Potentiometric, spectroscopic and thermal studies on the metal chelates of 1-(2-thiazolylazo)-2-naphthalenol

Omar, M. M.

doi:10.1016/j.saa.2004.05.040

Cited by 122 publications

(30 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In conclusion, the most probable hypothesis about the deprotonations leading to the formation of ML 2 , ML 2 H )1 , ML 2 H )2 , ML 2 H )4 complexes may be the successive deprotonations of already bound water molecules. The systems M(L 1 ) 2 give complexes more stable than those of ML 2 due to the electron-donor effect of the diazo group of H 2 L 1 favorable to coordination [17]. Thus, stabilities of the complexes formed by H 2 L 1 with Cu 2+ , Ni 2+ , Co 2+ and Zn 2+ are higher than the corresponding stabilities of H 2 L complexes.…”

Section: Stability Constants Of Complexesmentioning

confidence: 95%

Dissociation constants of some Schiff bases and stability constants of their copper, cobalt, nickel and zinc complexes

Tunçel

Sarı

2007

Transition Met Chem

View full text Add to dashboard Cite

The stoichiometry and stability constant of metal complexes with 4-(3-methoxy-salicylideneamino)-5-hydroxynaphthalene-2,7-disulfonic acid monosodium salt (H 2 L) and 4-(3-methoxysalicylideneamino)-5-hydroxy-6-(2,5-dichlorophenylazo)-2,7-naphthalene disulfonic acid monosodium salt (H 2 L 1 ) were studied by potentiometric titration. The stability constants of H 2 L and H 2 L 1 Schiff bases have been investigated by potentiometric titration and u.v.-vis spectroscopy in aqueous media. The dissociation constants of the ligand and the stability constants of the metal complexes were calculated pH-metrically at 25°C and 0.1 M KCl ionic strength. The dissociation constants for H 2 L were obtained as 3.007, 7.620 and 9.564 and for H 2 L 1 , 4.000, 6.525, 9.473 and 10.423, respectively. The complexes were found to have the formulae [M(L) 2 ] for M = Co(II), Ni(II), Zn(II) and Cu(II). The stability of the complexes follows the sequence: Zn(II) < Co(II) < Cu(II) < Ni(II). The high stability of H 2 L 1 towards Cu(II) and Ni(II) over the other ions is remarkable, in particular over Cu(II), and may be of technological interest. Concentration distribution diagram of various species formed in solution was evaluated for ligands and complexes. The formation of the hydrogen bonds may cause this increased stability of ligands. The pH-metric data were used to find the stoichiometry, deprotonation and stability constants via the SUPERQUAD computer program.

show abstract

Section: Stability Constants Of Complexesmentioning

confidence: 95%

Dissociation constants of some Schiff bases and stability constants of their copper, cobalt, nickel and zinc complexes

Tunçel

Sarı

2007

Transition Met Chem

View full text Add to dashboard Cite

show abstract

“…4 T 1g (P)) transitions suggestive of octahedral geometry which is also supported by its magnetic moment value (4.71 B.M.) [37].…”

Section: Electronic Absorption Spectra and Magnetic Momentmentioning

confidence: 52%

Synthesis and spectral studies on metal complexes of s-triazine based ligand and non linear optical properties

Shanmugakala

Tharmaraj²,

Sheela

2014

Journal of Molecular Structure

View full text Add to dashboard Cite

“…Such an interaction decreases the dissociation process of rhodanine, i.e. increases the pK H value [30,31]. The formation curves for the metal complexes were obtained by plotting the average number of ligands attached per metal ion (n A ) vs. the free ligand exponent (pL), according to Irving and Rossotti [32].…”

Section: Potentiometric Studiesmentioning

confidence: 99%

Spectroscopic, potentiometric and thermodynamic studies of azo rhodanines and their metal complexes

El‐Sonbati

El-Bindary

El-Meksoud

et al. 2014

Journal of Molecular Liquids

View full text Add to dashboard Cite

Potentiometric, spectroscopic and thermal studies on the metal chelates of 1-(2-thiazolylazo)-2-naphthalenol

Cited by 122 publications

References 28 publications

Dissociation constants of some Schiff bases and stability constants of their copper, cobalt, nickel and zinc complexes

Dissociation constants of some Schiff bases and stability constants of their copper, cobalt, nickel and zinc complexes

Synthesis and spectral studies on metal complexes of s-triazine based ligand and non linear optical properties

Spectroscopic, potentiometric and thermodynamic studies of azo rhodanines and their metal complexes

Contact Info

Product

Resources

About