Polymeric Mn(II) coordination compounds based on bis((iso)nicotinoylhydrazones) N5O2 donor ligands
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DANILESCU, Olga, COCU, Maria, BULHAK, Ion, BOUROSH, Pavlina. Polymeric Mn(II) coordination compounds based on bis((iso)nicotinoylhydrazones) N5O2 donor ligands. In: Achievements and perspectives of modern chemistry, 9-11 octombrie 2019, Chişinău. Chisinau, Republic of Moldova: Tipografia Academiei de Ştiinţe a Moldovei, 2019, p. 92. ISBN 978-9975-62-428-2.
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Achievements and perspectives of modern chemistry 2019
Conferința "International Conference "Achievements and perspectives of modern chemistry""
Chişinău, Moldova, 9-11 octombrie 2019

Polymeric Mn(II) coordination compounds based on bis((iso)nicotinoylhydrazones) N5O2 donor ligands


Pag. 92-92

Danilescu Olga1, Cocu Maria1, Bulhak Ion1, Bourosh Pavlina2
 
1 Institute of Chemistry,
2 Institute of Applied Physics
 
Disponibil în IBN: 5 noiembrie 2019


Rezumat

Complexes derived from 2,6-diacetylpyridine (dap) hydrazones and transition metal ions have yielded a surprisingly rich chemistry. The dap ligands, due to their multicoordination sites, are capable of efficiently stabilizing the metal center by forming unique geometries. This study shows a new possibility for dap derived ligands to build up polymeric compounds. As a result of interaction MnSO4 · 5H2O with 2,6-diacetylpyridine bis(isonicotinoylhydrazone) (H2L1) or 2,6-diacetylpyridine bis(nicotinoylhydrazone) (H2L2) (molar ratio of 1:1) in ethanol/dimethylformamide (dmf) mixture under solvothermal conditions, 2D coordination polymers {[Mn3(L1)3(H2O)2]·1.5C2H5OH}n (1) and {[Mn(L2)] · dmf}n (2) (Figure), were synthesized. The coordination spheres of the metal in1 and in the complex {[Mn3(L1)3(H2O)2]·dmso}n[1] are similar, these two isostructural chemical compounds are solvatomorphs. Compound 2 crystallizes in the orthorhombic centrosymmetric space group P21212, a = 12.9449(4), b = 9.5117(4), c = 9.9745(4) Å. The X-ray analysis reveals the sevencoordinated (N5O2) Mn(II) ion with a pentagonal bipyramidal environment. The dianion of the 2,6-diacetylpyridine bis(nicotinoylhydrazone) moiety ((L2)2-) occupies the equatorial plane coordinating to metal through the pyridine nitrogen (Mn(1)–N(4) 2.321(5) Å), the two imine nitrogens (Mn(1)–N(3) 2.288(4) Å) and the two amide oxygens (Mn(1)–O(1) 2.211(2) Å). The axial Mn(1)–N(1) bond lengths are of 2.342(4) Å.Figure. Coordination environment of Mn(II) ion in 2 with the partial numbering scheme (a) and fragment of crystal structure (b)The intense band, observed at 1671 cm-1 in the IR spectrum of the compound 2, is due to the presence of the cetone groups (distance, C=O = 1.253(6) Å). The spectrum also shows the absence of the v(N-H) band, which in the free ligand appears at 3187 cm-1. This is in accordance with the dianionic nature of the ligand.