Cobalt(III) dioximates with some guanidine derivatives
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2024-02-12 11:05
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BOLOGA, Olga, DESYATNIK, A., BOUROSH, Pavlina, SHAFRANSKY, V., TIURINA, Janeta, KOROPCHANU, E., LABLYUK, S., BIVOL, Cezara, DVORNINA, Elena, RUSU, Maria, BULHAK, Ion. Cobalt(III) dioximates with some guanidine derivatives. In: The International Conference dedicated to the 55th anniversary from the foundation of the Institute of Chemistry of the Academy of Sciences of Moldova, 28-30 mai 2014, Chișinău. Chișinău, Republica Moldova: Institutul de Chimie al AȘM, 2014, p. 57.
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The International Conference dedicated to the 55th anniversary from the foundation of the Institute of Chemistry of the Academy of Sciences of Moldova 2014
Conferința "The International Conference dedicated to the 55th anniversary from the foundation of the Institute of Chemistry of the Academy of Sciences of Moldova"
Chișinău, Moldova, 28-30 mai 2014

Cobalt(III) dioximates with some guanidine derivatives


Pag. 57-57

Bologa Olga1, Desyatnik A.2, Bourosh Pavlina3, Shafransky V.1, Tiurina Janeta2, Koropchanu E.1, Lablyuk S.2, Bivol Cezara2, Dvornina Elena2, Rusu Maria1, Bulhak Ion1
 
1 Institute of Chemistry of the Academy of Sciences of Moldova,
2 Institute of Microbiology and Biotechnology of the ASM,
3 Institute of Applied Physics, Academy of Sciences of Moldova
 
Disponibil în IBN: 21 ianuarie 2019


Rezumat

The synthesis of the Co(III) dioximates with cyanoguanidine{[Na2(μH2O)2L2(H2O)2][CoIII(DmgH)2(N3)2]}+[CoIII(DmgH)2(N3)2]- (L=(H2N)2C=N–С≡N) (I) and aminoguanidine [H3N-C(=NH)-NH-NH2]+[Co(DmgH)2(N3)2]- (II) on the basis of [CoCl(DmgH)2H2O] was performed. Both complexes contain complex anion [Co(DmgH)2(N3)2]-, (DmgH = monoanion of dimethylglyoxime), confirmed by chemical and X-ray analysis, as well as by the following spectral characteristics: ν(СH3) (2980-2930 cm-1); δ(СH3) (1480 - 1360 cm-1); ν(С≡N) (2065-2022 cm-1); ν(NO-) (~1230 and ~1084 cm-1) and a broad band of weak intensity at ~1750 cm-1, which is typical for the intramolecular hydrogen bonds of the type О–Н···О between monoanions of dimethylglyoxime from complex anions [Co(DmgH)2(N3)2]-. In the IR spectraof I and II, the absorption bands ν(NH2) and ν(NH) in the region 3400-3200 cm-1,δ(NH2) in the region 1650-1590 cm-1, and ν(С≡N) (I) at 2024 cm-1 appear. The X-ray analysis revealed that the compound I is composed from two complex anions [CoIII(DmgH)2(N3)2]-, one of which is independent and the second is linked via anions N3 -with Na atoms of complex cations [Na2(μ-H2O)2L2(H2O)2]2+ in a more complex system {[Na2(-μH2O)2L2(H2O)2][CoIII(DmgH)2(N3)2]}+, in which Na atoms are linked together by two bridging molecules of water. The donor set ON3 provided by one monodentate water molecule, one L and two N3- groups adjacent [CoIII(DmgH)2(N3)2]-, complete the sodium coordination number to 6. In the structure II the charge of the same complex anion is compensated by the organic cation, derived by the protonation of aminguanidine. In the crystals I and II, all NH and NH2 groups of cyanoguanidine and aminoguanidine, and water molecules in I are involved in the formation of hydrogen bonds, in which the atoms of anion N3 - and oxygen atoms of the oxime groups DmgHact as acceptors. The increased interest in obtaining and studying the coordination complexes of transition metals, in many ways, is due to their biological properties, including the possibility of their use as regulators and stimulants of biosynthesis of the microorganisms- producers of valuable biologically active substances - enzymes, vitamins, antibiotics, lipids etc. The obtained coordination compounds were tested in the possibility to stimulate the enzymatic activity of Fusariumgibbosum CNMN FD 12 micromycete strain–producer of acid, neutral and alkaline proteases, with possibility to use these hydrolases in biotechnological production. The results shown that during 6 days of micromycete Fusariumgibbosum submerged cultivation, with the supplementation of coordination compound I in optimally chosen concentration of 5-10 mg/L, the acid proteases biosynthesis increased by 40-50%. This can ensure the obtaining of the proteolyticenzyme preparation enriched with acid proteases.