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New Co(III) dioximates with hexafluorophosphate ion as stimulators of the proteolytic activity of the micromycete Fusarium gibbosum CNMN FD 12 |
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| Authors: | P N Bourosh E B Coropceanu A A Ciloci S F Clapco O A Bologa C M Bivol J P Tiurina I Bulhac |
| Institution: | 1. Institute of Applied Physics, Academy of Sciences of Moldova, Chisinau, Moldova 2. Institute of Chemistry, Academy of Sciences of Moldova, Chisinau, Moldova 3. Institute of Microbiology and Biotechnology, Academy of Sciences of Moldova, Chisinau, Moldova |
| Abstract: | The coordination compounds Co(DH)2(An)2]PF6] (I) and Co(NioxH)2(Thio)2]PF6] · 0.5DMF · 0.5H2O (II), where DH- and NioxH-are dimethylglyoxime and 1,2-cyclohexanedione dioxime monoanions, respectively; An is aniline; and Thio is thiourea, were synthesized. The composition and structure of the complexes were determined by elemental analysis, IR spectroscopy, and X-ray diffraction. Compounds I and II are ionic and consist of complex cations Co(DioxH)2(A)2]+, where DioxH is the α-dioxime residue, A is neutral organic molecule (aniline or thiourea), and PF6]? anions. The coordination polyhedra of the Co(III) complex cations are octahedra formed by the set of N6 donor atoms of monodeprotonated DH-residues and two An molecules (in I) or by the N4S2 atoms of two NioxH-anions and two Thio molecules (in II). The formation of the crystal structure of I and II is largely determined by the PF6]-anions in which the fluorine atoms serve as acceptors in various hydrogen bonds. The compounds were tested as stimulators of biosynthesis of extracellular proteases of the micromycete Fusarium gibbosum CNMN FD 12. The introduction of the test complexes in optimized concentrations into the nutrition medium for cultivation of the producing strain enhances the biosynthesis of acid and neutral proteases by 63.6 and 92.5%, respectively. |
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