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Ragheb MA, Soliman MH, Abdelhamid IA, Shoukry MM, Haukka M, Ragab MS. Anticancer behaviour of 2,2'-(pyridin-2-ylmethylene)bis(5,5-dimethylcyclohexane-1,3-dione)-based palladium(II) complex and its DNA, BSA binding propensity and DFT study. J Inorg Biochem 2024; 253:112488. [PMID: 38325158 DOI: 10.1016/j.jinorgbio.2024.112488] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2023] [Revised: 01/06/2024] [Accepted: 01/17/2024] [Indexed: 02/09/2024]
Abstract
Herein, we report the synthesis and biological evaluation of [Pd(L)(OH2)Cl] complex (where L = 2,2'-(pyridin-2-ylmethylene)bis(5,5-dimethylcyclohexane-1,3-dione) as a novel promising anticancer candidate. The complex was characterized by single-crystal X-ray diffraction and other various spectroscopic techniques. Besides, the optimized structure was determined through DFT calculations revealing that the coordination geometry of [Pd(L)(OH2)Cl] complex is square planar. The binding propensity of [Pd(L)(OH2)Cl] complex with DNA and BSA was assessed by the spectrophotometric method. The antimicrobial profile of the ligand and its [Pd(L)(OH2)Cl] complex was screened against clinically important bacterial strains. [Pd(L)(OH2)Cl] complex showed promising activity against these microorganisms. Pd(L)(OH2)Cl] complex exhibited a potent antiproliferative potential compared to its ligand against different human cancer cells (A549, HCT116, MDA-MB-231, and HepG2) with less toxic effect against normal cells (WI-38). Additionally, [Pd(L)(OH2)Cl] complex exerted its anticancer effects against the most responsive cells (HCT116 cells; IC50 = 11 ± 1 μM) through suppressing their colony-forming capabilities and triggering apoptosis and cell cycle arrest at S phase. Quantitative PCR analysis revealed a remarkable upregulation of the mRNA expression level of p53 and caspase-3 by 4.8- and 5.9-fold, respectively, relative to control. Remarkable binding properties and non-covalent interactions between L and its [Pd(L)(OH2)Cl] complex with the binding sites of different receptors including CDK2, MurE ligase, DNA, and BSA were established using molecular docking. Based on our results, [Pd(L)(OH2)Cl] complex is an intriguing candidate for future investigations as a potential anticancer drug for the treatment of colon cancer.
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Affiliation(s)
- Mohamed A Ragheb
- Department of Chemistry (Biochemistry Division), Faculty of Science, Cairo University, Giza, Egypt
| | - Marwa H Soliman
- Department of Chemistry (Biochemistry Division), Faculty of Science, Cairo University, Giza, Egypt
| | | | - Mohamed M Shoukry
- Department of Chemistry, Faculty of Science, Cairo University, Giza, Egypt
| | - Matti Haukka
- Department of Chemistry, University of Jyväskylä, P.O. Box 35, Jyväskylä FI-40014, Finland
| | - Mona S Ragab
- Department of Chemistry, Faculty of Science, Cairo University, Giza, Egypt.
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2
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Ragab MS, Soliman MH, Shehata MR, Shoukry MM, Ragheb MA. Design, synthesis, spectral characterization, photo‐cleavage and
in vitro
evaluation of anticancer activities of new transition metal complexes of piperazine based Schiff base‐oxime ligand. Appl Organomet Chem 2022. [DOI: 10.1002/aoc.6802] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Mona S. Ragab
- Department of Chemistry, Faculty of Science Cairo University Giza Egypt
| | - Marwa H. Soliman
- Department of Chemistry (Biochemistry Division), Faculty of Science Cairo University Giza Egypt
| | | | | | - Mohamed A. Ragheb
- Department of Chemistry (Biochemistry Division), Faculty of Science Cairo University Giza Egypt
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3
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Ragab MS, Shehata MR, Shoukry MM, Haukka M, Ragheb MA. Oxidative DNA cleavage mediated by a new unexpected [Pd(BAPP)][PdCl 4] complex (BAPP = 1,4-bis(3-aminopropyl)piperazine): crystal structure, DNA binding and cytotoxic behavior. RSC Adv 2022; 12:1871-1884. [PMID: 35425175 PMCID: PMC8979008 DOI: 10.1039/d1ra07793g] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2021] [Accepted: 12/17/2021] [Indexed: 12/30/2022] Open
Abstract
A novel Pd(ii) double complex, [Pd(BAPP)][PdCl4], containing the 1,4-bis(3-aminopropyl)piperazine (BAPP) ligand is investigated. X-ray crystallography of a single crystal confirmed the structure of the [Pd(BAPP)][PdCl4] complex. The spectroscopic behavior was also elucidated using elemental analysis, nuclear magnetic resonance and Fourier-transform infrared spectroscopy, and mass spectrometry. The antimicrobial susceptibility of the [Pd(BAPP)][PdCl4] complex against all tested microbial strains was lower than that of the BAPP ligand except for C. albicans. The cytotoxic impacts of the BAPP ligand and its [Pd(BAPP)][PdCl4] complex were evaluated in vitro for HepG2, CaCo-2 and MCF7 cell lines as well as the WI-38 normal cell line. The anticancer activity was markedly improved by the complexation. The [Pd(BAPP)][PdCl4] complex could selectively inhibit the tested cancer cells in a safe way to the non-tumorigenic cell (WI-38). From the DNA binding studies with ultraviolet-visible spectrophotometry, the [Pd(BAPP)][PdCl4] complex interacts more efficiently with the calf thymus DNA than its BAPP ligand through the intercalative binding mode. In the absence of an external reductant, the [Pd(BAPP)][PdCl4] complex cleaved the intact supercoiled pBR322 DNA under physiological conditions in a concentration-dependent manner. Additionally, electrophoretic experiments were performed in the presence of different radical scavengers, namely DMSO, NaN3 and KI, and ruled out the hydrolytic mechanistic pathway of the reaction and suggested that the oxidative mechanism is the preferred one. The results of the binding affinity of the [Pd(BAPP)][PdCl4] complex to human DNA were modeled using a molecular docking study showing that the complex interacts more strongly with human DNA than the ligand. Finally, an in vitro pharmacokinetic study was assessed through in silico ADME predictions.
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Affiliation(s)
- Mona S Ragab
- Department of Chemistry, Faculty of Science, Cairo University Giza 12613 Egypt
| | - Mohamed R Shehata
- Department of Chemistry, Faculty of Science, Cairo University Giza 12613 Egypt
| | - Mohamed M Shoukry
- Department of Chemistry, Faculty of Science, Cairo University Giza 12613 Egypt
| | - Matti Haukka
- Department of Chemistry, University of Jyväskylä P.O. Box 35 FI-40014 Jyväskylä Finland
| | - Mohamed A Ragheb
- Department of Chemistry (Biochemistry Division), Faculty of Science, Cairo University Giza Egypt
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4
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Shoukry MM, Shehata MR, Abdel Wahab AM. Synthesis, characterization, thermal degradation, docking,
DFT
calculation, and biological activity of dimethyltin(
IV
) complex with homopiperazine. J CHIN CHEM SOC-TAIP 2021. [DOI: 10.1002/jccs.202100227] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Mohamed M. Shoukry
- Department of Chemistry, Faculty of Science University of Cairo Giza Egypt
| | - Mohamed R. Shehata
- Department of Chemistry, Faculty of Science University of Cairo Giza Egypt
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5
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Shehata MR, Shoukry MM, Mabrouk MA, Kozakiewicz A, van Eldik R. Studies on Pd(1,4-bis(2-hydroxyethyl)piperazine)-dicarboxylic acid complexes as models for carboplatin with structural features enhancing the interaction with DNA. J COORD CHEM 2019. [DOI: 10.1080/00958972.2019.1632441] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
- Mohamed R. Shehata
- Department of Chemistry, Faculty of Science, University of Cairo, Giza, Egypt
| | - Mohamed M. Shoukry
- Department of Chemistry, Faculty of Science, University of Cairo, Giza, Egypt
- Department of Chemistry, Faculty of Science, Islamic University, Madinah, Saudi Arabia
| | - Mahmoud A. Mabrouk
- Egyptian Academy for Engineering & Advanced Technology (EAE & AT) Affiliated to Ministry of Military Production, Cairo, Egypt
| | - Anna Kozakiewicz
- Faculty of Chemistry, Nicolaus Copernicus University in Toruń, Toruń, Poland
| | - Rudi van Eldik
- Faculty of Chemistry, Nicolaus Copernicus University in Toruń, Toruń, Poland
- Department of Chemistry and Pharmacy, University of Erlangen-Nuremberg, Erlangen, Germany
- Faculty of Chemistry, Jagiellonian University, Krakow, Poland
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6
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Khalf-Alla PA, Hassan SS, Shoukry MM. Complex formation equilibria, DFT, docking, antioxidant and antimicrobial studies of iron(III) complexes involving Schiff bases derived from glucosamine or ethanolamine. Inorganica Chim Acta 2019. [DOI: 10.1016/j.ica.2019.04.035] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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7
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Hassan SS, Shoukry MM, Shallan RN, van Eldik R. Synthesis, characterization, speciation and biological studies on metal chelates of 1-benzoyl(1,2,4-triazol-3-yl)thiourea. J COORD CHEM 2017. [DOI: 10.1080/00958972.2017.1312357] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- Safaa S. Hassan
- Faculty of Science, Department of Chemistry, Cairo University, Giza, Egypt
| | - Mohamed M. Shoukry
- Faculty of Science, Department of Chemistry, Cairo University, Giza, Egypt
- Faculty of Science, Department of Chemistry, Islamic University, Al-Madinah, Saudi Arabia
| | - Rania N. Shallan
- Faculty of Science, Department of Chemistry, Cairo University, Giza, Egypt
| | - Rudi van Eldik
- Department of Chemistry and Pharmacy, University of Erlangen-Nuremberg, Erlangen, Germany
- Faculty of Chemistry, Jagiellonian University, Krakow, Poland
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8
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Shehata MR, Shoukry MM, Ragab MS, van Eldik R. Synthesis, Characterization, Speciation, DNA Cleavage, and Cytotoxic Studies of the Pd[2‐(2‐Aminoethyl)‐1‐methylpyrrolidine]Cl
2
Complex with Reference to Carboplatin. Eur J Inorg Chem 2017. [DOI: 10.1002/ejic.201601524] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
| | - Mohamed M. Shoukry
- Department of Chemistry Faculty of Science Cairo University Giza Egypt
- Department of Chemistry Faculty of Science Islamic University Al‐Madinah Saudi Arabia
| | - Mona S. Ragab
- Department of Chemistry Faculty of Science Cairo University Giza Egypt
| | - Rudi van Eldik
- Department of Chemistry and Pharmacy University of Erlangen‐Nuremberg 91058 Erlangen Germany
- Faculty of Chemistry Jagiellonian University 30‐060 Krakow Poland
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9
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Khalaf-Alla PA, Shoukry MM, Jbarah AA, van Eldik R. Base hydrolysis of α-amino acid esters catalysed by [Pd(N-ethylethylenediamine)(H2O)2]2+. Kinetic study and DFT calculations. Inorganica Chim Acta 2017. [DOI: 10.1016/j.ica.2017.01.006] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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10
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Shehata MR, Shoukry MM, Mabrouk MA, Van Eldik R. Synthesis, X-ray structure, DFT and thermodynamic studies of mono- and binuclear palladium(II) complexes involving 1,4-bis(2-hydroxyethyl)piperazine, bio-relevant ligands and 4,4′-bipiperidine. J COORD CHEM 2016. [DOI: 10.1080/00958972.2015.1132312] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Affiliation(s)
- Mohamed R. Shehata
- Faculty of Science, Department of Chemistry, Cairo University, Giza, Egypt
| | - Mohamed M. Shoukry
- Faculty of Science, Department of Chemistry, Cairo University, Giza, Egypt
| | - Mahmoud A. Mabrouk
- Ministry of Military Production, Science and Technology Center of Excellence (STCE), Cairo, Egypt
| | - Rudi Van Eldik
- Department of Chemistry and Pharmacy, University of Erlangen-Nuremberg, Erlangen, Germany
- Faculty of Chemistry, Jagiellonian University, Krakow, Poland
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11
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Shehata MR, Shoukry MM, Shokry SA, Mabrouk MA. Thermal stability of Pd(1,4-bis(2-hydroxyethyl)piperazine)Cl2 and its role in the catalysis of base hydrolysis of α-amino acid esters. J COORD CHEM 2015. [DOI: 10.1080/00958972.2015.1061659] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- Mohamed R. Shehata
- Faculty of Science, Department of Chemistry, Cairo University, Giza, Egypt
| | - Mohamed M. Shoukry
- Faculty of Science, Department of Chemistry, Cairo University, Giza, Egypt
| | - Shokry A. Shokry
- Science and Technology Center of Excellence (STCE), Ministry of Military Production, Cairo, Egypt
| | - Mahmoud A. Mabrouk
- Science and Technology Center of Excellence (STCE), Ministry of Military Production, Cairo, Egypt
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12
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Shoukry MM, Ezzat SM. Speciation studies of mono- and binuclear Pd(II) complexes involving mixed nitrogen–sulfur donor ligand and 4,4′-bipiperidine as a linker. J COORD CHEM 2015. [DOI: 10.1080/00958972.2015.1043909] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- Mohamed M. Shoukry
- Faculty of Science, Department of Chemistry, University of Cairo, Cairo, Egypt
| | - Sameya M.T. Ezzat
- Faculty of Science, Department of Chemistry, University of Cairo, Cairo, Egypt
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13
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Khalaf Alla PA, Shoukry MM, van Eldik R. Amine-bridged binuclear complexes involving [Pd(ethylenediamine)(H2O)2]2+, 4,4′-bipiperidine and DNA constituents. J COORD CHEM 2015. [DOI: 10.1080/00958972.2015.1035263] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
| | - Mohamed M. Shoukry
- Faculty of Science, Department of Chemistry, University of Cairo, Cairo, Egypt
- Faculty of Science, Department of Chemistry, Islamic University, Madina, Kingdom of Saudi Arabia
| | - Rudi van Eldik
- Department of Chemistry and Pharmacy, University of Erlangen-Nuremberg, Erlangen, Germany
- Faculty of Chemistry, Jagiellonian University, Krakow, Poland
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14
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Shehata MR, Mohamed MM, Shoukry MM, Hussein MA, Hussein FM. Synthesis, characterization, equilibria and biological activity of dimethyltin(IV) complex with 1,4-piperazine. J COORD CHEM 2015. [DOI: 10.1080/00958972.2015.1007962] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Affiliation(s)
- Mohamed R. Shehata
- Faculty of Science, Department of Chemistry, University of Cairo, Cairo, A.R. Egypt
| | - Mahmoud M.A. Mohamed
- Faculty of Science, Department of Chemistry, University of Cairo, Cairo, A.R. Egypt
| | - Mohamed M. Shoukry
- Faculty of Science, Department of Chemistry, University of Cairo, Cairo, A.R. Egypt
- Faculty of Science, Department of Chemistry, Islamic University, Madinah, Kingdom of Saudi Arabia
| | - Mohamed A. Hussein
- Faculty of Pharmacy, Department of Biochemistry, October 6th University, Cairo, A.R. Egypt
| | - Fatma M. Hussein
- Faculty of Science, Department of Chemistry, University of Cairo, Cairo, A.R. Egypt
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15
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Al Alousi AS, Shehata MR, Shoukry MM, Mohamed NM. Interaction of dimethyltin(IV) and trimethyltin(IV) with dehydroacetic acid. Chemical Speciation & Bioavailability 2015. [DOI: 10.3184/095422909x416216] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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16
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Shoukry MM, Hassan SS. Complex formation equilibria of binary and ternary complexes involving 3,3-bis(1-methylimidazol-2yl)propionic acid and bio-relevant ligands as 1-aminocyclopropane carboxylic acid with reference to plant hormone. Spectrochim Acta A Mol Biomol Spectrosc 2014; 118:146-153. [PMID: 24051283 DOI: 10.1016/j.saa.2013.08.070] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/29/2013] [Revised: 08/07/2013] [Accepted: 08/15/2013] [Indexed: 06/02/2023]
Abstract
The formation equilibria for the binary complexes of Cu(II) with 1-aminocyclopropane carboxylic acid (ACC) and 3,3-bis(1-methylimidazol-2-yl)propionic acid (BIMP) were investigated. ACC and BIMP form the complexes 110, 120 and 11-1. The ternary complexes of Cu(II) with BIMP and biorelevant ligands as some selected amino acids, peptides and DNA constituents are formed in a stepwise mechanism. The stability constants of the complexes formed were determined and their distribution diagrams were evaluated. The kinetics of hydrolysis of glycine methyl ester in presence of [Cu(BIMP)](+) was investigated by pH-stat technique and the mechanism was discussed.
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Affiliation(s)
- Mohamed M Shoukry
- Department of Chemistry, Faculty of Science, Islamic University, Madinah, Saudi Arabia; Department of Chemistry, Faculty of Science, University of Cairo, Egypt.
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17
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Mohamed MM, Weber I, Puchta R, Shoukry MM, van Eldik R. Amine-bridged binuclear palladium(II) complexes with inosine. Equilibrium studies and DFT calculations. J COORD CHEM 2013. [DOI: 10.1080/00958972.2013.840367] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
- Mahmoud M.A. Mohamed
- Faculty of Science, Department of Chemistry, Cairo University, Cairo, Egypt
- Faculty of Education, Department of Sciences and Mathematics, Asiut University, Asiut, Egypt
| | - Immo Weber
- Inorganic Chemistry, Department of Chemistry and Pharmacy, University of Erlangen-Nürnberg, Erlangen, Germany
| | - Ralph Puchta
- Inorganic Chemistry, Department of Chemistry and Pharmacy, University of Erlangen-Nürnberg, Erlangen, Germany
- Department of Chemistry and Pharmacy, Computer Chemistry Center, University of Erlangen-Nürnberg, Erlangen, Germany
| | - Mohamed M. Shoukry
- Faculty of Science, Department of Chemistry, Cairo University, Cairo, Egypt
- Faculty of Science, Department of Chemistry, Islamic University, Madinah, Kingdom of Saudi Arabia
| | - Rudi van Eldik
- Inorganic Chemistry, Department of Chemistry and Pharmacy, University of Erlangen-Nürnberg, Erlangen, Germany
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18
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Shoukry MM, Elmoghayar MRH, Ibraim MKA, Elghandour AHH. Transition Metal Complexes of an Antipyrine Derivative. J CHIN CHEM SOC-TAIP 2013. [DOI: 10.1002/jccs.198700003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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19
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El-Sherif AA, Shoukry MM, Abobakr LO. Bivalent transition metal complexes of cetirizine: spectroscopic, equilibrium studies and biological activity. Spectrochim Acta A Mol Biomol Spectrosc 2013; 112:290-300. [PMID: 23685158 DOI: 10.1016/j.saa.2013.04.023] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/06/2012] [Revised: 03/20/2013] [Accepted: 04/02/2013] [Indexed: 06/02/2023]
Abstract
Metal complexes of cetirizine·2HCl (CTZ=2-[2-[4-[(4-chlorophenyl)phenyl methyl]piperazine-1-yl]-ethoxy]acetic acid, dihydrochloride have been prepared and characterized by elemental analyses, IR, solid reflectance, magnetic moment, molar conductance, and UV-Vis spectra. The analytical data of the complexes show the formation of 1:2 [M:L] ratio, where M represents Ni(II), Co(II) and Cu(II) ions, while L represents the deprotonated CTZ ligand. IR spectra show that CTZ is coordinated to the metal ions in a monodentate manner through carboxylate-O atom. Protonation equilibria of CTZ and its metal complexation by some divalent metal ions were determined in aqueous solution at constant ionic strength (0.1 M NaCl) using an automatic potentiometric technique. Thermodynamic parameters for the protonation equilibria of CTZ were calculated and discussed. The stability order of M(II)-CTZ complexes were found to obey Mn(2+)<Co(2+)<Ni(2+)<Cu(2+), in accordance with the Irving-Williams order. The concentration distribution of the complexes in solution is evaluated as a function of pH. The CTZ ligand and its metal complexes were screened for their biological activity against bacterial species (Bacillus subtillis RCMB 010067, Staphylococcus aureus RCMB 010028, Pseudomonas aeuroginosa RCMB 010043, and Escherichia coli RCMB 010052) and fungi as (Aspergillus flavus RCMB 02568, Pencicillium italicum RCMB 03924, Candida albicans RCMB 05031 and Geotricum candidum RCMB 05097). The activity data show that the metal complexes have antibacterial and antifungal activity more than the parent CTZ ligand against one or more bacterial or fungi species. MIC was evaluated for the isolated complexes.
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Affiliation(s)
- Ahmed A El-Sherif
- Department of Chemistry, Faculty of Science, Cairo University, Giza 12613, Egypt.
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20
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El-Sherif AA, Shoukry MM, Abd-Elgawad MMA. Synthesis, characterization, biological activity and equilibrium studies of metal(II) ion complexes with tridentate hydrazone ligand derived from hydralazine. Spectrochim Acta A Mol Biomol Spectrosc 2012; 98:307-321. [PMID: 23021889 DOI: 10.1016/j.saa.2012.08.034] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/18/2012] [Revised: 08/10/2012] [Accepted: 08/14/2012] [Indexed: 06/01/2023]
Abstract
In the present study, a new hydrazone ligand (2-((2-phthalazin-1-yl)hydrazono)methyl)phenol) prepared by condensation of hydralazine (1-Hydralazinophthalazine) with salicylaldehyde (SAH). The synthesized SAH-hydrazone and its metal complexes have been characterized by elemental analyses, IR, (1)H NMR, solid reflectance, magnetic moment, molar conductance, mass spectra, UV-vis and thermal analysis (TGA). The analytical data of the complexes show the formation of 1:1 [M:L] ratio, where M represents Ni(II), Co(II) and Cu(II) ions, while L represents the deprotonated hydrazone ligand. IR spectra show that SAH is coordinated to the metal ions in a tridentate manner through phthalazine-N, azomethine-N and phenolic-oxygen groups. The ligand and their metal chelates have been screened for their antimicrobial activities using the disc diffusion method against the selected bacteria and fungi. Proton-ligand association constants of (SAH) and the stepwise stability constants of its metal complexes are determined potentiometrically in 0.1 M NaNO(3) at different temperatures and the corresponding thermodynamic parameters were derived and discussed. The order of -ΔG° and -ΔH° were found to obey Mn(2+)<Co(2+)<Ni(2+)<Cu(2+), in accordance with the Irving-Williams order. The complexes were stabilized by enthalpy changes and the results suggest that the complexation is an enthalpy-driven process. The concentration distribution diagrams of the complexes are evaluated.
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Affiliation(s)
- Ahmed A El-Sherif
- Department of Chemistry, Faculty of Science, Cairo University, Cairo, Egypt
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21
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Shehata MR, Shoukry MM, Ragab MS. Synthesis and structural characterization of Pd(N,N-dimethylaminopropylamine)Cl2 complex--the interaction with bio-relevant ligands with reference to the effect of cysteine on the deactivation of metal-based drug. Spectrochim Acta A Mol Biomol Spectrosc 2012; 96:809-814. [PMID: 22925907 DOI: 10.1016/j.saa.2012.07.101] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/26/2012] [Revised: 07/19/2012] [Accepted: 07/26/2012] [Indexed: 06/01/2023]
Abstract
The synthesis and X-ray structural characterization of Pd(DMPA)Cl(2) complex, where DMPA=N,N-dimethylaminopropylamine, is reported. The complex crystallizes in the space group P2(1)/c, a=8.8923(4), b=10.9050(5), c=11.5006(7) Å, β=120.00(18)°, V=948.25(8) Å(3), Z=4. The palladium centre has a typical square-planar geometry with a tetrahedral distortion. Stoichiometry and stability constants of the complexes formed between [Pd(DMPA)(H(2)O)(2)](2+) and some selected DNA constituents and cytsteine are investigated at 25 °C and at constant 0.1M ionic strength. The concentration distribution diagrams of the various species formed are evaluated. The equilibrium constants for the displacement of coordinated ligands as inosine by cysteine are calculated. The results are expected to contribute to the chemistry of tumour therapy.
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Affiliation(s)
- Mohamed R Shehata
- Department of Chemistry, Faculty of Science, University of Cairo, Egypt
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El-Sherif AA, Shehata MR, Shoukry MM, Barakat MH. Synthesis, characterization, equilibrium study and biological activity of Cu(II), Ni(II) and Co(II) complexes of polydentate Schiff base ligand. Spectrochim Acta A Mol Biomol Spectrosc 2012; 96:889-897. [PMID: 22935596 DOI: 10.1016/j.saa.2012.07.047] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/26/2012] [Revised: 07/03/2012] [Accepted: 07/11/2012] [Indexed: 06/01/2023]
Abstract
Schiff base ligand, 1,4-bis[(2-hydroxybenzaldehyde)propyl]piperazine (BHPP), and its Cu(II), Ni(II) and Co(II) metal complexes were synthesized and characterized by elemental analysis, magnetic susceptibility, molar conductance and spectral (IR and UV-vis) studies. The ground state of BHPP ligand was investigated using the BUILDER module of MOE. Metal complexes are formed in the 1:1 (M:L) ratio as found from the elemental analysis and found to have the general formula [ML]·nH(2)O, where M=Co(II), Ni(II) and Cu(II), L=BHPP. In all the studied complexes, the (BHPP) ligand behaves as a hexadentate divalent anion with coordination involving the two azomethine nitrogen's, the two nitrogen atoms of piperazine ring and the two deprotonated phenolic OH-groups. The magnetic and spectral data indicates octahedral geometry of metal(II) complexes. The ligand and their metal chelates have been screened for their antimicrobial activities using the disc diffusion method against the selected bacteria and fungi. They were found to be more active against Gram-positive than Gram-negative bacteria. Protonation constants of (BHPP) ligand and stability constants of its Cu(2+), Co(2+) and Ni(2+) complexes were determined by potentiometric titration method in 50% DMSO-water solution at ionic strength of 0.1 M sodium nitrate. It has been observed that the protonated Schiff base ligand (BHPP) have four protonation constants. The divalent metal ions Cu(2+), Ni(2+) and Co(2+) form 1:1 complexes.
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Affiliation(s)
- Ahmed A El-Sherif
- Department of Chemistry, Faculty of Science, Cairo University, Cairo, Egypt.
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Shehata MR, Shoukry MM, Ali S. Thermodynamics of the interaction of Pd(dmen)(H₂O)₂²⁺ with bio-relevant ligands with reference to the deactivation of metal-based drug by thiol ligands. Spectrochim Acta A Mol Biomol Spectrosc 2012; 91:383-388. [PMID: 22387687 DOI: 10.1016/j.saa.2012.01.039] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/28/2011] [Revised: 12/24/2011] [Accepted: 01/16/2012] [Indexed: 05/31/2023]
Abstract
Pd(dmen)Cl(2) complex was synthesized and characterized, where dmen=N,N-dimethylethylenediamine. Stoichiometry and stability constants of the complexes formed between [Pd(dmen)(H(2)O)(2)](2+) and various biologically relevant ligands such as amino acids, peptides and dicarboxylic acids are investigated at 25 °C and at constant 0.1M ionic strength. The concentration distribution diagrams of the various species formed are evaluated. The equilibrium constants for the displacement of coordinated ligands as inosine, glycine or methionine by cysteine are calculated. The results are expected to contribute to the chemistry of tumour therapy.
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Affiliation(s)
- Mohamed R Shehata
- Department of Chemistry, Faculty of Science, Cairo University, Giza, Egypt
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Shoukry MM, Hassouna M, Mahmoud R. Palladium(II) complex taken as a model of an antitumour agent: Synthesis and equilibrium investigation involving biologically relevant ligands. CR CHIM 2012. [DOI: 10.1016/j.crci.2011.12.003] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Shehata MR, Shoukry MM, ali S. Mono- and binuclear complexes involving [Pd(N,N-dimethylethylenediamine)(H2O)2]2+, 4,4′-bipiperidine and DNA constituents. J COORD CHEM 2012. [DOI: 10.1080/00958972.2012.671937] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Affiliation(s)
- Mohamed R. Shehata
- a Department of Chemistry , Faculty of Science, University of Cairo , Cairo , Egypt
| | - Mohamed M. Shoukry
- a Department of Chemistry , Faculty of Science, University of Cairo , Cairo , Egypt
| | - Sara ali
- a Department of Chemistry , Faculty of Science, University of Cairo , Cairo , Egypt
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26
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Hassan SS, Shoukry MM, van Eldik R. Thermodynamics of the interaction of ruthenium(iii) polyaminecarboxylate complexes with bio-relevant ligands. Deactivation of the complexes as NO scavengers by thiol ligands. Dalton Trans 2012; 41:13447-53. [DOI: 10.1039/c2dt31730c] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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27
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Shoukry MM, Al-Najjar AA, Hosny WM, Mahgoub AE, Abdelhadi AK, Khalf-Alaa PA. Thermodynamics of the reactions of [Pd(Et4en)(H2O)2]2+ with ligands of biological significance: deactivation of based-drug by the sulfur-containing biomolecules. J Sulphur Chem 2011. [DOI: 10.1080/17415993.2011.622393] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
Affiliation(s)
- Mohamed M. Shoukry
- a Department of Chemistry, Faculty of Science , University of Cairo , Egypt
| | | | - Wafaa M. Hosny
- a Department of Chemistry, Faculty of Science , University of Cairo , Egypt
| | - Afaf E. Mahgoub
- a Department of Chemistry, Faculty of Science , University of Cairo , Egypt
| | - Afkar K. Abdelhadi
- a Department of Chemistry, Faculty of Science , University of Cairo , Egypt
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29
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Shehata MR, Shoukry MM, Osman AA, AbedelKarim AT. Speciation studies on the complex formation reactions of [Pd(N,N-diethyl-ethylendiamine)(H2O)2]2+ with some bio-relevant ligands and displacement reaction by mercaptoethylamine. Spectrochim Acta A Mol Biomol Spectrosc 2011; 79:1226-1233. [PMID: 21640642 DOI: 10.1016/j.saa.2011.04.047] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/18/2011] [Revised: 03/23/2011] [Accepted: 04/15/2011] [Indexed: 05/30/2023]
Abstract
Pd(deen)Cl2 and Pd(deen)(CBDCA) complexes, where deen=N,N-diethylethylenediamine and CBDCA=1,1-cyclobutanedicarboxylate, were synthesized and characterized by elemental analysis and spectroscopic techniques. The stoichiometry and stability of the complexes formed between various biologically relevant ligands (amino acids, peptides, DNA constituents and dicarboxylic acids) and [Pd(deen)(H2O)2]2+ were investigated at 25 °C and 0.1 M ionic strength. The speciation diagrams of the complexes formed in solutions are evaluated. The mode of coordination of glycylglycine is investigated by spectrophotometric measurements. The equilibrium constants for the displacement of coordinated ligands as inosine, glycine or methionine by mercaptoethylamine are calculated. The results are expected to contribute to the chemistry of antitumour agents.
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Affiliation(s)
- Mohamed R Shehata
- Department of Chemistry, Faculty of Science, University of Cairo, Cairo, Egypt
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30
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Affiliation(s)
- Mahmoud M.A. Mohamed
- a Department of Sciences and Mathematics, Faculty of Education , Assiut University , New-Valley, Egypt
| | - Mohamed M. Shoukry
- b Department of Chemistry, Faculty of Science , Cairo University , Egypt
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Shoukry MM, El-Sherif AA. The Palladium(Ii)-Picolylamine Promoted Hydrolysis of Amino Acid Esters; Kinetic Evidence for Inter- and Intramolecular Mechanisms. Progress in Reaction Kinetics and Mechanism 2011. [DOI: 10.3184/146867811x13095331158775] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The hydrolysis of amino acid esters is catalysed by the palladium(II) complex [Pd(Pic)]2+ (Pic = 2-picolylamine). The reaction has been studied by the pH-stat technique. The overall PdII chelate-promoted hydrolysis of the ethyl esters of glycine and alanine may be accounted by inter-and intramolecular mechanisms depicted in Eqns (1) and (2) respectively. [Formula: see text] (1) [Formula: see text] (2) The kinetic data for histidine and methionine methyl esters are fitted assuming that hydrolysis proceeds solely by the intermolecular mechanism [Eqn (1)]. The rate enhancement compared with the free ester is discussed in terms of the structure of the complex. Activation parameters associated with the hydrolysis have been determined and discussed.
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Affiliation(s)
- Mohamed M. Shoukry
- Department of Chemistry, Faculty of Science, Cairo University, Cairo, Egypt
| | - Ahmed A. El-Sherif
- Department of Chemistry, Faculty of Science, Cairo University, Cairo, Egypt
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Shoukry MM, Al-Najjar AA, Hosny WM, Abdel Hadi AK, Mahgoub AA, Khalf Alla PA. Kinetics of base hydrolysis of α-amino acid esters catalyzed by [Pd(Et 4en)(H 2O) 2] 2+. J COORD CHEM 2010. [DOI: 10.1080/00958972.2010.506611] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- Mohamed M. Shoukry
- a Department of Chemistry, Faculty of Science , Cairo University , 12613 Al Jizah, Egypt
| | - Abdul Aziz Al-Najjar
- a Department of Chemistry, Faculty of Science , Cairo University , 12613 Al Jizah, Egypt
| | - Wafaa M. Hosny
- a Department of Chemistry, Faculty of Science , Cairo University , 12613 Al Jizah, Egypt
| | - Afkar K. Abdel Hadi
- a Department of Chemistry, Faculty of Science , Cairo University , 12613 Al Jizah, Egypt
| | - Afaf A. Mahgoub
- a Department of Chemistry, Faculty of Science , Cairo University , 12613 Al Jizah, Egypt
| | - Perihan A. Khalf Alla
- a Department of Chemistry, Faculty of Science , Cairo University , 12613 Al Jizah, Egypt
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Shoukry MM, Shoukry AA, Khalf Alla PA, Hassan SS. Equilibrium and kinetic investigation of the interaction of model palladium(II) complex with biorelevant ligands. INT J CHEM KINET 2010. [DOI: 10.1002/kin.20511] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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34
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Shehata MR, Shoukry MM, Abdel-Shakour FH, van Eldik R. Equilibrium Studies on Complex-Formation Reactions of Pd[(2-(2-aminoethyl)pyridine)(H2O)2]2+with Ligands of Biological Significance and Displacement Reactions of DNA Constituents. Eur J Inorg Chem 2009. [DOI: 10.1002/ejic.200900352] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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35
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Shoukry AA, Shoukry MM. Coordination properties of hydralazine Schiff base Synthesis and equilibrium studies of some metal ion complexes. Spectrochim Acta A Mol Biomol Spectrosc 2008; 70:686-691. [PMID: 17950027 DOI: 10.1016/j.saa.2007.08.022] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/20/2007] [Revised: 08/24/2007] [Accepted: 08/27/2007] [Indexed: 05/25/2023]
Abstract
In the present study, a new ligand is prepared by condensation of hydralazine (1-Hydralazinophthalazine) with 2-butanon-3-oxime. The acid-base equilibria of the schiff-base and the complex formation equilibria with the metal ions as Cu(II), Ni(II), Co(II), Cd(II), Mn(II) and Zn(II) are investigated potentiometrically. The stability constants of the complexes are determined and the concentration distribution diagrams of the complexes are evaluated. The effect of metal ion properties as atomic number, ionic radius, electronegativity and ionization potential are investigated. The isolated solid complexes are characterized by conventional chemical and physical methods. The potential coordination sites are assigned using the i.r. and (1)H NMR spectra. The structures of the isolated solid complexes are proposed on the basis of the spectral and magnetic studies.
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Affiliation(s)
- Azza A Shoukry
- Department of Chemistry, Faculty of Science, Cairo University, Giza, Egypt
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Shehata MR, Shoukry MM, Nasr FMH, van Eldik R. Complex-formation reactions of dicholoro(S-methyl-l-cysteine)palladium(ii) with bio-relevant ligands. Labilization induced by S-donor chelates. Dalton Trans 2008:779-86. [DOI: 10.1039/b709332b] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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37
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Shoukry AA, Shoukry MM. Potentiometric Studies of Binary and Ternary Complexes Involving Cadmium(II) and Nitrilo-Tris(Methyl Phosphonic Acid) with Amino Acids, peptides and DNA Constituents. ACTA ACUST UNITED AC 2007; 97:733-45. [PMID: 17899886 DOI: 10.1002/adic.200790057] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
The complexing properties of nitrilo-tris(methylphosphonic acid) (NTP) with cadmium(II) were investigated pH-metrically at 25 degrees C and at ionic strength of 0.1 mol dm(-3) (NaNO3). Stoichiometry and stability constants for the complexes formed are reported. Cadmium (II) forms Cd(NTP)(4-) and the corresponding hydroxy complexes. The ternary complexes are formed in a stepwise mechanism whereby NTP binds to cadmium(II), followed by coordination of amino acids, peptides or DNA. The concentration distribution of the various complex species has been evaluated.
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Affiliation(s)
- Azza A Shoukry
- Department of Chemistry, Faculty of Science, Cairo University, Giza, Egypt
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El-Sherif AA, Shoukry MM. Coordination properties of tridentate (N,O,O) heterocyclic alcohol (PDC) with Cu(II). Mixed ligand complex formation reactions of Cu(II) with PDC and some bio-relevant ligands. Spectrochim Acta A Mol Biomol Spectrosc 2007; 66:691-700. [PMID: 16956788 DOI: 10.1016/j.saa.2006.04.013] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/27/2006] [Revised: 04/10/2006] [Accepted: 04/14/2006] [Indexed: 05/11/2023]
Abstract
The formation equilibria of copper(II) complexes and the ternary complexes Cu(PDC)L (PDC=2,6-bis-(hydroxymethyl)-pyridine, HL=amino acid, amides or DNA constituents) have been investigated. Ternary complexes are formed by a simultaneous mechanism. The results showed the formation of Cu(PDC)L, Cu(PDC, H(-1))(L) and Cu(PDC, H(-2))(L) complexes. The concentration distribution of the complexes in solution is evaluated as a function of pH. The effect of dioxane as a solvent on the protonation constant of PDC and the formation constants of Cu(II) complexes are discussed. The thermodynamic parameters DeltaH degrees and DeltaS degrees calculated from the temperature dependence of the equilibrium constants are investigated.
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Affiliation(s)
- Ahmed A El-Sherif
- Department of Chemistry, Faculty of Science, Cairo University, Cairo, Egypt
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39
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El-Sherif AA, Shoukry MM. Equilibrium investigation of complex formation reactions involving copper(II), nitrilo-tris(methyl phosphonic acid) and amino acids, peptides or DNA constitutents. The kinetics, mechanism and correlation of rates with complex stability for metal ion promoted hydrolysis of glycine methyl ester. J COORD CHEM 2007. [DOI: 10.1080/00958970600561399] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Affiliation(s)
- Ahmed A. El-Sherif
- a Department of Chemistry , Faculty of Science, Cairo University , Giza, Egypt
| | - Mohamed M. Shoukry
- a Department of Chemistry , Faculty of Science, Cairo University , Giza, Egypt
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Al-Najjar AA, Mohamed MMA, Shehata MR, Shoukry MM. Tripropyltin(iv) complexes with some selected bioligands in 50% v/v dioxane/water mixture. ACTA ACUST UNITED AC 2006; 96:97-107. [PMID: 16734025 DOI: 10.1002/adic.200690010] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
The interaction of the tri-n-propyltin(IV) (TPT) with some selected bioligands having a variety of model functional groups were investigated using potentiometric technique at 25 degrees C and 0.1 M ionic strength in 50% v/v dioxane/water mixture. TPT is hydrolyzed to give [(C3H7)3SnOH], [(C3H7)3Sn(OH)2]-, and [((C3H7)3Sn)2OH]+. Amino acids and DNA constituents form 1:1 and 1:2 complexes. Peptides form 1:1 complexes and the corresponding deprotonated amide species. The protonated complexes are formed with amino acids, peptides and some DNA constituents. The hydrolysis constants and the stepwise formation constants of the complexes formed in solution were calculated using the nonlinear least-square program MINIQUAD-75. The participation of different ligand functional groups in binding to organotin is discussed. The speciation diagrams of the various complex species were evaluated as a function of pH.
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Affiliation(s)
- Abdul Aziz Al-Najjar
- Department of Applied Sciences, Faculty of Technological Studies, PO Box 42325, 70654 Shuwaikh, Kuwait
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41
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Affiliation(s)
- Mahmoud M. A. Mohamed
- a Department of Sciences and Mathematics, Faculty of Education , Assuit University , New Valley, Egypt
| | - Mohamed R. Shehata
- b Department of Chemistry, Faculty of Science , Cairo University , Giza, Egypt
| | - Mohamed M. Shoukry
- b Department of Chemistry, Faculty of Science , Cairo University , Giza, Egypt
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El-Sherif AA, Shoukry MM. Copper(II) complexes of imino-bis(methyl phosphonic acid) with some bio-relevant ligands. Equilibrium studies and hydrolysis of glycine methyl ester through complex formation. J COORD CHEM 2006. [DOI: 10.1080/00958970500055435] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Affiliation(s)
- Ahmed A. El-Sherif
- a Department of Chemistry , Faculty of Science, Cairo University , Giza, Egypt
| | - Mohamed M. Shoukry
- a Department of Chemistry , Faculty of Science, Cairo University , Giza, Egypt
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Shoukry AA, Mohamed MMA, Shoukry MM. Binary and Ternary Complexes of Copper(II) Involving N,N,N′,N′-Tetramethylethylenediamine (Me4en) and Various Biologically Relevant Ligands. J SOLUTION CHEM 2006. [DOI: 10.1007/s10953-006-9032-2] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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44
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Mohamed MMA, Shoukry AA, Shoukry MM. Kinetics of base hydrolysis of α-amino acid esters catalyzed by the copper(II) complex of N,N,N′,N′-tetramethylethylenediamine (Me4en). INT J CHEM KINET 2006. [DOI: 10.1002/kin.20206] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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45
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Shoukry MM, Shehata MR, Hamza MSA, van Eldik R. Equilibrium, kinetic and solvent effect studies on the reactions of [RuIII(Hedta)(H2O)] with thiols. Dalton Trans 2005:3921-6. [PMID: 16311647 DOI: 10.1039/b510553f] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The interaction of [Ru(III)(edta)(H(2)O)](-) with a series of selected thiols having extra functional groups was investigated potentiometrically and kinetically. The pK(a) values of the uncoordinated carboxylic acid group and coordinated water molecule are 3.12 and 7.41, respectively, in aqueous solution at 25 degrees C and 0.1 M ionic strength. The formation constants of the complexes were determined in the pH range 3-9, and the concentration distribution of the various complex species was evaluated as a function of pH. The effect of dioxane on the pK(a) values of [Ru(III)(Hedta)(H(2)O)] and the formation constants of the corresponding thiol complexes is presented. The study also provides mechanistic information on the reaction of [Ru(III)(edta)(H(2)O)](-) with the thiols. The low values of DeltaH(not equal) and negative values of DeltaS(not equal) and DeltaV(not equal) for the substitution reactions of [Ru(III)(edta)(H(2)O)](-) clearly support the associative character of the substitution process.
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Affiliation(s)
- Mohamed M Shoukry
- Department of Chemistry, Faculty of Science, Cairo University, Giza, Egypt
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Bugarcic ?D, Jancic DM, Shoukry AA, Shoukry MM. Rate and Equilibrium Data for Substitution Reactions of [Pd( dien )Cl] + with L -Cysteine and Glutathione in Aqueous Solution. Monatshefte f�r Chemie / Chemical Monthly 2004. [DOI: 10.1007/s00706-003-0091-4] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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47
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El-Sherif AA, Shoukry MM, van Eldik R. Complex-formation reactions and stability constants for mixed-ligand complexes of diaqua(2-picolylamine)palladium(ii) with some bio-relevant ligands. Dalton Trans 2003. [DOI: 10.1039/b212104b] [Citation(s) in RCA: 60] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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48
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Chatterjee D, Hamza MSA, Shoukry MM, Mitra A, Deshmukh S, van Eldik R. Interaction of [RuIII(edta)(H2O)]– with amino acids in aqueous solution. Equilibrium, kinetic and protease inhibition studiesElectronic supplementary information (ESI) available: kinetic plots and a scheme showing the reaction between [RuIII(edta)(H2O)]– and cysteine. See http://www.rsc.org/suppdata/dt/b2/b208495n/. Dalton Trans 2002. [DOI: 10.1039/b208495n] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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49
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Rabenstein DL, Isab AA, Shoukry MM. Nuclear magnetic resonance studies of the solution chemistry of metal complexes. 18. Complexation of palladium(II) by glycyl-L-histidine and glycyl-L-histidylglycine. Inorg Chem 2002. [DOI: 10.1021/ic00138a061] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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50
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Rabenstein DL, Daignault SA, Isab AA, Arnold AP, Shoukry MM. Nuclear magnetic resonance studies of the solution chemistry of metal complexes. 21. The complexation of zinc by glycylhistidine and alanylhistidine peptides. J Am Chem Soc 2002. [DOI: 10.1021/ja00309a001] [Citation(s) in RCA: 71] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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