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Structures, hydrolysis, stabilities of palladium(II) complexes containing biologically active ligands and species distribution in aqueous solution. J Mol Struct 2019. [DOI: 10.1016/j.molstruc.2019.03.041] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Doucette KA, Hassell KN, Crans DC. Selective speciation improves efficacy and lowers toxicity of platinum anticancer and vanadium antidiabetic drugs. J Inorg Biochem 2016; 165:56-70. [PMID: 27751591 DOI: 10.1016/j.jinorgbio.2016.09.013] [Citation(s) in RCA: 59] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2016] [Revised: 09/22/2016] [Accepted: 09/29/2016] [Indexed: 12/14/2022]
Abstract
Improving efficacy and lowering resistance to metal-based drugs can be addressed by consideration of the coordination complex speciation and key reactions important to vanadium antidiabetic drugs or platinum anticancer drugs under biological conditions. The methods of analyses vary depending on the specific metal ion chemistry. The vanadium compounds interconvert readily, whereas the reactions of the platinum compounds are much slower and thus much easier to study. However, the vanadium species are readily differentiated due to vanadium complexes differing in color. For both vanadium and platinum systems, understanding the processes as the compounds, Lipoplatin and Satraplatin, enter cells is needed to better combat the disease; there are many cellular metabolites, which may affect processing and thus the efficacy of the drugs. Examples of two formulations of platinum compounds illustrate how changing the chemistry of the platinum will result in less toxic and better tolerated drugs. The consequence of the much lower toxicity of the drug, can be readily realized because cisplatin administration requires hospital stay whereas Lipoplatin can be done in an outpatient manner. Similarly, the properties of Satraplatin allow for development of an oral drug. These forms of platinum demonstrate that the direct consequence of more selective speciation is lower side effects and cheaper administration of the anticancer agent. Therefore we urge that as the community goes forward in development of new drugs, control of speciation chemistry will be considered as one of the key strategies in the future development of anticancer drugs.
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Affiliation(s)
- Kaitlin A Doucette
- Cell and Molecular Biology Program, Colorado State University, Fort Collins, CO 80523, USA
| | - Kelly N Hassell
- Cell and Molecular Biology Program, Colorado State University, Fort Collins, CO 80523, USA
| | - Debbie C Crans
- Cell and Molecular Biology Program, Colorado State University, Fort Collins, CO 80523, USA; Dept. Chemistry, Colorado State University, Fort Collins, CO 80523, USA.
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Jastrząb R, Łomozik L, Tylkowski B. Complexes of biogenic amines in their role in living systems. PHYSICAL SCIENCES REVIEWS 2016. [DOI: 10.1515/psr-2016-0003] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Vázquez M, Font-Bardia M, Martínez M. Kinetico-mechanistic studies of substitution reactions on cross-bridged cyclen Co(III) complexes with nucleosides and nucleotides. Dalton Trans 2015; 44:18643-55. [PMID: 26455445 DOI: 10.1039/c5dt01816a] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Kinetico-mechanistic studies on the substitution reactivity of the [Co{(μ-ET)cyclen}(H2O)2](3+) complex cation at pH values within the 6.0-7.0 range with biologically significant ligands have been carried out. The substitution processes have been found to occur exclusively on the mono-hydroxobridged [(Co{(μ-ET)cyclen}(H2O))2(μ-OH)](5+) species formed after equilibration of the cobalt complex in the relevant medium. The studies conducted on the substitution of the aqua/hydroxo ligands of this dinuclear species are indicative of a dominant role of outer-sphere complexation, involving hydrogen-bonding interactions. The values of the outer-sphere complex formation equilibrium constant are in line with the intervention of both the exiting aqua ligands and the NH groups at the encapsulating {(μ-ET)cyclen} ligand. These complexes result in the preferential formation of O- or N-bonded nucleotides depending on the structure of the base moiety of the ligand. Even the entry of the different donor bonded nucleotides is hampered by the hydrogen-bonding interaction with the dangling moiety of an already coordinated ligand. In general the overall substitution processes occur at a faster rate than those published for the fully alkylated encapsulating {(Me)2(μ-ET)cyclen} ligand derivative, as expected for the still available base-catalysing NH groups in the {(μ-ET)cyclen} ligand.
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Affiliation(s)
- Marta Vázquez
- Departament de Química Inorgànica, Universitat de Barcelona, Martí i Franquès 1-11, E-08028 Barcelona, Spain.
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Martínez M, Vázquez M. Kinetico-Mechanistic Studies of Nucleoside and Nucleotide Substitution Reactions of Co(III) Complexes of Fully Alkylated Cyclen. Inorg Chem 2015; 54:4972-80. [PMID: 25943135 DOI: 10.1021/acs.inorgchem.5b00581] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
The solution chemistry of complex [Co{(Me)2(μ-ET)cyclen}(H2O)2](3+) containing a fully substituted tetraammine ligand designed for the avoidance of base-conjugated substitution mechanisms in the 6-8 pH range has been studied. The study should shed some light on the possible involvement of such Co(III) skeleton in inert interactions with biomolecules. The reactivity and speciation of the complex has been found similar to that of the parent cyclen derivative with the presence of mono- and bis-hydroxo-bridged species; at pH < 7.1, all reactivity has been found to be related to the aqua/hydroxo monomeric complexes. Under these pH conditions, the substitution reactions of the aqua/hydroxo ligands by chloride, inorganic phosphate, thymidine, cytidine 5'-monophosphate (5'-CMP), and thymidine-5'-monophosphate (5'-TMP) have been studied at varying conditions; ionic strength has been kept at 1.0 NaClO4 due to the high concentration of 2-(N-morpholino)ethanesulfonic acid (MES) or N-2-hydroxyethylpiperazine-N'-2-ethanesulfonic acid (HEPES) used to ensure buffering. Except for chloride, the process occurs neatly in a one or two step process, showing dissociatively activated substitution mechanisms, having in general large ΔH(⧧), positive ΔS(⧧), and values of ΔV(⧧) close to those corresponding to the liberation of an aqua ligand to the reaction medium. The actuation of noticeable encounter-complex formation equilibrium constants has been found to be the determinant for the reactions with nucleosides and nucleotides, a clear indication of the relevance of hydrogen-bonding interactions in the reactivity of these molecules, even in this highly ionic strength medium. For the substitution of the active aqua/hydroxo ligands with 5'-TMP, the first substitution reaction produces an Nthymine-bound 5'-TMP complex that evolves to a bis-5'-TMP with an Nthymine,Ophosphate-bonding structure. The formation of outer-sphere complexes between the dangling phosphate group of the Nthymine-bound 5'-TMP and the thymine moiety of another entering 5'-TMP has been found to be responsible for this fact, which leaves only the phosphate group for coordination available.
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Affiliation(s)
- Manuel Martínez
- Departament de Química Inorgànica, Universitat de Barcelona, Martí i Franquès 1-11, E-08028 Barcelona, Spain
| | - Marta Vázquez
- Departament de Química Inorgànica, Universitat de Barcelona, Martí i Franquès 1-11, E-08028 Barcelona, Spain
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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] [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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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. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 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] [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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Mohamed MMA, Shoukry MM. Complex Formation Equilibria of Amine-Bridged Dinuclearpalladium(II) Complexes with DNA Constituents. J SOLUTION CHEM 2011. [DOI: 10.1007/s10953-011-9771-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/15/2022]
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Mohamed MM, Shoukry MM. Potentiometric studies of the interaction of amine-bridged dinuclear palladium(II) complex with nitrogen bases. J COORD CHEM 2011. [DOI: 10.1080/00958972.2011.605124] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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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Mixed-Ligand Complexes of 2-(Aminomethyl)benzimidazole Palladium(II) with Various Biologically Relevant Ligands. J SOLUTION CHEM 2006. [DOI: 10.1007/s10953-006-9062-9] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Reactivity of chloro(N-methyliminodiacetato)palladium(II) and chloro(pyridyl-2,6-dicarboxylato)palladium(II) complexes with purine based 5′-nucleotides and glutathione: antitumor activity of platinum(II)-analogs. Inorganica Chim Acta 2005. [DOI: 10.1016/j.ica.2004.09.016] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Lu ZL, Neverov AA, Brown RS. An ortho-palladated dimethylbenzylamine complex as a highly efficient turnover catalyst for the decomposition of PS insecticides. Mechanistic studies of the methanolysis of some PS-containing phosphorothioate triesters. Org Biomol Chem 2005; 3:3379-87. [PMID: 16132100 DOI: 10.1039/b508917d] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An ortho-palladated complex Pd(dmba)(py)(OTf) (9), or Pd(N,N-dimethylbenzylamine)(pyridine)(trifluoromethanesulfonate), was synthesized and its solution properties in methanol studied as a function of pH. In neutral solution the triflate dissociates from the complex to give a dominant form Pd(dmba)(py)(HOCH3), and in acid the pyridine dissociates to give Pyr-H+ and Pd(dmba)(HOCH3)(HOCH3). Under basic conditions, Pd(dmba)(py)(HOCH3) ionizes to give Pd(dmba)(py)(-OCH3) from which the pyridine can dissociate to yield a mixture of a bis-methoxy-bridged dimer (Pd(dmba)(-OCH3))2 (15-dimer), and its monomer Pd(dmba)(HOCH3)(-OCH3). Kinetic studies under buffered conditions reveal that 9 is an effective catalyst for the methanolysis of fenitrothion and other P=S pesticides. The active form of the catalyst is a basic one having one associated methoxide generated with an apparent (s)(s)pK(a) of 10.8. Analysis of the change in the UV/vis spectrum as a function of pH generates a spectrophotometric (s)(s)pK(a) of 10.8 +/- 0.1. This catalytic system is shown to promote the methanolysis of fenitrothion (3), diazinon (4), quinalphos (5), coumaphos (10) and dichlofenthion (11) at 0.05 mol dm(-3) triethyl amine buffer, (s)(s)pH 10.8, 25 degrees C, under turnover conditions where the [phosphorothioate]/[9] ratio is 48.6, 13.4, 13.4, 18.6, and 48.6 respectively. In all cases, the products were derived from displacement of the leaving group by methoxide, the second-order turnover rate constants being 36.9, 0.45, 0.12, >146.7 and 44.3 dm3 mol(-1) s(-1) respectively. An associative mechanism for the catalyzed methanolysis of the P=S pesticides is proposed where a transiently coordinated S=P substrate is intramolecularly attacked by the Pd(II)-coordinated methoxide.
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Affiliation(s)
- Zhong-Lin Lu
- Department of Chemistry, Queen's University, Kingston, Ontario, Canada K7L 3N6
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Complex formation reactions of (N,N′-dimethylethylenediamine) palladium(II) with various biologically relevant ligands. Polyhedron 2001. [DOI: 10.1016/s0277-5387(00)00612-4] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Rau T, Shoukry M, van Eldik R. Complex Formation and Ligand Substitution Reactions of (2-Picolylamine)palladium(II) with Various Biologically Relevant Ligands. Characterization of (2-Picolylamine)(1,1-cyclobutanedicarboxylato)palladium(II). Inorg Chem 1997; 36:1454-1463. [PMID: 11669726 DOI: 10.1021/ic961192v] [Citation(s) in RCA: 55] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The influence of a 2-picolylamine (pic) ligand on the reactivity of Pd(II) complexes was investigated by detailed equilibrium and kinetic studies. Reactions of [Pd(pic)(H(2)O)(2)](2+) with chloride, 1,1-cyclobutanedicarboxylic acid (CBDCAH(2)), inosine (ino), and inosine 5'-monophosphate (5'-IMP) were studied. A significantly higher reactivity for the first reaction step involving the displacement of one coordinated solvent molecule on [Pd(pic)(H(2)O)(2)](2+) was observed for the nucleoside inosine (k(10)( degrees )(C) = 25 400 +/- 200 M(-)(1) s(-)(1)) than for the nucleotide 5'-IMP (k(10)( degrees )(C) = 7100 +/- 300 M(-)(1) s(-)(1)) and for CBDCAH(-) (k(25)( degrees )(C) = 5380 +/- 70 M(-)(1) s(-)(1); DeltaH() = 54 +/- 2 kJ mol(-)(1); DeltaS() = 10 +/- 4 J K(-)(1) mol(-)(1); DeltaV() = -0.2 +/- 0.7 cm(3) mol(-)(1)). The results are compared and discussed in reference to data reported for closely related systems in the literature. The molecular structure of [Pd(pic)(CBDCA)] in solution and in the solid state was resolved. [Pd(pic)(CBDCA)].2H(2)O crystallizes in the space group P2(1)/c (monoclinic, a = 5.659(5) Å, b = 18.320(5) Å, c = 14.027(5) Å, beta = 97.748(5) degrees, V = 1440.94(14) Å(3), Z = 4).
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Affiliation(s)
- Tobias Rau
- Institute for Inorganic Chemistry, University of Erlangen-Nürnberg, Egerlandstrasse 1, 91058 Erlangen, Germany
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Shoukry M, van Eldik R. Correlation between kinetic and thermodynamic complex-formation constants for the interaction of bis(amine)palladium(II) with inosine, inosine 5′-monophosphate and guanosine 5′-monophosphate. ACTA ACUST UNITED AC 1996. [DOI: 10.1039/dt9960002673] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Prinsloo FF, Pienaar JJ, van Eldik R. Complex-formation reactions of dichloro(L-methioninato)-palladium,(II) with inosine and inosine 5′- monophosphate. Labilization induced by the S-donor chelate. ACTA ACUST UNITED AC 1995. [DOI: 10.1039/dt9950003581] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Schmülling M, Ryabov AD, van Eldik R. To what extent can the Pt–C bond of a metallacycle labilize the trans position? A temperature- and pressure-dependent mechanistic study. ACTA ACUST UNITED AC 1994. [DOI: 10.1039/dt9940001257] [Citation(s) in RCA: 45] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Shoukry M, Hohmann H, van Eldik R. Mechanistic information on the reaction of model palladium(II) complexes with purine nucleosides and 5′-nucleotides in reference to the antitumor activity of related platinum complexes. Inorganica Chim Acta 1992. [DOI: 10.1016/s0020-1693(00)92360-0] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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