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Thermodynamic stability and structure in aqueous solution of the [Cu(PTA) 4] + complex (PTA = aminophosphine‑1,3,5‑triaza‑7‑phosphaadamantane). J Inorg Biochem 2018; 188:50-61. [PMID: 30121398 DOI: 10.1016/j.jinorgbio.2018.08.008] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2018] [Revised: 06/25/2018] [Accepted: 08/08/2018] [Indexed: 01/05/2023]
Abstract
The chemistry of copper(I) with water-soluble phosphines is an emergent area of study which has the objective of finding ligands that stabilize copper in its lower oxidation state. Cu(I) has been found relevant in the mechanism of copper transports into cells, and the accessibility of this oxidation state has implications in oxidative stress processes. For these reasons the possibility to deal with stable, water soluble copper(I) is an attractive approach for devising new biologically relevant metal-based drugs and chelating agents. Here we present the X-ray absorption spectroscopy (XAS) and UV-visible spectrophotometric study of the [Cu(PTA)4]BF4 complex (PTA = aminophosphine‑1,3,5‑triaza‑7‑phosphaadamantane). In particular, we have studied the stability of the [Cu(PTA)n]+ species (n = 2-4) in aqueous medium, and their speciation as a function of the total [Cu(PTA)4]BF4 concentration by means of competitive UV-visible spectrophotometric titrations using metallochromic indicators. Also, the structure in solution of the Cu(I)/PTA species and the nature of the first coordination sphere of the metal were studied by transformed XAS. Both techniques allowed to study samples with total [Cu(PTA)4]BF4 concentration down to 68-74 μM, possibly relevant for biological applications. Overall, our data suggest that the [Cu(PTA)n]+ species are stable in solution, among which [Cu(PTA)2]+ has a remarkable thermodynamic stability. The tendency of this last complex to form adducts with N-donor ligands is demonstrated by the spectrophotometric data. The biological relevance of PTA towards Cu(I), especially in terms of chemotreatments and chelation therapy, is discussed on the basis of the speciation model the Cu(I)/PTA system.
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2
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Singh M, Malik P, Bhushan R. Resolution of Enantiomers of (RS)-Baclofen by Ligand-Exchange Thin-Layer Chromatography. J Chromatogr Sci 2016; 54:842-6. [PMID: 26896346 DOI: 10.1093/chromsci/bmw014] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2015] [Indexed: 11/14/2022]
Abstract
A new chromatographic method has been developed for direct enantioresolution of (RS)-baclofen by ligand-exchange thin-layer chromatography (TLC) adopting two different approaches; (A) TLC plates were prepared by mixing the ligand exchange reagents (LER) with silica gel slurry and the chromatograms were developed with different achiral solvents or solvents having no chiral additive, and (B) the LER consisting of Cu(II)-L-amino acid complex was used as chiral mobile phase additive and the plain plates of silica gel having no chiral selector were used. Cu(II) acetate and four L-amino acids (namely, L-tryptophan, L-histidine, L-proline and L-phenylalanine) were used for the preparation of LERs. Spots were located by the use of iodine vapor. Effect of temperature and the mole ratio of Cu(II)-to-amino acid on enantioresolution were also studied. The results for the two methods have been compared, and the issue of involvement of the Cu(II) cation for the best performance of the two methods has been discussed with respect to the same mobile phase. L-Trp proved to be a good ligand using a common mobile phase in each case.
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Affiliation(s)
- Manisha Singh
- Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee 247667, India
| | - Poonam Malik
- Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee 247667, India
| | - Ravi Bhushan
- Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee 247667, India
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3
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Marchiò L, Marchetti N, Atzeri C, Borghesani V, Remelli M, Tegoni M. The peculiar behavior of Picha in the formation of metallacrown complexes with Cu(ii), Ni(ii) and Zn(ii) in aqueous solution. Dalton Trans 2015; 44:3237-50. [DOI: 10.1039/c4dt03264k] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The thermodynamic stability of copper, nickel and zinc metallacrown complexes with picolinehydroxamic acid in aqueous solution has been rationalized.
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Affiliation(s)
| | - Nicola Marchetti
- Department of Chemical and Pharmaceutical Sciences
- University of Ferrara
- 44121 Ferrara
- Italy
| | - Corrado Atzeri
- Department of Chemistry
- University of Parma
- 43124 Parma
- Italy
| | | | - Maurizio Remelli
- Department of Chemical and Pharmaceutical Sciences
- University of Ferrara
- 44121 Ferrara
- Italy
| | - Matteo Tegoni
- Department of Chemistry
- University of Parma
- 43124 Parma
- Italy
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4
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Batra S, Singh M, Bhushan R. l-Amino acids as chiral selectors for the enantioseparation of (±)-bupropion by ligand exchange thin-layer chromatography using Cu(II) complexviafour different approaches. JPC-J PLANAR CHROMAT 2014. [DOI: 10.1556/jpc.27.2014.5.7] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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5
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Alizadeh T. Enantioseparation of atenolol using chiral ligand-exchange chromatography on C8 column. Sep Purif Technol 2013. [DOI: 10.1016/j.seppur.2013.08.032] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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6
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Gecse Z, Ilisz I, Nonn M, Grecsó N, Fülöp F, Agneeswari R, Hyun MH, Péter A. High-performance liquid chromatographic enantioseparation of isoxazoline-fused 2-aminocyclopentanecarboxylic acids on a chiral ligand-exchange stationary phase. J Sep Sci 2013; 36:1335-42. [DOI: 10.1002/jssc.201201061] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2012] [Revised: 01/16/2013] [Accepted: 01/17/2013] [Indexed: 12/25/2022]
Affiliation(s)
- Zsanett Gecse
- Department of Inorganic and Analytical Chemistry; University of Szeged; Szeged Hungary
- Institute of Pharmaceutical Chemistry; University of Szeged; Szeged Hungary
| | - István Ilisz
- Department of Inorganic and Analytical Chemistry; University of Szeged; Szeged Hungary
| | - Melinda Nonn
- Institute of Pharmaceutical Chemistry; University of Szeged; Szeged Hungary
- Research Group of Stereochemistry of the Hungarian Academy of Science; University of Szeged; Szeged Hungary
| | - Nóra Grecsó
- Department of Inorganic and Analytical Chemistry; University of Szeged; Szeged Hungary
| | - Ferenc Fülöp
- Institute of Pharmaceutical Chemistry; University of Szeged; Szeged Hungary
- Research Group of Stereochemistry of the Hungarian Academy of Science; University of Szeged; Szeged Hungary
| | - Rajalingam Agneeswari
- Department of Chemistry and Chemistry Institute for Functional Materials; Pusan National University; Busan South Korea
| | - Myung Ho Hyun
- Department of Chemistry and Chemistry Institute for Functional Materials; Pusan National University; Busan South Korea
| | - Antal Péter
- Department of Inorganic and Analytical Chemistry; University of Szeged; Szeged Hungary
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7
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Remelli M, Bacco D, Dallavalle F, Lazzari E, Marchetti N, Tegoni M. Stoichiometric diversity of Ni(ii) metallacrowns with β-alaninehydroxamic acid in aqueous solution. Dalton Trans 2013; 42:8018-25. [DOI: 10.1039/c3dt50370d] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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8
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Bacco D, Bertolasi V, Dallavalle F, Galliera L, Marchetti N, Marchiò L, Remelli M, Tegoni M. Metallacrowns of Ni(ii) with α-aminohydroxamic acids in aqueous solution: beyond a 12-MC-4, an unexpected (vacant?) 15-MC-5. Dalton Trans 2011; 40:2491-501. [DOI: 10.1039/c0dt00832j] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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9
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Aquilanti G, Giorgetti M, Minicucci M, Papini G, Pellei M, Tegoni M, Trasatti A, Santini C. A study on the coordinative versatility of new N,S-donor macrocyclic ligands: XAFS, and Cu2+ complexation thermodynamics in solution. Dalton Trans 2011; 40:2764-77. [DOI: 10.1039/c0dt01401j] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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10
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Natalini B, Giacchè N, Sardella R, Ianni F, Macchiarulo A, Pellicciari R. Computational studies for the elucidation of the enantiomer elution order of amino acids in chiral ligand-exchange chromatography. J Chromatogr A 2010; 1217:7523-7. [DOI: 10.1016/j.chroma.2010.10.001] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2010] [Revised: 09/29/2010] [Accepted: 10/01/2010] [Indexed: 11/15/2022]
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11
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Tegoni M, Furlotti M, Tropiano M, Lim CS, Pecoraro VL. Thermodynamics of core metal replacement and self-assembly of Ca(2+) 15-metallacrown-5. Inorg Chem 2010; 49:5190-201. [PMID: 20429607 DOI: 10.1021/ic100315u] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The equilibria for core Ca(2+) replacement by Ln(3+) in copper(II) 15-MC-5 complexes have been investigated using a series of visible spectrophotometric titrations of calcium(II) metallacrowns ({Ca(II)[15-MC(Cu(II)(N)(L))-5]}(2+)) with Ln(3+) ions (H(2)L = pheha, (S)-alpha-phenylalaninehydroxamic acid, or trpha, (S)-alpha-tryptophanhydroxamic acid). These studies allowed the determination of the equilibrium constants for the reaction {Ca(II)[15-MC(Cu(II)(N)(L))-5]}(2+) + Ln(3+) --> {Ln(III)[15-MC(Cu(II)(N)(L))-5]}(3+) + Ca(2+) in methanol/water 9:1 (Ln(3+) = La(3+), Gd(3+), Dy(3+), Er(3+)) or 99:1 (Ln(3+) = La(3+), Nd(3+), Gd(3+), Dy(3+), Er(3+), Yb(3+)), respectively. The log K for these reactions decreases with increasing atomic number of the lanthanide(III), ranging from 6.1 to 3.91 in methanol/water 9:1. The same behavior is observed in methanol/water 99:1, although the constants are uniformly lower (log K = 4.09-2.52). A significant thermodynamic selectivity was observed for the later lanthanides (Gd(3+)-Yb(3+)) while a smaller selectivity is present throughout the beginning of the series (La(3+)-Gd(3+)). This observation has been interpreted on the basis of the size correspondence between the metal ions and the metallacrown cavity. The overall stability of the {Ca(II)[15-MC(Cu(II)(N)(L))-5]}(2+) in methanol/water 9:1 has been determined by pH-spectrophotometric titrations with HCl. The resulting log K values are 63.46(12) and 65.05(13) for pheha and trpha, respectively (Ca(2+) + 5Cu(2+) + 5HL(-) = {Ca(II)[15-MC(Cu(II)(N)(L))-5]}(2+) +5H(+)). The stability of both the La(3+) and Ca(2+) 15-metallacrown-5 complexes in the presence of high Na(+) concentrations has also been demonstrated by spectophotometric studies. Based upon these observations, the preference of the 15-MC-5 for Ca(2+) complexation compared to crown ethers has been quantitatively demonstrated for the first time.
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Affiliation(s)
- Matteo Tegoni
- Department of General and Inorganic, Analytical and Physical Chemistry, University of Parma, Parma, 43100, Italy.
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12
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Dallavalle F, Remelli M, Sansone F, Bacco D, Tegoni M. Thermodynamics of Self-Assembly of Copper(II) 15-Metallacrown-5 of Eu(III) or Gd(III) with (S)-α-Alaninehydroxamic Acid in Aqueous Solution. Inorg Chem 2010; 49:1761-72. [DOI: 10.1021/ic902146d] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Francesco Dallavalle
- Dipartimento di Chimica Generale ed Inorganica, Chimica Analitica, Chimica Fisica, Università di Parma, 43100 Parma, Italy
| | - Maurizio Remelli
- Dipartimento di Chimica, Università di Ferrara, 44121 Ferrara, Italy
| | - Francesco Sansone
- Dipartimento di Chimica Organica ed Industriale, Università di Parma, 43100 Parma, Italy
| | - Dimitri Bacco
- Dipartimento di Chimica, Università di Ferrara, 44121 Ferrara, Italy
| | - Matteo Tegoni
- Dipartimento di Chimica Generale ed Inorganica, Chimica Analitica, Chimica Fisica, Università di Parma, 43100 Parma, Italy
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Aït Adoubel A, Morin CJ, Mofaddel N, Dupas G, Desbène PL. Enantioseparation of underivatised amino acids by ligand exchange capillary electrophoresis in a counter-electroosmotic mode. Anal Bioanal Chem 2009; 394:597-608. [DOI: 10.1007/s00216-009-2694-z] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2008] [Revised: 02/04/2009] [Accepted: 02/09/2009] [Indexed: 10/21/2022]
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14
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Delferro M, Cauzzi D, Pattacini R, Tegoni M, Graiff C, Tiripicchio A. A Study on the Coordinative Versatility of the Zwitterionic S,N,S Ligand EtNHC(S)Ph2P=NPPh2C(S)NEt in Its Anionic, Neutral and Cationic Forms – Determination of Absolute pKa Values in CH2Cl2 of RhI Complexes. Eur J Inorg Chem 2008. [DOI: 10.1002/ejic.200800075] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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15
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Natalini B, Sardella R, Macchiarulo A, Pellicciari R. S-Trityl-(R)-cysteine, a powerful chiral selector for the analytical and preparative ligand-exchange chromatography of amino acids. J Sep Sci 2008; 31:696-704. [DOI: 10.1002/jssc.200700511] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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16
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Tegoni M, Remelli M, Bacco D, Marchiò L, Dallavalle F. Copper(ii) 12-metallacrown-4 complexes of α-, β- and γ-aminohydroxamic acids: a comparative thermodynamic study in aqueous solution. Dalton Trans 2008:2693-701. [DOI: 10.1039/b718765c] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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17
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Tardito S, Bussolati O, Maffini M, Tegoni M, Giannetto M, Dall'asta V, Franchi-Gazzola R, Lanfranchi M, Pellinghelli MA, Mucchino C, Mori G, Marchio L. Thioamido Coordination in a Thioxo-1,2,4-triazole Copper(II) Complex Enhances Nonapoptotic Programmed Cell Death Associated with Copper Accumulation and Oxidative Stress in Human Cancer Cells. J Med Chem 2007; 50:1916-24. [PMID: 17373781 DOI: 10.1021/jm061174f] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The thioamido function of [CuCl2(1H)]Cl (2) (1=4-amino-1,4-dihydro-3-(2-pyridyl)-5-thioxo-1,2,4-triazole), a cytotoxic copper complex, was converted into thioether moieties, leading to the synthesis of [CuCl2(3)]2 (4) and [CuCl2(5)] (6) (3=6-methyl-3-pyridin-2-yl-7H-[1,2,4]triazolo[3,4-b][1,3,4]thiadiazine; 5=4-amino-5-ethylthio-3-(2-pyridyl)-1,2,4-triazole). These complexes were structurally characterized, and their stability constants, along with their biological activity, were determined. 4 and 6 were slightly less stable and significantly less active than 2. However, as 2, both complexes induced nonapoptotic vacuolar cell death. Copper uptake, investigated in both 2-sensitive and -insensitive cell types, was markedly higher in sensitive cells where it was associated with an increase in oxidized glutathione. These data suggest that the thioamido function enhances the cytotoxicity of copper complexes in cancer cells promoting the accumulation of the metal and its interaction with cell thiols.
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Affiliation(s)
- Saverio Tardito
- Dipartimento di Chimica Generale ed Inorganica, Chimica Analitica, Chimica Fisica, Università degli Studi di Parma, Viale G.P. Usberti 17/A, 43100 Parma, Italy
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18
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Tegoni M, Ferretti L, Sansone F, Remelli M, Bertolasi V, Dallavalle F. Synthesis, Solution Thermodynamics, and X-ray Study of CuII [12]Metallacrown-4 with GABA Hydroxamic Acid: An Unprecedented Crystal Structure of a [12]MC-4 with a γ-Aminohydroxamate. Chemistry 2007; 13:1300-8. [PMID: 17072932 DOI: 10.1002/chem.200601035] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
The solution equilibria of gamma-aminobutanehydroxamic acid (GABAha) with H+ and Cu2+ were investigated by potentiometry, titration calorimetry, spectrophotometry, NMR spectroscopy, and ESI-MS. The thermodynamic parameters of the CuII [12]metallacrown-4 obtained for GABAha were compared with those of the corresponding complexes of (S)-alpha-Alaha and beta-Alaha. The stability (-DeltaG0) sequence was beta-Alaha>>alpha-Alaha>GABAha, whereas the order of formation enthalpies (-DeltaH0) was beta-Alaha>>GABAha>alpha-Alaha. These data were interpreted on the basis of the dimensions of the chelate rings and the planarity of the metallamacrocycles. The CuII [12]metallacrown-4 ([12]MC-4) complex of GABAha was isolated and its crystal structure, which is the first reported for a [12]MC-4 of a gamma-aminohydroxamic acid, fully supports the structural features interpreted from the thermodynamic data.
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Affiliation(s)
- Matteo Tegoni
- Dipartimento di Chimica Generale ed Inorganica, Chimica Analitica, Chimica Fisica, Università degli Studi di Parma, Viale G.P. Usberti 17A, 43100 Parma, Italy
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Natalini B, Sardella R, Macchiarulo A, Natalini S, Pellicciari R. (S)-(–)-α,α-Di(2-naphthyl)-2-pyrrolidinemethanol, a useful tool to study the recognition mechanism in chiral ligand-exchange chromatography. J Sep Sci 2007; 30:21-7. [PMID: 17313137 DOI: 10.1002/jssc.200600242] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
A dynamic coating of the RP-18 carbon chain layers with the new chiral selector (S)-(-)-alpha,alpha-di(2-naphthyl)-2-pyrrolidinemethanol allowed the formation of a mixed chiral stationary phase that has been used in the separation of a selected set of amino acid racemates. Both a representative model and classification structure-property relationship studies have been performed in order to study the contribution of hydrophobic, bulky and electron-donating groups in the side chain of the chiral selector to the mechanism of chiral recognition.
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Affiliation(s)
- Benedetto Natalini
- Dipartimento di Chimica e Tecnologia del Farmaco, Università degli Studi di Perugia, Perugia, Italy.
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Dallavalle F, Folesani G, Pelosi G, Ferrari MB, Galaverna G, Corradini R, Marchelli R. Copper(II) Complexes with Chiral Diaminodiamido Ligands: Solution and Structural Studies. J COORD CHEM 2006. [DOI: 10.1080/00958970008055125] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- Francesco Dallavalle
- a Dipartimento di Chimica Generale ed Inorganica , Chimica Analitica , Chimica, Fisica
| | - Giuseppina Folesani
- a Dipartimento di Chimica Generale ed Inorganica , Chimica Analitica , Chimica, Fisica
| | - Giorgio Pelosi
- a Dipartimento di Chimica Generale ed Inorganica , Chimica Analitica , Chimica, Fisica
| | | | - Gianni Galaverna
- b Dipartimento di Chimica Organica e Industriale , Università di Parma , 43100, Parma, Italy
| | - Roberto Corradini
- b Dipartimento di Chimica Organica e Industriale , Università di Parma , 43100, Parma, Italy
| | - Rosangela Marchelli
- b Dipartimento di Chimica Organica e Industriale , Università di Parma , 43100, Parma, Italy
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Dallavalle F, Folesani G, Leporati E, Abdel-rahman LH. Complex formation equilibria for s‐amino acid amides with nickel(ii) in aqueous solution. J COORD CHEM 2006. [DOI: 10.1080/00958979708230432] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- Francesco Dallavalle
- a Dipartimento di Chimica Generale ed Inorganica , Chimica Analitica, Chimica Fisica dell′Università , Viale delle Scienze, 43100, Parma, Italy
| | - Giuseppina Folesani
- a Dipartimento di Chimica Generale ed Inorganica , Chimica Analitica, Chimica Fisica dell′Università , Viale delle Scienze, 43100, Parma, Italy
| | - Enrico Leporati
- a Dipartimento di Chimica Generale ed Inorganica , Chimica Analitica, Chimica Fisica dell′Università , Viale delle Scienze, 43100, Parma, Italy
| | - Laila H. Abdel-rahman
- b Chemistry Department , South Valley University, Faculty of Science , 82524, Sohag, Egypt
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Dallavalle F, Folesani G, Leporati E, Borromei R. FORMATION EQUILIBRIA OF COPPER(II) TERNARY COMPLEXES WITH (S)-LEUCINEHYDROXAMIC ACID AND (R)- OR (S)-AMINO ACIDS IN AQUEOUS SOLUTION. J COORD CHEM 2006. [DOI: 10.1080/00958979808023075] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- Francesco Dallavalle
- a Dipartimento di Chimica Generate ed Inorganica, Chimica Analitica, Chimiea Fisica , Universitd di Parma , 43100, Parma, Italy
| | - Giuseppina Folesani
- a Dipartimento di Chimica Generate ed Inorganica, Chimica Analitica, Chimiea Fisica , Universitd di Parma , 43100, Parma, Italy
| | - Enrico Leporati
- a Dipartimento di Chimica Generate ed Inorganica, Chimica Analitica, Chimiea Fisica , Universitd di Parma , 43100, Parma, Italy
| | - Renato Borromei
- a Dipartimento di Chimica Generate ed Inorganica, Chimica Analitica, Chimiea Fisica , Universitd di Parma , 43100, Parma, Italy
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23
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Predieri G, Elviri L, Tegoni M, Zagnoni I, Cinti E, Biagi G, Ferruzza S, Leonardi G. Metal chelates of 2-hydroxy-4-methylthiobutanoic acid in animal feeding. Part 2: Further characterizations, in vitro and in vivo investigations. J Inorg Biochem 2005; 99:627-36. [PMID: 15621297 DOI: 10.1016/j.jinorgbio.2004.11.011] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2004] [Revised: 10/25/2004] [Accepted: 11/11/2004] [Indexed: 11/18/2022]
Abstract
The alpha-hydroxyacid 2-hydroxy-4-methylthiobutanoic acid (the so-called methionine hydroxy-analogue, MHA), largely used in animal nutrition as a source of methionine, forms stable metal chelates with divalent metals of formula [{CH(3)SCH(2) CH(2)CH(OH)COO}(2)M].nH(2)O. Protonation and iron(III) and copper(II) complex formation constants have been determined by potentiometry at 25 degrees C. Distribution diagrams show that no free Fe(3+) cations are present in solution at pH>2.5. ESI-MS (Electron-Spray Ionization Mass Spectrometry) investigations carried out both on iron and zinc complexes in solution have evidenced various species with different MHA/metal ratios. In vivo trials were carried out with rats. After receiving a zinc-deficient diet for 3 weeks, animals were fed the same diet added with zinc sulfate or zinc/MHA chelate; the zinc content of faeces was higher (+45%; P<0.05) in sulfate fed rats, whereas zinc retention was higher (+61%; P<0.05) in the Zn/MHA diet. Experiments in vitro with human intestinal Caco-2 cells indicated that the MHA/Fe chelate was taken up by the cells without any apparent toxic effect. The iron uptake was higher than that of iron nitrilotriacetate (Fe(3+)NTA), an effective chelate for delivering iron to milk diets. In conclusion, these data indicate that the use of MHA chelates could be a valuable tool to increase bioavailability of trace minerals and reduce the environmental impact of animal manure.
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Affiliation(s)
- Giovanni Predieri
- Dipartimento di Chimica G.I.A.F., Universitá di Parma, Parco Area delle Scienze 17/A, 43100 Parma, Italy.
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Ferloni E, Lanfranchi M, Marchiò L, Metta G, Pellinghelli MA, Tegoni M. Structure, solution equilibria and magnetic properties of copper(II) complexes with new sulfurated triazoline derivatives of α-amino acids. Inorganica Chim Acta 2005. [DOI: 10.1016/j.ica.2004.08.016] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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25
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Galaverna G, Pantò F, Dossena A, Marchelli R, Bigi F. Chiral separation of unmodified α-hydroxy acids by ligand exchange HPLC using chiral copper(II) complexes of (S)-phenylalaninamide as additives to the eluent. Chirality 2004. [DOI: 10.1002/chir.530070504] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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26
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Natalini B, Marinozzi M, Sardella R, Macchiarulo A, Pellicciari R. Evaluation of the enantiomeric selectivity in the chiral ligand-exchange chromatography of amino acids by a computational model. J Chromatogr A 2004; 1033:363-7. [PMID: 15088759 DOI: 10.1016/j.chroma.2004.01.054] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The chromatographic resolution of enantiomeric amino acids is accomplished on a reversed phase column using aqueous mobile phase containing the chiral reagent N,N-dimethyl-S-phenylalanine-Cu(II). The separation is a result of the whole interaction between the diastereomeric complex surface and the mixed stationary phase realized by the dynamic coating of the RP-18 carbon chains layer. The elution order seems to be related to the different water coordination capability on copper ion in the formation of the mixed ternary complexes.
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Affiliation(s)
- Benedetto Natalini
- Dipartimento di Chimica e Tecnologia del Farmaco, Università degli Studi di Perugia, Via del Liceo 1, 06123 Perugia, Italy.
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27
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Corradini R, Paganuzzi C, Marchelli R, Pagliari S, Sforza S, Dossena A, Galaverna G, Duchateau A. Design and synthesis of fluorescent beta-cyclodextrins for the enantioselective sensing of alpha-amino acids. Chirality 2004; 15 Suppl:S30-9. [PMID: 12884372 DOI: 10.1002/chir.10272] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Fluorescent monofunctionalized beta-cyclodextrins bearing a copper(II) binding side arm and a dansyl group (CD-NH-AA-CH(2)CH(2)NH-DNS) were designed as enantioselective sensors for unmodified alpha-amino acids. The side arm was derived from amino acid synthons (AA = L- and D-phenylalanine (1 and 2), L- and D-phenylglycine (3 and 4), L-proline (5), and L-cyclohexylglycine (6)) and was chosen in order to contain an amide, an amine, and a sulphonamide group. Enantioselectivity was evaluated by addition of copper(II) complexes of D- or L-valine and D- or L-proline. Chiral discrimination in the fluorescence response was observed in all cases, due to a ligand exchange process. The best conditions for these experiments were found to be the use of an excess (10:1) of the copper complex. The cyclodextrin 4 containing a D-phenylglycine unit was found to be poorly enantioselective, as found for 2, suggesting that the best design can be obtained by using L-amino acids. All L-amino acid containing cyclodextrins showed good enantioselectivities, some of which were higher than those already reported for 1. Other analytes related to amino acids were studied using cyclodextrins 1 and 3. Enantiomers of alpha,alpha-disubstituted amino acids, N-methylamino acids, and amino acid amides were found to be discriminated, while beta-phenylalanine and other molecules bearing a poor anchoring group at the alpha-carbon gave poor enantioselectivity. On the basis of the present data a model for the recognition process, based on the formation of ternary diastereomeric complexes, is proposed.
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Affiliation(s)
- R Corradini
- Dipartimento di Chimica Organica e Industriale, Parma, Italy
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28
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Tegoni M, Dallavalle F, Belosi B, Remelli M. Unexpected formation of a copper(ii) 12-metallacrown-4 with (S)-glutamic-γ-hydroxamic acid: a thermodynamic and spectroscopic study in aqueous solution. Dalton Trans 2004:1329-33. [PMID: 15252625 DOI: 10.1039/b316607d] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The equilibria of copper(II) with (S)-glutamic-gamma-hydroxamic acid (H2L) were investigated in aqueous solution by different techniques: glass electrode potentiometry; calorimetry; VIS and CD spectrophotometry; and ES-MS. An unexpected pentacopper(II) 12-metallacrown-4 [Cu5L4H(-4)](2-) was detected, analogous to those well known formed by alpha- and beta-aminohydroxamic acids, but of lower stability. Another five species were found: [CuLH]+; [CuL2H2]; [Cu2L2]; [CuL2H]-; and [CuL2]2-. Their structures are proposed based on both spectroscopic and calorimetric data.
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Affiliation(s)
- Matteo Tegoni
- Dipartimento di Chimica Generale ed Inorganica, Chimica Analitica, Chimica Fisica, Universita di Parma, Parco Area delle Scienze, 17A, 43100 Parma, Italy
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29
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Bacchi A, Carcelli M, Pelizzi C, Pelizzi G, Pelagatti P, Rogolino D, Tegoni M, Viappiani C. Synthesis and spectroscopic and structural characterization of two novel photoactivatable Ca2+ compounds. Inorg Chem 2003; 42:5871-9. [PMID: 12971755 DOI: 10.1021/ic034059t] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Two novel photoactivatable Ca(2+) compounds were synthesized to achieve a fast concentration jump of calcium ions in solution; this is of paramount importance for investigating the physiological cellular response. The light-sensitive ligands 4-(2-nitrophenyl)-3,6-dioxaoctane dioic acid (H2L1) and 4-(4,5-dimethoxy-2-nitrophenyl)-3,6-dioxaoctane dioic acid (H2L2) were generated by multistep syntheses, and the corresponding calcium complexes, Ca1 and Ca2, were isolated and characterized. The solution equilibria of H2L1 and H2L2 with Ca2+ were investigated; for both ligands, the formation of a 1:2 Ca2+/ligand species is detected and the complete characterization is presented. The crystal structures of Ca1 and Ca2 were determined. In Ca1 the solid state assembly is attained by a polymeric association of [(CaL1(H2O))2(mu-OH2)] dimeric units. Each calcium ion coordinates four oxygen atoms of one ligand (two ethereal, one carboxylic, and one bridging carboxylic oxygen atom), one water molecule, one bridging water molecule, and a carboxylate group of the other ligand within the dimer. The octacoordination of the metal is completed by an interaction with the adjacent dimeric unit. The crystal structure of the complex Ca2 does not show a polymeric nature, but it is a centrosymmetric dimer. The coordination number of the metal ion is still 8:4 oxygen atoms of the ligand; 3 water molecules; 1 bridging carboxylate group. A preliminary study of the photochemical features of the complexes Ca1 and Ca2 is reported: photoexcitation by a nanosecond pulsed UV laser induces the cleavage of the ligand. This drastically reduces the affinity of the ligand toward Ca2+, which is then released in solution.
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Affiliation(s)
- Alessia Bacchi
- Dipartimento di Chimica Generale ed Inorganica, Chimica Analitica, Chimica Fisica, Università degli Studi di Parma, Parco Area delle Scienze 17/A, 43100 Parma, Italy
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30
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Abstract
As a follow-up to a series of review articles on enantioselective ligand exchange chromatography, the present contribution critically evaluates achievements in this area of active and successful research which have been reported in the scientific since 1992. Also discussed is enantioselective ligand exchange in electromigration techniques which have developed especially fruitfully during the last decade.
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Affiliation(s)
- Vadim A Davankov
- Institute of Organo-Element Compounds, Russian Academy of Sciences, Vavilov Str. 28, Moscow 119991, Russia.
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31
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Careri M, Dallavalle F, Tegoni M, Zagnoni I. Pentacopper(II) 12-metallacrown-4 complexes with alpha- and beta-aminohydroxamic acids in aqueous solution: a reinvestigation. J Inorg Biochem 2003; 93:174-80. [PMID: 12576279 DOI: 10.1016/s0162-0134(02)00570-6] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A reinvestigation of the equilibria of (S)-alpha-alaninehydroxamic acid (alpha-Alaha) and (R)-aspartic-beta-hydroxamic acid (Asp-beta-ha) with copper(II) was performed in aqueous solution in order to clarify some contradictory literature reports regarding the stoichiometry of the polynuclear complexes formed. beta-Alaninehydroxamic acid (beta-Alaha, HL), for which the formation of a planar 12-metallacrown-4, [Cu(5)L(4)H(-4)](2+), was already reported, was also re-examined for comparison. Among the different techniques used (potentiometry, absorption spectrophotometry, spectropolarimetry and electrospray ionization mass spectrometry), ES data allowed to define unambiguously that all these three ligands form the same pentanuclear species. Therefore it can be concluded that in aqueous solution the hydroxamates of both alpha- and beta-amino acids form 12-metallacrown-4 complexes, and that the formers are less stable.
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Affiliation(s)
- Maria Careri
- Dipartimento di Chimica Generale ed Inorganica, Chimica Analitica, Chimica Fisica, Università di Parma, Parco Area delle Scienze 17A, I-43100 Parma, Italy
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32
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Speciation and structure of copper(II) complexes with (S)-phenylalanine- and (S)-tryptophanhydroxamic acids in methanol/water solution: a combined potentiometric, spectrophotometric, CD and ESI-MS study. Polyhedron 2001. [DOI: 10.1016/s0277-5387(01)00886-5] [Citation(s) in RCA: 41] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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34
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Galaverna G, Corradini R, Dallavalle F, Folesani G, Dossena A, Marchelli R. Chiral separation of amino acids by copper(II) complexes of tetradentate diaminodiamido-type ligands added to the eluent in reversed-phase high-performance liquid chromatography: a ligand exchange mechanism. J Chromatogr A 2001; 922:151-63. [PMID: 11486860 DOI: 10.1016/s0021-9673(01)00909-8] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
In this paper we report a study on the mechanism of the enantiomeric separation of unmodified D,L-amino acids in RP-HPLC by copper(II) complexes of two tetradentate diaminodiamido ligands, (S,S)-N,N'-bis(phenylalanyl)ethanediamine (PheNN-2) and (S,S)-N,N'-bis(methylphenylalanyl)ethanediamine (Me2PheNN-2), added to the eluent. The aim is to investigate whether and how a copper(II) complex with no free equatorial positions can perform chiral discrimination of bidentate analytes such as unmodified amino acids. The problem is approached in a systematic way by: (a) varying the different chromatographic parameters (pH, selector concentration, eluent polarity); (b) performing chiral separation with the selector adsorbed on the stationary phase; (c) studying the ternary complex formation of these ligands with D- and L-amino acids in solution by glass electrode potentiometry and electrospray ionization MS. All the experimental data are consistent with a mechanism of chiral recognition, based on ligand exchange, which involves as selectors the species [Cu2L2H(-2)]2+ and [CuLH(-2)] and proceeds by displacement of two binding sites from the equatorial positions, giving rise to the ternary species [CuLA]+ and [CuLH(-1) A]. The most important factor responsible for chiral discrimination seems to be the affinity of the diastereomeric ternary complexes for the stationary phase since no enantioselectivity is observed in solution.
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Affiliation(s)
- G Galaverna
- Dipartimento di Chimica Organica e Industriale, Università di Parma, Italy
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35
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Abstract
Taking ligand-exchange chromatographic systems as an example, the effect of the stoichiometry of the solute-chiral selector interaction on the efficiency, selectivity and solute peak profile is discussed. Recent achievements and practical applications of chiral ligand-exchange chromatography are also briefly reviewed.
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Affiliation(s)
- A Kurganov
- Institute of Inorganic Chemistry and Analytical Chemistry, J. Gutenberg University, Mainz, Germany
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36
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Dallavalle F, Folesani G, Sabatini A, Tegoni M, Vacca A. Formation equilibria of ternary complexes of copper(II) with (S)-tryptophanhydroxamic acid and both D- and L-amino acids in aqueous solution. Polyhedron 2001. [DOI: 10.1016/s0277-5387(00)00597-0] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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37
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Galaverna G, Corradini R, Dossena A, Chiavaro E, Marchelli R, Dallavalle F, Folesani G. Chiral discrimination of Dns- and unmodified d,l-amino acids by copper(II) complexes of terdentate ligands in high-performance liquid chromatography. J Chromatogr A 1998. [DOI: 10.1016/s0021-9673(98)00783-3] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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38
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Hoffm�ller W, Polborn K, Knizek J, N�th H, Beck W. Metallkomplexe mit biologisch wichtigen Liganden. XCV. ?5- Pentamethylcyclopentadienyl-Rhodium-, -Iridium-, (?6-Benzol)-Ruthenium- und Phosphan-Palladium-Komplexe von Prolinmethylester und Prolinamid. Z Anorg Allg Chem 1997. [DOI: 10.1002/zaac.19976231214] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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39
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Dallavalle F, Folesani G, Leporati E, Galaverna G. Stereoselective Formation of Ternary Copper(II) Complexes of (S)-Amino-acid Amides and (R)- or (S)-Histidine and (R)- or (S)-Tyrosine in Aqueous Solution. Helv Chim Acta 1996. [DOI: 10.1002/hlca.19960790707] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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40
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Galaverna G, Corradini R, Dossena A, Marchelli R, Dallavalle F. Copper(II) complexes of N2-alkyl-(S)-amino acid amides as chiral selectors for dynamically coated chiral stationary phases in RP-HPLC. Chirality 1996; 8:189-96. [PMID: 8857180 DOI: 10.1002/(sici)1520-636x(1996)8:2<189::aid-chir3>3.0.co;2-e] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Copper(II) complexes of N2-octyl-(S)-phenylalaninamide (Noc-Phe-NH2), N2-dodecyl-(S)-phenylalaninamide (Ndo-Phe-NH2), and N2-octyl-(S)-norleucinamide (Noc-NLeu-NH2), dynamically adsorbed on a reversed-phase C18 column, were able to perform the direct enantiomeric separation of unmodified amino acids, amino acid amides and esters, hydroxy acids, and dipeptides by elution with aqueous or mixed aqueous-organic solutions containing copper(II) sulphate or acetate. The role played by several parameters in the separation procedure was examined with the copper(II) complex of Noc-Phe-NH2 [concentration of the copper(II) ion in the eluent, pH and eluent polarity, amount of adsorbed selector]. The separation was shown to occur entirely on the stationary phase. The mechanism of chiral discrimination is discussed in terms of the chromatographic parameters and of the structure of the copper(II) complexes in solution and in the solid state. The chiral stationary phase maintained its separation ability for about 3 months. However, the column could be easily restored by recovering the selector with methanol and repeating the loading procedure.
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Affiliation(s)
- G Galaverna
- Dipartimento di Chimica Organica e Industriale, Universita di Parma, Italy
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41
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Dallavalle F, Folesani G, Bertuzzi T, Corradini R, Marchelli R. Copper(II) complexes of potentially terdentateN2-[(R)-2-hydroxypropyl]- andN2-[(S)-2-hydroxypropyl]-(S)-phenylalaninamide for chiral recognition: Synthesis of the Ligands and Formation Constants. Helv Chim Acta 1995. [DOI: 10.1002/hlca.19950780712] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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