&lt;b&gt;Potentiometric determination of K&lt;sup&gt;+&lt;/sup&gt; ions using a K&lt;sup&gt;+&lt;/sup&gt;-selective electrode with macrocyclic liquid membrane&lt;/b&gt;

Spînu, Cezar; Isvoranu, Marian; Pleniceanu, Maria; Tigae, Cristian

doi:10.4314/bcse.v22i2.61301

Cited by 5 publications

(8 citation statements)

References 9 publications

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“…Upon comparison, it was determined that the υ(C=N) stretching vibration is found in the free ligands at 1604 and 1633 cm −1 for the LH and L 1 ligands, respectively. This band was shifted to higher or lower wave numbers in the complexes, indicating the participation of the azomethine nitrogen in coordination (M-N) [10]. The bands appearing between 1520 and 1600 cm -1 have been assigned to aromatic or thiophene υ C=C .…”

Section: Infrared Spectramentioning

confidence: 99%

“…These bands can be attributed to π-π * and n-π * transitions within the Schiff bases. Being a d 10 system, the present Cd(II) and Zn(II) complexes show no d-d transition in the visible region, and are colored only through their intense charge transfer absorptions tailing in from the ultraviolet. Besides, the other bands are due to intra ligand transitions.…”

Section: Electronic Spectramentioning

confidence: 99%

“…Metal complexes [Fe(II), Co(II), Ni(II), Cu(II), Zn(II), or Cd(II)] of the Schiff bases formed by condensation of 2-thiophenecarboxaldehyde with 2-aminopyridine, N-(2-thienylmethylidene)-2-aminopyridine have been prepared and characterized [10]. Co(II), Ni(II) and Cu(II) complexes of three Schiff bases, derived from the condensation reaction of thiophene-2-carbaldehyde and DL-alanine, DL-valine and DL-phenylalanine, have been synthesized and characterized by their analytical and spectral data [3] [12].…”

Section: Introductionmentioning

confidence: 99%

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Metal Complexes of Schiff Bases Derived from 2-Thiophenecarboxaldehyde and Mono/Diamine as the Antibacterial Agents

Uddin¹

2014

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Abstract:The Schiff bases, formed by condensation of 2-thiophenecarboxaldehyde with 2-aminothiophenol (LH) and propane-1,2-diamine (L 1 ), and their complexes of Ni(II), Cu(II), Zn(II) and Cd(II) have been prepared and characterized by elemental analysis, and magnetic and spectroscopic measurements. Infrared and NMR spectra of the complexes agree with the coordination to the central metal atom through the nitrogen of the azomethine (-HC=N-) group and the sulfur atom of the thiophene ring. Magnetic susceptibility data coupled with electronic suggest octahedral structure for the complexes. Conductance measurements suggest the non-electrolytic nature of the complexes. Stoichiometry of complexes has been suggested as [M(L) 2 ] and [ML 1 Cl 2 ]. The Schiff base and its metal chelates have been screened for their in vitro antibacterial activity against four human pathogenic bacteria. Ligands show moderately whereas some of metal chelates show highly antibacterial activity against them.

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Section: Infrared Spectramentioning

confidence: 99%

Section: Electronic Spectramentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Metal Complexes of Schiff Bases Derived from 2-Thiophenecarboxaldehyde and Mono/Diamine as the Antibacterial Agents

Uddin¹

2014

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“…Coordination of the Schiff base to the metal ion through the nitrogen atom is expected to reduce the electron density and so the azomethine frequency shows a decrease in the stretching frequency for the complexes 1, 2, 4, increase in stretching frequency in complex 3, and being shifted to around (1590-1604 cm -1 ), which indicates the coordination of the azomethine nitrogen [14]. The strong to medium bands due to (C-S) stretching vibration of acetyl thiophene ring appeared at 743 cm -1 in the free Schiff base ligand [15,16]. These bands are shifted to 757, 755, 750 and 760 cm -1 in Mn(II), Co(II), Ni(II) and Cu(II) metal complexes.…”

Section: Ir Spectra Of the Schiff Base Ligands And Their Metal (Ii) Cmentioning

confidence: 99%

Synthesis, physicochemical, thermal, fluorescence and catalytic activity studies of novel Mn(II), Co(II), Ni(II) and Cu(II) complexes with tridentate (ONS) Schiff base ligand

et al. 2017

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Syntheses and physicochemical studies of Mn(II), Co(II), Ni(II) and Cu(II) complexes with tridentate Schiff base ligand (E)-2-((1-(thiophen-2-yl)ethylidene)amino)phenol (HL) (ATS) were characterized by elemental analysis, FT-IR, Mass, 1 H NMR, UV-Vis, magnetic moment, thermal analysis (TG and DTG) techniques, molar conductance and fluorescence spectra. The IR spectra showed that complexes were coordinated in metal ions via the imine N, O and S atoms. Magnetic and UV-Vis spectra, indicated that the geometrical structure of Mn(II), Co(II) and Ni(II) complexes are an octahedral while Cu(II) is a tetrahedral. The kinetic thermodynamic parameters such as E*, H*, S* and G* were determined for each thermal degradation stage of TG curves of the metal(II) complexes using Coat-Redfern method. Fluorescence studies indicated that the Schiff base ligand HL (ATS), and its metal(II) complexes can serve as potential photoactive materials as indicated from their characteristic fluorescence properties and study the effect of solvent and pH on it. The catalytic activities of metal(II) complexes were studied using H2O2 solution. KEYWORDSONS donor sites Catalytic activity Thermal analysis Schiff base ligand Metals complexes Fluorescence spectra 2-((1-(Thiophen-2-yl)ethylidene)amino)phenol Cite this: Eur.

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“…Schiff bases are associated with antibacterial, antifungal and antitubercular activities have diverse biological activities [8][9][10][11][12]. The present work includes modification of dapsone drug by synthesis, characterization and antimicrobial study of dapsone Schiff base derivatives.…”

Section: Introductionmentioning

confidence: 99%

Computational study and antimicrobial activity of few Dapsone Schiff base derivatives

2014

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KEYWORDSCondensation of 4,4-diaminodiphenyl sulfone (Dapsone) with aliphatic and aromatic aldehydes yielded a few Schiff base derivatives in good yields. The optimized structural parameters (bond lengths and bond angles) of three azomethine compounds have been obtained by using the GAUSSIAN 09 program package. Conformer of compound 1 has the highest energy, which has less stability than compounds 2 and 3 at the same model. The synthesized compounds were screened for antibacterial activity against Staphylococcus aureus, Escherichia coli, Bacillus subtilis and fungicidal activity against Aspergillus niger and Candida albicans. All compounds exhibited potent antibacterial and antifungal activity with the reference standard ciprofloxacin and Amphotericin B, respectively. DFT Dapsone Schiff base Antimicrobial NMR spectroscopy Computational study

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<b>Potentiometric determination of K<sup>+</sup> ions using a K<sup>+</sup>-selective electrode with macrocyclic liquid membrane</b>

Cited by 5 publications

References 9 publications

Metal Complexes of Schiff Bases Derived from 2-Thiophenecarboxaldehyde and Mono/Diamine as the Antibacterial Agents

Metal Complexes of Schiff Bases Derived from 2-Thiophenecarboxaldehyde and Mono/Diamine as the Antibacterial Agents

Synthesis, physicochemical, thermal, fluorescence and catalytic activity studies of novel Mn(II), Co(II), Ni(II) and Cu(II) complexes with tridentate (ONS) Schiff base ligand

Computational study and antimicrobial activity of few Dapsone Schiff base derivatives

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