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Pająk M, Fichna J, Woźniczka M. Protonation constants of endo- and exogenous L-amino acids and their derivatives in aqueous and mixed solution: Unraveling molecular secrets. Q Rev Biophys 2024; 57:e10. [PMID: 39422089 DOI: 10.1017/s0033583524000118] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2024]
Abstract
The aim of this review is to summarize the progress made in the determination of the protonation constants of biologically active ligands: endo- and exogenous L-amino acids and their derivatives in aqueous and mixed solutions using different experimental techniques. The knowledge of the protonation constants of the aforementioned ligands is crucial for the determination of the equilibrium constants of complex formation and thus for the understanding of complex biological reactions such as transamination, racemization, and decarboxylation. Thus, the protonation constants of ligands are a measure of their ability to form complexes with metal ions. This knowledge not only helps to understand fundamental biochemical processes, but also has practical applications in areas such as drug design, where ligands are often targeted for therapeutic purposes. The activity of the ligands tends to increase after complexation and their order is consistent with the values of the stepwise dissociation constants of the complexes formed. Understanding the properties of ligands by determining their protonation constants in different environments and their interactions with surrounding molecules is crucial to unraveling the complexity of biological systems.
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Affiliation(s)
- Marek Pająk
- Department of Physical and Biocoordination Chemistry, Medical University of Lodz, Lodz, Poland
| | - Jakub Fichna
- Department of Biochemistry, Medical University of Lodz, Lodz, Poland
| | - Magdalena Woźniczka
- Department of Physical and Biocoordination Chemistry, Medical University of Lodz, Lodz, Poland
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Devi P, Singh K, Dabas P. Synthesis of Co+2, Ni+2, Cu+2, and Zn+2 complexes of Schiff base 5-methyl-3-((3,5-dichlorosalicylidene) amino)-pyrazole, spectral, and biological studies. J COORD CHEM 2022. [DOI: 10.1080/00958972.2022.2035726] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- Priyanka Devi
- Department of Chemistry, Kurukshetra University, Kurukshetra, India
| | - Kiran Singh
- Department of Chemistry, Kurukshetra University, Kurukshetra, India
| | - Pooja Dabas
- Department of Microbiology, Kurukshetra University, Kurukshetra, India
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Güngör Ö, Gürkan P. Potentiometric and antimicrobial studies on the asymmetric Schiff bases and their binuclear Ni(II) and Fe(III) complexes; synthesis and characterization of the complexes. ARAB J CHEM 2019. [DOI: 10.1016/j.arabjc.2015.02.009] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022] Open
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Xiao Y, Cao C. Influence of substituent effects on the coordination ability of salicylaldehyde Schiff bases. J COORD CHEM 2019. [DOI: 10.1080/00958972.2018.1540780] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Affiliation(s)
- Yan Xiao
- School of Resource Environment and Safety Engineering, School of Chemistry and Chemical Engineering, Key Laboratory of Theoretical Organic Chemistry and Function Molecule, Ministry of Education, Hunan University of Science and Technology, Xiangtan, China
| | - Chenzhong Cao
- School of Resource Environment and Safety Engineering, School of Chemistry and Chemical Engineering, Key Laboratory of Theoretical Organic Chemistry and Function Molecule, Ministry of Education, Hunan University of Science and Technology, Xiangtan, China
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Torabi V, Kargar H, Akbari A, Behjatmanesh-Ardakani R, Amiri Rudbari H, Nawaz Tahir M. Nickel(II) complex with an asymmetric tetradentate Schiff base ligand: synthesis, characterization, crystal structure, and DFT studies. J COORD CHEM 2018. [DOI: 10.1080/00958972.2018.1521967] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Affiliation(s)
- Vajiheh Torabi
- Department of Chemistry, Payame Noor University, Tehran, Islamic Republic of Iran
| | - Hadi Kargar
- Department of Chemistry, Payame Noor University, Tehran, Islamic Republic of Iran
| | - Alireza Akbari
- Department of Chemistry, Payame Noor University, Tehran, Islamic Republic of Iran
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Mixed-ligand complex formation of tenoxicam drug with some transition metal ions in presence of valine: Synthesis, characterization, molecular docking, potentiometric and evaluation of the humeral immune response of calves. J Mol Liq 2016. [DOI: 10.1016/j.molliq.2016.09.065] [Citation(s) in RCA: 64] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Protonation equilibria of biologically active ligands in mixed aqueous organic solvents. Bioinorg Chem Appl 2014; 2014:626719. [PMID: 25197267 PMCID: PMC4150405 DOI: 10.1155/2014/626719] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2014] [Accepted: 07/16/2014] [Indexed: 11/29/2022] Open
Abstract
The review is mainly concerned with the protonation equilibria of biologically active ligands like amino acids, peptides, DNA constituents, and amino acid esters in nonaqueous media. Equilibrium concentrations of proton-ligand formation as a function of pH were investigated. Also, thermodynamics associated with protonation equilibria were also discussed.
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Erden PE, Aslan N, Doğan A, Canel E, Kiliç E. Effect of Solvent Composition on Protonation Constants of Some Glycine Dipeptides. J SOLUTION CHEM 2014. [DOI: 10.1007/s10953-014-0191-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Aljahdali MS, Abedelkarim AT, El-Sherif AA, Ahmed MM. Synthesis, characterization, equilibrium studies, and biological activity of complexes involving copper(II), 2-aminomethylthiophenyl-4-bromosalicylaldehyde Schiff base, and selected amino acids. J COORD CHEM 2014. [DOI: 10.1080/00958972.2014.900549] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Affiliation(s)
- Mutlaq S. Aljahdali
- Faculty of Science, Department of Chemistry, King Abdulaziz University, Jeddah, Kingdom of Saudi Arabia
| | | | - Ahmed A. El-Sherif
- Faculty of Science, Department of Chemistry, Cairo University, Cairo, Egypt
- Faculty of Arts and Science, Department of Chemistry, Northern Border University, Rafha, Kingdom of Saudi Arabia
| | - Mahmoud M. Ahmed
- New-Valley Faculty of Education, Department of Sciences and Mathematics, Assiut University, Assiut, Egypt
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Aljahdali MS, El-Sherif AA, Hilal RH, Abdel-Karim AT. Mixed bivalent transition metal complexes of 1,10-phenanthroline and 2-aminomethylthiophenyl-4-bromosalicylaldehyde Schiff base: Spectroscopic, molecular modeling and biological activities. ACTA ACUST UNITED AC 2013. [DOI: 10.5155/eurjchem.4.4.370-378.803] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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El-Sherif AA, Aljahdali MS. Review: protonation, complex-formation equilibria, and metal–ligand interaction of salicylaldehyde Schiff bases. J COORD CHEM 2013. [DOI: 10.1080/00958972.2013.839027] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
- Ahmed A. El-Sherif
- Faculty of Science, Department of Chemistry, Cairo University, Cairo, Egypt
- Faculty of Arts and Science, Department of Chemistry, Northern Border University, Rafha, Saudi Arabia
| | - Mutlaq S. Aljahdali
- Faculty of Science, Department of Chemistry, King Abd Al-Aziz University, Jeddah, Saudi Arabia
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Tong WL, Yiu SM, Chan MCW. Crowded Bis-(M-salphen) [M = Pt(II), Zn(II)] Coordination Architectures: Luminescent Properties and Ion-Selective Responses. Inorg Chem 2013; 52:7114-24. [DOI: 10.1021/ic400692x] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Wah-Leung Tong
- Department of Biology and Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong
Kong, China
| | - Shek-Man Yiu
- Department of Biology and Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong
Kong, China
| | - Michael C. W. Chan
- Department of Biology and Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong
Kong, China
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Protonation Equilibria of Some Selected α-Amino Acids in DMSO–Water Mixture and Their Cu(II)-Complexes. J SOLUTION CHEM 2013. [DOI: 10.1007/s10953-013-9966-0] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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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. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 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] [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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El-Sherif AA, Eldebss TMA. Synthesis, spectral characterization, solution equilibria, in vitro antibacterial and cytotoxic activities of Cu(II), Ni(II), Mn(II), Co(II) and Zn(II) complexes with Schiff base derived from 5-bromosalicylaldehyde and 2-aminomethylthiophene. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2011; 79:1803-1814. [PMID: 21705267 DOI: 10.1016/j.saa.2011.05.062] [Citation(s) in RCA: 97] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/25/2010] [Revised: 05/18/2011] [Accepted: 05/24/2011] [Indexed: 05/31/2023]
Abstract
Schiff base namely 2-aminomethylthiophenyl-4-bromosalicylaldehyde (ATS)(4-bromo-2-(thiophen-2-yl-imino)methylphenol) and its metal complexes have been synthesized and characterized by elemental analyses, IR, 1H NMR, solid reflectance, magnetic moment, molar conductance, mass spectra, ESR and thermal analysis (TGA). The analytical data of the complexes show the formation of 1:2 [M:L] ratio of the formula [ML2], where M represents Ni(II), Zn(II) and Cu(II) ions, while L represents the deprotonated Schiff base. IR spectra show that ATS is coordinated to the metal ions in a bidentate manner through 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. A cytotoxicity of the compounds against colon (HCT116) and larynx (HEP2) cancer cells have been studied. Protonation constants of (ATS) ligand and stability constants of its Cu2+, Co2+, Mn2+, Zn2+ and Ni2+ complexes were determined by potentiometric titration method in 50% (v/v) DMSO-water solution at ionic strength of 0.1 M NaNO3.
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Affiliation(s)
- Ahmed A El-Sherif
- Faculty of Science, Chemistry Department, Cairo University, Giza, Egypt.
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Wang H. {2,2′-[4-Chloro-5-methyl-o-phenylenebis(nitrilomethylidyne)]diphenolato}nickel(II). Acta Crystallogr Sect E Struct Rep Online 2010; 66:m1571. [PMID: 21589258 PMCID: PMC3011529 DOI: 10.1107/s1600536810046088] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2010] [Accepted: 11/09/2010] [Indexed: 11/10/2022]
Abstract
In the title complex, [Ni(C21H15ClN2O2)], the NiII ion is coordinated by two N and two O atoms from the tetradentate Schiff base ligand in a distorted square geometry. The crystal packing exhibits short intermolecular Ni⋯Ni distances of 3.273 (3) Å.
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Ray A, Banerjee S, Rosair GM, Gramlich V, Mitra S. Variation in coordinative property of two different N2O2 donor Schiff base ligands with nickel(II) and cobalt(III) ions: characterisation and single crystal structure elucidation. Struct Chem 2008. [DOI: 10.1007/s11224-008-9304-0] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Belaid S, Djebbar S, Benali-Baitich O, Khan M, Bouet G. Complex formation between manganese(II), cobalt(II), nickel(II), copper(II) and a series of new ligands derived from N,N′-O-phenylenebis(salicylideneimine). CR CHIM 2007. [DOI: 10.1016/j.crci.2006.09.012] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Excited state intramolecular proton transfer (ESIPT) in a dioxotetraamine derived schiff base and its complexation with Fe(III) and Cr(III). J Photochem Photobiol A Chem 2007. [DOI: 10.1016/j.jphotochem.2006.12.027] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Golcu A, Tumer M, Demirelli H, Wheatley RA. Cd(II) and Cu(II) complexes of polydentate Schiff base ligands: synthesis, characterization, properties and biological activity. Inorganica Chim Acta 2005. [DOI: 10.1016/j.ica.2004.11.026] [Citation(s) in RCA: 263] [Impact Index Per Article: 13.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Mederos A, Domı́nguez S, Hernández-Molina R, Sanchiz J, Brito F. Coordinating ability of ligands derived from phenylenediamines. Coord Chem Rev 1999. [DOI: 10.1016/s0010-8545(99)00050-8] [Citation(s) in RCA: 44] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Hernández-Molina R, Mederos A, Gili P, Domínguez S, Núñez P. Complexation equilibria of N,N′-o-phenylenebis(salicylideneimine). Polyhedron 1997. [DOI: 10.1016/s0277-5387(97)00267-2] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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