Macrocyclic complexes: Synthesis and characterization

Singh, Dharmpal; Kumar, Krishan

doi:10.2298/jsc1000028s

Cited by 6 publications

(13 citation statements)

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“…However, this band was not observed in the present study. The complexes (8) and (9) In the present investigation, the complexes (10-14) exhibited a high intensity broad band centered at approximately 360 nm, probably due to the d xy →d z 2 transition that suggested a square-pyramidal geometry [18].…”

Section: Magnetic Moment and Electronic Spectramentioning

confidence: 49%

“…5 cm -1 ) than the corresponding ligands. This may be explained by a drift of the lone pair electron density of the azomithine nitrogen towards the iron atom [10,13,18], which indicated the coordination through the azomithine nitrogen atom. The appearance of a broad band in the range of 3465-3427 cm -1 indicated the presence of ν O-H of hydrated water molecule in the complexes [19,20].…”

Section: Infrared Spectramentioning

confidence: 99%

“…Fresh bands at 526-529 cm -1 and 507-495 cm -1 may be assigned to the ν(Fe-N) and ν(Fe-O) stretching modes, which also provided information for the formation of the complexes through the azomithine nitrogen and deprotonated amidic oxygen atoms respectively [10,13,19,20]. Moreover, the complexes also exhibited various strong bands from 1588-1409 cm -1 and from 1264-1251 cm -1 assigned to the aromatic ν C=C and ethereal ν C-O-C stretches respectively [10,16,18]. …”

Section: Infrared Spectramentioning

confidence: 99%

“…The observed magnetic moment values are listed in Table 1. The magnetic moment of complexes (8) and (9) [23], suggestive to five coordinated square-pyramidal geometry around the metal center [18]. The electronic spectra of the complexes were recorded on a T60U spectrophotometer using 10 -5 M solution in DMSO.…”

Section: Magnetic Moment and Electronic Spectramentioning

confidence: 99%

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Structural Evaluation and Antibacterial Sensitivity of Iron (III) Complexes of 4-<i>n</i>-hexyloxybenzoylhydrazine with Some Aliphatic and Aromatic

et al. 2012

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The condensation reaction of N-alkylidene or N-arylidene-(4-n-hexyloxy)benzoylhydrazone [L] (1-7) where, R= formaldehyde (1), acetaldehyde (2), butyraldehyde (3), cinnamaldehyde (4), 4-N,N-dimethylaminobenzaldehyde (5), 2-hydroxybenzaldehyde (6) and 4-methoxybenzaldehyde (7) (11-14) were obtained by the direct reaction of the Schiff's bases with Fe 3+ ion. The complexes were characterized by magnetic moment measurement, UV-visible, infrared, 1 H-NMR and TGA (Thermo gravimetric analysis) studies. The Schiff's bases containing small alkyl group at the hydrazine moiety formed octahedral complexes, while the bulky/aryl/substituted aryl moiety, yielded five coordinated square-pyramidal complexes. The complexes were found to be quite stable and decomposition of the complexes ended with ferric oxide as final product. Complexes (10) and (13) showed no activity against all the bacteria. Complexes (8), (9) and (12) showed resistance while the complex (14) manifested intermediate antibacterial activity.

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Section: Magnetic Moment and Electronic Spectramentioning

confidence: 49%

Section: Infrared Spectramentioning

confidence: 99%

Section: Infrared Spectramentioning

confidence: 99%

Section: Magnetic Moment and Electronic Spectramentioning

confidence: 99%

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Structural Evaluation and Antibacterial Sensitivity of Iron (III) Complexes of 4-<i>n</i>-hexyloxybenzoylhydrazine with Some Aliphatic and Aromatic

et al. 2012

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“…metal siloxides containing Si–O–M linkages) or through the attached organic chelating functions 4–6. Diverse organic hydrophilic groups able to act as a chelating agent for metals can be attached to the hydrophobic diorganosiloxane moiety that can extend the application range of the products from high‐performance materials to pharmaceuticals 7…”

Section: Introductionmentioning

confidence: 99%

A Bis(pyrrole) Schiff Base Containing a Flexible Siloxane Bridge and Its Ni^II Complex

Vlad¹,

Turta

Cazacu³

et al. 2012

Eur J Inorg Chem

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A Schiff base, H 2 L, containing a siloxane bridge was prepared by condensation of pyrrole-2-carboxaldehyde with a siloxane diamine, 1,3-bis(3-aminopropyl)tetramethyldisiloxane. The proper nickel(II) complex, NiL, was obtained by in situ generation of the ligand in the presence of nickel chloride. The synthesized compounds were characterized by elemental analysis and common spectroscopic (FTIR, 1 H NMR,[a] "Petru

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Structural characterization, thermal investigation and biological activity of metal complexes containing Schiff Base ligand (Z)‐3‐(1‐((4,6‐dimethyl‐1H‐pyrazolo[3,4‐b] pyridin‐3‐yl)imino)ethyl)‐4‐hydroxy‐6‐methyl‐2H‐pyran‐2‐one

Emam

Abouel‐Enein

Abdel‐Satar

2019

Applied Organom Chemis

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A new series of metal complexes containing Co(II), Pd(II), Fe(III) chloride and Cu(II) salts (chloride, bromide, sulphate and perchlorate) have been prepared with Schiff base ligand (HL). The synthesized compounds were elucidated using elemental analyses, spectral techniques, molar conductance, magnetic measurements and thermogravimetric studies. The analytical data established (1 M:1 L) stoichiometry for complexes (1), (2), (4), (6) and (7) as well as (1 M:2 L) and (2 M:3 L) stoichiometry for complexes (5) and (3), respectively. As a result, the ligand HL coordinates in complexes (1), (2), (4), (6) as a monobasic tridentate ONN moiety via the oxygen atom of the deprotonated phenolic OH, the nitrogen atoms of the azomethine and the imine group in pyrazolopyridine ring. While, it behaves as a neutral bidentate in complexes (3,7), chelates via oxygen and nitrogen atoms of enolic OH and azomethine groups. Also, in complex (5) Cu2+ ion binds via NO sits of two ligand molecules in its monobasic and neutral forms. The magnetic moment and electronic spectral data proposed octahedral structure for complexes (2, 3 and 7) as well as triagonal bipyramidal and square pyramidal geometry for complexes (1 and 4), while, chelates (5) and (6) possess square planar geometry. TG/DTG studies confirmed the chemical formula for these complexes and established the thermal decomposition processes ended with the formation of metal or metal oxides contaminated with carbon residue. An axial electron spin resonance spectra were suggested for Cu(II) complexes pointing to 2B1g as a ground state with hyperfine structure for complex (4). In vitro antibacterial and antioxidant activities were performed for HL ligand and its metal complexes. The biological studies indicate that complex (3) has better antibacterial activity compared to the ligand and the other complexes.

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Macrocyclic complexes: Synthesis and characterization

Cited by 6 publications

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Structural Evaluation and Antibacterial Sensitivity of Iron (III) Complexes of 4-<i>n</i>-hexyloxybenzoylhydrazine with Some Aliphatic and Aromatic

Structural Evaluation and Antibacterial Sensitivity of Iron (III) Complexes of 4-<i>n</i>-hexyloxybenzoylhydrazine with Some Aliphatic and Aromatic

A Bis(pyrrole) Schiff Base Containing a Flexible Siloxane Bridge and Its Ni^II Complex

Structural characterization, thermal investigation and biological activity of metal complexes containing Schiff Base ligand (Z)‐3‐(1‐((4,6‐dimethyl‐1H‐pyrazolo[3,4‐b] pyridin‐3‐yl)imino)ethyl)‐4‐hydroxy‐6‐methyl‐2H‐pyran‐2‐one

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Macrocyclic complexes: Synthesis and characterization

Cited by 6 publications

References 0 publications

Structural Evaluation and Antibacterial Sensitivity of Iron (III) Complexes of 4-<i>n</i>-hexyloxybenzoylhydrazine with Some Aliphatic and Aromatic

Structural Evaluation and Antibacterial Sensitivity of Iron (III) Complexes of 4-<i>n</i>-hexyloxybenzoylhydrazine with Some Aliphatic and Aromatic

A Bis(pyrrole) Schiff Base Containing a Flexible Siloxane Bridge and Its NiII Complex

Structural characterization, thermal investigation and biological activity of metal complexes containing Schiff Base ligand (Z)‐3‐(1‐((4,6‐dimethyl‐1H‐pyrazolo[3,4‐b] pyridin‐3‐yl)imino)ethyl)‐4‐hydroxy‐6‐methyl‐2H‐pyran‐2‐one

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A Bis(pyrrole) Schiff Base Containing a Flexible Siloxane Bridge and Its Ni^II Complex