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Ojha R, Boas JF, Best SP, Canty AJ, Junk PC, Deacon GB, Bond AM. Electron Delocalization in Spectroelectrochemically and Computationally Characterized [Pt{( p-BrC 6F 4)NCH═C(Cl)NEt 2}Cl(py)] + Formed by Electrochemical Oxidation of [Pt II{( p-BrC 6F 4)NCH═C(Cl)NEt 2}Cl(py)]. Inorg Chem 2021; 60:18899-18911. [PMID: 34851646 DOI: 10.1021/acs.inorgchem.1c02682] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
[Pt{(p-BrC6F4)NCH═C(Cl)NEt2}Cl(py)] (1Cl) is the product of the hydrogen peroxide oxidation of the PtII anticancer agent [Pt{(p-BrC6F4)NCH2CH2NEt2}Cl(py)] (1). Insights into electron delocalization and bonding in [Pt{(p-BrC6F4)NCH═C(Cl)NEt2}Cl(py)]+ (1Cl+) obtained by electrochemical oxidation of 1Cl have been gained by spectroscopic and computational studies. The 1Cl/1Cl+ process is chemically and electrochemically reversible on the short time scale of voltammetry in dichloromethane (0.10 M [Bu4N][PF6]). Substantial stability is retained on longer time scales enabling a high yield of 1Cl+ to be generated by bulk electrolysis. In situ IR and visible spectroelectrochemical studies on the oxidation of 1Cl to 1Cl+ and the reduction of 1Cl+ back to 1Cl confirm the long-term chemical reversibility. DFT calculations indicate only a minor contribution to the electron density (13%) resides on the Pt metal center in 1Cl+, indicating that the 1Cl/1Cl+ oxidation process is extensively ligand-based. Published X-ray crystallographic data show that 1Cl is present in only one structural form, while NMR data on the dissolved crystals revealed the presence of two closely related structural forms in an almost equimolar ratio. Solution-phase EPR spectra of 1Cl+ are consistent with two closely related structural forms in a ratio of about 90:10. The average g value for the frozen solution spectra (2.0567 for the major species) is significantly greater than the 2.0023 expected for a free radical. Crystal field analysis of the EPR spectra leads to an estimate of the 5d(xz) character of around 10% in 1Cl+. Analysis of X-ray absorption fine structure derived from 1Cl+ also supports the presence of a delocalized singly occupied metal molecular orbital with a spin density of approximately 17% on Pt. Accordingly, the considerably larger electron density distribution on the ligand framework (diminished PtIII character) is proposed to contribute to the increased stability of 1Cl+ compared to that of 1+.
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Affiliation(s)
- Ruchika Ojha
- School of Chemistry, Monash University, Clayton, VIC 3800, Australia
| | - John F Boas
- School of Physics and Astronomy, Monash University, Clayton, VIC 3800, Australia
| | - Stephen P Best
- School of Chemistry, The University of Melbourne, Parkville, VIC 3010, Australia
| | - Allan J Canty
- School of Natural Sciences─Chemistry, University of Tasmania, Hobart, TAS 7001, Australia
| | - Peter C Junk
- College of Science & Engineering, James Cook University, Townsville, QLD 4811, Australia
| | - Glen B Deacon
- School of Chemistry, Monash University, Clayton, VIC 3800, Australia
| | - Alan M Bond
- School of Chemistry, Monash University, Clayton, VIC 3800, Australia
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Bis(4-nitrobenzenethiolato)tetranitrosyldiiron: synthesis, structure, and pharmacological activity of a new nitric oxide (NO) donor. Russ Chem Bull 2017. [DOI: 10.1007/s11172-017-1944-z] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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3
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Niazi M, Shahsavari HR, Haghighi MG, Halvagar MR, Hatami S, Notash B. Reactivity of a half-lantern Pt2(ii,ii) complex with triphenylphosphine: selectivity in a protonation reaction. RSC Adv 2016. [DOI: 10.1039/c6ra15604e] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Reaction of PPh3 with half-lantern complex [{Pt(ppy)(μ2-Spy)}2], 1, gave complex [Pt(ppy)(η1-S-Spy)(PPh3)], 2, as a result of platinum–nitrogen bonds dissociation. Complex 2 revealed anionic selectivity upon protonation reaction with acidic species.
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Affiliation(s)
- Maryam Niazi
- Department of Chemistry
- Institute for Advanced Studies in Basic Sciences (IASBS)
- Zanjan 45137-6731
- Iran
| | - Hamid R. Shahsavari
- Department of Chemistry
- Institute for Advanced Studies in Basic Sciences (IASBS)
- Zanjan 45137-6731
- Iran
| | | | | | - Samaneh Hatami
- Department of Chemistry
- Institute for Advanced Studies in Basic Sciences (IASBS)
- Zanjan 45137-6731
- Iran
| | - Behrouz Notash
- Department of Chemistry
- Shahid Beheshti University
- Tehran 19839-69411
- Iran
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4
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Aseman MD, Nabavizadeh SM, Shahsavari HR, Rashidi M. C–H reductive elimination during the reaction of cycloplatinated(ii) complexes with pyridine-2-thione: kinetic follow up. RSC Adv 2015. [DOI: 10.1039/c5ra01341k] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023] Open
Abstract
Reactions of the cycloplatinated(ii) complexes [PtR(ppy)(SMe2)], 1, where ppy = deprotonated 2-phenylpyridine and R = Me or p-MeC6H4, with pyridine-2-thione, C5H5SN, were studied by UV-vis and 1H NMR spectroscopies and on the basis of the data a mechanism is proposed.
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Affiliation(s)
| | | | - Hamid R. Shahsavari
- Department of Chemistry
- Institute for Advanced Studies in Basic Sciences
- Zanjan
- Iran
| | - Mehdi Rashidi
- Department of Chemistry
- College of Sciences
- Shiraz University
- Shiraz 71467-13565
- Iran
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5
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Spectroelectrochemical investigations of pyrimidine-2-thionato-bridged binuclear platinum(III) complexes. Polyhedron 2014. [DOI: 10.1016/j.poly.2014.02.046] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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6
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Dinuclear cyclometallated platinum(III) complexes. Relationship between molecular structure and crystal packing. Polyhedron 2014. [DOI: 10.1016/j.poly.2013.08.060] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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7
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Escribano E, Font-Bardia M, Calvet T, Lorenzo J, Gamez P, Moreno V. DNA binding studies of a series of cis-[Pt(Am)2X2] complexes (Am=inert amine, X=labile carboxylato ligand). Inorganica Chim Acta 2013. [DOI: 10.1016/j.ica.2012.07.018] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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8
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Aliende C, Pérez-Manrique M, Jalón FA, Manzano BR, Rodríguez AM, Cuevas JV, Espino G, Martínez MÁ, Massaguer A, González-Bártulos M, de Llorens R, Moreno V. Preparation of new half sandwich ruthenium arene complexes with aminophosphines as potential chemotherapeutics. J Inorg Biochem 2012; 117:171-88. [DOI: 10.1016/j.jinorgbio.2012.07.022] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2012] [Revised: 07/31/2012] [Accepted: 07/31/2012] [Indexed: 11/27/2022]
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9
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Kozub GI, Sanina NA, Kondrat’eva TA, Shilov GV, Korchagin DV, Ovanesyan NS, Aldoshin SM. Synthesis, structure, and NO-donor activity of bis(5-nitropyridine-2-thiolato)tetranitrosyliron. RUSS J COORD CHEM+ 2012. [DOI: 10.1134/s1070328412090059] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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10
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Abstract
Oxidation of the acetate-bridged half-lantern platinum(II) complex cis-[Pt(II)(NH(3))(2)(μ-OAc)(2)Pt(II)(NH(3))(2)](NO(3))(2), [1](NO(3))(2), with iodobenzene dichloride or bromine generates the halide-capped platinum(III) species cis-[XPt(III)(NH(3))(2)(μ-OAc)(2)Pt(III)(NH(3))(2)X](NO(3))(2), where X is Cl in [2](NO(3))(2) or Br in [3](NO(3))(2), respectively. These three complexes, characterized structurally by X-ray crystallography, feature short (≈2.6 Å) Pt-Pt separations, consistent with formation of a formal metal-metal bond upon oxidation. Elongated axial Pt-X distances occur, reflecting the strong trans influence of the metal-metal bond. The three structures are compared to those of other known dinuclear platinum complexes. A combination of (1)H, (13)C, (14)N, and (195)Pt NMR spectroscopy was used to characterize [1](2+)-[3](2+) in solution. All resonances shift downfield upon oxidation of [1](2+) to [2](2+) and [3](2+). For the platinum(III) complexes, the (14)N and (195)Pt resonances exhibit decreased line widths by comparison to those of [1](2+). Density functional theory calculations suggest that the decrease in the (14)N line width arises from a diminished electric field gradient at the (14)N nuclei in the higher valent compounds. The oxidation of [1](NO(3))(2) with the alternative oxidizing agent bis(trifluoroacetoxy)iodobenzene affords the novel tetranuclear complex cis-[(O(2)CCF(3))Pt(III)(NH(3))(2)(μ-OAc)(2)Pt(III)(NH(3))(μ-NH(2))](2)(NO(3))(4), [4](NO(3))(4), also characterized structurally by X-ray crystallography. In solution, this complex exists as a mixture of species, the identities of which are proposed.
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Affiliation(s)
- Justin J Wilson
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
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"Lantern-Shaped" Platinum(III) Complexes with Axially Bound 9-Ethylguanine or 1-Methylcytosine (L) of General Formula [Pt(2){HN=C(Bu)O}(4)L(2)](NO(3))(2). Bioinorg Chem Appl 2010:102863. [PMID: 20631827 PMCID: PMC2901605 DOI: 10.1155/2010/102863] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2010] [Accepted: 03/04/2010] [Indexed: 11/20/2022] Open
Abstract
The synthesis, NMR characterization, and X-ray crystallography of “lantern-shaped” platinum(III) complexes with four pivaloamidate bridging ligands and two 9-ethylguanines (9-EtG) or 1-methylcytosines (1-MeC) in axial positions are reported: cis-N2O2-[Pt2{HN=C(But)O}4(9-EtG)2](NO3)2 and cis-N2O2-[Pt2{HN=C(But)O}4(1-MeC)2](NO3)2. The last complex is, to the best of our knowledge, the first dinuclear compound of platinum(III) with axially bound 1-MeC.
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Yashchuk V, Kudrya V, Gryn D, Yatsenko L, Volchenskova I, Naumenko A, Yevtushenko N. The effect of noble metal atom incorporation on DNA spectral properties and its stability under irradiation. J Mol Liq 2010. [DOI: 10.1016/j.molliq.2010.02.004] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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13
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Cornacchia D, Pellicani RZ, Intini FP, Pacifico C, Natile G. Solution behavior of amidine complexes: an unexpected cis/trans isomerization and formation of di- and trinuclear platinum(III) and platinum(II) species. Inorg Chem 2010; 48:10800-10. [PMID: 19821556 DOI: 10.1021/ic9011372] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Platinum bis-amidine complexes (both the cis and trans isomers) are stable in acetone and chlorinated solvents but are unstable in protic solvents such as methanol or water. In the latter solvents an initial cis/trans isomerization leads to formation of an equilibrium mixture with a cis/trans ratio of about 1:4; subsequently a dinuclear platinum(III) complex (1) is formed under aerobic conditions while, under anaerobic conditions, a trinuclear platinum(II) compound (2) is obtained. We hypothesize that the process of isomerization and formation of polynuclear compounds (1 and 2) have a common precursor: a dinuclear platinum(II) species supported by two bridging amidinato ligands (3), formed in small yield, which can either dissociate back to monomers of cis/trans configuration or evolve in two different polynuclear species depending upon the aerobic/anaerobic conditions. In aerobic conditions, oxidation of platinum(II) to platinum(III) together with formation of two additional amidinato bridges across the two platinum centers takes place leading to compound 1. In contrast, in anaerobic conditions, oxidation of platinum is prevented and the dinuclear platinum(II) precursor remains in solution until it reacts with an extra molecule of the starting mononuclear complex which loses its two amidine ligands and cross-links the two bridging amidinato ligands of 3 to yield compound 2. This latter features two triply bridging amidinato ligands linking the three platinum units to form a pocket. Complexes 1 and 2 have been characterized by means of IR and NMR spectroscopy, mass spectrometry, elemental analysis, and X-ray crystallography.
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Affiliation(s)
- Daniele Cornacchia
- Università degli Studi di Bari, Dipartimento Farmaco-Chimico, via E. Orabona 4, 70125 Bari, Italy
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14
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Ruiz J, Rodríguez V, de Haro C, Espinosa A, Pérez J, Janiak C. New 7-azaindole palladium and platinum complexes: crystal structures and theoretical calculations. In vitro anticancer activity of the platinum compounds. Dalton Trans 2010; 39:3290-301. [DOI: 10.1039/b920854b] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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15
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Vetter C, Kaluđerović GN, Paschke R, Gómez-Ruiz S, Steinborn D. Synthesis, structures and in vitro cytotoxicity studies of platinum(IV) complexes with N,S and S,S heterocyclic ligands. Polyhedron 2009. [DOI: 10.1016/j.poly.2009.08.004] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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16
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Shestakov AF, Shul’ga YM, Emel’yanova NS, Sanina NA, Rudneva TN, Aldoshin SM, Ikorskii VN, Ovcharenko VI. Experimental and theoretical study of the arrangement, electronic structure and properties of neutral paramagnetic binuclear nitrosyl iron complexes with azaheterocyclic thyolyls having ‘S–C–N type’ coordination of bridging ligands. Inorganica Chim Acta 2009. [DOI: 10.1016/j.ica.2008.11.009] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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17
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Synthesis, characterization, and cytotoxicity of trimethylplatinum(IV) complexes with 2-thiocytosine and 1-methyl-2-thiocytosine ligands. Inorganica Chim Acta 2009. [DOI: 10.1016/j.ica.2008.03.085] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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18
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Ruiz J, Rodríguez V, Cutillas N, López G, Bautista D. Acetonimine and 4-imino-2-methylpentan-2-amino platinum(II) complexes: synthesis and in vitro antitumor activity. Inorg Chem 2008; 47:10025-36. [PMID: 18844342 DOI: 10.1021/ic8012359] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The reaction of [Pt(dmba)(PPh3)Cl] [where dmba = N,C-chelating 2-(dimethylaminomethyl)phenyl] with aqueous ammonia in acetone in the presence of AgClO4 gives the acetonimine complex [Pt(dmba)(PPh3)(NH=CMe2)]ClO4 (1). The reaction of [Pt(dmba)(DMSO)Cl] with aqueous ammonia in acetone in the presence of AgClO4 gives a mixture of [Pt(dmba)(NH=CMe2)2]ClO4 (2) and [Pt(dmba)(imam)]ClO4 (3a) (where imam = 4-imino-2-methylpentan-2-amino). [Pt(dmba)(DMSO)Cl] reacts with [Ag(NH=CMe2)2]ClO4 in a 1:1 molar ratio to give [Pt(dmba)(DMSO)(NH=CMe2)]ClO4 (4). The reaction of [Pt(dmba)(DMSO)Cl] with 20% aqueous ammonia in acetone at 70 degrees C in the presence of KOH gives [Pt(dmba)(CH2COMe)(NH=CMe2)] (5), whereas the reaction of [Pt(dmba)(DMSO)Cl] with 20% aqueous ammonia in acetone in the absence of KOH gives [Pt(dmba)(imam)]Cl (3b). The reaction of [NBu4]2[Pt2(C6F5)4(mu-Cl)2] with [Ag(NH=CMe2)2]ClO4 in a 1:2 molar ratio produces cis-[Pt(C6F5)2(NH=CMe2)2] (6). The crystal structures of 1 x 2 Me2CO, 2, 3a, 5, and 6 have been determined. Values of IC50 were calculated for the new platinum complexes against a panel of human tumor cell lines representative of ovarian (A2780 and A2780 cisR) and breast cancers (T47D). At 48 h incubation time complexes 1, 4, and 5 show very low resistance factors against an A2780 cell line which has acquired resistance to cisplatin. 1, 4, and 5 were more active than cisplatin in T47D (up to 30-fold in some cases). The DNA adduct formation of 1, 4, and 5 was followed by circular dichroism and electrophoretic mobility.
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Affiliation(s)
- José Ruiz
- Departamento de Quimica Inorganica and S.U.I.C., Edificio S.A.C.E., Universidad de Murcia, E-30071-Murcia, Spain.
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Ruiz J, Villa MD, Cutillas N, López G, Haro CD, Bautista D, Moreno V, Valencia L. Palladium(II) and Platinum(II) Organometallic Complexes with 4,7-dihydro-5-methyl-7-oxo[1,2,4]triazolo[1,5-a]pyrimidine. Antitumor Activity of the Platinum Compounds. Inorg Chem 2008; 47:4490-505. [DOI: 10.1021/ic701873b] [Citation(s) in RCA: 64] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- José Ruiz
- Departamento de Química Inorgánica,
Universidad de Murcia, E-30071- Murcia, Spain,
- S.U.I.C., Edificio S.A.C.E., Universidad de Murcia,
E-30071-Murcia, Spain,
- Department de Química Inorgànica,
Universitat de Barcelona, Martí i Franquès 1-11, E-08028
Barcelona, Spain, and
- Departamento de Química Inorgánica,
Universidad de Santiago de Compostela, Avda. de las Ciencias s/n,
E-15782 Santiago de Compostela, Spain
| | - María Dolores Villa
- Departamento de Química Inorgánica,
Universidad de Murcia, E-30071- Murcia, Spain,
- S.U.I.C., Edificio S.A.C.E., Universidad de Murcia,
E-30071-Murcia, Spain,
- Department de Química Inorgànica,
Universitat de Barcelona, Martí i Franquès 1-11, E-08028
Barcelona, Spain, and
- Departamento de Química Inorgánica,
Universidad de Santiago de Compostela, Avda. de las Ciencias s/n,
E-15782 Santiago de Compostela, Spain
| | - Natalia Cutillas
- Departamento de Química Inorgánica,
Universidad de Murcia, E-30071- Murcia, Spain,
- S.U.I.C., Edificio S.A.C.E., Universidad de Murcia,
E-30071-Murcia, Spain,
- Department de Química Inorgànica,
Universitat de Barcelona, Martí i Franquès 1-11, E-08028
Barcelona, Spain, and
- Departamento de Química Inorgánica,
Universidad de Santiago de Compostela, Avda. de las Ciencias s/n,
E-15782 Santiago de Compostela, Spain
| | - Gregorio López
- Departamento de Química Inorgánica,
Universidad de Murcia, E-30071- Murcia, Spain,
- S.U.I.C., Edificio S.A.C.E., Universidad de Murcia,
E-30071-Murcia, Spain,
- Department de Química Inorgànica,
Universitat de Barcelona, Martí i Franquès 1-11, E-08028
Barcelona, Spain, and
- Departamento de Química Inorgánica,
Universidad de Santiago de Compostela, Avda. de las Ciencias s/n,
E-15782 Santiago de Compostela, Spain
| | - Concepción de Haro
- Departamento de Química Inorgánica,
Universidad de Murcia, E-30071- Murcia, Spain,
- S.U.I.C., Edificio S.A.C.E., Universidad de Murcia,
E-30071-Murcia, Spain,
- Department de Química Inorgànica,
Universitat de Barcelona, Martí i Franquès 1-11, E-08028
Barcelona, Spain, and
- Departamento de Química Inorgánica,
Universidad de Santiago de Compostela, Avda. de las Ciencias s/n,
E-15782 Santiago de Compostela, Spain
| | - Delia Bautista
- Departamento de Química Inorgánica,
Universidad de Murcia, E-30071- Murcia, Spain,
- S.U.I.C., Edificio S.A.C.E., Universidad de Murcia,
E-30071-Murcia, Spain,
- Department de Química Inorgànica,
Universitat de Barcelona, Martí i Franquès 1-11, E-08028
Barcelona, Spain, and
- Departamento de Química Inorgánica,
Universidad de Santiago de Compostela, Avda. de las Ciencias s/n,
E-15782 Santiago de Compostela, Spain
| | - Virtudes Moreno
- Departamento de Química Inorgánica,
Universidad de Murcia, E-30071- Murcia, Spain,
- S.U.I.C., Edificio S.A.C.E., Universidad de Murcia,
E-30071-Murcia, Spain,
- Department de Química Inorgànica,
Universitat de Barcelona, Martí i Franquès 1-11, E-08028
Barcelona, Spain, and
- Departamento de Química Inorgánica,
Universidad de Santiago de Compostela, Avda. de las Ciencias s/n,
E-15782 Santiago de Compostela, Spain
| | - Laura Valencia
- Departamento de Química Inorgánica,
Universidad de Murcia, E-30071- Murcia, Spain,
- S.U.I.C., Edificio S.A.C.E., Universidad de Murcia,
E-30071-Murcia, Spain,
- Department de Química Inorgànica,
Universitat de Barcelona, Martí i Franquès 1-11, E-08028
Barcelona, Spain, and
- Departamento de Química Inorgánica,
Universidad de Santiago de Compostela, Avda. de las Ciencias s/n,
E-15782 Santiago de Compostela, Spain
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Ruiz J, Lorenzo J, Sanglas L, Cutillas N, Vicente C, Villa MD, Avilés FX, López G, Moreno V, Pérez J, Bautista D. Palladium(II) and Platinum(II) Organometallic Complexes with the Model Nucleobase Anions of Thymine, Uracil, and Cytosine: Antitumor Activity and Interactions with DNA of the Platinum Compounds. Inorg Chem 2006; 45:6347-60. [PMID: 16878945 DOI: 10.1021/ic060374e] [Citation(s) in RCA: 75] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Pd(II) and Pt(II) complexes with the anions of the model nucleobases 1-methylthymine (1-MethyH), 1-methyluracil (1-MeuraH), and 1-methylcytosine (1-MecytH) of the types [Pd(dmba)(mu-L)]2 [dmba = N,C-chelating 2-((dimethylamino)methyl)phenyl; L = 1-Methy, 1-Meura or 1-Mecyt] and [M(dmba)(L)(L')] [L = 1-Methy or 1-Meura; L' = PPh(3) (M = Pd or Pt), DMSO (M = Pt)] have been obtained. Palladium complexes of the types [Pd(C6F5)(N-N)(L)] [L = 1-Methy or 1-Meura; N-N = N,N,N',N'-tetramethylethylenediamine (tmeda), 2,2'-bipyridine (bpy), or 4,4'-dimethyl-2,2'-bipyridine (Me2bpy)] and [NBu4][Pd(C6F5)(1-Methy)2(H2O)] have also been prepared. The crystal structures of [Pd(dmba)(mu-1-Methy)]2, [Pd(dmba)(mu-1-Mecyt)]2.2CHCl3, [Pd(dmba)(1-Methy)(PPh3)].3CHCl3, [Pt(dmba)(1-Methy)(PPh3)], [Pd(tmeda)(C6F5)(1-Methy)], and [NBu4][Pd(C6F5)(1-Methy)2(H2O)].H2O have been established by X-ray diffraction. The DNA adduct formation of the new platinum complexes synthesized was followed by circular dichroism and electrophoretic mobility. Atomic force microscopy images of the modifications caused by the platinum complexes on plasmid DNA pBR322 were also obtained. Values of IC50 were also calculated for the new platinum complexes against the tumor cell line HL-60. All the new platinum complexes were more active than cisplatin (up to 20-fold in some cases).
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Affiliation(s)
- José Ruiz
- Departamento de Química Inorganica, Universidad de Murcia, 30071-Murcia, Spain.
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Ruiz J, Cutillas N, Vicente C, Villa MD, López G, Lorenzo J, Avilés FX, Moreno V, Bautista D. New palladium(II) and platinum(II) complexes with the model nucleobase 1-methylcytosine: antitumor activity and interactions with DNA. Inorg Chem 2006; 44:7365-76. [PMID: 16212362 DOI: 10.1021/ic0502372] [Citation(s) in RCA: 103] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Palladium and platinum complexes with the model nucleobase 1-methylcytosine (1-Mecyt) of the types [Pd(N-N)(C6F5)(1-Mecyt)]ClO4 [N-N = bis(3,5-dimethylpyrazol-1-yl)methane (bpzm), bis(pyrazol-1-yl)methane (bpzm), N,N,N',N'-tetramethylethylenediamine (tmeda), or 2,2'-bipyridine (bpy)] and [M(dmba)(L')(1-Mecyt)]ClO4 [dmba = N,C-chelating 2-(dimethylaminomethyl)phenyl; L' = PPh(3) (M = Pd or Pt), DMSO (M = Pt)] have been obtained. Palladium and platinum complexes of the types cis-[M(C6F5)2(1-Mecyt)2] (M = Pd or Pt) and cis-[Pd(L')(C6F5)(1-Mecyt)2]ClO4 (L' = PPh(3) or t-BuNC) have also been prepared. The crystal structures of [Pd(bpzm)(C6F5)(1-Mecyt)]ClO4, [Pt(dmba)(DMSO)(1-Mecyt)]ClO4, cis-[Pd(C6F5)2(1-Mecyt)2], and cis-[Pd(t-BuNC)(C6F5)(1-Mecyt)2]ClO4 have been established by X-ray diffraction. There is extensive hydrogen bonding (N-H...O, C-H...F or C-H...O) in all the compounds. There are also intermolecular pi-pi interactions between pyrimidine rings of adjacent chains in [Pd(C6F5)2(1-Mecyt)2]. DNA adduct formation of the new complexes synthesized was followed by circular dichroism and electrophoretic mobility. Atomic force microscopy images of the modifications caused by the complexes on plasmid DNA pBR322 were also obtained. Values of IC(50) were also calculated for the new complexes against the tumor cell line HL-60. At a short incubation time (24 h) almost all new complexes were more active than cisplatin.
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Affiliation(s)
- José Ruiz
- Departamento de Química Inorgánica, Facultad de Química, Universidad de Murcia, 30071 Murcia, Spain.
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Martínez A, Lorenzo J, Prieto MJ, de Llorens R, Font-Bardia M, Solans X, Avilés FX, Moreno V. Synthesis, characterization and biological activity of trans-platinum(II) and trans-platinum(IV) complexes with 4-hydroxymethylpyridine. Chembiochem 2006; 6:2068-77. [PMID: 16222727 DOI: 10.1002/cbic.200500108] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
The synthesis and chemical characterization of two new trans platinum complexes, trans-[PtCl(2)NH(3)(4-hydroxymethylpyridine)] (1) and trans-[PtCl(4)NH(3)(4-hydroxymethylpyridine)] (2) are described. Their ability to interact with 5'-GMP by themselves and in the presence of reducing agents in the case of trans-[PtCl(4)NH(3)(4-hydroxymethylpyridine)] were tested. Circular dichroism, electrophoretic mobility in agarose gel, and atomic force microscopy studies showed that the interaction of complex 1 with DNA is stronger than that of complex 2. Cytotoxicity tests against HL-60 tumor cells also showed higher activity for trans-[PtCl(2)NH(3)(4-hydroxymethylpyridine)] than for trans-[PtCl(4)NH(3)(4-hydroxymethylpyridine)]. Complex 1 presents similar behavior to cisplatin, but with a lower IC(50) at 24 h. Complex 1 also showed high apoptosis induction.
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Affiliation(s)
- Alberto Martínez
- Departament de Química Inorgánica, Universitat de Barcelona, Diagonal 647, 08028 Barcelona, Spain
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Sanina N, Rudneva T, Aldoshin S, Shilov G, Kortchagin D, Shul’ga Y, Martynenko V, Ovanesyan N. Influence of CH3 group of μ-N–C–S ligand on the properties of [Fe2(C4H5N2S)2(NO)4] complex. Inorganica Chim Acta 2006. [DOI: 10.1016/j.ica.2005.10.005] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Moradell S, Lorenzo J, Rovira A, van Zutphen S, Avilés FX, Moreno V, de Llorens R, Martinez MA, Reedijk J, Llobet A. Water-soluble platinum(II) complexes of diamine chelating ligands bearing amino-acid type substituents: the effect of the linked amino acid and the diamine chelate ring size on antitumor activity, and interactions with 5'-GMP and DNA. J Inorg Biochem 2005; 98:1933-46. [PMID: 15522419 DOI: 10.1016/j.jinorgbio.2004.08.011] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2003] [Revised: 07/12/2004] [Accepted: 08/17/2004] [Indexed: 11/21/2022]
Abstract
Six new Pt(II) complexes are described having the general formula PtCl(2)(LL), in which LL is a chelating diamine ligand bearing an amino acid as substituent. The amino acids chosen are l-alanine and its methyl ester, and l-phenylalanine. The compounds have been characterized using analytical and spectroscopic methods. The influence on the biological properties of the size of the chelate ring and the structure of the amino acid substituent has been studied. The effect of the presence of a carboxylic or carboxylate group on the amino acid C-terminus has also been determined. It is demonstrated by circular dichroism (CD) that the effect on the secondary structure of DNA induced by the six complexes differ from each other. In all cases, the interaction takes place at the N7 position of the purine bases, as shown by NMR monitoring. The general behavior of these platinum complexes, with one exception, is to uncoil the DNA from the B form to the C form. The interactions with 5'-GMP and DNA have been compared with their expected antitumour activity. The complexes with l-alanine and l-phenylalanine exhibit cytotoxic activity in HeLa and HL-60 cell lines, in a dose- and time-dependent manner. No cytotoxic activity of the methyl ester derivatives have been determined because of their low solubility in aqueous solution.
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Affiliation(s)
- Silvia Moradell
- Departament de Química, Area de Química Inorgànica, Facultat de Ciències, Universitat de Girona, Av. Montilivi s/n, 17071 Girona, Spain
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25
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Angeles-Boza AM, Bradley PM, Fu PKL, Wicke SE, Bacsa J, Dunbar KR, Turro C. DNA binding and photocleavage in vitro by new dirhodium(II) dppz complexes: correlation to cytotoxicity and photocytotoxicity. Inorg Chem 2005; 43:8510-9. [PMID: 15606200 DOI: 10.1021/ic049091h] [Citation(s) in RCA: 161] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Two new dirhodium(II) complexes possessing the intercalating dppz ligand (dppz = dipyrido[3,2-a:2',3'-c]phenazine), cis-[Rh(2)(mu-O(2)CCH(3))(2)(dppz)(eta(1)-O(2)CCH(3))(CH(3)OH)](+) (1) and cis-[Rh(2)(mu-O(2)CCH(3))(2)(dppz)(2)](2+) (2), were synthesized and characterized as potential agents for photochemotherapy. Various techniques show that 1 binds to DNA through intercalation, although some aggregation of the complex on the DNA surface is also present. In contrast, 2 does not intercalate between the DNA bases; however, strong hypochromic behavior is observed in the presence of DNA, which can be attributed to intermolecular pi-stacking of 2 enhanced by the polyanion. The apparent DNA binding constants determined using optical titrations are compared to those from dialysis experiments. Both complexes photocleave pUC18 plasmid in vitro under irradiation with visible light (lambda(irr) >or= 395 nm, 15 min), resulting in the nicked, circular form. Greater photocleavage is observed for 1 relative to 2, which may be due to the ability of 1 to intercalate between the DNA bases. The cytotoxicity toward human skin cells (Hs-27) measured as the concentration at which 50% cell death is recorded, LC(50), was found to be 135 +/- 8 microM for 2 in the dark (30 min), which is significantly lower than those of 1 (LC(50) = 27 +/- 2 microM) and Rh(2)(O(2)CCH(3))(4) (LC(50) = 15 +/- 2 microM). Irradiation of cell cultures containing 1 and Rh(2)(O(2)CCH(3))(4) with visible light (400-700 nm, 30 min) has little effect on their cytotoxicity, with LC(50) values of 21 +/- 3 and 13 +/- 2 microM, respectively. Interestingly, a 3.4-fold increase in the toxicity of 2 is observed when the cell cultures are irradiated (400-700 nm, 30 min), resulting in LC(50) = 39 +/- 1 microM. The greater toxicity of 1 compared to 2 in the dark may be related to the ability of the former compound to intercalate between the DNA bases. The lower cytotoxicity of 2, together with its significantly greater photocytotoxicity, makes this complex a potential agent for photodynamic therapy (PDT). These results suggest that intercalation or strong DNA binding may not be a desirable property of a potential PDT agent.
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Amat E, Prieto MJ, Moreno V. Comparative study between the interaction of dephosphorylated amifostine (WR-1065) and amoxicilline with pBR322 in absence and presence of cisplatin by AFM. Int J Pharm 2004; 270:75-82. [PMID: 14726124 DOI: 10.1016/j.ijpharm.2003.10.035] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The effect of the amoxicilline as a possible cisplatin-action protector on pBR322 DNA has been visually studied by atomic force microscopy in comparison with the modifications caused by the controversed cisplatin protector amifostine. Incubation of amoxicilline with the plasmid DNA showed aggregation and compaction of DNA. Cisplatin incubated in the same conditions with DNA produced kinks and super-coiling of the circular form. In the case of previous treatment of DNA with amoxicilline, the characteristic effect of cisplatin is only partially observed. The amoxicilline seemed to control the action of cisplatin on DNA. The initial effect of dephosphorylated amifostine (WR-1065) when this protector was incubated with the plasmid was also the formation of aggregates and the compaction of DNA. However, addition of cisplatin successively after 1 and 2 h showed the characteristic modification caused by cisplatin but only in a decreasing percentage of molecules of DNA. Both molecules, amoxicilline and WR-1065 seem to control the strong direct action of cisplatin on DNA. This effect can justify the role as protecting agent of amifostine on side effects caused by cisplatin and can open new possibilities to other agents like amoxicilline.
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Affiliation(s)
- E Amat
- Departament de Físicoquímica, Facultat de Farmàcia, Universitat de Barcelona, Diagonal 643, 08028 Barcelona, Spain
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Martos-Calvente R, de la Peña O'Shea VA, Campos-Martin JM, Fierro JLG. The Usefulness of Density Functional Theory To Describe the Tautomeric Equilibrium of 4,6-Dimethyl-2-mercaptopyrimidine in Solution. J Phys Chem A 2003. [DOI: 10.1021/jp0347015] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Raul Martos-Calvente
- Instituto de Catálisis y Petroleoquímica, CSIC, Cantoblanco, 28049 Madrid, Spain
| | | | | | - Jose L. G. Fierro
- Instituto de Catálisis y Petroleoquímica, CSIC, Cantoblanco, 28049 Madrid, Spain
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