATIONSHI
    (Institute of Chemistry of ASM, 2014) Popuşoi, Ana; Barba, Nicanor; Gulea, Aurelian; Roy, Jenny; Poirier, Donald
    3-(4-(Dimethylamino)phenyl-1-(4-isothiocyanatophenyl)prop-2-en-1-one was obtained from the corresponding N,N-dimethylthyoureas by elimination of dimethylamine at heating with gaseous hydrogen chloride in chloroform and 1-(4-isothiocyanatophenyl)-3-(pyridin-2-il)prop-2-en-1-one by treating 1,1-dimethyl-3-(4-(3-(pyridin-2-il)-acryloyl)-phenyl)thyourea with acetic anhydride. The difference in the reactivity of the groups >C=O and NCS in the synthesis with hydrazine hydrate and its derivatives allows the synthesis of some 1,3-disubstituted propenones with thiosemicarbazide groups (4- and 1,4-disubstituted) in good yields. From 4-substituted thiosemicarbazides and 2-formilpyridine thiosemicarbazones were obtained. In the case of some derivatives, the propenone group in the reaction with hydrazine hydrate allows the formation of pyrazole derivatives. All obtained compounds were investigated for antileukemia activity. It was found that this activity is more pronounced for thiosemicarbazide derivatives with two pyridine nuclei at concentrations 10-5-10-7 mol/L.