Synthesis and structure of new iron(III) coordination compound bazed on 1-phenyl-1,3-butanedione isonicotinoylhydrazone
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COCU, Maria, BULHAK, Ion, BALAN, Cristina, BOUROSH, Pavlina. Synthesis and structure of new iron(III) coordination compound bazed on 1-phenyl-1,3-butanedione isonicotinoylhydrazone. In: Materials Science and Condensed Matter Physics, Ed. 7, 16-19 septembrie 2014, Chișinău. Chișinău, Republica Moldova: Institutul de Fizică Aplicată, 2014, Editia 7, p. 171.
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Materials Science and Condensed Matter Physics
Editia 7, 2014
Conferința "Materials Science and Condensed Matter Physics"
7, Chișinău, Moldova, 16-19 septembrie 2014

Synthesis and structure of new iron(III) coordination compound bazed on 1-phenyl-1,3-butanedione isonicotinoylhydrazone


Pag. 171-171

Cocu Maria1, Bulhak Ion1, Balan Cristina1, Bourosh Pavlina2
 
1 Institute of Chemistry of the Academy of Sciences of Moldova,
2 Institute of Applied Physics, Academy of Sciences of Moldova
 
Disponibil în IBN: 24 martie 2019


Rezumat

Schiff bases derived from the condensation of isonicotinic acid hydrazide (isoniazid, INH) with aldehydes and ketones represent an important class of chelating ligands and their metal complexes are of great interest due to their importance in biological, pharmacological and clinical applications [1, 2].  New coordination compound of Fe(III) has been obtained as the result of interaction of 1-phenyl-1,3-butanedione isonicotinoylhydrazone (H2L) with iron nitrate (in molar ratio 2:1) in methanol-water (1:1) media with adding a few drops of pyridine (see fig).  The complex is soluble in chloroform, dimethylformamide, less soluble in ethanol and methanol and insoluble in water. Elemental analysis data confirm the coordination of two molecules of 1-phenyl-1,3-butanedione isonicotinoylhydrazone to iron atom.  According to the X-ray single crystal study, molecular structure of the isolated compound Fe(III) consists of two organic ligands: one monodeprotonated (HL-) and one bideprotonated (L2-) coordinated to one iron atom. The pyridinium proton in this complex is disordered between the two N-atoms (N(3) and N(6)) similar to the corresponding Fe(III) complexes [3] and the formula is [Fe(HL)(L)]·1.5H2O.  Coordination surrounding of the Fe(II) represents an N2O4 octahedron, being defined by ONO donor atoms of two tridentate organic ligands. The formation of this complex is accompanied by formation of two metallo-cycles: one five-membered (FeOCNN) and one six-membered (FeNCCCO), with the following atoms distances: Fe(1)–O(1)= 2.009(4), Fe–N(1)= 2.122(6), Fe(1)–O(2)=1.973(4), Fe(1)–O(3)=2.056(4), Fe–N(4)=2.092(5) and Fe(1)–O(4)=1.953(4) Å. The complexes in the crystal are united in dimmer by intermolecular H-bonds N(6)–H×××N(6) (–x, –y+2, –z) (N(6)–H 0.86 Å, H×××N(6) 1.82 Å, N(6)×××N(6) 2.672 Å, ÐNHN 174°.