Synthesis and structure of iron(III) coordination compounds with 2,6-diacetylpyridine bis((iso)nicotinoylhydrazones) and coordinated isothiocyanate ions
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DANILESCU, Olga, BOUROSH, Pavlina, BULHAK, Ion. Synthesis and structure of iron(III) coordination compounds with 2,6-diacetylpyridine bis((iso)nicotinoylhydrazones) and coordinated isothiocyanate ions. In: Чугаевская конференция по координационной химии: IV Молодежная школа-конференция «Физико-химические методы в химии координационных соединений», 2-6 octombrie 2017, Нижний Новгород. Нижний Новгород, Россия: Российская Академия Наук, 2017, p. 425.
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Чугаевская конференция по координационной химии 2017
Conferința "Чугаевская конференция по координационной химии"
Нижний Новгород, Rusia, 2-6 octombrie 2017

Synthesis and structure of iron(III) coordination compounds with 2,6-diacetylpyridine bis((iso)nicotinoylhydrazones) and coordinated isothiocyanate ions


Pag. 425-425

Danilescu Olga1, Bourosh Pavlina2, Bulhak Ion1
 
1 Institute of Chemistry of the Academy of Sciences of Moldova,
2 Institute of Applied Physics, Academy of Sciences of Moldova
 
Disponibil în IBN: 31 iulie 2020


Rezumat

As a result of the interaction of Fe(NO3)3·9H2O, 2,6-diacetylpyridine bis((iso) nicotinoylhydrazone)(H2L1/H2L2) and NH4NCS the complexes [Fe(HL1)(NCS)2]·0.25H2O(I) and [Fe(HL2)(NCS)2]·2.33H2O(II) were obtained. Compounds I and II were investigated by IR spectroscopy (in the 4000-400 cm-1 range) and X-ray diffraction studies. The IR spectra of the compounds are characterized by the absence of the ν(C=O) and ν(NH) absorption bands, which proves the coordination of the Schiff bases in the enolic form. Broad bands in the 2700-2400 cm-1 region are attributed to the oscillations of ν(NH+), due the protonation of the heterocyclic nitrogen of the hydrazide component. The most intensive absorption bands occur in the 2050-2040 cm-1 range and are attributed to the oscillations ν(C≡N) for NCS- group coordinated to the metal via nitrogen. The medium intensity bands 817-815 cm-1 are assigned to ν(CS) and those of relatively weak intensity of 480 cm-1 to the oscillations δ(NCS) for the same coordination mode of the NCS- group. The oscillations of ν(C = N)azomet are observed in the 1636-1629 cm-1 range. The average intensity bands in the 600-480 cm-1 region are attributed to the ν(Fe-N) and ν(Fe-O) oscillations. Structures I and II were determined by the X-ray diffraction method. Coordination polyhedra of the metal atoms in I and II are similar and are difined by the set of O2N5 donor atoms, taking the form of a pentagonal bipyramide. As a result, the monodeprotonated HL1 and HL2 ligands are located in the equatorial plan of the bipyramides, with NCSanions coordinated through nitrogen atom in the axial positions. The analysis of crystal packing established that the in compound I molecular complexes are linked in a unidimensional chain through the N-H...N hydrogen bonds, and in II the complexes are joined together by means of water molecules.