Browsing by Author "Bulhac, Ion"

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    AGENȚI DE COORDINARE DE TIP BAZE SCHIFF – SURSE GENERATIVE DE EMISIE
    (CEP USM, 2024) Danilescu, Olga; Culicova, Olga; Cocu, Maria; Bulhac, Ion
    This work elucidates the structure-property correlation and comparative study of the photoluminescent activity of three lumonophore Schiff base coordination agents H2L1, H2L2 and H2L3 (H2L1 = 2,6-diacetylpyridine bis(isonicotinoylhydrazone), H2L2 = 2,6-diacetylpyridine bis(nicotinoylhydrazone) and H2L3 = 2,6-diacetylpyridine bis(picolinoylhydrazone)) and their precursors. The fluorescent emissions of both the starting substances and the coordination agents show emission bands in the blue region (500-550 nm). The comparative study of the photoluminescent activity shows a 100-fold increase in the luminescence intensity of the coordination agents H2L1 and H2L2 compared to that of their precursors, and the coordination agent H2L3 showed a 50-fold increase in luminescence intensity compared to that of the starting substances.
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    COORDINATION CHEMISTRY IN THE REPUBLIC OF MOLDOVA
    (2009) Bulhac, Ion; Gulea, Aurelian; Batâr, Dumitru
    This article is dedicated to the history of apparition and development of Coordination chemistry in Moldova. The main scientific centres are characterized, as well as their main research directions. The most valuable results in fundamental and applicative research are described, obtained in the field of coordination chemistry in the republic.
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    COORDINATION CHEMISTRY IN THE REPUBLIC OF MOLDOVA
    (Institute of Chemistry of ASM, 2009) Bulhac, Ion; Gulea, Aurelian; Batâr, Dumitru
    This articleis dedicated to the history of apparition and development of Coordination chemistry in Moldova. The main scientifi c centres are characterized, as well as their main research directions. The most valuable results in fundamental and applicative research are described, obtained in the fi eld of coordination chemistry in the republic.
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    COORDINATION COMPOUNDS AND CHEMICAL COMPOSITIONS WITH ANTIOXIDANT PROPERTIES
    (2023) Bulhac, Ion; Ștefîrță, Anastasia; Brînză, Lilia; Coropceanu, Eduard; Voloșciuc, Leonid; Cocu, Maria
    In the paper are presented the main results that argue the antioxidant effect of BACC and some chemical compositions on plants. The anti-stress action of the new preparations - Conimid, Difecoden, Fludisec, Polyel, Galmet and Thiogalmet, is provided by increasing the antioxidant protection capacity due to the decrease of the content of malondialdehyde, intensification of the activity of antioxidant enzymes, increase in the content of non-enzymatic antioxidants with low molecular mass. The possibilities of optimizing the resistance of plants to oxidative stress, caused by drought, and stabilization of plant productivity are promising. The biological performance of plants pre-treated with BACC and antioxidant preparations are more fully realized under both optimal moisture and moderate drought conditions.
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    INFLUENCE OF SOME COORDINATION COMPOUNDS WITH POLYDENTATE LIGANDS ON THE PROTEOLYTIC ACTIVITY OF FUSARIUM GIBBOSUM CNMN FD 12
    (CEP USM, 2022-09-29) Ciloci, Alexandra; Clapco, Stetlana; Labliuc, Svetlana; Bulhac, Ion; Ureche, Dumitru; Dvornina, Elena
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    SINTEZA POLIMERULUI COORDINATIV HETEROMETALIC Mn(II)/Cd(II), STUDIUL STRUCTURAL ȘI AL FOTOLUMINESCENȚEI
    (CEP USM, 2024) Danilescu, Olga; Croitor, Lilia; Bouroș, Polina; Kulikova, Olga; Cocu, Maria; Bulhac, Ion; Chumakov, Iurie
    Based on solvothermal synthesis, self-assembly of the heptadentate 2,6-diacetylpyridine bis(nicotinoylhydrazone) schiff base ligand (H2l) and Mn(II) and Cd(II) salts has led to formation a heterometallic {[Mn0.3Cd0.7l]·dmf·0.25H2O}n (1) coordination polymer. This compound was characterized by IR spectroscopy, single-crystal X-ray diffraction, as well as the photoluminescente proprietes were studied.
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    SINTEZA ȘI CARACTERIZAREA COMPUȘILOR COMPLECȘI AI Co(II) ȘI Mn(II) CU LIGAND N,N-HETEROCICLIC
    (CEP USM, 2024) Cuba, Lidia; Bulhac, Ion; Bouroş, Paulina
    Some coordination compounds of cobalt(II) and manganese(II) and N,N-heterocyclic ligand phthalazine are described. Complexes were obtained by the interaction of o-phthalaldehyde (DF), isoniazid (INh) and Co(NCS)2·3H2O or Mn(CCl3COO)2 (1:2:1), are studied by elemental analysis and IR spectroscopy. The molecular structure of Mn(II) complex has been determined by single crystal X-ray diffracton analysis.
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    SINTEZA ŞI STRUCTURA COMPUŞILOR DE VANADIU CU BAZE SCHIFF PENTADENTATE
    (CEP USM, 2014) Mîrzac, Alexandra; Bouroş, Pavlina; Bulhac, Ion; Nicorici, Valentina
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    SINTEZA, STUDIUL PROPRIETĂȚILOR ȘI ARHITECTURII MOLECULARE ALE COMPUȘILOR COORDINATIVI AI METALELOR DE TIP „s” ȘI „d” CU LIGANZI POLIFUNCȚIONALI
    (2023) Ureche, Dumitru; Bulhac, Ion; Bouroș, Pavlina
    Scopul lucrării constă în crearea noilor proliganzi și a compușilor coordinativi mono- și polinucleari, inclusiv polimerici, ai metalelor „s” și „d” cu liganzi homo- și heterofuncționali, caracterizarea lor, precum și studiul activității biologice a acestora.