Preparation and characterization of novel [Fe(methylisopropylglyoximato)2(amine)2] mixed chelates

Abstract

A series of novel [Fe(MeiPrGlyoxH) 2 (amine) 2 ] complexes have been synthesized [(MeiPrGlyoxH 2 = methylisopropylglyoxime, amine = 3,5-dimethylpyridine, 4-(dimethylamino)pyridine, 4-(phenylamino)phenol, 2-imidazolidone)] and characterized by 57 Fe Mössbauer, FTIR, UV-Vis spectroscopy, mass spectrometry, AFM and thermoanalytical methods. Quantum chemical (DFT) computations of [Fe(MeiPrGlyoxH) 2 (3,5-dimethyl-Py) 2 ] (Py = pyridine) complex were also performed. The square-planar structure of [Fe(MeiPrGlyoxH) 2 ] moiety is similar to that of [Fe(MeEtGlyoxH) 2 ]. The incorporation of branching alkyl chains (isopropyl) in the complexes alters the Fe-N bond length and results in high-spin iron(II) state.

Mössbauer study of some novel iron-bis-glyoxime and iron-tris-glyoxime complexes

“…In the case of bis-glyoxime complexes, as we found earlier [1,2] a high volume demand branching alkyl chain, like isopropyl on the carbon atom of the glyoxime resulted in high spin state. It is logical to assume that the planar bis-glyoxime moiety is flexible enough to get distorted by large alkyl groups, and in a non-planar structure the electron donation from the ligand to the 3d shell of iron is less effective, the formal ligand strength decreases, and the preferred spin state will be high spin.…”

“…The results can be discussed by asking the question why the incorporation of relative high volume demand alkyl chains or aromatic rings in the iron-tris-glyoximes do not alter the Fe-N interatomic distances to be critical for appearance of high spin iron(II) state, dissimilarly as found earlier [1,2] in the case of iron-bis-glyoximes.…”

“…In the case of iron-bis glyoximes [1,2] it was shown that high spin Fe II state occurred (Table 1) when branched chain ligand was built in the dioxime plane. The reason that the highspin state in the planar iron-bis-glyoxime complex containing the higher-volume demand branched-chain ligand become more favorable is that the larger-volume demand ligands change the molecular geometry in such a way that the bond distances between the planar nitrogen atoms and the iron atom increase.…”

Efficient photo-Fenton catalysis using magnetic iron nanoparticles decorated boron nitride quantum dots: theoretical and experimental investigations

“…The broad peak at 1450 cm −1 is due to the bending mode of B-OH 41 and the stretching mode of B-N. 42 In addition, a peak at 2498.22 cm −1 and a broad peak at 3207.55 cm −1 have resulted from the stretching vibration mode of B-OH and B-NH 2 . 44,46,49 Compared with the FTIR spectrum of Fe@BNQDs, there were some additional signals aer BNQDs were decorated with Fe atoms; the bands at 547.09 cm −1 have resulted from the Fe-N stretching mode, 50 and 642.8 cm −1 is ascribed to the Fe-O stretching vibration mode, [51][52][53] the bands at 1633.46 cm −1 and 3220.28 cm −1 correspond to Fe-OH bending and stretching vibration, respectively. [52][53][54] The crystal structure of the product was analyzed using powder XRD spectra.…”

Synthesis, physico-chemical characterization and bacteriostatic study of Pt complexes with substituted amine ligands

“…Thermoanalytical methods provide important information on the thermal stability, polymorphic forms or structural changes [26,27,28], and purity of potential new drugs [29,30,31,32]. In continuation of our earlier work on synthesis, physical and chemical characterization of iron(II) complexes with amine ligands [33] in this paper Pt(II) coordination compounds with different amine ligands are described. The aim of this study was the synthesis, physical, chemical and antimicrobial characterization of biologically active compounds of general formula PtCl 2 R 2 under the same reaction conditions, where R is a selected amine ligand.…”