Stability of bivalent metal complexes with Schiff's bases derived from salicylaldehyde

Shori, Nisha; Dutt, Yag; Singh, Vikram

doi:10.1016/0022-1902(72)80554-2

Cited by 11 publications

(4 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…III. 21,22 The magnetic and spectroscopic properties of these classes of complex have been studied, 23, 24 and they have substantial biological relevance, 25-27 but comparatively little synthetic chemistry has been reported. 28 More recently we noted the application of classes of complex I in homogeneous catalysis of alkene cyclopropanation 12, 14 and alkane oxidation to alcohols.…”

Section: Introductionmentioning

confidence: 99%

Chirality and diastereoselection in the μ-oxo diiron complexes L2Fe–O–FeL2 (L = bidentate salicylaldiminato)

et al. 2010

View full text Add to dashboard Cite

A number of bis(salicylaldiminato) (Schiff base) complexes of Fe(II) i.e. L(2)Fe with a variety of ligand substituents and functionality are synthesised, usually by salt metathesis but on one occasion via the (sal)(2)Fe complex, and characterised by standard methods. Two molecular structure determinations indicate the expected tetrahedral geometry. Treatment with dry oxygen yielded the Fe(III) complexes [(FeL(2))(2)-mu-O], generally in high yield and in the absence of hydroxylated impurities; one bulky complex L(2)Fe gave no oxidation product for steric reasons, and one hydroxyl-substituted compound gave an insoluble product. Five molecular structures of these [(FeL(2))(2)-mu-O] compounds were determined. All were homochiral in the sense that the absolute configuration at Fe was the same for both atoms. Three of the structures - those based on optically pure salicylaldimine ligands - were diastereomeric. For two, the diastereomers observed are those predicted on the basis of steric considerations, while a third highly distorted and congested structure represents the unexpected diastereomer. Powder X-ray diffraction confirms high phase purity of the bulk samples (i.e. they are diastereomerically pure to the level detectable). These investigations, coupled with molecular structure and NMR studies on model gallium complexes, indicate that the diastereoselection arises from cooperative interactions across the oxo bridge.

show abstract

Section: Introductionmentioning

confidence: 99%

Chirality and diastereoselection in the μ-oxo diiron complexes L2Fe–O–FeL2 (L = bidentate salicylaldiminato)

et al. 2010

View full text Add to dashboard Cite

show abstract

“…It can thus be speculated that the hydrogen bonds here play a crucial role to provide enough resistance toward hydrolysis of the imines like the metal coordination by Schiff bases. 38 It is clear from the above-mentioned results that the observed emission enhancement in the presence of water is not really AIE of the molecule but originated from the aldehydes in the cases of 1−15. However, one question remained unanswered, why the emission enhanced with increase in water content.…”

Section: ■ Results and Discussionmentioning

confidence: 88%

“…Crystal structures of both 20 and 21 were previously reported. , Analyzing both the structures indeed showed strong hydrogen bonds between the hydroxyl and nitrogen of the imine (1.839–1.889 Å) in both cases. It can thus be speculated that the hydrogen bonds here play a crucial role to provide enough resistance toward hydrolysis of the imines like the metal coordination by Schiff bases …”

Section: Resultsmentioning

confidence: 99%

Aggregation-Induced Emission or Hydrolysis by Water? The Case of Schiff Bases in Aqueous Organic Solvents

Pramanik

Das

2018

J. Phys. Chem. C

View full text Add to dashboard Cite

In the last two decades, several Schiff bases have been reported as AIEgens which remain nonemissive in organic solvents but show strong fluorescence in the presence of water. A methodical analysis involving 21 Schiff bases, including some of the reported molecules, shows that in the presence of water, the Schiff bases hydrolyze to yield the corresponding starting aldehydes and amines. The observed emission in the presence of water is found to be originated from the aggregation of the fluorogenic aldehydes and not of the original molecules. Thus, while the aggregation-induced emission (AIE) effect is valid for these systems, certainly, these Schiff bases cannot be termed as AIEgens. Notably, the observation that these aldehydes can act as AIEgens through their excimer emission is an important phenomenon with respect to the current understanding of AIEgens.

show abstract

“…The Schiff bases were found to be powerful extractants for metal ions in recent years [17][18][19][20][21][22][23][24][25][26][27] . A major feature of these extractants was its high sensitivity for transition metal ions and structural rigidity [28][29][30][31][32][33][34][35] . Besides, Schiff bases are well known as organic compounds that can be readily synthesized from inexpensive starting materials.…”

Section: Introductionmentioning

confidence: 99%

Equilibrium Studies on the Synergic Liquid‐Liquid Extraction Process of Copper(II) from Sulphate Media with Mixtures of some Bidentate Mono‐Schiff Bases and Acyclic Polyether Non‐ionic Surfactant in Chloroform

Youcef

Benabdallah

Ilikti

et al. 2008

Solvent Extraction and Ion Exchange

View full text Add to dashboard Cite

The liquid-liquid extraction of copper(II) with bidentate mono-Schiff base extractants(HL), namely, N-salicylideneaniline (SA), N-(2-hydroxy-1-naphthalidene)aniline (HNA), N-salicylidene-1-naphthylamine (SN), and N-(2-hydroxy-1-naphthalidene)-1-naphthylamine (HNN), from a weakly acidic sulphate media into chloroform was studied in both the absence and the presence of acyclic polyether non-ionic surfactant (S). In the absence of the non-ionic surfactant, the extractability of copper(II) was 92.6% with SA, 89% with HNA, 81% with SN, and 80% with HNN. The estimated extraction constants, (log K ex ) of the four extractants revealed that the extraction efficiency increased in the order HNN, SN, HNA,SA. Besides, it was found that copper(II) was extracted as CuL 2 (HL) with SA and HNA, and as CuL 2 with SN and HNN. The extraction of copper(II) was significantly enhanced with HL into chloroform upon the addition of a non-ionic surfactant. An extractability of 100% was reached. The stoichiometry of the extracted complexes was CuL 2 S. The synergic extraction ability of extractants changed in the order SA.HNA.SN,HNN, whereas, the synergic effect fell in the order HNN.SN.HNA,SA.

show abstract

Stability of bivalent metal complexes with Schiff's bases derived from salicylaldehyde

Cited by 11 publications

References 5 publications

Chirality and diastereoselection in the μ-oxo diiron complexes L2Fe–O–FeL2 (L = bidentate salicylaldiminato)

Chirality and diastereoselection in the μ-oxo diiron complexes L2Fe–O–FeL2 (L = bidentate salicylaldiminato)

Aggregation-Induced Emission or Hydrolysis by Water? The Case of Schiff Bases in Aqueous Organic Solvents

Equilibrium Studies on the Synergic Liquid‐Liquid Extraction Process of Copper(II) from Sulphate Media with Mixtures of some Bidentate Mono‐Schiff Bases and Acyclic Polyether Non‐ionic Surfactant in Chloroform

Contact Info

Product

Resources

About