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El-Medani SM, Makhlouf AA, Moustafa H, Afifi MA, Haukka M, Ramadan RM. Spectroscopic, crystal structural, theoretical and biological studies of phenylacetohydrazide Schiff base derivatives and their copper complexes. J Mol Struct 2020. [DOI: 10.1016/j.molstruc.2020.127860] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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Ramadan RM, Elantabli FM, El-Medani SM. Conversion of thiol to homodisulfide-Schiff base derivative: Synthesis, molecular structure, crystal structure and DFT studies. J Mol Struct 2019. [DOI: 10.1016/j.molstruc.2019.06.108] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Mohamed RG, Makhlouf AA, Mosad SA, Abdel Aziz AA, El-Medani SM, Ramadan RM. Spectroscopic, DFT, biological, DNA-binding, and antioxidant studies of some metal chelates with a novel thiazole-derived Schiff base. J COORD CHEM 2018. [DOI: 10.1080/00958972.2018.1526375] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Rania G. Mohamed
- Chemistry Department, Faculty of Science, El-Fayoum University, El-Fayoum, Egypt
| | | | - Sherin A. Mosad
- Chemistry Department, Faculty of Science, El-Fayoum University, El-Fayoum, Egypt
| | - Ayman A. Abdel Aziz
- Chemistry Department, Faculty of Science, Ain Shams University, Cairo, Egypt
| | - Samir M. El-Medani
- Chemistry Department, Faculty of Science, El-Fayoum University, El-Fayoum, Egypt
| | - Ramadan M. Ramadan
- Chemistry Department, Faculty of Science, Ain Shams University, Cairo, Egypt
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Copper complexes formed by 3,5-bis(2,2′-bipyridin-4-ylethynyl)benzoic acid and its methyl and ethyl esters as studied by electrospray ionization mass spectrometry. OPEN CHEM 2013. [DOI: 10.2478/s11532-013-0324-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
AbstractElectrospray ionization mass spectrometry was used to study the complexes of ligands containing two bipyridine units, namely 3,5-bis(2,2-bipyridin-4-ylethynyl)benzoic acid (1) and its methyl and ethyl esters (2, 3), with copper cation, with CuCl2 as a source of copper. It was found that the type of complexes formed strongly depends on CuCl2 concentration. At lower CuCl2 concentration, the detected complexes were rather simple and some of them were formed upon electrospray ionization conditions e.g. ions [22+Cu2]2+ and [32+Cu2]2+ (complexes ligand-Cu(I) of stoichiometry 2:2) which are analogical to the well known, for quaterpyridine, helical complexes. At higher CuCl2 concentration, the detected complexes were more complicated, and most of them contained copper cations bridged by chlorides. The largest ions were [L2+Cu4Cl6]2+. The CID MS/MS spectra of these ions allowed determination of their mass spectrometric fragmentation pathways and as a consequence their structure elucidation.
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