Spectroscopic investigations of new Cu(II), Co(II), Ni(II) complexes with γ-l-glutamyl amide as ligand

Batiu, Carmen; Jelic, C.; Leopold, Nicolae; Cozar, O.; David, L.

doi:10.1016/j.molstruc.2004.11.096

Cited by 13 publications

(8 citation statements)

References 6 publications

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“…Based on the spectroscopic studies, the ligand has been found to coordinate the metal by the carboxylate oxygen and the nitrogen atom belonging to the amino group of the glycine fragment. On the other hand, an additional band appearing at 763-768 cm -1 confirms the coordinative H 2 O-metal bonding, like the other similar complexes [15,20].…”

Section: Esr Spectrasupporting

confidence: 59%

“…The bonding of the ligand to different metal ions was investigated also by comparing the IR spectrum of the free ligand with those of the metal complexes. IR spectrum of free ligand undergoes a certain modification when coordinated to a metal ion [15][16][17][18][19][20]. Partial assignments of the IR absorption bands observed for the free ligand and the metal complexes are given in Table 1 Table 1.…”

Section: The Structure Of the Metal Complexesmentioning

confidence: 99%

“…These bands of the metal complexes were shifted to lower value due to chelating with metal ions. The new bands appearing in the range 421-427 cm -1 are assigned to ν M-O , while those at 541-563 cm -1 could be attributed to ν M-N [15][16][17][18][19][20][21]. In the case of all metal complexes a ν (M-H2O) vibration band appears at 763-768 cm -1 , which is characteristic for coordinated water molecules in the inner coordination sphere [15].…”

Section: The Structure Of the Metal Complexesmentioning

confidence: 99%

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Complexes of selected transition metal ions with n-modified glycine as ligand

Sacalis¹,

Goga²,

Somesan³

2018

Studia UBB Chemia

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A novel series of transitional metal complexes of Cu(II), Co(II), Ni(II), Zn(II) and Fe(II) with N-modified glycine as ligand provide from phenylserinol were synthesized and characterized via elemental analysis, MS, IR, UV-VIS thermogravimetric analysis and ESR. The thermal stability of the ligand and synthesized complexes was discussed in the 20-1000 o C temperature range. The results indicate that the organic compound acts as a bidentate ligand, its coordination involving the carboxylate oxygen and the nitrogen atom belonging to the amino group of the glycine fragment. The shape of ESR spectrum for cooper complex at room temperature suggest an axial symmetry around the metallic ions (gII=2.427, g┴=2.063).

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Section: Esr Spectrasupporting

confidence: 59%

Section: The Structure Of the Metal Complexesmentioning

confidence: 99%

Section: The Structure Of the Metal Complexesmentioning

confidence: 99%

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Complexes of selected transition metal ions with n-modified glycine as ligand

Sacalis¹,

Goga²,

Somesan³

2018

Studia UBB Chemia

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“…The products of the amino acid interaction with d -metal cations can be mono- and bis-ligand particles. In the latter case, bicyclic chelating of the copper cations occurs with formation of 4-coordinate square planar geometry of the coordination center [ 32 , 33 ].…”

Section: Resultsmentioning

confidence: 99%

New Polyporphyrin Arrays with Controlled Fluorescence Obtained by Diaxial Sn(IV)-Porphyrin Phenolates Chelation with Cu2+ Cation

et al. 2021

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New coordination oligomers and polymers of Sn(IV)-tetra(4-sulfonatophenyl)porphyrin have been constructed by the chelation reaction of its diaxialphenolates with Cu2+. The structure and properties of the synthesized polyporphyrin arrays were investigated by 1H Nuclear Magnetic Resonance (1H NMR), Infra Red (IR), Ultra Violet - Visible (UV-Vis) and fluorescence spectroscopy, mass spectrometry, Powder X-Rays Diffraction (PXRD), Electron Paramagnetic Resonance (EPR), thermal gravimetric, elemental analysis, and quantum chemical calculations. The results show that the diaxial coordination of bidentate organic ligands (L-tyrazine and diaminohydroquinone) leads to the quenching of the tetrapyrrole chromophore fluorescence, while the chelation of the porphyrinate diaxial complexes with Cu2+ is accompanied by an increase in the fluorescence in the organo-inorganic hybrid polymers formed. The obtained results are of particular interest to those involved in creating new ‘chemo-responsive’ (i.e., selectively interacting with other chemical species as receptors, sensors, or photocatalysts) materials, the optoelectronic properties of which can be controlled by varying the number and connection type of monomeric fragments in the polyporphyrin arrays.

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“…In Figure S1 (Supporting Information), the main parts of the IR spectra are presented. In the spectra of the Gly and C, the ν(NH 2 ) stretching vibrations appear at 3,114 cm −1 for Gly, and at 3,147 for C. These bands appear to be shifted toward higher frequencies in the spectra of the complexes proving the involvement of the –NH 2 group in the complex formation . The ν(O–H) stretching vibrations appear in the (Gly) and its complex 2 at 3,445 and 3,423 cm −1 , respectively, indicating that deprotonation does not proceed in the complex 2.…”

Section: Resultsmentioning

confidence: 99%