Iron(II) Bis-α-Benzyldioximate Complexes with 3- and 4-Pyridine Hemiacetals as Axial Ligands: Synthesis, Structure, and Physicochemical Properties
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BOUROSH, Paulina; BULHAK, Ion; COVACI, Olga; ZUBAREVA, Vera; MITINA, Tatiana. Iron(II) Bis-α-Benzyldioximate Complexes with 3- and 4-Pyridine Hemiacetals as Axial Ligands: Synthesis, Structure, and Physicochemical Properties. In: Russian Journal of Coordination Chemistry/Koordinatsionnaya Khimiya. 2018, nr. 8(44), pp. 507-517. ISSN -.
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Russian Journal of Coordination Chemistry/Koordinatsionnaya Khimiya
Numărul 8(44) / 2018 / ISSN - /ISSNe 1070-3284

Iron(II) Bis-α-Benzyldioximate Complexes with 3- and 4-Pyridine Hemiacetals as Axial Ligands: Synthesis, Structure, and Physicochemical Properties


DOI: 10.1134/S1070328418080018
Pag. 507-517

Bourosh Paulina1, Bulhak Ion2, Covaci Olga2, Zubareva Vera2, Mitina Tatiana2
 
1 Institute of Applied Physics,
2 Institutul de Chimie
 
Disponibil în IBN: 7 decembrie 2018


Rezumat

Abstract: The coordination compounds [Fe(DfgH)2(HL1)2] and [Fe(DfgH)2(HL2)2], where DfgH = is the α-benzyldioxime monoanion, HL1 = 3-pyridine hemiacetals: methoxy(pyridin-3-yl)methanol (I), ethoxy(pyridin-3-yl)methanol (II); HL2 = 4-pyridine hemiacetal: methoxy(pyridin-4-yl)methanol (III), ethoxy(pyridin-4-yl)methanol (IV), and propoxy(pyridin-4-yl)methanol (V), were synthesized and studied by X-ray diffraction and IR and Mössbayer spectrosopy. According to X-ray diffration data (CIF files CCDC 1578217–1578221 for I–V, respectively), all of these Fe(II) complexes are molecular. The metal coordination polyhedron is an octahedron formed by four equatorial nitrogen atoms of two monodeprotonated α-benzyldioxime residues coordinated in the bidentate chelating fashion and by two axial nitrogen atoms of two neutral 3- or 4-pyridine hemiacetal molecules coordinated in the monodentate fashion. The DfgH ligands in complexes I–V are joined by intramolecular O–H···O hydrogen bonds to form a pseudomacrocyclic system. The ligands HL1 and HL2 are generated in the reaction of the corresponding alcohols with 3- or 4-pyridinecarboxaldehyde. The IR and Mössbauer spectra of the products were studied. The Mössbauer spectral parameters of compounds I–V correspond to low-spin iron(II) ions.

Cuvinte-cheie
IR spectrairon(II) α-benzyldioximates, Mössbauer s-pectra, pyridine hemiacetals,

X-ray diffraction