2007
DOI: 10.1007/s11243-006-0131-0
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Spectroscopic studies of bridged binuclear complexes of Co(II), Ni(II), Cu(II) and Zn(II)

Abstract: Binuclear cobalt(II), nickel(II), copper(II) and zinc(II) complexes of general composition [M 2 L 1-2 (l-Cl)Cl 2 ] AE nH 2 O with the Schiff-base ligands (where L 1 H and L 2 H are the potential pentadentate ligands derived by condensing 2,6-diformyl-4-methylphenol with 4-amino-3-antipyrine and 2-hydroxy-3-hydrazinoquinoxiline, respectively) have been synthesized and characterized. Analytical and spectral studies support the above formulation. 1 H-NMR and IR spectra of the complexes suggest they have an endoge… Show more

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Cited by 39 publications
(12 citation statements)
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“…The IR spectrum of the free ligand L 2 H shows a medium intensity band at around 3,220-3,340 cm -1 , which is assigned to v(NH) of both pyrazole and amide groups. The sharp bands at 1,648 and 1,622 cm -1 are assigned to v(C=O) of the antipyrine and amide carbonyl functionalities, respectively [19]. Pyrazole ring vibrations v(C=N) are present at 1,577 cm -1 , and formation of imidol is therefore ruled out.…”
Section: Resultsmentioning
confidence: 95%
“…The IR spectrum of the free ligand L 2 H shows a medium intensity band at around 3,220-3,340 cm -1 , which is assigned to v(NH) of both pyrazole and amide groups. The sharp bands at 1,648 and 1,622 cm -1 are assigned to v(C=O) of the antipyrine and amide carbonyl functionalities, respectively [19]. Pyrazole ring vibrations v(C=N) are present at 1,577 cm -1 , and formation of imidol is therefore ruled out.…”
Section: Resultsmentioning
confidence: 95%
“…Since the three dimension-structure of a biopolymer, chitosan can coordinate with the metal ions forming mono or dinuclear units with possible metallic bridges with chlorine atoms. [40][41][42] In this way, tetracoordinated …”
Section: Fourier Transform Infrared Spectroscopymentioning
confidence: 99%
“…The infrared spectroscopic data of the Schiff base ligands L 1 and L 2 show a very strong band at 1,672 and 1,656 cm -1 which may be attributed to the m(C=O) stretching vibration of the antipyrine ring. On complexation these bands are shifted to the lower region 1,630-1,610 cm -1 , showing that carbonyl oxygen is involved in coordination [21]. Also the medium intensity bands at 1,625 and 1,618 cm -1 assignable to the azomethine m(C=N) stretching of L 1 and L 2 are shifted to the region 1,610-1,593 cm -1 , respectively, thereby indicating coordination of azomethine nitrogen atoms [22].…”
Section: Equivalent Conductance Of Chloride Complexes [Comentioning
confidence: 92%
“…spectra of the metal complexes of the ligands in EtOH solution showed a high intensity broad band in the 480-401 nm range which is tentatively assigned to ligand (p)-metal (d) charge-transfer, while the weaker ligand field bands may be obscured by such transitions [19]. The d-d transitions are observed in the visible region [21] (Fig. 2).…”
Section: Equivalent Conductance Of Chloride Complexes [Comentioning
confidence: 92%