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Belmont-Sánchez JC, Choquesillo-Lazarte D, García-Rubiño ME, Matilla-Hernández A, Niclós-Gutiérrez J, Castiñeiras A, Frontera A. Supramolecular Nature of Multicomponent Crystals Formed from 2,2'-Thiodiacetic Acid with 2,6-Diaminopurine or N9-(2-Hydroxyethyl)adenine. Int J Mol Sci 2023; 24:17381. [PMID: 38139210 PMCID: PMC10743529 DOI: 10.3390/ijms242417381] [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: 11/14/2023] [Revised: 12/05/2023] [Accepted: 12/08/2023] [Indexed: 12/24/2023] Open
Abstract
The synthesis and characterization of the multicomponent crystals formed by 2,2'-thiodiacetic acid (H2tda) and 2,6-diaminopurine (Hdap) or N9-(2-hydroxyethyl)adenine (9heade) are detailed in this report. These crystals exist in a salt rather than a co-crystal form, as confirmed by single crystal X-ray diffractometry, which reflects their ionic nature. This analysis confirmed proton transfer from the 2,2'-thiodiacetic acid to the basic groups of the coformers. The new multicomponent crystals have molecular formulas [(H9heade+)(Htda-)] 1 and [(H2dap+)2(tda2-)]·2H2O 2. These were also characterized using FTIR, 1H and 13C NMR and mass spectroscopies, elemental analysis, and thermogravimetric/differential scanning calorimetry (TG/DSC) analyses. In the crystal packing the ions interact with each other via O-H⋯N, O-H⋯O, N-H⋯O, and N-H⋯N hydrogen bonds, generating cyclic hydrogen-bonded motifs with graph-set notation of R22(16), R22(10), R32(10), R33(10), R22(9), R32(8), and R42(8), to form different supramolecular homo- and hetero-synthons. In addition, in the crystal packing of 2, pairs of diaminopurinium ions display a strong anti-parallel π,π-stacking interaction, characterized by short inter-centroids and interplanar distances (3.39 and 3.24 Å, respectively) and a fairly tight angle (17.5°). These assemblies were further analyzed energetically using DFT calculations, MEP surface analysis, and QTAIM characterization.
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Affiliation(s)
| | - Duane Choquesillo-Lazarte
- Laboratorio de Estudios Cristalográficos, IACT, CSIC-Universidad de Granada, Av. de las Palmeras 4, 18100 Armilla, Granada, Spain;
| | | | - Antonio Matilla-Hernández
- Department of Inorganic Chemistry, Faculty of Pharmacy, University of Granada, 18071 Granada, Spain; (J.C.B.-S.); (J.N.-G.)
| | - Juan Niclós-Gutiérrez
- Department of Inorganic Chemistry, Faculty of Pharmacy, University of Granada, 18071 Granada, Spain; (J.C.B.-S.); (J.N.-G.)
| | - Alfonso Castiñeiras
- Department of Inorganic Chemistry, Faculty of Pharmacy, University of Santiago de Compostela, 15782 Santiago de Compostela, Spain
| | - Antonio Frontera
- Department de Química, Universitat de les Illes Balears, Crta. de Valldemossa km 7.5, 07122 Palma de Mallorca, Spain;
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2
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Mousavi H, García-Rubiño ME, Choquesillo-Lazarte D, Castiñeiras A, Lezama L, Frontera A, Niclós-Gutiérrez J. H(N3)dap (Hdap = 2,6-Diaminopurine) Recognition by Cu 2(EGTA): Structure, Physical Properties, and Density Functional Theory Calculations of [Cu 4(μ-EGTA) 2(μ-H(N3)dap) 2(H 2O) 2]·7H 2O. Molecules 2023; 28:6263. [PMID: 37687091 PMCID: PMC10488833 DOI: 10.3390/molecules28176263] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2023] [Revised: 08/22/2023] [Accepted: 08/25/2023] [Indexed: 09/10/2023] Open
Abstract
Reactions in water between the Cu2(µ-EGTA) chelate (EGTA = ethylene-bis(oxyethyleneimino)tetraacetate(4-) ion) and Hdap in molar ratios 1:1 and 1:2 yield only blue crystals of the ternary compound [Cu4(μ-EGTA)2(μ-H(N3)dap)2(H2O)2]·7H2O (1), which has been studied via single-crystal X-ray diffraction and various physical methods (thermal stability, spectral and magnetic properties), as well as DFT theoretical calculations. In the crystal, uncoordinated water is disordered. The tetranuclear complex molecule also has some irrelevant disorder in an EGTA-ethylene moiety. In the complex molecule, both bridging organic molecules act as binucleating ligands. There are two distorted five- and two six-coordinated Cu(II) centers. Each half of EGTA acts as a tripodal tetradentate Cu(II) chelator, with a mer-NO2 + O(ether, distal) conformation. Hdap exhibits the tautomer H(N3)dap, with the dissociable H-atom on its less basic N-heterocyclic atom. These features favor the efficient cooperation between Cu-N7 or Cu-N9 bonds with appropriate O-EGTA atoms, as N6-H···O or N3-H···O interligand interactions, respectively. The bridging role of both organics determines the tetranuclear dimensionality of the complex. In this crystal, such molecules associate in zig-zag chains built by alternating π-π interactions between the five- or six-atom rings of Hdap ligands of adjacent molecules. DFT theoretical calculations (using two different theoretical models and characterized by the quantum theory of "atoms in molecules") reveal the importance of these π-π interactions between Hdap ligands, as well as those corresponding to the referred hydrogen bonds in the contributed tetranuclear molecule.
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Affiliation(s)
- Homa Mousavi
- Department of Inorganic Chemistry, Faculty of Pharmacy, University of Granada, 18071 Granada, Spain;
| | | | - Duane Choquesillo-Lazarte
- Laboratorio de Estudios Cristalográficos, IACT, CSIC-Universidad de Granada, Avda. de las Palmeras 4, 18100 Armilla, Spain;
| | - Alfonso Castiñeiras
- Department of Inorganic Chemistry, Faculty of Pharmacy, University of Santiago de Compostela, 15782 Santiago de Compostela, Spain;
| | - Luis Lezama
- Departamento de Química Orgánica e Inorgánica, Facultad de Ciencia y Tecnología, Universidad del País Vasco, UPV/EHU, 48940 Leioa, Spain;
| | - Antonio Frontera
- Departament de Química, Universitat de les Illes Balears, Crta. de Valldemossa km 7.5, 07122 Palma de Mallorca, Spain;
| | - Juan Niclós-Gutiérrez
- Department of Inorganic Chemistry, Faculty of Pharmacy, University of Granada, 18071 Granada, Spain;
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3
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Rosales-Martínez C, Matilla-Hernádez A, Choquesillo-Lazarte D, Frontera A, Castiñeiras A, Niclós-Gutiérrez J. The Copper(II)-Thiodiacetate (tda) Chelate as Efficient Receptor of N9-(2-Hydroxyethyl)Adenine (9heade): Synthesis, Molecular and Crystal Structures, Physical Properties and DFT Calculations of [Cu(tda)(9heade)(H 2O)]·2H 2O. Molecules 2023; 28:5830. [PMID: 37570799 PMCID: PMC10420684 DOI: 10.3390/molecules28155830] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2023] [Revised: 07/25/2023] [Accepted: 07/27/2023] [Indexed: 08/13/2023] Open
Abstract
Considering that Cu(tda) chelate (tda: dithioacetate) is a receptor for adenine and related 6-aminopurines, this study reports on the synthesis, molecular and crystal structures, thermal stability, spectral properties and DFT calculations related to [Cu(tda)(9heade)(H2O)]·2H2O (1) [9heade: N9-(2-hydroxyethyl)adenine]. Concerning the molecular recognition of (metal chelate)-(adenine synthetic nucleoside), 1 represents an unprecedented metal binding pattern (MBP) for 9heade. However, unprecedentedly, the Cu(tda)-9heade molecular recognition in 1 is essentially featured in the Cu-N1(9heade) bond, without any N6-H⋯O(carboxyl tda) interligand interaction. Nevertheless, N1 being the most basic donor for N9-substituted adenines, this Cu-N1 bond is now assisted by an O2-water-mediated interaction (N6-H⋯O2 and O2⋯Cu weak contact). Also, in the crystal packing, the O-H(ol) of 9heade interacts with its own adenine moiety as a result of an O3-water-mediated interaction (O(ol)-H⋯O3 plus O3-H36⋯π(adenine moiety)). Both water-mediated interactions seem to be responsible for serious alterations in the physical properties of crystalline or grounded samples. Density functional theory calculations were used to evaluate the interactions energetically. Moreover, the quantum theory of atoms-in-molecules (QTAIM), in combination with the noncovalent interaction plot (NCIPlot), was used to analyze the interactions and rationalize the existence and relative importance of hydrogen bonding, chalcogen bonding and π-stacking interactions. The novelty of this work resides in the discovery of a novel binding mode for N9-(2-hydroxyethyl)adenine. Moreover, the investigation of the important role of water in the solid state of 1 is also relevant, along with the chalcogen bonding interactions demonstrated by the density functional theory (DFT) study.
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Affiliation(s)
- Carmen Rosales-Martínez
- Department of Inorganic Chemistry, Faculty of Pharmacy, University of Granada, 18071 Granada, Spain; (C.R.-M.); (A.M.-H.)
| | - Antonio Matilla-Hernádez
- Department of Inorganic Chemistry, Faculty of Pharmacy, University of Granada, 18071 Granada, Spain; (C.R.-M.); (A.M.-H.)
| | - Duane Choquesillo-Lazarte
- Laboratorio de Estudios Cristalográficos, IACT, CSIC-Universidad de Granada, Avda. de las Palmeras 4, Armilla, 18100 Granada, Spain;
| | - Antonio Frontera
- Departament de Química, Universitat de les Illes Balears, Crta. de Valldemossa km 7.5, 07122 Palma de Mallorca, Spain;
| | - Alfonso Castiñeiras
- Department of Inorganic Chemistry, Faculty of Pharmacy, University of Santiago de Compostela, 15782 Santiago de Compostela, Spain;
| | - Juan Niclós-Gutiérrez
- Department of Inorganic Chemistry, Faculty of Pharmacy, University of Granada, 18071 Granada, Spain; (C.R.-M.); (A.M.-H.)
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Kumar Patel D, Domínguez-Martín A, Choquesillo-Lazarte D, González-Pérez JM, Niclós-Gutiérrez J. Synthesis, characterization, and quantum chemical study of cobalt(II) chelates with N-phenethyl-iminodiacetate(2-)-like ligands. Influence of p-( R)-phenethyl group on crystal pattern. J COORD CHEM 2022. [DOI: 10.1080/00958972.2022.2140407] [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: 11/06/2022]
Affiliation(s)
- Dheerendra Kumar Patel
- Department of Inorganic Chemistry, Faculty of Pharmacy, University of Granada, Granada, Spain
| | - Alicia Domínguez-Martín
- Department of Inorganic Chemistry, Faculty of Pharmacy, University of Granada, Granada, Spain
| | | | | | - Juan Niclós-Gutiérrez
- Department of Inorganic Chemistry, Faculty of Pharmacy, University of Granada, Granada, Spain
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5
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Domínguez-Martín A, Niclós-Gutiérrez J. Special issue celebrating bioinorganic chemistry research networks in Spain. J Inorg Biochem 2020; 207:111068. [PMID: 32387888 DOI: 10.1016/j.jinorgbio.2020.111068] [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: 10/24/2022]
Affiliation(s)
| | - Juan Niclós-Gutiérrez
- Department of Inorganic Chemistry, Faculty of Pharmacy, University of Granada, Spain.
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Alvarez-Lorenzo C, Castiñeiras A, Frontera A, García-Santos I, González-Pérez JM, Niclós-Gutiérrez J, Rodríguez-González I, Vílchez-Rodríguez E, Zaręba JK. Recurrent motifs in pharmaceutical cocrystals involving glycolic acid: X-ray characterization, Hirshfeld surface analysis and DFT calculations. CrystEngComm 2020. [DOI: 10.1039/d0ce01064b] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Crystallization studies on some pyridinecarboxamides and methylated xanthines with glycolic acid as coformer, were carried out on formation of synthons and their influence on stability and solubility, the energy landscape and stabilization energies.
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Affiliation(s)
- C. Alvarez-Lorenzo
- Department of Pharmacy and Pharmaceutical Technology
- Faculty of Pharmacy
- University of Santiago de Compostela
- 15782 Santiago de Compostela
- Spain
| | - A. Castiñeiras
- Department of Inorganic Chemistry
- Faculty of Pharmacy
- University of Santiago de Compostela
- 15782 Santiago de Compostela
- Spain
| | - A. Frontera
- Departament de Química
- Universitat de les Illes Balears
- 07122 Palma de Mallorca
- Spain
| | - I. García-Santos
- Department of Inorganic Chemistry
- Faculty of Pharmacy
- University of Santiago de Compostela
- 15782 Santiago de Compostela
- Spain
| | - J. M. González-Pérez
- Department of Inorganic Chemistry
- Faculty of Pharmacy
- University of Granada
- 18071 Granada
- Spain
| | - J. Niclós-Gutiérrez
- Department of Inorganic Chemistry
- Faculty of Pharmacy
- University of Granada
- 18071 Granada
- Spain
| | - I. Rodríguez-González
- Department of Inorganic Chemistry
- Faculty of Pharmacy
- University of Santiago de Compostela
- 15782 Santiago de Compostela
- Spain
| | - E. Vílchez-Rodríguez
- Department of Inorganic Chemistry
- Faculty of Pharmacy
- University of Santiago de Compostela
- 15782 Santiago de Compostela
- Spain
| | - J. K. Zaręba
- Advanced Materials Engineering and Modelling Group
- Wrocław University of Science and Technology
- Wrocław
- Poland
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7
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Ruiz-González N, García-Rubiño ME, Domínguez-Martín A, Choquesillo-Lazarte D, Franconetti A, Frontera A, Castiñeiras A, González-Pérez JM, Niclós-Gutiérrez J. Molecular and supramolecular recognition patterns in ternary copper(II) or zinc(II) complexes with selected rigid-planar chelators and a synthetic adenine-nucleoside. J Inorg Biochem 2019; 203:110920. [PMID: 31760232 DOI: 10.1016/j.jinorgbio.2019.110920] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2019] [Revised: 11/06/2019] [Accepted: 11/11/2019] [Indexed: 11/25/2022]
Abstract
Four ternary metal-complexes with Cu(II) or Zn(II), 2,6-pyridine-dicarboxylate (pdc) or glycyl-glycinate (GG) and the synthetic nucleoside 9-(2-hydroxyethyl)adenine (9heade) have been synthesized and studied by single-crystal X-ray diffraction and other physical methods. Relevant supramolecular assemblies found in the solid state structures have been further studied using density functional theory (DFT) calculations. In addition, the energetic features of the non-covalent interactions as well as the cooperativity effects have been calculated and characterized using the non-covalent interaction plot computational tool. Compounds trans-[Cu(pdc)(9heade)(H2O)2]·3H2O (1a) and [Cu(pdc)(9heade)(H2O)]·H2O (1b), trans-[Zn(pdc)(9heade)(H2O)2] (2), share the same molecular recognition pattern consisting in the cooperation of the metal-N7(9heade) bond and an interligand (9heade)N6-H···O(pdc) interaction, regardless of the nature of the metal, the coordination environment and the water content. At a supramolecular level, these compounds exhibit pairs of complex molecules linked by H-bonds and interesting anion-π/π-π/π-anion assemblies (in 1a and 1b) or the unprecedented π-π interactions (in 2), involving the purine moieties or the exocyclic -6NH2 purine groups, respectively. Compound 3, {[Cu(GG)(9heade)(H2O)·Cu(GG)(μ2-9heade)]·8H2O}n, consists in asymmetric dinuclear complex units (Cu···Cu 7.83 Å) that connect with adjacent ones by pairs of very weak Cu-O(carboxylate) bonds (Cu···Cu 3.81 Å) building a polymeric chain. The supramolecular transition from a single molecule to dinuclear units and finally a polymeric chain is also observed in the electron paramagnetic resonance spectra and discussed from a structural point of view as well as by DFT calculations. The unprecedented N7 and μ-N7,O(ol) metal binding patterns of 9heade differs from that recently reported (μ-N1,N7) in a Cd(II) polymer.
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Affiliation(s)
- Noelia Ruiz-González
- Department of Inorganic Chemistry, Faculty of Pharmacy, University of Granada, E-18071 Granada, Spain
| | - M Eugenia García-Rubiño
- Department of Physical Chemistry, Faculty of Pharmacy, University of Granada, E-18071 Granada, Spain
| | - Alicia Domínguez-Martín
- Department of Inorganic Chemistry, Faculty of Pharmacy, University of Granada, E-18071 Granada, Spain
| | - Duane Choquesillo-Lazarte
- Laboratorio de Estudios Cristalográficos, IACT (CSIC-UGR), Avda. de las Palmeras 4, 18100 Armilla, Granada, Spain
| | - Antonio Franconetti
- Department of Chemistry, Faculty of Chemical Science, University of Balearic Island, E-07112 Palma, Mallorca, Spain
| | - Antonio Frontera
- Department of Chemistry, Faculty of Chemical Science, University of Balearic Island, E-07112 Palma, Mallorca, Spain
| | - Alfonso Castiñeiras
- Department of Inorganic Chemistry, Faculty of Pharmacy, University of Santiago de Compostela, E-15782 Santiago de Compostela, Spain
| | - Josefa M González-Pérez
- Department of Inorganic Chemistry, Faculty of Pharmacy, University of Granada, E-18071 Granada, Spain
| | - Juan Niclós-Gutiérrez
- Department of Inorganic Chemistry, Faculty of Pharmacy, University of Granada, E-18071 Granada, Spain.
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8
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Pérez-Toro I, Domínguez-Martín A, Choquesillo-Lazarte D, García-Rubiño ME, González-Pérez JM, Castiñeiras A, Bauzá A, Frontera A, Niclós-Gutiérrez J. Copper(II) polyamine chelates as efficient receptors for acyclovir: syntheses, crystal structures and dft study. Polyhedron 2018. [DOI: 10.1016/j.poly.2018.02.011] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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9
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González-Pérez JM, Choquesillo-Lazarte D, Domínguez-Martín A, Vílchez-Rodríguez E, Pérez-Toro I, Castiñeiras A, Arriortua OK, García-Rubiño ME, Matilla-Hernández A, Niclós-Gutiérrez J. Metal binding pattern of acyclovir in ternary copper(II) complexes having an S-thioether or S-disulfide NO2S-tripodal tetradentate chelator. Inorganica Chim Acta 2016. [DOI: 10.1016/j.ica.2016.05.005] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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10
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Serrano-Braceras M, Choquesillo-Lazarte D, Domínguez-Martín A, Vílchez-Rodríguez E, García-Rubiño ME, González-Pérez JM, Castiñeiras A, Niclós-Gutiérrez J. Metal complexes with N-(trifluoromethylbenzyl)iminodiacetate chelators (x-3F ligands). Part I. Copper(II) chelates of p-3F, m-3F, and o-3F with or without imidazole-like ligands. J COORD CHEM 2015. [DOI: 10.1080/00958972.2015.1062092] [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: 10/23/2022]
Affiliation(s)
- Marina Serrano-Braceras
- Department of Inorganic Chemistry, Faculty of Pharmacy, University of Granada, Granada, Spain
| | | | - Alicia Domínguez-Martín
- Department of Inorganic Chemistry, Faculty of Pharmacy, University of Granada, Granada, Spain
| | - Ester Vílchez-Rodríguez
- Department of Inorganic Chemistry, Faculty of Pharmacy, University of Granada, Granada, Spain
| | - María Eugenia García-Rubiño
- Department of Pharmaceutical and Organic Chemistry, Faculty of Pharmacy, University of Granada, Granada, Spain
| | | | - Alfonso Castiñeiras
- Faculty of Pharmacy, Department of Inorganic Chemistry, University of Santiago de Compostela, Santiago de Compostela, Spain
| | - Juan Niclós-Gutiérrez
- Department of Inorganic Chemistry, Faculty of Pharmacy, University of Granada, Granada, Spain
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11
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Lachowicz JI, Nurchi VM, Crisponi G, Jaraquemada-Pelaez MDG, Ostrowska M, Jezierska J, Gumienna-Kontecka E, Peana M, Zoroddu MA, Choquesillo-Lazarte D, Niclós-Gutiérrez J, González-Pérez JM. Zinc(II) and copper(II) complexes with hydroxypyrone iron chelators. J Inorg Biochem 2015; 151:94-106. [PMID: 26281974 DOI: 10.1016/j.jinorgbio.2015.08.011] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2015] [Revised: 08/05/2015] [Accepted: 08/06/2015] [Indexed: 12/20/2022]
Abstract
High stability of the complexes formed at physiological pH is one of the basic requisites that a good iron chelator must possess. At the same time the chelating agent must be selective toward iron, i.e., the stability of iron complexes must be significantly higher than that of the complexes formed with essential metal ions, in order that these last ones do not perturb iron chelation. In the frame of our research on iron chelators we have designed and synthesized a series of tetradentate derivatives of kojic acid, and examined their binding properties toward Fe(3+) and Al(3+). In this paper, for a characterization of the behavior of the proposed iron chelating agents in biological fluids, their complex formation equilibria with copper(II) and zinc(II) ions have been fully characterized together with a speciation study, showing the degree at which the iron chelators interfere with the homeostatic equilibria of these two essential metal ions.
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Affiliation(s)
- Joanna Izabela Lachowicz
- Department of Chemistry and Geology, University of Cagliari, Cittadella Universitaria, 09042 Monserrato, Cagliari, Italy.
| | - Valeria Marina Nurchi
- Department of Chemistry and Geology, University of Cagliari, Cittadella Universitaria, 09042 Monserrato, Cagliari, Italy
| | - Guido Crisponi
- Department of Chemistry and Geology, University of Cagliari, Cittadella Universitaria, 09042 Monserrato, Cagliari, Italy
| | | | - Małgorzata Ostrowska
- Faculty of Chemistry, University of Wrocław, Joliot-Curie Street 14, 50-383 Wrocław, Poland
| | - Julia Jezierska
- Faculty of Chemistry, University of Wrocław, Joliot-Curie Street 14, 50-383 Wrocław, Poland
| | | | - Massimiliano Peana
- Department of Chemistry and Pharmacy, University of Sassari, Via Vienna 2, 07100 Sassari, Italy
| | | | - Duane Choquesillo-Lazarte
- Laboratorio de Estudios Cristalográficos, IACT, CSIC-Universidad de Granada, Av. de las Palmeras 4, E-18100 Armilla, Granada, Spain
| | - Juan Niclós-Gutiérrez
- Department of Inorganic Chemistry, Faculty of Pharmacy, Campus Cartuja, University of Granada, E-18071 Granada, Spain
| | - Josefa Maria González-Pérez
- Department of Inorganic Chemistry, Faculty of Pharmacy, Campus Cartuja, University of Granada, E-18071 Granada, Spain
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12
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González-Pérez JM, Choquesillo-Lazarte D, Domínguez-Martín A, El Bakkali H, García-Rubiño ME, Pérez-Toro I, Vílchez-Rodríguez E, Castiñeiras A, Nurchi VM, Niclós-Gutiérrez J. Molecular recognition between adenine or 2,6-diaminopurine and copper(II) chelates with N,O2,S-tripodal tetradentate chelators having thioether or disulfide donor groups. J Inorg Biochem 2015; 151:75-86. [PMID: 26190672 DOI: 10.1016/j.jinorgbio.2015.05.014] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [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: 01/22/2015] [Revised: 05/26/2015] [Accepted: 05/29/2015] [Indexed: 11/18/2022]
Abstract
Five novel ternary copper(II) complexes with the N,O2,S-tripodal tetradentate chelators N,N-bis(carboxymethyl)-S-benzylcysteaminate(2-) ion (BCBC) or N,N,N',N'-tetrakis(carboxymethyl)cystaminate(4-) ion (TCC) and adenine (Hade), 2,6-diaminopurine (Hdap), 2,2'-bipyridine (bpy) or 1,10-phenanthroline (phen) as co-ligand were synthesized and characterized by X-ray diffraction and other physical methods: [Cu2(BCBC)2(μ2-N3,N7-H(N9)ade)(H2O)2]·H2O (1), [Cu2(BCBC)2(μ2-N7,N9-H(N3)dap)(H2O)2]·4H2O (2), [Cu2(μ2-TCC)(H(N9)ade)2(H2O)2]·10H2O (3), [Cu2(μ2-TCC)(bpy)2]·15H2O (4) and [Cu2(μ2-TCC)(phen)2]·14H2O (5). The crystal structure of H4TCC·3H2O was also determined. All ternary Cu(II) complexes have molecular structures. The N-(2-mercaptoethyl)-iminodiacetate moieties of BCBC or TCC ligands play a NO2+S-tripodal tetradentate role, with the S-(thioether or disulfide) atom as the apical/distal donor of the copper(II) center. In 1-3, the iminodiacetate moiety exhibits a mer-NO2 conformation (two nearly coplanar chelate rings) while in 4 and 5 (with bpy or phen as coligand) it displays a fac-NO+O (apical/distal) conformation. We conclude that the formation of the Cu-S(thioether or disulfide) bonds is strongly favored by the N-branched topology of the S-ligands in the reported compounds.
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Affiliation(s)
| | - Duane Choquesillo-Lazarte
- Laboratorio de Estudios Cristalográficos, IACT, CSIC-University of Granada, Avenida de las Palmeras 4, Armilla 18100 Granada, Spain
| | - Alicia Domínguez-Martín
- Department of Inorganic Chemistry, Faculty of Pharmacy, University of Granada, 18071 Granada, Spain.
| | - Hanan El Bakkali
- Department of Inorganic Chemistry, Faculty of Pharmacy, University of Granada, 18071 Granada, Spain
| | - María Eugenia García-Rubiño
- Department of Organic and Pharmaceutical Chemistry, Faculty of Pharmacy, University of Granada, 18071 Granada, Spain
| | - Inmaculada Pérez-Toro
- Department of Inorganic Chemistry, Faculty of Pharmacy, University of Granada, 18071 Granada, Spain
| | - Ester Vílchez-Rodríguez
- Department of Inorganic Chemistry, Faculty of Pharmacy, University of Granada, 18071 Granada, Spain
| | - Alfonso Castiñeiras
- Department of Inorganic Chemistry, Faculty of Pharmacy, University of Santiago de Compostela, 15782 Santiago de Compostela, Spain
| | - Valeria Marina Nurchi
- Dipartimento di Scienze Chimiche e Geologiche, Università di Cagliari, Cittadela Universitaria, 09042 Monserrato, CA, Italy
| | - Juan Niclós-Gutiérrez
- Department of Inorganic Chemistry, Faculty of Pharmacy, University of Granada, 18071 Granada, Spain
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Pérez-Toro I, Domínguez-Martín A, Choquesillo-Lazarte D, Vílchez-Rodríguez E, González-Pérez JM, Castiñeiras A, Niclós-Gutiérrez J. Lights and shadows in the challenge of binding acyclovir, a synthetic purine-like nucleoside with antiviral activity, at an apical-distal coordination site in copper(II)-polyamine chelates. J Inorg Biochem 2015; 148:84-92. [PMID: 25863571 DOI: 10.1016/j.jinorgbio.2015.03.006] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2014] [Revised: 03/08/2015] [Accepted: 03/09/2015] [Indexed: 11/25/2022]
Abstract
Several nucleic acid components and their metal complexes are known to be involved in crucial metabolic steps. Therefore the study of metal-nucleic acid interactions becomes essential to understand these biological processes. In this work, the synthetic purine-like nucleoside acyclovir (acv) has been used as a model of guanosine recognition with copper(II)-polyamine chelates. The chemical stability of the N9-acyclic arm in acv offers the possibility to use this antiviral drug to deepen the knowledge of metal-nucleoside interactions. Cu(II) chelates with cyclam, cyclen and trien were used as suitable receptors. All these copper(II) tetraamine chelates have in common the potential ability to yield a Cu-N7(apical) bond assisted by an appropriate (amine)N-H⋯O6(acv) intra-molecular interligand interaction. A series of synthesis afforded the following compounds: [Cu(cyclam)(ClO4)2] (1), {[Cu(cyclam)(μ2-NO3)](NO3)}n (2), {[Cu(cyclam)(μ2-SO4)]·MeOH}n (3), {[Cu(cyclam)(μ2-SO4)]·5H2O}n (4), [Cu(cyclen)(H2O)]SO4·2H2O (5), [Cu(cyclen)(H2O)]SO4·3H2O (6), [Cu(trien)(acv)](NO3)2·acv (7) and [Cu(trien)(acv)]SO4·0.71H2O (8). All these compounds have been characterized by X-ray crystallography and FT-IR spectroscopy. Our results reveal that the macrochelates Cu(cyclen)(2+) and Cu(cyclam)(2+) are unable to bind acv at an apical site. In contrast, the Cu(trien)(2+) complex has proved to be an efficient receptor for acv in compounds (7) and (8). In the ternary complex [Cu(trien)(acv)](2+), the metal binding pattern of acv consists of an apical Cu-N7 bond assisted by an intra-molecular (primary amino)N-H⋯O6(acv) interligand interaction. Structural comparisons reveal that this unprecedented apical role of acv is due to the acyclic nature of trien together with the ability of the Cu(trien)(2+) chelate to generate five-coordinated (type 4+1) copper(II) complexes.
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Affiliation(s)
- Inmaculada Pérez-Toro
- Department of Inorganic Chemistry, Faculty of Pharmacy, University of Granada, 18071 Granada, Spain
| | - Alicia Domínguez-Martín
- Department of Inorganic Chemistry, Faculty of Pharmacy, University of Granada, 18071 Granada, Spain.
| | - Duane Choquesillo-Lazarte
- Laboratorio de Estudios Cristalográficos, IACT, CSIC-Universidad de Granada, Av. de las Palmeras 4, E-18100 Armilla, Granada, Spain
| | - Esther Vílchez-Rodríguez
- Department of Inorganic Chemistry, Faculty of Pharmacy, University of Granada, 18071 Granada, Spain
| | | | - Alfonso Castiñeiras
- Department of Inorganic Chemistry, Faculty of Pharmacy, University of Santiago de Compostela, 15782 Santiago de Compostela, Spain
| | - Juan Niclós-Gutiérrez
- Department of Inorganic Chemistry, Faculty of Pharmacy, University of Granada, 18071 Granada, Spain
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Nurchi VM, Crisponi G, Arca M, Crespo-Alonso M, Lachowicz JI, Mansoori D, Toso L, Pichiri G, Amelia Santos M, Marques SM, Niclós-Gutiérrez J, González-Pérez JM, Domínguez-Martín A, Choquesillo-Lazarte D, Szewczuk Z, Antonietta Zoroddu M, Peana M. A new bis-3-hydroxy-4-pyrone as a potential therapeutic iron chelating agent. Effect of connecting and side chains on the complex structures and metal ion selectivity. J Inorg Biochem 2014; 141:132-143. [DOI: 10.1016/j.jinorgbio.2014.09.002] [Citation(s) in RCA: 24] [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] [Received: 06/02/2014] [Revised: 09/03/2014] [Accepted: 09/03/2014] [Indexed: 01/02/2023]
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El Bakkali H, Domínguez-Martín A, Choquesillo-Lazarte D, Vílchez-Rodríguez E, González-Pérez JM, Castiñeiras A, Niclós-Gutiérrez J. Unprecedented 4/5-methylimidazole linkage isomerism within a binuclear copper(II) complex molecule. INORG CHEM COMMUN 2014. [DOI: 10.1016/j.inoche.2014.01.010] [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: 11/26/2022]
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Domínguez-Martín A, Choquesillo-Lazarte D, Dobado JA, Vidal I, Lezama L, González-Pérez JM, Castiñeiras A, Niclós-Gutiérrez J. From 7-azaindole to adenine: molecular recognition aspects on mixed-ligand Cu(II) complexes with deaza-adenine ligands. Dalton Trans 2013; 42:6119-30. [PMID: 23324859 DOI: 10.1039/c2dt32191b] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
For a better understanding of the versatile behaviour of adenine as a ligand, a series of 10 ternary copper(II) complexes with deaza-adenine ligands [7-azaindole (1,6,7-trideaza-adenine, H7azain), 4-azabenzimidazole (1,6-dideaza-adenine, H4abim), 5-azabenzimidazole (3,6-dideaza-adenine, H5abim), and 7-deaza-adenine (H7deaA)] have been synthesised and characterised by X-ray diffraction. Likewise, all the compounds studied have been analysed by spectral and thermal methods. The proton tautomers and donor capabilities of the above-mentioned deaza-adenine ligands have been calculated by DFT. We conclude that the increasing presence of N-donors in deaza-adenine ligands favours the proton tautomerism and their versatility as co-ligands. Notably, H7azain consistently uses the same tautomer, H4abim uses two different tautomers but is not protonated by the pentadentate H(2)EDTA(2-) ligand, and H(N1)5abim displays the μ(2)-N7,N9 mode, whereas H(N9)7deaA binds Cu(II) by N3 in cooperation with an intra-molecular N9-H···O interaction or using the unprecedented bidentate μ(2)-N1,N3 bridging mode.
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Affiliation(s)
- Alicia Domínguez-Martín
- Department of Inorganic Chemistry, Faculty of Pharmacy, University of Granada, Campus Cartuja s/n, 18071 Granada, Spain.
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Domínguez-Martín A, García-Raso A, Cabot C, Choquesillo-Lazarte D, Pérez-Toro I, Matilla-Hernández A, Castiñeiras A, Niclós-Gutiérrez J. Structural insights on the molecular recognition patterns between N(6)-substituted adenines and N-(aryl-methyl)iminodiacetate copper(II) chelates. J Inorg Biochem 2013; 127:141-9. [PMID: 23490423 DOI: 10.1016/j.jinorgbio.2013.02.002] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2012] [Revised: 02/07/2013] [Accepted: 02/08/2013] [Indexed: 10/27/2022]
Abstract
For a better understanding of the metal binding pattern of N(6)-substituted adenines, six novel ternary Cu(II) complexes have been structurally characterized by single crystal X-ray diffraction: [Cu(NBzIDA)(HCy5ade)(H2O)]·H2O (1), [Cu(NBzIDA)(HCy6ade)(H2O)]·H2O (2), [Cu(FurIDA)(HCy6ade)(H2O)]·H2O (3), [Cu(MEBIDA)(HBAP)(H2O)]·H2O (4), [Cu(FurIDA)(HBAP)]n (5) and {[Cu(NBzIDA)(HdimAP)]·H2O}n (6). In these compounds NBzIDA, FurIDA and MEBIDA are N-substituted iminodiacetates with a non-coordinating aryl-methyl pendant arm (benzyl in NBzIDA, p-tolyl in MEBIDA and furfuryl in FurIDA) whereas HBAP, HCy5ade, HCy6ade and HdimAP are N(6)-substituted adenine derivatives with a N-benzyl, N-cyclopentyl, N-cyclohexyl or two N-methyl groups, respectively. Regardless of the molecular (1-4) or polymeric (5-6) nature of the studied compounds, the Cu(II) centre exhibits a type 4+1 coordination where the tridentate IDA-like chelators adopt a mer-conformation. In 1-5 the N(6)-R-adenines use their most stable tautomer H(N9)adenine-like, and molecular recognition consists of the cooperation of the CuN3(purine) bond and the intra-molecular interligand N9H···O(coordinated carboxy) interaction. In contrast, N(6),N(6)-dimethyl-adenine shows the rare tautomer H(N3)dimAP in 6, so that the molecular recognition with the Cu(NBzIDA) chelate consist of the CuN9 bond and the N3H···O intra-molecular interligand interaction. Contrastingly to the cytokinin activity found in the free ligands HBAP (natural cytokinin), HCy5ade and HCy6ade, the corresponding Cu(II) ternary complexes did not show any activity.
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Affiliation(s)
- Alicia Domínguez-Martín
- Department of Inorganic Chemistry, Faculty of Pharmacy, Campus Cartuja, University of Granada, E-18071 Granada, Spain.
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Domínguez-Martín A, Niclós-Gutiérrez J. Special Issue from the 11th European Biological Inorganic Chemistry Conference (EUROBIC11). Preface. J Inorg Biochem 2013; 127:127. [PMID: 23993869 DOI: 10.1016/j.jinorgbio.2013.08.004] [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: 10/26/2022]
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Domínguez-Martín A, Johannsen S, Sigel A, Operschall BP, Song B, Sigel H, Okruszek A, González-Pérez JM, Niclós-Gutiérrez J, Sigel RKO. Intrinsic acid-base properties of a hexa-2'-deoxynucleoside pentaphosphate, d(ApGpGpCpCpT): neighboring effects and isomeric equilibria. Chemistry 2013; 19:8163-81. [PMID: 23595830 DOI: 10.1002/chem.201203330] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2012] [Revised: 12/09/2012] [Indexed: 02/02/2023]
Abstract
The intrinsic acid-base properties of the hexa-2'-deoxynucleoside pentaphosphate, d(ApGpGpCpCpT) [=(A1∙G2∙G3∙C4∙C5∙T6)=(HNPP)⁵⁻] have been determined by ¹H NMR shift experiments. The pKa values of the individual sites of the adenosine (A), guanosine (G), cytidine (C), and thymidine (T) residues were measured in water under single-strand conditions (i.e., 10% D₂O, 47 °C, I=0.1 M, NaClO₄). These results quantify the release of H⁺ from the two (N7)H⁺ (G∙G), the two (N3)H⁺ (C∙C), and the (N1)H⁺ (A) units, as well as from the two (N1)H (G∙G) and the (N3)H (T) sites. Based on measurements with 2'-deoxynucleosides at 25 °C and 47 °C, they were transferred to pKa values valid in water at 25 °C and I=0.1 M. Intramolecular stacks between the nucleobases A1 and G2 as well as most likely also between G2 and G3 are formed. For HNPP three pKa clusters occur, that is those encompassing the pKa values of 2.44, 2.97, and 3.71 of G2(N7)H⁺, G3(N7)H⁺, and A1(N1)H⁺, respectively, with overlapping buffer regions. The tautomer populations were estimated, giving for the release of a single proton from five-fold protonated H₅(HNPP)(±) , the tautomers (G2)N7, (G3)N7, and (A1)N1 with formation degrees of about 74, 22, and 4%, respectively. Tautomer distributions reveal pathways for proton-donating as well as for proton-accepting reactions both being expected to be fast and to occur practically at no "cost". The eight pKa values for H₅(HNPP)(±) are compared with data for nucleosides and nucleotides, revealing that the nucleoside residues are in part affected very differently by their neighbors. In addition, the intrinsic acidity constants for the RNA derivative r(A1∙G2∙G3∙C4∙C5∙U6), where U=uridine, were calculated. Finally, the effect of metal ions on the pKa values of nucleobase sites is briefly discussed because in this way deprotonation reactions can easily be shifted to the physiological pH range.
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Affiliation(s)
- Alicia Domínguez-Martín
- Institute of Inorganic Chemistry, University of Zürich, Winterthurerstrasse 190, 8057 Zürich, Switzerland
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Carballo R, Castiñeiras A, Domínguez-Martín A, García-Santos I, Niclós-Gutiérrez J. Solid state structures of cadmium complexes with relevance for biological systems. Met Ions Life Sci 2013; 11:145-89. [PMID: 23430774 DOI: 10.1007/978-94-007-5179-8_7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
This chapter provides a review of the literature on structural information from crystal structures determined by X-ray diffractometry of cadmium(II) complexes containing ligands of potential biological interest. These ligands fall into three broad classes, (i) those containing N-donors such as purine or pyrimidine bases and derivatives of adenine, guanine or cytosine, (ii) those containing carboxylate groups such as α-amino acids, in particular the twenty essential ones, the water soluble vitamins (B-complex) or the polycarboxylates of EDTA type ligands, and (iii) S-donors such as thiols/thiolates or dithiocarbamates. A crystal and molecular structural analysis has been carried out for some representative complexes of these ligands, specifically addressing the coordination mode of ligands, the coordination environment of cadmium and, in some significant cases, the intermolecular interactions.
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Affiliation(s)
- Rosa Carballo
- Departamento de Química Inorgánica, Facultad de Química, Universidad de Vigo, Vigo, Spain
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Domínguez-Martín A, Choquesillo-Lazarte D, Dobado JA, Martínez-García H, Lezama L, González-Pérez JM, Castiñeiras A, Niclós-Gutiérrez J. Structural consequences of the N7 and C8 translocation on the metal binding behavior of adenine. Inorg Chem 2013; 52:1916-25. [PMID: 23356582 DOI: 10.1021/ic302147u] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
7-Deaza-8-aza-adenine, namely 4-aminopyrazolo[3,4-d]pyrimidine (H4app), is a bioisoster of adenine (Hade) resulting from the translocation of N7 and C8 atoms on the purine moiety. With the aim of studying the influence of this translocation on the metal binding abilities of H4app, we have prepared and structurally characterized two ternary copper(II) complexes having H4app and one N-benzyl-iminodiacetate chelator (MEBIDA or FBIDA, with a methyl or fluoro group in para- of the benzyl aromatic ring): [Cu(2)(MEBIDA)(2)(μ(2)-N1,N8-H4app)(H(2)O)(2)]·4H(2)O (1) and [Cu(4)(FBIDA)(4)(μ(2)-N8,N9-H4app)(2)(H(2)O)]·3.5H(2)O (2). Furthermore, thermal, spectral, and magnetic properties have been also investigated. In 1, H(N9)4app is disordered over two equally pondered positions and the μ(2)-N1,N8 coordination mode is assisted by N6-H···O and N9-H···O intramolecular interactions, respectively. The acyclic nonlinear molecular topology of 2 is strongly influenced by two intramolecular H-bonding interactions (O-H···O-carboxylate) involving the apical aqua ligand of a terminal Cu(II) atom. Thus, both compounds have in common the Cu-N8 bond. In order to better understand our limited structural information, DFT calculations for the individual tautomers of H4app as well as mononuclear Cu(II) model systems have been carried out. According to previous results, we conclude that H(N9)4app is the most stable tautomer followed by H(N8)4app. When N9 and N8 are metalated, then the tautomer H(N1)4app can come into play as observed in compound 2. Likewise, the findings concerning compound 1 suggest that the formation of a Cu-N1 bond in H4app results was favored compared to neutral adenine, for which only one case has been reported with such coordination despite the large variety of related Cu(II)-Hade described in the literature.
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Affiliation(s)
- Alicia Domínguez-Martín
- Department of Inorganic Chemistry, Faculty of Pharmacy, University of Granada, E-18071 Granada, Spain.
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Balboa S, Carballo R, Castiñeiras A, González-Pérez JM, Niclós-Gutiérrez J. Structural features of palladium(II) complexes with α-hydroxycarboxylate and aromatic α,α′-diimine ligands. Polyhedron 2013. [DOI: 10.1016/j.poly.2012.11.048] [Citation(s) in RCA: 6] [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: 11/17/2022]
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El Bakkali H, Choquesillo-Lazarte D, Domínguez-Martín A, Brandi-Blanco MDP, Castiñeiras A, Niclós-Gutiérrez J. Isotype 1D polymers of cobalt(II) or zinc(II) constructed with square-planar tetraaqua-metal(2+) units and the bis-zwitterionic form of the μ2-O,O′-trans-1,4-dihydrogen-cyclohexanediaminotetraacetate(2−) ligand. Polyhedron 2012. [DOI: 10.1016/j.poly.2011.09.037] [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: 11/24/2022]
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Patel DK, Domínguez-Martín A, Brandi-Blanco MDP, Choquesillo-Lazarte D, Nurchi VM, Niclós-Gutiérrez J. Metal ion binding modes of hypoxanthine and xanthine versus the versatile behaviour of adenine. Coord Chem Rev 2012. [DOI: 10.1016/j.ccr.2011.05.014] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Patel DK, Choquesillo-Lazarte D, Domínguez-Martín A, Brandi-Blanco MP, González-Pérez JM, Castiñeiras A, Niclós-Gutiérrez J. Chelating Ligand Conformation Driving the Hypoxanthine Metal Binding Patterns. Inorg Chem 2011; 50:10549-51. [DOI: 10.1021/ic201918y] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- Dheerendra K. Patel
- Department of Inorganic Chemistry, Faculty of Pharmacy, University of Granada, 18071 Granada, Spain
| | - Duane Choquesillo-Lazarte
- Laboratorio de Estudios Cristalográgficos, IACT, CSIC-Universidad de Granada, Avenida de las Palmeras 4, 18100 Armilla, Granada, Spain
| | - Alicia Domínguez-Martín
- Department of Inorganic Chemistry, Faculty of Pharmacy, University of Granada, 18071 Granada, Spain
| | - M. Pilar Brandi-Blanco
- Department of Inorganic Chemistry, Faculty of Pharmacy, University of Granada, 18071 Granada, Spain
| | | | - Alfonso Castiñeiras
- Department of Inorganic Chemistry, Faculty of Pharmacy, University of Santiago de Compostela, 15782 Santiago de Compostela, Spain
| | - Juan Niclós-Gutiérrez
- Department of Inorganic Chemistry, Faculty of Pharmacy, University of Granada, 18071 Granada, Spain
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Domínguez-Martín A, Choquesillo-Lazarte D, González-Pérez JM, Castiñeiras A, Niclós-Gutiérrez J. Molecular recognition patterns of 2-aminopurine versus adenine: a view through ternary copper(II) complexes. J Inorg Biochem 2011; 105:1073-80. [PMID: 21726770 DOI: 10.1016/j.jinorgbio.2011.05.009] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2011] [Revised: 05/11/2011] [Accepted: 05/18/2011] [Indexed: 11/19/2022]
Abstract
In contrast to the comprehensive structural information about metal complexes with adenine, the corresponding to its isomer 2-aminopurine (H2AP) is extremely poor. With the aim to rationalize the metal binding pattern of H2AP, we report the molecular and/or crystal structure of four novel compounds with various iminodiacetate-like (IDA-like) copper(II) chelates: [Cu(IDA)(H2AP)(H2O)]·H2O (1), [Cu(MIDA)(H2AP)(H2O)]·3H2O (2), {[Cu(NBzIDA)(H2AP)]·1.5H2O}n (3) and [Cu(MEBIDA)(H2AP)(H2O)]·3.5 H2O (4), where IDA, MIDA, NBzIDA and MEBIDA are R=H, CH3, benzyl- and p-tolyl- in R-N-(CH2-COO-)2 ligands, respectively. Synthesis strategies include direct reactions of copper(II) chelates with H2AP (alone, for 1 and 3) and/or with the base pairs H2AP:thymine (1-4) or H2AP:cytosine (3). Moreover, these compounds have been also investigated by spectral and thermal methods. Regardless of the N-derivative of the IDA chelator, molecular recognition between H2AP and the referred Cu(II)-chelates only displays the formation of the Cu-N7(purine-like) bond what is clearly in contrast to what was previously reported for adenine. The metal binding pattern of 2-aminopurine is discussed on the basis of the electronic effects and steric hindrance of the 2-amino exocyclic group.
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Affiliation(s)
- Alicia Domínguez-Martín
- Department of Inorganic Chemistry, Faculty of Pharmacy, Campus Cartuja, University of Granada, E-18071 Granada, Spain.
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Brandi-Blanco MDP, Choquesillo-Lazarte D, Domínguez-Martín A, González-Pérez JM, Castiñeiras A, Niclós-Gutiérrez J. Metal ion binding patterns of acyclovir: Molecular recognition between this antiviral agent and copper(II) chelates with iminodiacetate or glycylglycinate. J Inorg Biochem 2011; 105:616-23. [DOI: 10.1016/j.jinorgbio.2011.02.001] [Citation(s) in RCA: 22] [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] [Received: 12/01/2010] [Revised: 02/02/2011] [Accepted: 02/03/2011] [Indexed: 11/29/2022]
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Patel R, Shukla K, Singh A, Choudhary M, Patel D, Niclós-Gutiérrez J, Choquesillo-Lazarte D. Spectral, structural, and superoxide dismutase activity of some octahedral nickel(II) complexes with tri-tetradentate ligands. J COORD CHEM 2010. [DOI: 10.1080/00958972.2010.515985] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [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)
- R.N. Patel
- a Department of Chemistry , A.P.S. University , Rewa 486003, M.P., India
| | - K.K. Shukla
- a Department of Chemistry , A.P.S. University , Rewa 486003, M.P., India
| | - Anurag Singh
- a Department of Chemistry , A.P.S. University , Rewa 486003, M.P., India
| | - M. Choudhary
- a Department of Chemistry , A.P.S. University , Rewa 486003, M.P., India
| | - D.K. Patel
- b Departamento de Química Inorgánica , Facultad de Farmacia, Campus Cartuja, Universidad de Granada , E-18071 Granada, Spain
| | - J. Niclós-Gutiérrez
- b Departamento de Química Inorgánica , Facultad de Farmacia, Campus Cartuja, Universidad de Granada , E-18071 Granada, Spain
| | - D. Choquesillo-Lazarte
- c Lab. de Estudios Cristalográficos–IACT-CSIC , Edificio Inst. López-Neyra, P.T. Ciencias de la Salud , Avenida del Conocimiento s/n, E- 8100 Armilla, Granada, Spain
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Patel D, Choquesillo-Lazarte D, González-Pérez J, Domínguez-Martín A, Matilla-Hernandez A, Castiñeiras A, Niclós-Gutiérrez J. Nickel(II) derivatives of N-benzyliminodiacetate(2−) ligands, with and without imidazole: Synthesis, crystal structure and properties. Polyhedron 2010. [DOI: 10.1016/j.poly.2009.09.034] [Citation(s) in RCA: 7] [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: 11/26/2022]
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Choquesillo-Lazarte D, Domínguez-Martín A, Matilla-Hernández A, Sánchez de Medina-Revilla C, González-Pérez JM, Castiñeiras A, Niclós-Gutiérrez J. Restricting the versatile metal-binding behaviour of adenine by using deaza-purine ligands in mixed-ligand copper(II) complexes. Polyhedron 2010. [DOI: 10.1016/j.poly.2009.06.054] [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: 10/20/2022]
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Freisinger E, Griesser R, Lippert B, Moreno-Luque CF, Niclós-Gutiérrez J, Ochocki J, Operschall BP, Sigel H. Comparison of the surprising metal-ion-binding properties of 5- and 6-uracilmethylphosphonate (5Umpa2- and 6Umpa2-) in aqueous solution and crystal structures of the dimethyl and di(isopropyl) esters of H2(6Umpa). Chemistry 2009; 14:10036-46. [PMID: 18803205 DOI: 10.1002/chem.200800998] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
5- and 6-Uracilmethylphosphonate (5Umpa(2-) and 6Umpa(2-)) as acyclic nucleotide analogues are in the focus of anticancer and antiviral research. Connected metabolic reactions involve metal ions; therefore, we determined the stability constants of M(Umpa) complexes (M(2+)=Mg(2+), Ca(2+), Mn(2+), Co(2+), Cu(2+), Zn(2+), or Cd(2+)). However, the coordination chemistry of these Umpa species is also of interest in its own right, for example, the phosphonate-coordinated M(2+) interacts with (C4)O to form seven-membered chelates with 5Umpa(2-), thus leading to intramolecular equilibria between open (op) and closed (cl) isomers. No such interaction occurs with 6Umpa(2-). In both M(Umpa) series deprotonation of the uracil residue leads to the formation of M(Umpa-H)(-) complexes at higher pH values. Their stability was evaluated by taking into account the fact that the uracilate residue can bind metal ions to give M(2)(Umpa-H)(+) species. This has led to two further important insights: 1) In M(6Umpa-H)-cl the H(+) is released from (N1)H, giving rise to six-membered chelates (degrees of formation of ca. 90 to 99.9 % with Mn(2+), Co(2+), Cu(2+), Zn(2+), or Cd(2+)). 2) In M(5Umpa-H)$-cl the (N3)H is deprotonated, leading to a higher stability of the seven-membered chelates involving (C4)O (even Mg(2+) and Ca(2+) chelates are formed up to approximately 50 %). In both instances the M(Umpa-H)-op species led to the formation of M(2)(Umpa-H)(+) complexes that have one M(2+) at the phosphonate and one at the (N3)(-) (plus carbonyl) site; this proves that nucleotides can bind metal ions independently at the phosphate and the nucleobase residues. X-ray structural analyses of 6Umpa derivatives show that in diesters the phosphonate group is turned away from the uracil residue, whereas in H(2)(6Umpa) the orientation is such that upon deprotonation in aqueous solution a strong hydrogen bond is formed between (N1)H and PO(3) (2-); replacement of the hydro gen with M(2+) gives the M(6Umpa-H)-cl chelates mentioned.
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Affiliation(s)
- Eva Freisinger
- Institute of Inorganic Chemistry, University of Zürich, 8057 Zürich, Switzerland
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Patel RN, Shukla KK, Singh A, Choudhary M, Patel DK, Niclós-Gutiérrez J, Choquesillo-Lazarte D. Spectroscopic, structural and magnetic studies of nickel(II) complexes with tetra- and pentadentate ligands. TRANSIT METAL CHEM 2009. [DOI: 10.1007/s11243-008-9184-6] [Citation(s) in RCA: 7] [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: 11/30/2022]
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Sánchez de Medina-Revilla C, Domínguez-Martín A, Choquesillo-Lazarte D, González-Pérez J, Valenzuela-Calahorro C, Castiñeiras A, García-Santos I, Niclós-Gutiérrez J. Synthesis, crystal structure and properties of three different derivatives of bis[di(2-pyridyl)methanediol]copper(II), [Cu(bpmd)2]2+. J COORD CHEM 2008. [DOI: 10.1080/00958970802474847] [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: 10/21/2022]
Affiliation(s)
| | - A. Domínguez-Martín
- a Facultad de Farmacia, Departamento de Química Inorgánica , Universidad de Granada , E-18005 Granada, Spain
| | - D. Choquesillo-Lazarte
- b Laboratorio de Estudios Cristalográficos, IACT-CSIC , E-18100 Armilla (Granada), Spain
| | - J. González-Pérez
- a Facultad de Farmacia, Departamento de Química Inorgánica , Universidad de Granada , E-18005 Granada, Spain
| | - C. Valenzuela-Calahorro
- a Facultad de Farmacia, Departamento de Química Inorgánica , Universidad de Granada , E-18005 Granada, Spain
| | - A. Castiñeiras
- c Facultad de Farmacia, Departamento de Química Inorgánica , Universidad de Santiago de Compostela , E-15782 Santiago de Compostela, Spain
| | - I. García-Santos
- c Facultad de Farmacia, Departamento de Química Inorgánica , Universidad de Santiago de Compostela , E-15782 Santiago de Compostela, Spain
| | - J. Niclós-Gutiérrez
- a Facultad de Farmacia, Departamento de Química Inorgánica , Universidad de Granada , E-18005 Granada, Spain
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Balboa S, Carballo R, Castiñeiras A, González-Pérez JM, Niclós-Gutiérrez J. Mononuclear, dinuclear and hydroxo-bridged tetranuclear complexes from reactions of CuII ions, mandelic acid and diimine ligands. Polyhedron 2008. [DOI: 10.1016/j.poly.2008.06.028] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.0] [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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Choquesillo-Lazarte D, Brandi-Blanco MDP, García-Santos I, González-Pérez JM, Castiñeiras A, Niclós-Gutiérrez J. Interligand interactions involved in the molecular recognition between copper(II) complexes and adenine or related purines. Coord Chem Rev 2008. [DOI: 10.1016/j.ccr.2007.09.018] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Castiñeiras A, Balboa S, Carballo R, González-Pérez JM, Niclós-Gutiérrez J. Structural Evidences for the Oxidation of α-Hydroxycarboxilic Acids to Oxalate Assisted by Copper(II) Ions. Z Anorg Allg Chem 2007. [DOI: 10.1002/zaac.200600362] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Alarcón-Payer C, Bugella-Altamirano E, Choquesillo-Lazarte D, Castiñeiras A, González-Pérez JM, Niclós-Gutiérrez J. Dinuclear EGTA-copper(II) chelates with imidazole as auxiliary ligand. INORG CHEM COMMUN 2006. [DOI: 10.1016/j.inoche.2006.05.023] [Citation(s) in RCA: 4] [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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Castiñeiras A, Choquesillo-Lazarte D, González-Pérez JM, Carballo R, Niclós-Gutiérrez J. Metal Chelates of N-(2-pyridylmethyl)iminodiacetate(2-) Ion (pmda). Part II. Ternary pmda Chelates with M = Co, Cu or Zn and Creatinine as Auxiliary Ligand. Z Anorg Allg Chem 2006. [DOI: 10.1002/zaac.200500459] [Citation(s) in RCA: 5] [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: 11/10/2022]
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González-Pérez JM, Alarcón-Payer C, Castiñeiras A, Pivetta T, Lezama L, Choquesillo-Lazarte D, Crisponi G, Niclós-Gutiérrez J. A Windmill-Shaped Hexacopper(II) Molecule Built Up by Template Core-Controlled Expansion of Diaquatetrakis(μ2-adeninato-N3,N9)dicopper(II) with Aqua(oxydiacetato)copper(II). Inorg Chem 2005; 45:877-82. [PMID: 16411726 DOI: 10.1021/ic051965s] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.6] [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: 11/29/2022]
Abstract
The windmill-shaped hexanuclear copper(II) cluster {(H(2)O)(2)Cu(2)(mu(3)-(Ade)(4)[Cu(oda)(H(2)O)](4)}.6H(2)O (1-o) has been synthesized in aqueous medium by in situ core-controlled expansion of the neutral building block Cu(2)(mu(2)-N3,N9-Ade)(4)(H(2)O)(2) (2) with Cu(oda)(H(2)O) (3-o) (Ade = adeninato(1-) and oda = oxydiacetato(2-) ligands). Crystal data for 2-b (2.5H(2)O): triclinic, space group P(-)1; a = 9.374(1), b = 9.440(1), c = 10.326(1) A; alpha = 78.72(1), beta = 76.77(1), gamma = 63.51(1) degrees ; final R(1) = 0.059; T = 100(2) K. Crystal data for 1-o: monoclinic, space group P2(1)/n; a = 15.203(2), b = 10.245(1), c = 19.094(2) A; beta = 101.61(1) degrees ; final R(1) = 0.049; T = 293(2) K. The X-shaped hexanuclear molecule consists of a central core (2) and four terminal arms (3-o) linked together by bridging mu(3)-N3,N7,N9-Ade ligands. There are three crystallographic independent metal atoms (two terminals, one central). All Cu(II) atoms exhibit a 4 + 1 coordination, of which one is an aqua apical ligand. The basal coordination sets complete the CuN(4) + O or CuO(3)N + O chromophores for the central or terminal metal atoms, respectively. Thermal stability and spectral and magnetic properties were also studied. Analogous compounds to 1-o with tridentate or tripodal tetradentate ligands L(2-), instead of oda, have also been synthesized.
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Patel RN, Singh N, Shukla KK, Niclós-Gutiérrez J, Castineiras A, Vaidyanathan VG, Nair BU. Characterization and biological activities of two copper(II) complexes with diethylenetriamine and 2,2'-bipyridine or 1,10-phenanthroline as ligands. Spectrochim Acta A Mol Biomol Spectrosc 2005; 62:261-8. [PMID: 16257723 DOI: 10.1016/j.saa.2004.12.034] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/16/2004] [Revised: 12/16/2004] [Accepted: 12/17/2004] [Indexed: 05/05/2023]
Abstract
Two new mixed ligand copper(II) complexes with diethylenetriamine, 2,2'-bipyridine and 1,10-phenanthroline have been synthesized. The crystal and molecular structures of [Cu(dien)(phen)](ClO(4))(2) and [Cu(dien)(bipy)](BF(4))(2) (dien=diethylenetriamine, phen=1,10-phenanthroline, bipy=2,2'-bipyridine) were determined by X-ray crystallography from single crystal data. These two complexes have similar structures. The EPR spectral data also suggest that these complexes have distorted square pyramidal geometry about copper(II). Anti-microbial and superoxide dismutase activities of these complexes have also been measured. They show the higher SOD activity than the corresponding simple Cu(II)-dien/Cu(II)-PMDT (PMDT=N,N,N',N',N''-pentamethyldiethylenetriamine) complexes because of a strong axial bond of one of the nitrogen atoms of the alpha-diimine. Both the complexes have been found to cleave plasmid DNA in the presence of co-reductants such as ascorbic acid and glutathione.
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Affiliation(s)
- R N Patel
- Department of Chemistry, A.P.S. University, Rewa, M.P. 486003, India.
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Potgieter H, Purcell W, Visser HG, Niclós-Gutiérrez J. Identification of different Co(III) apda complexes: Crystallisation of [Co(H2O)6]·[Co(Hapda)2]2·H2O. Polyhedron 2005. [DOI: 10.1016/j.poly.2005.05.014] [Citation(s) in RCA: 2] [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: 11/26/2022]
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Brandi-Blanco MP, Choquesillo-Lazarte D, González-Pérez JM, Castiñeiras A, Niclós-Gutiérrez J. Mixed-ligand Complexes with 2,6-Pyridinedicarboxylato(2-) and 4,7-Diphenyl-1,10-Phenanthroline Ligands, [MII(pdc)(DPphen)(H2O)]·H2O (M = Co or Cu). Synthesis, Crystal Structures and Properties. Z Anorg Allg Chem 2005. [DOI: 10.1002/zaac.200570018] [Citation(s) in RCA: 6] [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: 11/10/2022]
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Rojas-González PX, Brandi-Blanco MP, Castiñeiras A, Choquesillo-Lazarte D, González-Pérez JM, Niclós-Gutiérrez J. Mixed-ligand Copper(II) Complexes with N-isopropyl-iminodiacetato(2-) and C-phenyl-imidazole Ligands. Crystal Structures of H2iPIDA, [Cu(iPIDA)(H2φim)(H2O)]·3H2O and [Cu(iPIDA)(H5φim)]n. Z Anorg Allg Chem 2005. [DOI: 10.1002/zaac.200570033] [Citation(s) in RCA: 5] [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: 11/09/2022]
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Tribet M, Covelo B, Sicilia-Zafra AG, Navarrete-Casas R, Choquesillo-Lazarte D, González-Pérez JM, Castiñeiras A, Niclós-Gutiérrez J. Ternary copper(II) complexes with N-carboxymethyl-l-prolinato(2−) ion and imidazole or creatinine: A comparative study of the interligand interactions influencing the molecular recognition and stability. J Inorg Biochem 2005; 99:1424-32. [PMID: 15878623 DOI: 10.1016/j.jinorgbio.2005.03.012] [Citation(s) in RCA: 6] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2005] [Revised: 03/14/2005] [Accepted: 03/25/2005] [Indexed: 10/25/2022]
Abstract
The compounds {[Cu(CMP)(Him)].H(2)O}(n) (I) and [Cu(CMP)(crea)H(2)O].3H(2)O (II) were synthesized and characterized by X-ray diffraction, thermal, spectral and magnetic methods (CMP=N-carboxymethyl-;l-prolinato(2-) ion, Him=imidazole and crea=creatinine). Appropriate structural comparison with other compounds such as {[Cu(CMP)(H(2)O)].H(2)O}(n), [Cu(crea)(2)Cl(2)] and [Cu(dipeptide)(crea)(H(2)O)(x)].nH(2)O (x=0 or 1) have been made in order to prove that crea can act as an imidazole-like ligand (because it is able to promote the same fac- to mer-CMP tridentate conformational change in copper(II) complexes) as well as to discuss the interligand interactions which control the 'Cu(CMP) complex-crea, molecular recognition processes. In contrast to that found in related ternary complexes, we have concluded that direct CMP-crea interligand interactions are missing in the Cu-CMP-crea complex due to the inappropriate correspondence between the donor and/or acceptor H-bonding properties of these ligands. CMP can only act as H-acceptor by its two terminal carboxylate group, and crea can display H-donor and H-acceptor roles by its exocyclic -NH(2) and O moieties, respectively. That promotes the reinforcement of the Cu-N(crea) bond by a bridge -N-H(crea)...O(aqua) (2.867(3)A, 176.4 degrees).
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Affiliation(s)
- M Tribet
- Department of Inorganic Chemistry, Faculty of Pharmacy, University of Granada, E-18071Granada, Spain
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Jiang YF, Xi CJ, Liu YZ, Niclós-Gutiérrez J, Choquesillo-Lazarte D. Intramolecular “CH···π(Metal Chelate Ring) Interactions” as Structural Evidence for Metalloaromaticity in Bis(pyridine-2,6-diimine)RuIIComplexes. Eur J Inorg Chem 2005. [DOI: 10.1002/ejic.200400864] [Citation(s) in RCA: 61] [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: 11/08/2022]
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Patel R, Singh N, Shukla K, Chauhan U, Niclós-Gutiérrez J, Castiñeiras A. Magnetic, spectroscopic, structural and biological properties of mixed-ligand complexes of copper(II) with N,N,N′,N″,N″-pentamethyldiethylenetriamine and polypyridine ligands. Inorganica Chim Acta 2004. [DOI: 10.1016/j.ica.2004.02.033] [Citation(s) in RCA: 71] [Impact Index Per Article: 3.6] [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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Patel RN, Singh N, Shukla KK, Chauhan UK, Chakraborty S, Niclós-Gutiérrez J, Castiñeiras A. X-ray, spectral and biological (antimicrobial and superoxide dismutase) studies of oxalato bridged CuII–NiII and CuII–ZnII complexes with pentamethyldiethylenetriamine as capping ligand. J Inorg Biochem 2004; 98:231-7. [PMID: 14729303 DOI: 10.1016/j.jinorgbio.2003.10.003] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.6] [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: 11/20/2022]
Abstract
X-band electron spin resonance (ESR) and electronic spectra of oxalatobridged heterodinuclear Cu-Ni and Cu-Zn complexes, viz., [(PMDT)Cu-Ox-Ni(PMDT)](BPh(4))(2).2CH(3)CN and [(PMDT)Cu-Ox-Zn(PMDT)](BPh(4))(2).2CH(3)CN, where PMDT=pentamethyldiethylenetriamine, Ox=oxalate ion have been described. Complex [(PMDT)Cu-Ox-Ni(PMDT)](BPh(4))(2).2CH(3)CN has been structurally characterized. This complex crystallizes in the monoclinic space group, C(2) (No. 5) with the unit parameters a=20.445(4) A, b=14.884(3) A, c=23.174(5) A, alpha=90 degrees, beta=102.693(4) degrees, gamma=90 degrees, V=6880(2) A(3) and Z=4. The structure refined to R=0.0354 and R(w)=0.0853 for 21,109 reflections with I>2 sigma(I) using 765 parameters, shows the presence of a MN(3)O(2) chromophore in a distorted trigonal-bipyramidal (TBP) heterometallic complex with oxalate dianion. Taking with an equatorial Cu-O=2.137(8) A and an axial Cu-O=1.961(6) A coordination site at Cu(II) ion and equatorial Ni-O=2.178(7) A and axial Ni-O=1.994 (9) A coordination site at Ni(II) ion. The Cu-Ni distance is 5.3532(9) A and Cu-C(2)O(4)-Ni unit is planar. The [(PMDT)Cu-Ox-Ni(PMDT)](2+) shows the ESR spectrum of the antiferromagnetic spin exchange with each dinuclear delocalization of the unpaired electron over the unit and spin-doublet ground state which demonstrates the Cu-Ox-Ni core. Antimicrobial and superoxide dismutase (SOD) activities of these complexes have also been measured.
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Affiliation(s)
- R N Patel
- Department of Chemistry, A.P.S. University, Rewa 486 003, Madhya Pradesh, India.
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Sánchez-Moreno MJ, Fernández-Botello A, Gómez-Coca RB, Griesser R, Ochocki J, Kotynski A, Niclós-Gutiérrez J, Moreno V, Sigel H. Metal Ion-Binding Properties of (1H-Benzimidazol-2-yl-methyl)phosphonate (Bimp2-) in Aqueous Solution.⊥Isomeric Equilibria, Extent of Chelation, and a New Quantification Method for the Chelate Effect. Inorg Chem 2004; 43:1311-22. [PMID: 14966966 DOI: 10.1021/ic030175k] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The acidity constants of the 2-fold protonated (1H-benzimidazol-2-yl-methyl)phosphonate, H2(Bimp)(+/-), are given, and the stability constants of the M(H;Bimp)+ and M(Bimp) complexes with the metal ions M2+ = Mg2+, Ca2+, Ba2+, Mn2+, Co2+, Cu2+, Zn2+, or Cd2+ have been determined by potentiometric pH titrations in aqueous solution at I = 0.1 M (NaNO3) and 25 degrees C. Application of previously determined straight-line plots of log KM(M(Bi-R)) versus pKH(H(Bi-R)) for benzimidazole-type ligands, Bi-R, where R represents a residue which does not affect metal ion binding, proves that the primary binding site in the M(H;Bimp)+ complexes is (mostly) N3 and that the proton is located at the phosphonate group; outersphere interactions seem to be important, and the degree of chelate formation is above 60% for all metal ion complexes studied, except for Zn(H;Bimp)+. A similar evaluation based on log KM(M(R-PO3)) versus pKH(H(R-PO3)) straight-line plots for simple phosph(on)ate ligands, R-, where R represents a residue which cannot participate in the coordination process, reveals that the primary binding site in the M(Bimp) complexes is (mostly) the phosphonate group with all metal ions studied. In this case, the formation degree of the chelates varies more widely in dependence on the kind of metal ion involved, i.e., from 17 +/- 11% to nearly 100% for Ba(Bimp) and Cu(Bimp), respectively. For all the M(H;Bimp)+ and M(Bimp) systems, the intramolecular equilibria between the isomeric complexes are evaluated in a quantitative manner. The fact that for Bimp2- the metal ion affinity of the two binding sites, N3 and PO3(2-), can be calculated independently, i.e., the corresponding micro stability constants become known, allows us to present for the first time a method for the quantification of the chelate effect solely based on comparisons of stability constants which carry the same dimensions. This effect is often ill defined in textbooks because equilibrium constants of different dimensions are compared, which is avoided in the present case. For the M(Bimp) complexes, it is shown that the chelate effect is close to zero for Ba(Bimp) whereas for Cu(Bimp) it amounts to about four log units. This method is also applicable to other chelating systems. Finally, considering that benzimidazole as well as phosphonate derivatives are employed as therapeutic agents, the potential biological properties of Bimp, especially regarding nucleic acid polymerases, are briefly discussed.
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Affiliation(s)
- María José Sánchez-Moreno
- Inorganic Chemistry, Department of Chemistry, University of Basel, Spitalstrasse 51, CH-4056 Basel, Switzerland
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Mukhopadhyay U, Choquesillo-Lazarte D, Niclós-Gutiérrez J, Bernal I. A critical look on the nature of the intra-molecular interligand π,π-stacking interaction in mixed-ligand copper(ii) complexes of aromatic side-chain amino acidates and α,α′-diimines. CrystEngComm 2004. [DOI: 10.1039/b417707j] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.2] [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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Morel A, Choquesillo-Lazarte D, Alarcón-Payer C, González-Pérez J, Castiñeiras A, Niclós-Gutiérrez J. An aqua-adenine H-bonding interaction controlling the formation of the rare Zn(II)–N9(adenine) bond in crystal structure of diaqua(adenine)(iminodiacetato)zinc(II). INORG CHEM COMMUN 2003. [DOI: 10.1016/j.inoche.2003.06.001] [Citation(s) in RCA: 30] [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: 11/16/2022]
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