Complexes of Mn(II), Co(II), Ni(II), Cu(II) and Zn(II) with ligand formed by condensation reaction of isatin with glutamic acid

Abstract

<jats:p>The complexes of Mn(II), Co(II), Ni(II), Cu(II) and Zn(II) with ligand (H2L=C13H12N2O5) formed by condensation reaction of isatin and glutamic acid were synthesized. Their physico-chemical properties were characterized using elemental analysis, XRF, XRD, FTIR, TG–DSC and TG–FTIR methods and magnetic measurements (Gouy’s and SQUID-VSM methods). The complexes were obtained in crystalline forms (monoclinic or triclinic) with the formulae: M(LH)2·nH2O for Mn(II), Ni(II) and Zn(II) and ML·nH2O for Co(II) and Cu(II), where LH=C13H11N2O5–, L-=C13H10N2O52–, n = 1 for Mn(II), Cu(II) and Zn(II), n = 2 for Co(II) and n = 3 for Ni(II). In air at 293–1173 K they decompose in three steps forming finally the oxides of the appropriate metals. The gaseous decomposition products were identified as: H2O, CO2, CO, hydrocarbons and N2O. The magnetic moment values for complexes (except Zn(II) complex) show their paramagnetic properties with the ferro- and antiferromagnetic interactions between central ions. The compounds of Mn(II) and Co(II) are high spin complexes with weak ligand field. In Co(II) and Cu(II) complexes two carboxylate groups take part in the metal ion coordination while in those of Mn(II), Ni(II) and Zn(II) only one carboxylate anion coordinates to central ion.</jats:p>

From Metal Complexes to BioMOFs: An Experimental Proposal for Teaching Coordination Chemistry Concepts

“…The most useful bands are those resulting from the symmetric and asymmetric stretching of the −COOH and −NH 2 groups, since the difference between the absorption frequencies of the stretching bands for each of these groups can be used to evidence amino acid coordination. Table S2 summarizes the assignments ,, of the main bands observed in the infrared for the glutamic acid, BioMOFs, and metal complexes.…”

Transition metal (Ni,Mn) codoped Zn3P2 nanoparticles: effect on structural, optical and magnetic properties

“…As a result, the local spin-polarized electrons of other Ni and Mn ions interact with the spin-polarized conductive electrons through an exchange interaction. The transition elements Ni (2.80-3.50 μB) and Mn (5.32-6.10 μB) will have an effective magnetic moment was seen experimentally reported [37]. Zeppenfeld et al [38] discussed Ni 2 P compounds were seen as a paramagnetic behavior at 2 K to 300 K and reported that Ni 2 P compounds show high nickel content.…”

Compartmentalized agents: A powerful strategy for enhancing the detection sensitivity of chemical exchange saturation transfer contrast

“…ICP‐MS measurements reported that a very high amount of Co (II) was entrapped inside the yeast cells (~ 10 10 –10 11 ions/cell, corresponding to intracellular concentrations of 1.4–17.6 and 0.3–4 M, depending on the Co (II) complex used and assuming the yeast cells were spherical with a diameter in the range of 5 ± 2 μm). Even when considering the rather low μ eff value of Co (II) (2.8–3.2), 66 the very high intracellular concentration of the SR meant that a larger chemical shift separation for the intracellular water protons was expected than was actually observed (< 2 ppm). As hypothesized by the authors, this may be the result of SR sequestering by yeast organelles, as was demonstrated in fluorescence microscopy experiments.…”