Mono- and oligonuclear complexes based on a o-vanillin derived Schiff-base ligand: Synthesis, crystal structures, luminescent and electrochemical properties

Buta, Ildiko; Shova, Sergiu; Motoc, Sorina; Manea, Florica; Andruh, Marius; Costişor, Otilia

doi:10.1016/j.molstruc.2021.131439

Cited by 8 publications

(9 citation statements)

References 56 publications

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“…The involvement of the phenolic oxygen atoms in the metal-ligand bonding is confirmed by the strong doublet bands observed at 1251 cm −1 , 1218 cm −1 1 and 1248 cm −1 , 1219 cm −1 2, respectively. The typical absorption band of the ν aryl -O vibration is identified in the free ligand spectrum at 1233 cm −1 [4,13,[38][39][40][41][42][43][44]. All these spectroscopic features are confirmed by the X-ray structures.…”

Section: Infrared Spectramentioning

confidence: 55%

“…In recent years, much progress in the synthesis and investigation of heteronuclear 3d-4f Schiff base coordination compounds has been observed [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18]. Their crystal structures and properties are determined by several factors, e.g., type of the metal ions, metal-to-ligand stoichiometry, the nature and position of the ligands, methods of synthesis (a stepwise reaction or one-pot reaction, Figure 1), type of solvents, kind of coligands, etc.…”

Section: Introductionmentioning

confidence: 99%

“…The salen-type Schiff bases are ligands obtained from salicylaldehyde or its derivatives and different diamines. They usually consist of rigid aromatic rings and flexible aliphatic chains [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19]. In the coordination compounds formed by them, 3d and 4f metal ions are captured simultaneously and linked together through two O phenol atoms.…”

Section: Introductionmentioning

confidence: 99%

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New Heterotrinuclear CuIILnIIICuII (Ln = Ho, Er) Compounds with the Schiff Base: Syntheses, Structural Characterization, Thermal and Magnetic Properties

2022

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New heterotrinuclear complexes with the general formula [Cu2Ln(H2L)(HL)(NO3)2]×MeOH (Ln = Ho (1), Er (2), H4L = N,N′-bis(2,3-dihydroxybenzylidene)-1,3-diaminopropane) were synthesized using compartmental Schiff base ligand in conjugation with auxiliary ligands. The compounds were characterized by elemental analysis, ATR-FTIR spectroscopy, X-ray diffraction, TG, DSC, TG-FTIR and XRD analysis. The N2O4 salen-type ligand coordinates 3d and 4f metal centers via azomethine nitrogen and phenoxo oxygen atoms, respectively, to form heteropolynuclear complexes having CuO2Ln cores. In the crystals 1 and 2, two terminal Cu(II) ions are penta-coordinated with a distorted square-pyramidal geometry and a LnIII ion with trigonal dodecahedral geometry is coordinated by eight oxygen atoms from [CuII(H2L)(NO3)]- and [CuII(HL)(NO3)]2- units. Compounds 1 and 2 are stable at room temperature. During heating, they decompose in a similar way. In the first decomposition step, they lose solvent molecules. The exothermic decomposition of ligands is connected with emission large amounts of gaseous products e.g., water, nitric oxides, carbon dioxide, carbon monoxide. The final solid products of decomposition 1 and 2 in air are mixtures of CuO and Ho2O3/Er2O3. The measurements of magnetic susceptibilities and field dependent magnetization indicate the ferromagnetic interaction between CuII and HoIII ions 1.

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Section: Infrared Spectramentioning

confidence: 55%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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New Heterotrinuclear CuIILnIIICuII (Ln = Ho, Er) Compounds with the Schiff Base: Syntheses, Structural Characterization, Thermal and Magnetic Properties

2022

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“…The IR spectrum of the ligand H 2 AD1Me exhibited a strong band at 1636 cm –1 assignable to the azomethine ν(C=N) group. 24 , 25 Upon complexation, the ν(C=N) and ν(C–N) shifted to lower frequencies by of 26–28 cm –1 and 7–13 cm –1 , respectively, a strong indicator that imine nitrogen is involved in coordination with metal ions. 3 This was also supported by the appearance of new peaks of 568 and 545 cm –1 assignable to ν(Pd–N) and ν(Ni–N), respectively.…”

Section: Resultsmentioning

confidence: 99%

“…The IR spectrum of the ligand H 2 AD1Me exhibited a strong band at 1636 cm −1 assignable to the azomethine ν(C�N) group. 24,25 Upon complexation, the ν(C�N) and ν(C−N) shifted to lower frequencies by of 26−28 cm −1 and 7−13 cm −1 , respectively, a strong indicator that imine nitrogen is involved in coordination with metal ions. 3 This was also supported by the appearance of new peaks of 568 and 545 cm −1 assignable to ν(Pd−N) and ν(Ni−N), respectively.…”

Section: Physicochemical and Spectroscopic Characterizationmentioning

confidence: 99%

Synthesis, Structural Characterization, Hirshfeld Surface Analysis, and Antibacterial Study of Pd(II) and Ni(II) Schiff Base Complexes Derived from Aliphatic Diamine

et al. 2022

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A Schiff base bearing two methyl substituents, namely, 6,6′-((1E,1′E)-((2,2-dimethylpropane-1,3-diyl) bis(azanylylidene)) bis(methanylylidene)) bis(2-methylphenol) [H2AD1Me] was synthesized and characterized through physicochemical and spectroscopic analyses. Then, the Schiff base was complexed with Pd(II) and Ni(II) to form [Pd(AD1Me)] and [Ni(AD1Me)], respectively. Both metal complexes were successfully obtained and characterized through several analyses, viz., melting point, elemental analysis, molar conductivity, magnetic susceptibility, FTIR, 1H NMR, UV–vis, and single crystal X-ray diffraction. A quantitative analysis of the intermolecular interactions in the crystal structures has been performed using Hirshfeld surface analysis. Both metal complexes were crystallized in a monoclinic crystal system with the space group of P21/c. Additionally, the deprotonated phenolic oxygen atom (O1/O2) and azomethine nitrogen atom (N1/N2) of the ligand chelate the Pd(II) and Ni(II) ions, forming a slightly distorted square-planar complex containing three six-membered rings encircling the metal core with dsp2 hybridization. The shift of ν(CN) to a higher frequency in FTIR by 26–28 cm–1 indicated that the complexation to Pd(II) and Ni(II) through the azomethine N was established. It was further supported through the shifting of the azomethine proton signal to higher or lower chemical shifts with Δδ = 0.43–1.15 ppm in 1H NMR. In addition, the shifting of the n−π*(CN) band in UV–vis spectra with Δλ = 24–40 nm indicated the involvement of azomethine nitrogen in the complexation. All the compounds showed no significant antibacterial activity against three bacterial strains, namely, Staphylococcus aureus subsp. aureus Rosenbach (ATCC 6538), Streptococcus mutans Clarke (ATCC 700,610), and Proteus vulgaris (ATCC 6380), as the percent growth inhibition calculated was less than 90%.

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Synthesis, structure, and catalytic performance of solvent induced zinc clusters in furan synthesis by cycloisomerization reaction

Farzaneh‐Bonab,

Bikas,

Noshiranzadeh

et al. 2024

Applied Organom Chemis

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Two Zn(II) clusters were synthesized by the reaction of Zn(OAc)2·2H2O and 1,2‐bis(2‐hydroxy‐3‐methoxybenzylidene)hydrazine as a N2O4‐donor Schiff base ligand in 1:3 molar ratio. The reaction in methanol gave yellow‐brown needle crystals, while block yellow crystals were achieved in a mixture of methanol:water (50:50 v/v). Investigation of the crystals by single crystal X‐ray analysis showed that solvent has considerable effect on the structure and composition of the products. In methanol, two independent pentanuclear Zn(II) clusters with the same general formula of [Zn5(L)2(μ‐OAc)4(OAc)2(CH3OH)2] but different coordination environments around Zn(II) cores, and bridging mode of the acetate ligands are present in the unit cell. In a mixture of methanol:water, a pentanuclear cluster and a 1D coordination polymer with pentanuclear repetitive unit are simultaneously present in the crystal structure. These compounds were further characterized by spectroscopic techniques, and they were used as catalysts for intramolecular cycloisomerization of 1,4‐diphenylbut‐3‐yn‐1‐one. The results indicated that these Zn(II) clusters can efficiently produce 2,5‐diphenylfuran through catalytic cycloisomerization reaction.

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Mono- and oligonuclear complexes based on a o-vanillin derived Schiff-base ligand: Synthesis, crystal structures, luminescent and electrochemical properties

Cited by 8 publications

References 56 publications

New Heterotrinuclear CuIILnIIICuII (Ln = Ho, Er) Compounds with the Schiff Base: Syntheses, Structural Characterization, Thermal and Magnetic Properties

New Heterotrinuclear CuIILnIIICuII (Ln = Ho, Er) Compounds with the Schiff Base: Syntheses, Structural Characterization, Thermal and Magnetic Properties

Synthesis, Structural Characterization, Hirshfeld Surface Analysis, and Antibacterial Study of Pd(II) and Ni(II) Schiff Base Complexes Derived from Aliphatic Diamine

Synthesis, structure, and catalytic performance of solvent induced zinc clusters in furan synthesis by cycloisomerization reaction

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