Facultatea de Chimie şi Tehnologie Chimică / Faculty of Chemistry and Chemical Technology
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Item Coordination compounds of cobalt, nickel, copper, and zinc with N 1,N 2-bis (pyridin-2-ylmethylidene)benzene-1,2-diamine and its derivatives [Articol](2014) Pahonțu, Elena; Gulea, Aurelian; Poirier, Donald; Țapcov, Victoro-Phenylenediamine reacts with 2-formyl-, 2-acetyl-, or 2-benzoylpyridine in ethanol in the presence of cobalt, nickel, copper, or zinc chlorides to form monomeric complexes ML1-3Cl2·nH2O {M = Co, Ni, Cu, Zn; L1 = N 1,N 2-bis(pyridin-2-ymethylidene)benzene-1,2-diamine, L2 = N 1,N 2-bis(pyridin-2-ylethylidene) benzene-1,2-diamine, L3 = N 1,N 2-bis[phenyl(pyridin-2-yl)methylidene]benzene-1,2-diamine; n = 0-3}. The condensation products (L1-L3) act in the complexes as tetradentate N,N,N,N-ligands. Thermolysis of the complexes occurs in two stages: dehydration (70-95°C) and complete degradation (320-450°C). At concentrations of 10-5-10-7 M, the complexes inhibit in vitro growth and proliferation of HL-60 human promyelocytic leukemia cells.Item Coordination chemistry in the Republic of Moldova [Articol](2009) Bulhac, Ion; Gulea, Aurelian; Batâr, DumitruThis 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.Item Synthesis and antimicrobial activity of coordination compounds of copper with substituted salicylaldehyde thiosemicarbazones [Articol](Springer, 2005) Prisakar, V. I.; Tsapkov, V. I.; Buracheeva, S.A.; Byrke, M.S.; Gulya, A. P.New coordination compounds of copper(II) with thiosemicarbazones of 5-chloro-, 5-bromo-, 5-nitro-, 5-methyl-, 3,5-dichloro-, and 3,5-dibromo-substituted salicylaldehyde have been synthesized and tested with respect to eight strains of staphyloccoccus, streptococcus, and colon bacillus. These compounds exhibit high antimicrobial activity. The composition and structure of the synthesized complexes have been studied by means of elemental analysis and by magnetochemical, IR, and thermogravimetric techniques. The antimicrobial activity of the obtained coordination compounds depends both on the nature of substituents in the benzene ring of salicylaldehyde and on the nature of acid ligands. The maximum antimicrobial activity was observed for copper(II) complexes with thiosemicarbazone of 3,5-dibromsalicyladehyde.Item Sinteza şi structura compuşilor coordinativi ai cuprului(II) cu tiosemicarbazona aldehidei 5-(metilentrimetilamoniu)salicilice [Articol](CEP USM, 2016) Sîrbu, Angela; Secu, Mihail; Bouroș, Polina; Palamarciuc, OlegA fost sintetizată clorura tiosemicarbazonei aldehidei 5-(metilentrimetilamoniu)salicilice în formă de sare ((H2L)Cl•1.5H2O), iar la interacţiunea acesteia cu diferite săruri de cupru(II) în mediu neutru au fost obţinuţi patru compuşi cu formulele [Cu(HL)Cl]Cl•2.25H2O (1), Cu(HL)(Cl)(NO3)]•2H2O (2), [Cu(H2L)Cl]SO4•0.75H2O (3) şi [Cu(HL)Cl]ClO4•1.75H2O (4), ce au fost stabilite cu ajutorul razelor X. Trei compuşi ai cuprului sunt compuşi ionici, formaţi din cationul complex [Cu(HL)Cl]+ori [Cu(H2L)Cl]2+, anionii fiind Cl-, ClO4- şi SO42- respectiv, iar compusul ce conţine anionul NO3-este un complex molecular. Toţi compuşii conţin molecule de apă de solvatare. Liganzii (HL)0/(H2L)+în 1, 2, 4/3coordinează tridentat prin setul de atomi donori O,N,S în formă de ion bipolar, singur fiind electroneutru, însă conţinând două centre ionice (Zwitter-ion) ori în forma sa protonată, respectiv. Raportul molar de combinare Cu:(HL)0/(H2L)+în aceşti compuşi este 1:1. În rezultatul coordinării liganzii organici (HL)0/(H2L)+suferă schimbări conformaţionale, iar primii sunt supu şi monodeprotonării.Item Sinteza, structura şi proprietăţile compuşilor coordinativi ai fierului cu 4-Feniltiosemicarbazona şi 4-Fenil-s-metiltiosemicarbazona 2-Acetilpiridinei [Articol](CEP USM, 2016) Palamarciuc, Tatiana; Sîrbu, Angela; Palamarciuc, OlegÎn acest articol este realizată sinteza compuşilor Fe(III) cu 4-feniltiosemicarbazona şi 4-fenil-S-metiltiosemicarbazona 2-acetilpiridinei, fiind propus studiul cristalografic şi magnetic al acestor compuşi cât şi studiul spectrofotometric în soluţie pentru ionii Fe(II) cu aceiaşi liganzi. Compuşii coordinativi [Fe(L1)2]BF4•CH3OH (1) şi [Fe(L2)2]FeCl4(2) au fost obţinuţi în soluţii alcoolice. Analiza cu raze X relevăfaptul cămetilarea atomului de sulf influenţează asupra modului de coordinare a liganzilor la ionul de Fe(III). Compuşii 1şi 2 manifestă proprietăţi magnetice diferite.Item Biotestarea şi estimarea toxicităţii compuşilor metalooragnici asupra populaţiei de Paramecium caudatum [Articol](CEP USM, 2016) Toderaș, Ion; Gulea, Aurelian; Roșcov, Elena; Garbuz, OlgaÎn articol este studiată influenţa unor grupuri de substane metaloorganice asupra microorganismelor acvatice. Este utilizată metoda de biotestare toxicologică a compuşilor coordinativi CMT-28 şi CMA-18 asupra ciliatelor Paramecium caudatum Ehrnbg,în concentraţii de 100, 10, 1, 0,1, 0,01 uM/L, comparativ cu prototipul. Metoda de biotestare ne permite să formulăm rapid concluzii în plan comparat, evitând riscul unei erori înalte.Proprietăţile compuşilor metaloorganici au fost cercetate prin metoda diluărilor în serie, în mediul nutritiv lichid (1 g soluţie nutritivă/1 l apă). În calitate de culturi de referinţăau fost folosite ciliatele Paramecium caudatm. Infuzoriile, ca obiecte de cercetare, sunt foarte comode, se reproduc destul de rapid, fiind cele mai convenabile test-obiecte pentru investigaţii în condiţii de laborator, în care factorul timp joacăun rol decesiv, inclusiv pentru elucidarea impactului unor factori abiotici (substanţelor metaloorganice) asupra procesului de reproducere asexuatăla Paramecium caudatum. Activitatea substanţelor a fost evaluată după caracterul toxicităţii preparatelor (LT50 şi LC50), iar activitatea ciliatelor a fost studiată după caracterul viabilităţii şi parametrii reproductivi (creşterea sau diminuarea efectivului numeric şi a ratei lor de reproducere). Toxicitatea acută(LT50 şi LC50) a compuşilor a fost cercetată conform recomandărilor metodice privind studierea toxicităţii generale a remediilor farmaceutice. LC50(concentraţia letală, 50%) – concentraţia care cauzează moartea a 50% din test-organisme într-o anumită perioadă de timp. LT50(timpul letal, 50%) – timpul în care concentraţia utilizată a compusului testat cauzează moartea a 50% din organismele testate.Item Design and synthesis of coordination compounds with tetradentate ligands derived from alkylated thiosemicarbazide [Articol](Institute of Chemistry of ASM, 2008) Cocu, M.; Gradinaru, J.; Revenco, M.; Rybak-Akimova, E.; Gărbălău, N.This work is devoted to the investigation of the template reactions of organic compounds derived from S-alkylisothiosemicarbazide and β-dicarbonylic compounds (acetyl(benzoyl)acetone, 2,6-diformylpyridine, 2,6-diformyl-4-methylphenol, 1-hydroxy-2-naphthaldehyde, sodium nitromalonic dialdehyde, 1,1,3,3-tetraetoxypropane, 3-ethoxyacroleine) in the presence of 3d-metal ions, determination of the structure and properties of the prepared complexes. There were elaborated original methods for synthesis of open-chain or macrocyclic coordination compounds of nickel(II), copper(II), oxovanadium(IV) and cobalt(II) with N4, N3O and N2O2 tetradentate ligands. Two types of hexaazamacrocyclic systems with trans- and cis- arrangement of thiosemicarbazide.Item Activizarea reactivilor organici prin coordinare [Articol](Academia de Ştiinţe a Moldovei, 2013) Revenco, MihaiThe paper represents a review of the publications devoted to the studies of the infl uence of the thiosemicarbazones and their analogues coordination on the reactivity of the ligands. There are discussed the ways of activation of every atoms from the thiosemicarbazide fragment, highlighted the types of the observed reactions where the activated atoms are involved, and the new transformations, which have not been described previously. The observed effects were putted in use for elaboration of new methods of organic fi ne syntheses, for obtaining substances for biological applications, new materials including molecular magnets, catalysts, analytical reagents for determination, preconcentration and separation of metal ions.Item Coordination compounds of cobalt, nickel, copper, and zinc with n1 ,n2 -bis(pyridin-2-ylmethylidene)benzene-1,2-diamine and its derivatives [Articol](Pleiades Publishing Ltd., 2014) Pahonțu, Elena; Gulea, Aurelian; Poirier, D.; Tsapkov, V. I.о-Phenylenediamine reacts with 2-formyl-, 2-acetyl-, or 2-benzoylpyridine in ethanol in the presence of cobalt, nickel, copper, or zinc chlorides to form monomeric complexes ML1−3Сl2·nH2O {M = Co,Ni, Cu, Zn; L1 = N1,N2 -bis(pyridin-2-ymethylidene)benzene-1,2-diamine, L2 = N1,N2-bis(pyridin-2-ylethylidene)benzene-1,2-diamine,L3 = N1,N2-bis[phenyl(pyridin-2-yl)methylidene]benzene-1,2-diamine; n = 0–3}.The condensation products (L1−L3) act in the complexes as tetradentate N,N,N,N-ligands. Thermolysis of thecomplexes occurs in two stages: dehydration (70–95°С) and complete degradation (320–450°С). At concentrations of 10–5–10–7 M, the complexes inhibit in vitro growth and proliferation of HL-60 human promyelocytic leukemia cells.Item Coordination chemistry in the Republic of Moldova [Articol](Institute of Chemistry of ASM, 2009) Bulhac, Ion; Gulea, Aurelian; Batâr, DumitruThis 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.