Preparation and Physical Properties of Co(II), Ni(II) and Cu(II) Complexes of Schiff Bases Derived from Chromdne with<u>o</u>-Substituted Anilines

El-Gaber, A. A. Abd; Hassaan, Aly M. A.; El-Shabasy, M.; El‐Roudi, A. M.

doi:10.1080/15533179108020222

Cited by 16 publications

(3 citation statements)

References 16 publications

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“…[25]; H 2 O was distilled twice. The Schiff bases were prepared by condensation of 5,7-dihydroxy-6-formyl-2-methylbenzopyran-4-one [26] with substituted anilines in absolute alcohol for at least one hour except for 4-amino-3-hydroxybenzenesulfonic acid which is insoluble in ethanol. It was dissolved in 4% (w/w) NaOH, and the resulting Schiff base was precipitated by acidi®cation to pH 2.4 with dilute acetic acid.…”

Section: Methodsmentioning

confidence: 99%

Chelation Behaviour of Ce(III), Th(IV), and UO2(VI) with 5,7-Dihydroxy-6-formyl-2-methylbenzopyran-4-one Schiff Bases

Issa¹,

Sherif²,

Abbas³

1998

Monatshefte fuer Chemie

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The stability constants of the stepwise chelate formation between Ce 3 , Th 4 , and UO 2 2 ions and some Schiff bases derived from 5,7-dihydroxy-6-formyl-2-methylbenzopyran-4-one were determined conductometrically as well as potentiometrically applying the Irving and Rossotti techniques. The results indicate the formation of 1:1 and 1:2 (M:L) chelates. The stability constants increase with decreasing ionic strength, decreasing temperature, and decreasing percentage of ethanol. In different organic solvents (70% v/v solvent-water media), the stability constant values follow the order MeOH < EtOH < 1-propanol < 2-propanol < acetone < DMSO depending on both the dielectric constant and the hydrogen bonding structure of the medium. The thermodynamic parameters (ÁG, ÁH, and ÁS) were calculated; they indicate that the chelate formation is an exothermic process and that the degree of disorder of the solution increases upon chelation.Das Chelierungsverhalten von Ce 3 , Th 4 und UO 2 2 mit Schiffschen Basen vom Typ 5,7-Dihydroxy-6-formyl-2-methylbenzopyran-4-on Zusammenfassung. Die Stabilita Ètskonstanten fu Èr die stufenweise Chelatbildung von Ce 3 -, Th 4 -und UO 2 2 -Ionen mit von 5,7-Dihydroxy-6-formyl-2-methylbenzopyran-4-onen abgeleiteten Schiffschen Basen wurden konduktometrisch und potentiometrisch mit Hilfe der Irving-Rossotti-Technik bestimmt. Die Ergebnisse zeigen die Bildung von 1:1-und 1:2-Chelaten (M:L) an. Die Stabilita Èkonstanten steigen mit steigender Ionensta Èrke, abnehmender Temperatur und abnehmendem Anteil von Ethanol. In verschiedenen organischen Lo Èsungsmitteln (70% v/v Lo Èsungsmittel-WasserGemische) folgen die Stabilita Ètskonstanten der Reihe MeOH < EtOH < 1-Propanol < 2-Propanol < Aceton < DMSO, ha Èngen also sowohl von der Dielektrizita Ètskonstante als auch von der Wasserstoffbru Èckenbindungsstruktur des Mediums ab. Die thermodynamischen Parameter (ÁG, ÁH und ÁS) wurden bestimmt; sie weisen darauf hin, daû die Bildung solcher Chelate exotherm verla Èuft und daû und der Unordnungsgrad der Lo Èsung bei der Chelierung steigt.

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Section: Methodsmentioning

confidence: 99%

Chelation Behaviour of Ce(III), Th(IV), and UO2(VI) with 5,7-Dihydroxy-6-formyl-2-methylbenzopyran-4-one Schiff Bases

Issa¹,

Sherif²,

Abbas³

1998

Monatshefte fuer Chemie

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“…[4][5][6][7][8] Metal complexes of Schiff bases derived from sali-1264 BISWAS, BRAHMAN and SINHA cylaldehyde and various amines have been widely investigated. [9][10][11][12][13] Among the first row transition metals, copper plays a pivotal role in cell physiology as a catalytic cofactor in the redox chemistry of mitochondrial respiration, iron absorption, free radical scavenging, and elastin cross-linking. 14 Cu(II) complexes show distorted octahedral and tetrahedral symmetries due to their d 9 configuration (Jahn-Teller effect).…”

Section: Introductionmentioning

confidence: 99%

Spectrophotometric and conductometric study of the complexation of N-salicylidene-2-aminophenol with Cu2+ in methanol + 1,4-dioxane binary solutions

Biswas

Brahman

Sinha

2014

JSCS

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The complexation reaction between N-salicylidene-2-aminophenol, abbreviated as SAP, with Cu2+ ion was studied in binary mixtures of methanol and 1,4-dioxane by using conductometric and spectrophotometric method at different temperatures. The stability constants (Kf) for the 1:1 complex, Cu2+-SAP, were calculated from computer fitting of absorbance and molar conductance data against various mole ratios (cM:cL or cL:cM) in different binary solvent mixtures. A non-linear behaviour was observed for the variation of logKf for the complex against the solvent compositions. Various thermodynamic parameters (?H, ?S and ?G) for the formation of Cu2+-SAP complex were determined from the temperature dependence of stability constants (Kf). The overall results showed that the complexation reaction is entropy driven and is affected by the nature and composition of the mixed solvents.

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“…In addition, the presence of both a hard and a soft donor group in one ligand increases the coordination ability towards hard as well as soft acidic metals. Metal complexes of Schiff bases derived from salicylaldehyde and various amines have been widely investigated [9,10]. The salicylaldehyde-thio-Schiff bases have recently acquired considerable importance due to their chemical and especially their promising biological properties [11,12].…”

Section: Introductionmentioning

confidence: 99%

Photochemical reactions of M(CO)5THF (M = Cr, Mo, W) with thio Schiff bases

Karahan

Kose

Subaşı

et al. 2008

Transition Met Chem

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The hitherto unknown complexes, [M 2 (CO) 6 -(l-CO)(l-L)], [M = Cr; 1, Mo; 2, W; 3] and [M 2 (CO) 6 -(l-CO)(l-L 0 )], [M = Cr; 4, Mo; 5, W; 6] have been synthesized by the photochemical reactions of photogenerated intermediate, M(CO) 5 THF (M = Cr, Mo, W) with thio Schiff base ligands, N,N 0 -bis(2-aminothiophenol)-1,4-bis(2-carboxaldehydephenoxy)butane (H 2 L) and N,N 0 -bis(2-aminothiophenol)-1,7-bis(2-formylphenyl)-1,4,7-trioxaheptane (H 2 L 0 ). The complexes have been characterized by elemental analysis, LC-mass spectrometry, magnetic studies, FT-IR and 1 H NMR spectroscopy. The spectroscopic studies show that H 2 L and H 2 L 0 ligands are converted to benzothiazole derivatives, L and L 0 after UV irradiation and coordinated to the central metal as bridging ligands via the central azomethine nitrogen and sulphur atoms in 1-6.

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Preparation and Physical Properties of Co(II), Ni(II) and Cu(II) Complexes of Schiff Bases Derived from Chromdne witho-Substituted Anilines

Cited by 16 publications

References 16 publications

Chelation Behaviour of Ce(III), Th(IV), and UO2(VI) with 5,7-Dihydroxy-6-formyl-2-methylbenzopyran-4-one Schiff Bases

Chelation Behaviour of Ce(III), Th(IV), and UO2(VI) with 5,7-Dihydroxy-6-formyl-2-methylbenzopyran-4-one Schiff Bases

Spectrophotometric and conductometric study of the complexation of N-salicylidene-2-aminophenol with Cu2+ in methanol + 1,4-dioxane binary solutions

Photochemical reactions of M(CO)5THF (M = Cr, Mo, W) with thio Schiff bases

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