13395-16-9Relevant articles and documents
Oxidation of metallic copper with complexones in organic media
Klimov,Davydova,Buzaeva,Dubrovina,Kalyukova
, p. 1657 - 1659 (2010)
Direct oxidation of copper in organic media with complexones (sterically hindered o-quinones; acetylacetone and pyridine as stabilizing ligands) was studied. From the complexes obtained, the initial components can be regenerated.
Synthesis, structure and reactivity of schiff base transition metal mixed ligand complexes derived from isatin and salal
Sridevis,Girija,Satish
, p. 169 - 176 (2021/03/29)
A series of Isatin derivative Schiff base ligands have been prepared by the nucleophilic addition of 5-Bromo isatin with various amine derivatives and characterized by CHNS analysis and spectral data. Similarly, two of salicylaldehyde ligand have been prepared by the nucleophilic addition of Salal with amine derivatives. In order to investigate the coordination behavior of these ligands and their metal complexes of the type M(acac)x, L [M = Cu(II), Ni(II); L = Schiff base ligands; x = 0 or 2] mixed ligand (chelate) have been prepared from the reaction of these ligands with their corresponding metal (Ni, Cu) acetylacetonates. The present paper was an approach to understand the chelating mixed ligand formation in complexes. All the isolated Shiff base ligands and mixed acac metal complexes were characterized by using IR, 1H NMR, UV-Vis, molar conductance and TGA/DTA analysis. The biological activities of all the isolated ligands and their corresponding mixed acac metal complexes have been used to screening against the microorganisms both Gram-positive and Gram-negative bacteria such as E.coli and S.sureus respectively, fungi A. niger and C.albicans and the results have been compared with standard and control. The main idea of these types of biological screening is to understand the role of these isolated compounds in pharmaceutical industries for drug development.
Influence of the counter anion and solvent in the structure of copper derivatives with the 2,3-bis(2-pyridyl)pyrazine ligand
Gutiérrez, Angel,Felisa Perpi?án,Sánchez, Ana E.,Carmen Torralba,Rosario Torres,Pilar Pardo
, p. 2443 - 2451 (2011/02/16)
Several compounds have been isolated from the reaction between different copper bis(acetylacetonato) derivatives and the potentially bridging ligand 2,3-bis(2-pyridyl)pyrazine (bppz). A compound of formula [Cu(tfacac) 2(bppz)] (1) is obtained when the substituted trifluoromethylacetylacetonato is used. The use of different anions and the unsubstituted acetylacetonato give rise to new derivatives of general formula [{Cu(acac))2(μ-bppz)2]X2 (X-- BF4-, 2; PF6-, 3; BPh 4-, 4). In these compounds the bppz ligand is acting as a bridge by chelating one copper atom and bonding monodentate a second copper atom. The presence of anions with different coordination abilities introduces variations in the copper environment and geometry. When the non-coordinating tetraphenylborate is used different compounds depending on the nature of the solvent are obtained. The dimer 4 was isolated from a methanol/chloroform mixture, while in the absence of chloroform the monomeric compound of formula [Cu(acac)(bppz)(ROH)](BPh4)-ROH (ROH=MeOH, 5) was obtained. When ethanol was used instead of methanol the analogous derivative 6 (R=EtOH) was isolated. Both species show a mononuclear structure with the copper atom five-coordinated by the chelating acac and bppz ligands and one hydroxo group occupying the apical position. A similar environment for the copper appears in [Cu(tfacac)(bppz)(MeOH)](BPh4), 7, which shows a dimeric structure through hydrogen bonds interactions. The magnetic susceptibility data of the dimeric compounds show very weak antiferromagnetic interactions between the copper atoms, an expected fact since the bridging bppz ligand is not planar but the monodentate pyridine is more or less perpendicular to the other two aromatic rings, precluding the spin exchange via the it ligand electrons.
