Synthesis and characterisation of Co(II), Ni(II), Zn(II) and Cd(II) complexes with 5-bromo-N,N′-bis-(salicylidene)-o-tolidine

Alan, Ionela; Kriza, Angela; Badea, Mihaela; Stănică, Nicolae; Olar, Rodica

doi:10.1007/s10973-012-2249-y

Cited by 13 publications

(8 citation statements)

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“…[31][32][33][34] These tetradentate chelating Schiff bases can coordinate transition metals,allowing to tune their luminescent properties by structural modification in the ligand framework and by changing the metal in their coordination site. 12,13,15, [35][36][37][38][39] Electroluminescent compounds can be obtained through the coordination of zinc(II) ions by salicylidenes. [35][36][37] Metal to ligand and intraligand charge transfer processes can be observed in the absorption spectrum of zinc(II) salicylidene compounds.…”

Section: Introductionmentioning

confidence: 99%

Structural Correlations between Luminescent Properties and Excited State Internal Proton Transfer in Some Zinc(II) N,N′-Bis(salicylidenes)

et al. 2015

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In this study two salicylidene ligands, N,N'-bis(salicylidene)-1,2-phenylenediamine and N,N'-bis(salicylidene)-4,5-diaminopyrimidine, and their respective aquo-zinc(II) coordination compounds were synthesized. Their characterization was performed by FTIR, proton and carbon NMR, elemental analysis,mass spectroscopy and cyclic voltammetry. Crystal structures of the ligands were determined by monocrystal X-ray diffraction. The photoluminescent properties under photostationary conditions indicate that the ligand emission predominates in both the pristine materials and their zinc(II)complexes. For both ligands, the coordination of a metal atom leads to a redshift of their emission bands in both solvent and solid state. Molecular structures and excitation energies of ligands and complexes were evaluated at DFT level using PBE0/aug-cc-pVDZ. Their ligand and complex electronic transitions can be assigned mainly to the intraligand π→π * type, mainly involving frontier molecular orbitals, with a small participation of the metal. According to our calculations, there is an increasing in the planarity of the ligand structure in the complex, which could explain the redshifting observed in the absorption and emission spectra. The dynamic photoluminescence suggests the occurrence of excited state intramolecular proton transfer from the oxygen to the nitrogen atoms in the coordination site of the sal-4,5-pym.Moreover, they are able to predict the occurrence of the excited state internal proton transfer for the sal-4,5-pym. The dynamic of this proton transfer is demonstrated by both, time resolved emission spectra (TRES) and studies in protic solvent (ethanol).

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Section: Introductionmentioning

confidence: 99%

Structural Correlations between Luminescent Properties and Excited State Internal Proton Transfer in Some Zinc(II) N,N′-Bis(salicylidenes)

et al. 2015

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“…In the range of 1450-1550 cm −1 , the bands characteristic for vibration mode of C=C of the aromatic rings can be observed [22,23]. The bands located in about 1180 cm −1 are assigned to C-O vibration [22,23]. Additional two bands at 409 cm −1 and 515 cm −1 assigned to stretching vibrations M-N and M-O can be observed in the spectra of complexes [22,23].…”

Section: Schiff Base Complexesmentioning

confidence: 92%

“…The bands located in about 1180 cm −1 are assigned to C-O vibration [22,23]. Additional two bands at 409 cm −1 and 515 cm −1 assigned to stretching vibrations M-N and M-O can be observed in the spectra of complexes [22,23].…”

Section: Schiff Base Complexesmentioning

confidence: 92%

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Mn₂O₃ Nanoparticles Synthesized from Thermal Decomposition of Manganese(II) Schiff Base Complexes

Khalaji

Ghorbani

2018

Acta Phys. Pol. A

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The Mn2O3 nanoparticles have been prepared using solid state thermal decomposition of MnL 1 and MnL 2 , L 1 = N, N -bis(2-hydroxy-4-methoxybenzophenone)-1,3-propanediamine and L 2 = N, N -bis(2-hydroxy-4-methoxybenzophenone)-1,2-cyclohexanediamine, at 500• C for 3 h and characterized by the Fourier transform infrared spectroscopy, X-ray powder diffraction and scanning electron microscopy. The Fourier transform infrared spectroscopy and X-ray powder diffraction confirm that the formed product at 500• C is Mn2O3. The MnL 1 and MnL 2 complexes were prepared from the one-pot reaction of MnCl2·H2O, diamine and 2-hydroxy-4-methoxybenzophenone and characterized by elemental analyses, the Fourier transform infrared spectroscopy and thermogravimetry.

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“…[1][2][3][4][5][6] These complexes are also interesting as models for enzymes involved in several biochemical processes. 9,10 Following previous research, 11 in this paper, data is presented concerning the synthesis and characterisation of Co(II), Ni(II), Cu(II) complexes with a new Schiff base obtained through o-tolidine (3,3′-dimethylbenzidine) condensation with o-vanillin (2-hydroxy-3-methoxybenzaldehyde) (Fig. 9,10 Following previous research, 11 in this paper, data is presented concerning the synthesis and characterisation of Co(II), Ni(II), Cu(II) complexes with a new Schiff base obtained through o-tolidine (3,3′-dimethylbenzidine) condensation with o-vanillin (2-hydroxy-3-methoxybenzaldehyde) (Fig.…”

Section: Introductionmentioning

confidence: 87%

New complexes of Co(II), Ni(II), Cu(II) with Schiff base N,N’-bis-(3-methoxy-saliciliden)-3,3’-dimethylbenzidine

Alan

Kriza

Dracea

et al. 2013

JSCS

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The new N,N’-bis-(3-methoxy-saliciliden)-3,3’-dimetilbenzidine (H2L) Schiff base and complexes with Co(II), Ni(II) and Cu(II) of type [M(HL)Cl(H2O)] (M=Co(II), Cu(II)) [M2L(H2O)4]X2 (M=Co(II), X=ClO4 and M=Cu(II), X=NO3) and [M2L(CH3COO)2] (M=Co(II), Ni(II), Cu(II)) were synthesised. The ligand and complexes were characterized by elemental analysis, conductibility measurements, magnetic moments at room temperature, IR, NMR, UV-VIS-NIR, EPR spectra and thermogravimetric analysis. A molar ratio of 1:1 or 1:2 between ligand and metal was determined from the elemental analysis. Except for perchlorate complex that behave as electrolyte, the rest of complexes are non-electrolytes. The spectral data suggest a tetrahedral, pseudo-tetrahedral or square-planar stereochemistry respectively, data confirmed by magnetic behaviour of complexes. The antimicrobial tests indicate a fungicide effect both for ligand and complexes

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Synthesis and characterisation of Co(II), Ni(II), Zn(II) and Cd(II) complexes with 5-bromo-N,N′-bis-(salicylidene)-o-tolidine

Cited by 13 publications

References 35 publications

Structural Correlations between Luminescent Properties and Excited State Internal Proton Transfer in Some Zinc(II) N,N′-Bis(salicylidenes)

Structural Correlations between Luminescent Properties and Excited State Internal Proton Transfer in Some Zinc(II) N,N′-Bis(salicylidenes)

Mn₂O₃ Nanoparticles Synthesized from Thermal Decomposition of Manganese(II) Schiff Base Complexes

New complexes of Co(II), Ni(II), Cu(II) with Schiff base N,N’-bis-(3-methoxy-saliciliden)-3,3’-dimethylbenzidine

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Synthesis and characterisation of Co(II), Ni(II), Zn(II) and Cd(II) complexes with 5-bromo-N,N′-bis-(salicylidene)-o-tolidine

Cited by 13 publications

References 35 publications

Structural Correlations between Luminescent Properties and Excited State Internal Proton Transfer in Some Zinc(II) N,N′-Bis(salicylidenes)

Structural Correlations between Luminescent Properties and Excited State Internal Proton Transfer in Some Zinc(II) N,N′-Bis(salicylidenes)

Mn2O3 Nanoparticles Synthesized from Thermal Decomposition of Manganese(II) Schiff Base Complexes

New complexes of Co(II), Ni(II), Cu(II) with Schiff base N,N’-bis-(3-methoxy-saliciliden)-3,3’-dimethylbenzidine

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Mn₂O₃ Nanoparticles Synthesized from Thermal Decomposition of Manganese(II) Schiff Base Complexes