Salicylaldehyde

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Mutlaq S. Aljahdali - One of the best experts on this subject based on the ideXlab platform.

  • review protonation complex formation equilibria and metal ligand interaction of Salicylaldehyde schiff bases
    Journal of Coordination Chemistry, 2013
    Co-Authors: Ahmed A Elsherif, Mutlaq S. Aljahdali
    Abstract:

    Schiff bases (SBs) are aldehyde- or ketone-like compounds in which the carbonyl group is replaced by an imine or azomethine. In spite of the large interest always shown in the coordination properties of Schiff base ligands and the attention paid in recent years to the possible variable biological activities of their metal complexes, studies dealing with protonation and formation equilibria of Schiff bases and their complexes are still very rare. Thus, the importance of the determination of the equilibrium constants of Schiff bases and their complex formation equilibria is of paramount importance to understand the complicated biological reactions like transamination, racemization and decarboxylation. The 33 ligands considered herein include Salicylaldehyde/substituted Salicylaldehyde SBs and Salicylaldehyde/substituted Salicylaldehyde amino acid SBs. This article is focused on protonation and complex-formation equilibria of Salicylaldehyde or substituted Salicylaldehyde SBs and Salicylaldehyde amino acid S...

  • Review: protonation, complex-formation equilibria, and metal–ligand interaction of Salicylaldehyde Schiff bases
    Journal of Coordination Chemistry, 2013
    Co-Authors: Ahmed A. El-sherif, Mutlaq S. Aljahdali
    Abstract:

    Schiff bases (SBs) are aldehyde- or ketone-like compounds in which the carbonyl group is replaced by an imine or azomethine. In spite of the large interest always shown in the coordination properties of Schiff base ligands and the attention paid in recent years to the possible variable biological activities of their metal complexes, studies dealing with protonation and formation equilibria of Schiff bases and their complexes are still very rare. Thus, the importance of the determination of the equilibrium constants of Schiff bases and their complex formation equilibria is of paramount importance to understand the complicated biological reactions like transamination, racemization and decarboxylation. The 33 ligands considered herein include Salicylaldehyde/substituted Salicylaldehyde SBs and Salicylaldehyde/substituted Salicylaldehyde amino acid SBs. This article is focused on protonation and complex-formation equilibria of Salicylaldehyde or substituted Salicylaldehyde SBs and Salicylaldehyde amino acid S...

John D Ranford - One of the best experts on this subject based on the ideXlab platform.

  • synthesis characterization and physicochemical properties of copper ii complexes containing Salicylaldehyde semicarbazone
    Polyhedron, 2003
    Co-Authors: Changtong Yang, Jagadese J. Vittal, John D Ranford
    Abstract:

    Abstract Copper(II) complexes containing a series of Salicylaldehyde semicarbazone ligands have been prepared and characterized by a range of physicochemical techniques. The X-ray structure of [Cu(HBnz2)Cl]·H2O (5) (where HBnz2 is Salicylaldehyde-N,N-dibenzyl semicarbazone) shows the complex is monomeric and the copper atom is four coordinated in a distorted square planar geometry. The ligand chelates the copper in a tridentate fashion through the imine N, carbonyl O and phenolato O with the fourth position being occupied by coordinated Cl. The compound [Cu(Ph2)·H2O] (4) (where Ph2 is Salicylaldehyde-N,N-diphenyl semicarbazone) is also formulated as a monomer whereas all other complexes are assumed to have a side-by-side dimeric arrangement of the metal chelating with the phenolate bridging the Cu(II) centres.

Paolo Lunghi - One of the best experts on this subject based on the ideXlab platform.

  • synthesis structural characterization and biological activity of helicin thiosemicarbazone monohydrate and a copper ii complex of Salicylaldehyde thiosemicarbazone
    Inorganica Chimica Acta, 1999
    Co-Authors: Belicchi M Ferrari, Silvia Capacchi, Giorgio Pelosi, G Reffo, Pieralberto Tarasconi, Roberto Albertini, Silvana Pinelli, Paolo Lunghi
    Abstract:

    Abstract Two new compounds, helicin (i.e. Salicylaldehyde-β- d -glycoside) thiosemicarbazone monohydrate, Het·H2O (1), and bis[aqua(Salicylaldehyde thiosemicarbazonato)copper(II)]sulfate bisdimethylsulfoxide solvate hexahydrate [Cu(Hsalt)(OH2)]2SO4 · 2DMSO · 6H2O (2) (H2salt=Salicylaldehyde thiosemicarbazone) were synthesized and characterized by means of NMR, IR and X-ray techniques. Molecule 1 consists of three units: the sugar, the benzene ring and the thiosemicarbazonic chain. In the reaction of 1 with CuSO4 the helicin thiosemicarbazone was hydrolyzed giving rise to the Salicylaldehyde thiosemicarbazone, so forming complex 2. The molecular structure of 2 consists of centrosymmetric dimeric cations, sulfate anions lying on a crystallographic two-fold axis, DMSO and water solvate molecules. The dimeric cations are due to a long Cu–aromatic ring interaction. Moreover, for both compounds assays of proliferation inhibition and apoptosis tests in vitro on human leukemic cell lines U937 were carried out.

Salwa A Ahmed - One of the best experts on this subject based on the ideXlab platform.

  • synthesis characterization and structure effects on selectivity properties of silica gel covalently bonded diethylenetriamine mono and bis salicyaldehyde and naphthaldehyde schiff s bases towards some heavy metal ions
    Talanta, 2001
    Co-Authors: Ezzat M Soliman, Mohamed E Mahmoud, Salwa A Ahmed
    Abstract:

    Four silica gel-immobilized new metal chelate Schiff(,)s bases were synthesized (I-IV). Silica gel chemically bonded diethylenetriamine mono-naphthaldehyde and mono-salicyaldehyde Schiff's bases (phases I and III) were produced via the interaction of silica gel-modified diethylenetriamine with naphthaldehyde and Salicylaldehyde, respectively. However, phases II and IV arose through the interaction of bis-naphthaldehyde and bis-Salicylaldehyde Schiff(,)s bases of diethylenetriamine with 3-chloropropyltrimethoxysilane modified silica gel. The characterization of such new phases, their capabilities towards selective extraction or separation of Fe(III), Ni(II), Cu(II), Zn(II), Cd(II) and Pb(II) ions were studied and evaluated by both batch and column techniques as a function of pH and time of contact. Phases III and I showed high performance towards Cu(II) extraction, where their Cu(II) sorption determined to be 0.957 and 0.940 mmol g(-1), respectively. However, for phases IV and II, the great affinity was devoted to Fe(III) extraction followed by Cu(II) ions. The reactivity of metal ion sorption was discussed in the light of effects of bulkiness as well as orientation of immobilized chelate on sorbent reactivity. Donor sites of phases III and I (diethylenetriamine and azomethene nitrogens along with phenolic hydroxyl group oxygen) are fully active, whereas phases IV and II are partially active with only participation of oxygen and azomethene nitrogen. The order of increasing thermal stability (IV

Changtong Yang - One of the best experts on this subject based on the ideXlab platform.

  • synthesis characterization and physicochemical properties of copper ii complexes containing Salicylaldehyde semicarbazone
    Polyhedron, 2003
    Co-Authors: Changtong Yang, Jagadese J. Vittal, John D Ranford
    Abstract:

    Abstract Copper(II) complexes containing a series of Salicylaldehyde semicarbazone ligands have been prepared and characterized by a range of physicochemical techniques. The X-ray structure of [Cu(HBnz2)Cl]·H2O (5) (where HBnz2 is Salicylaldehyde-N,N-dibenzyl semicarbazone) shows the complex is monomeric and the copper atom is four coordinated in a distorted square planar geometry. The ligand chelates the copper in a tridentate fashion through the imine N, carbonyl O and phenolato O with the fourth position being occupied by coordinated Cl. The compound [Cu(Ph2)·H2O] (4) (where Ph2 is Salicylaldehyde-N,N-diphenyl semicarbazone) is also formulated as a monomer whereas all other complexes are assumed to have a side-by-side dimeric arrangement of the metal chelating with the phenolate bridging the Cu(II) centres.