Stereochemistry of new nitrogen containing heterocyclic aldehyde. IX. Spectroscopic studies on novel mixed-ligand complexes of Rh(III)

El‐Sonbati, A.Z.; El-Bindary, A.A.; Al-Sarawy, A. A.

doi:10.1016/s1386-1425(02)00021-5

Cited by 36 publications

(10 citation statements)

References 20 publications

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“…This can be attributed to delocalisation of metal electron density (t 2 g ) to the p-system of the ligand [15,19]. The m(C=N) stretching of pyridine at 1,596 cm -1 in the free Schiff-base is shifted to higher frequency and observed around 1,606-1,623 cm -1 for the polymeric complexes, indicating coordination of nitrogen of the C=N pyridine moieties to the metal atoms [20]. Further, bands in the region of 1,522-1,562 cm -1 in all the complexes suggest phenoxide bridging with the metal atoms [21,22].…”

Section: Resultsmentioning

confidence: 97%

Formation of polymeric chain assemblies of transition metal complexes with a multidentate Schiff-base

Al-Jeboori

Hasan

Al-Sa’idy

2009

Transition Met Chem

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The new multidentate Schiff-base (E)-6, 6 0 -((1E,1 0 E)-(ethane-1,2-diylbis(azan-1-yl-1-ylidene))bis-(methan-1-yl-ylidene))bis(4-methyl-2-((E)(pyridine-2-ylmethylimino)methyl)phenol) H 2 L and its polymeric binuclear metal complexes with Cr(III), Mn(II), Fe(II), Co(II), Ni(II), Cu(II), Zn(II), Cd(II) and Hg(II) are reported. The reaction of 2,6-diformyl-4-methyl-phenol with ethylenediamine in mole ratios of 2:1 gave the precursor 3,3 0 -(1E,1 0 E)-(ethane-1,2-diylbis(azan-1-yl-1ylidene))bis-(methan-1-yl-1-ylidene)bis(2-hydroxy-5-methylbenzaldehyde) W. Condensation of the precursor with 2-(amino-methyl)-pyridine in mole ratios of 1:2 gave the new N 6 O 2 multidentate Schiff-base ligand H 2 L. Upon complex formation, the ligand behaves as a dibasic octadentate species with the involvement of the nitrogen atoms of the pyridine groups in coordination for all complexes. The mode of bonding and overall geometry of the complexes were determined through physico-chemical and spectroscopic methods. These studies revealed octahedral geometries for Cr(III),

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Section: Resultsmentioning

confidence: 97%

Formation of polymeric chain assemblies of transition metal complexes with a multidentate Schiff-base

Al-Jeboori

Hasan

Al-Sa’idy

2009

Transition Met Chem

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“…The bands are assigned to a ν (C=N) stretch of reduced bond order. This can be attributed to delocalisation of metal electron density ( t 2 g ) to the π -system of the ligand [19, 20], indicating coordination of nitrogen of the C=N moieties to the metal atoms [21]. In addition, the IR spectra of the complexes display peaks around 1620 cm −1 , which may be attributed to the ν (C=N) imine stretching of the uncoordinated moieties.…”

Section: Resultsmentioning

confidence: 99%

Metal Complexes of Macrocyclic Schiff-Base Ligand: Preparation, Characterisation, and Biological Activity

Ahmed

Yousif

Hasan

et al. 2013

The Scientific World Journal

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A new macrocyclic multidentate Schiff-base ligand Na4L consisting of two submacrocyclic units (10,21-bis-iminomethyl-3,6,14,17-tricyclo[17.3.1.18,12]tetracosa-1(23),2,6,8,10,12(24),13,17,19,21,-decaene-23,24-disodium) and its tetranuclear metal complexes with Mn(II), Co(II), Ni(II), Cu(II), and Zn(II) are reported. Na4L was prepared via a template approach, which is based on the condensation reaction of sodium 2,4,6-triformyl phenolate with ethylenediamine in mole ratios of 2 : 3. The tetranuclear macrocyclic-based complexes were prepared from the reaction of the corresponding metal chloride with the ligand. The mode of bonding and overall geometry of the compounds were determined through physicochemical and spectroscopic methods. These studies revealed tetrahedral geometries about Mn, Co, and Zn atoms. However, square planar geometries have been suggested for NiII and CuII complexes. Biological activity of the ligand and its metal complexes against Gram positive bacterial strain Staphylococcus aureus and Gram negative bacteria Escherichia coli revealed that the metal complexes become more potentially resistive to the microbial activities as compared to the free ligand. However, these metal complexes do not exhibit any effects on the activity of Pseudomonas aeruginosa bacteria. There is therefore no inhibition zone.

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“…These bands are assigned to a ν (C=O) and ν (C=N) stretches of reduced bond order. This can be attributed to delocalisation of metal electron density ( t 2 g ) to the π -system of the ligand [25, 26], indicating coordination of oxygen of C=O and nitrogen of the C=N moieties to the metal atoms [27]. The bands of ν (C–O) at ca.…”

Section: Resultsmentioning

confidence: 99%

Co(II) and Cd(II) Complexes Derived from Heterocyclic Schiff-Bases: Synthesis, Structural Characterisation, and Biological Activity

Ahmed

Yousif

Al-Jeboori

2013

The Scientific World Journal

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New monomeric cobalt and cadmium complexes with Schiff-bases, namely, N′-[(E)-(3-hydroxy-4-methoxyphenyl)methylidene]furan-2-carbohydrazide (L1) and N′-[(E)-(3-hydroxy-4-methoxyphenyl)methylidene]thiophene-2-carbohydrazide (L2) are reported. Schiff-base ligands L1 and L2 were derived from condensation of 3-hydroxy-4-methoxybenzaldehyde (iso-vanillin) with furan-2-carboxylic acid hydrazide and thiophene-2-carboxylic acid hydrazide, respectively. Complexes of the general formula [M(L)2]Cl2 (where M = Co(II) or Cd(II), L = L1 or L2) have been obtained from the reaction of the corresponding metal chloride with the ligands. The ligands and their metal complexes were characterised by spectroscopic methods (FTIR, UV-Vis, 1H, and 13C NMR spectra), elemental analysis, metal content, magnetic measurement, and conductance. These studies revealed the formation of four-coordinate complexes in which the geometry about metal ion is tetrahedral. Biological activity of the ligands and their metal complexes against gram positive bacterial strain Bacillus (G+) and gram negative bacteria Pseudomonas (G−) revealed that the metal complexes become less resistive to the microbial activities as compared to the free ligands.

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Stereochemistry of new nitrogen containing heterocyclic aldehyde. IX. Spectroscopic studies on novel mixed-ligand complexes of Rh(III)

Cited by 36 publications

References 20 publications

Formation of polymeric chain assemblies of transition metal complexes with a multidentate Schiff-base

Formation of polymeric chain assemblies of transition metal complexes with a multidentate Schiff-base

Metal Complexes of Macrocyclic Schiff-Base Ligand: Preparation, Characterisation, and Biological Activity

Co(II) and Cd(II) Complexes Derived from Heterocyclic Schiff-Bases: Synthesis, Structural Characterisation, and Biological Activity

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