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New insights into the mechanism of action of the cyclopalladated complex - CP2 in Leishmania: Calcium Dysregulation, Mitochondrial Dysfunction and Cell Death. Antimicrob Agents Chemother 2021; 66:e0076721. [PMID: 34633848 DOI: 10.1128/aac.00767-21] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
The current treatment of leishmaniasis is based on few drugs that present several drawbacks such as high toxicity, difficult administration route, and low efficacy. These disadvantages raise the necessity to develop novel antileishmanial compounds allied to a comprehensive understanding of their mechanisms of action. Here, we elucidate the probably mechanism of action of the antileishmanial binuclear cyclopalladated complex [Pd(dmba)(μ-N3)]2 (CP2) in Leishmania amazonensis. CP2 causes oxidative stress in the parasite resulting in disruption of mitochondrial Ca2+ homeostasis, cell cycle arrest at S-phase, increasing the ROS production and overexpression of stress-related and cell detoxification proteins, collapsing the Leishmania mitochondrial membrane potential and promotes apoptotic-like features in promastigotes leading to necrosis or directs programmed cell death (PCD)-committed cells toward necrotic-like destruction. Moreover, CP2 is able to reduce the parasite load in both liver and spleen in Leishmania infantum-infected hamsters when treated for 15 days with 1.5 mg/Kg/day CP2, expanding its potential application in addition to the already known effectiveness on cutaneous leishmaniasis for the treatment of visceral leishmaniasis, showing the broad spectrum of action of this cyclopalladated complex. The data herein presented bring new insights into the CP2 molecular mechanisms of action, assisting to promote its rational modification to improve both safety and efficacy.
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2
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Takeuchi K, Kim KW, Kim YJ, Fukaya N, Sato K, Choi JC. Synthesis and Structure of Multinuclear Pd(II) Complexes Bridged by Phosphide or Azide Ligands. ACS OMEGA 2020; 5:29706-29713. [PMID: 33251406 PMCID: PMC7689659 DOI: 10.1021/acsomega.0c03317] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/10/2020] [Accepted: 10/22/2020] [Indexed: 06/12/2023]
Abstract
The synthesis and structure of phosphide- and azide-bridged multinuclear Pd(II) complexes bearing phosphine ligands [PdX(μ-X')(PR3)] n (X = Cl and N3; X' = PR2 ' and N3; n = 2 and 4) are reported. The oxidative addition of R2 'PCl to Pd(PMe3)2 furnished the phosphide-bridged dinuclear Pd(II) complexes [PdCl(μ-PR2 ')(PMe3)]2 [R' = i Pr (1a) and Cy (1b)]. However, the oxidative addition of (o-tolyl)2PCl to Pd(PMe3)2 produced a nonbridged mononuclear Pd(II) complex with the bis(o-tolyl)phosphinic ligand, trans-[Pd(PMe3)2{P(O)(o-tolyl)2}] (2), via oxidation of the phosphinyl ligand. The reaction of the chloride-bridged dinuclear Pd(II) complexes [PdCl(μ-Cl)(PR3)]2 [PR3 = PEt3 (3a) and PPhMe2 (3b)] with NaN3 afforded the azide-bridged dinuclear and tetranuclear Pd(II) complexes [Pd(N3)(μ-N3)(PEt3)]2 (4) and [Pd(N3)(μ-N3)(PPhMe2)]4 (5). Comparisons of the X-ray structures of 4 and 5 show that the square-planar molecular geometry of the Pd(II) centers of 4 are more distorted than those of 5. Density functional theory calculations suggest that the tetranuclear eight-membered ring structure like 5 is more stable than the dinuclear four-membered ring structure like 4 in the gas phase in both PEt3 and PPhMe2 systems. However, because the relative energy difference between the four-membered and eight-membered ring structures is small in the PEt3 system with smaller steric hindrance compared with PPhMe2, it is assumed that this difference is compensated by the crystal packing energy, and the dinuclear four-membered ring complex 4 is actually obtained.
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Affiliation(s)
- Katsuhiko Takeuchi
- National
Institute of Advanced Industrial Science and Technology (AIST), Tsukuba Central 5, 1-1-1 Higashi, Tsukuba 305-8565, Ibaraki, Japan
| | - Kun-Woo Kim
- Department
of Chemistry, Kangnung-Wonju National University, Gangneung 210-702, Korea
| | - Yong-Joo Kim
- Department
of Chemistry, Kangnung-Wonju National University, Gangneung 210-702, Korea
| | - Norihisa Fukaya
- National
Institute of Advanced Industrial Science and Technology (AIST), Tsukuba Central 5, 1-1-1 Higashi, Tsukuba 305-8565, Ibaraki, Japan
| | - Kazuhiko Sato
- National
Institute of Advanced Industrial Science and Technology (AIST), Tsukuba Central 5, 1-1-1 Higashi, Tsukuba 305-8565, Ibaraki, Japan
| | - Jun-Chul Choi
- National
Institute of Advanced Industrial Science and Technology (AIST), Tsukuba Central 5, 1-1-1 Higashi, Tsukuba 305-8565, Ibaraki, Japan
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da Cunha GA, de Souza RFF, de Farias RL, Moreira MB, Silva DES, Zanetti RD, Garcia DM, Spindola DG, Michelin LFG, Bincoletto C, de Souza AA, Antunes AA, Judice WADS, Leitao RCF, Deflon VM, Mauro AE, Netto AVG. Cyclopalladated compounds containing 2,6-lutidine: Synthesis, spectral and biological studies. J Inorg Biochem 2019; 203:110944. [PMID: 31794895 DOI: 10.1016/j.jinorgbio.2019.110944] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2019] [Revised: 11/18/2019] [Accepted: 11/20/2019] [Indexed: 02/07/2023]
Abstract
Bridge splitting reactions between [Pd(C2,N-dmba)(μ-X)]2 (dmba = N,N-dimethylbenzylamine; X = Cl, I, N3, NCO) and 2,6-lutidine (lut) in the 1:2 molar ratio at room temperature afforded cyclopalladated compounds of general formulae [Pd(C2,N-dmba)(X)(lut)] {X = Cl- (1), I-(2), NNN-(3), NCO-(4)}, which were characterized by elemental analyses and infrared (IR), 1H NMR spectroscopy. The molecular structures of all synthesized palladacycles have been solved by single-crystal X-ray crystallography. The cytotoxicity of the cyclopalladated compounds has been evaluated against a panel of murine {mammary carcinoma (4T1) and melanoma (B16F10-Nex2)} and human {melanoma (A2058, SK-MEL-110 and SK-MEL-5) tumor cell lines. All complexes were about 10 to 100-fold more active than cisplatin, depending on the tested tumor cell line. For comparison purposes, the cytotoxic effects of 1-4 towards human lung fibroblasts (MRC-5) have also been tested. The late apoptosis-inducing properties of 1-4 compounds in SK-MEL-5 cells were verified 24 h incubation using annexin V-Fluorescein isothiocyanate (FITC)/propidium iodide (PI). The binding properties of the model compound 1 on human serum albumin (HSA) and calf thymus DNA (ct-DNA) have been studied using circular dichroism and fluorescence spectroscopy. Docking simulations have been carried out to gain more information about the interaction of the palladacycle and HSA. The ability of compounds 1-4 to inhibit the activity of cathepsin B and L has also been investigated in this work.
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Affiliation(s)
- Gislaine A da Cunha
- UNESP - Univ Estadual Paulista, Institute of Chemistry, 14800-060 Araraquara, SP, Brazil
| | - Ronan F F de Souza
- UNESP - Univ Estadual Paulista, Institute of Chemistry, 14800-060 Araraquara, SP, Brazil
| | - Renan L de Farias
- UNESP - Univ Estadual Paulista, Institute of Chemistry, 14800-060 Araraquara, SP, Brazil
| | - Mariete B Moreira
- UNESP - Univ Estadual Paulista, Institute of Chemistry, 14800-060 Araraquara, SP, Brazil
| | - Débora E S Silva
- UNESP - Univ Estadual Paulista, Institute of Chemistry, 14800-060 Araraquara, SP, Brazil
| | - Renan D Zanetti
- UNESP - Univ Estadual Paulista, Institute of Chemistry, 14800-060 Araraquara, SP, Brazil
| | - Daniel M Garcia
- São Paulo Federal University (UNIFESP), Department of Pharmacology, São Paulo Medicinal School, 04044-020 São Paulo, SP, Brazil
| | - Daniel G Spindola
- São Paulo Federal University (UNIFESP), Department of Pharmacology, São Paulo Medicinal School, 04044-020 São Paulo, SP, Brazil
| | - Luis F G Michelin
- São Paulo Federal University (UNIFESP), Department of Pharmacology, São Paulo Medicinal School, 04044-020 São Paulo, SP, Brazil
| | - Claudia Bincoletto
- São Paulo Federal University (UNIFESP), Department of Pharmacology, São Paulo Medicinal School, 04044-020 São Paulo, SP, Brazil
| | - Aline A de Souza
- Centro Interdisciplinar de Investigação Bioquímica -CIIB, Universidade de Mogi das Cruzes, Av. Cândido Xavier de Almeida Souza, 200-CEP: 08701-970, CP: 411, Mogi das Cruzes, SP, Brazil
| | - Alyne A Antunes
- Centro Interdisciplinar de Investigação Bioquímica -CIIB, Universidade de Mogi das Cruzes, Av. Cândido Xavier de Almeida Souza, 200-CEP: 08701-970, CP: 411, Mogi das Cruzes, SP, Brazil
| | - Wagner A de S Judice
- Centro Interdisciplinar de Investigação Bioquímica -CIIB, Universidade de Mogi das Cruzes, Av. Cândido Xavier de Almeida Souza, 200-CEP: 08701-970, CP: 411, Mogi das Cruzes, SP, Brazil
| | - Renan C F Leitao
- University of São Paulo (USP), São Carlos Institute of Chemistry (IQSC), 13566-590 São Carlos, SP, Brazil
| | - Victor M Deflon
- University of São Paulo (USP), São Carlos Institute of Chemistry (IQSC), 13566-590 São Carlos, SP, Brazil
| | - Antônio E Mauro
- UNESP - Univ Estadual Paulista, Institute of Chemistry, 14800-060 Araraquara, SP, Brazil
| | - Adelino V G Netto
- UNESP - Univ Estadual Paulista, Institute of Chemistry, 14800-060 Araraquara, SP, Brazil.
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Bozza GF, de Farias RL, de Souza RF, Rocha FV, Barra CV, Deflon VM, de Almeida ET, Mauro AE, Netto AV. Palladium orthometallated complexes containing acetophenoneoxime: Synthesis, crystal structures and hirshfeld surface analysis. J Mol Struct 2019. [DOI: 10.1016/j.molstruc.2018.07.108] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Velásquez AMA, Ribeiro WC, Venn V, Castelli S, Camargo MSD, de Assis RP, de Souza RA, Ribeiro AR, Passalacqua TG, da Rosa JA, Baviera AM, Mauro AE, Desideri A, Almeida-Amaral EE, Graminha MAS. Efficacy of a Binuclear Cyclopalladated Compound Therapy for Cutaneous Leishmaniasis in the Murine Model of Infection with Leishmania amazonensis and Its Inhibitory Effect on Topoisomerase 1B. Antimicrob Agents Chemother 2017; 61:e00688-17. [PMID: 28507113 PMCID: PMC5527659 DOI: 10.1128/aac.00688-17] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2017] [Accepted: 05/02/2017] [Indexed: 12/29/2022] Open
Abstract
Leishmaniasis is a disease found throughout the (sub)tropical parts of the world caused by protozoan parasites of the Leishmania genus. Despite the numerous problems associated with existing treatments, pharmaceutical companies continue to neglect the development of better ones. The high toxicity of current drugs combined with emerging resistance makes the discovery of new therapeutic alternatives urgent. We report here the evaluation of a binuclear cyclopalladated complex containing Pd(II) and N,N'-dimethylbenzylamine (Hdmba) against Leishmania amazonensis The compound [Pd(dmba)(μ-N3)]2 (CP2) inhibits promastigote growth (50% inhibitory concentration [IC50] = 13.2 ± 0.7 μM) and decreases the proliferation of intracellular amastigotes in in vitro incubated macrophages (IC50 = 10.2 ± 2.2 μM) without a cytotoxic effect when tested against peritoneal macrophages (50% cytotoxic concentration = 506.0 ± 10.7 μM). In addition, CP2 was also active against T. cruzi intracellular amastigotes (IC50 = 2.3 ± 0.5 μM, selective index = 225), an indication of its potential for use in Chagas disease therapy. In vivo assays using L. amazonensis-infected BALB/c showed an 80% reduction in parasite load compared to infected and nontreated animals. Also, compared to amphotericin B treatment, CP2 did not show any side effects, which was corroborated by the analysis of plasma levels of different hepatic and renal biomarkers. Furthermore, CP2 was able to inhibit Leishmania donovani topoisomerase 1B (Ldtopo1B), a potentially important target in this parasite. (This study has been registered at ClinicalTrials.gov under identifier NCT02169141.).
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Affiliation(s)
- Angela Maria Arenas Velásquez
- São Paulo State University (UNESP), School of Pharmaceutical Sciences, Araraquara, Brazil
- São Paulo State University (UNESP), Institute of Chemistry, Araraquara, Brazil
| | - Willian Campos Ribeiro
- São Paulo State University (UNESP), School of Pharmaceutical Sciences, Araraquara, Brazil
| | - Vutey Venn
- University of Rome, Tor Vergata, Rome, Italy
| | | | | | - Renata Pires de Assis
- São Paulo State University (UNESP), School of Pharmaceutical Sciences, Araraquara, Brazil
| | | | | | - Thaís Gaban Passalacqua
- São Paulo State University (UNESP), School of Pharmaceutical Sciences, Araraquara, Brazil
- São Paulo State University (UNESP), Institute of Chemistry, Araraquara, Brazil
| | - João Aristeu da Rosa
- São Paulo State University (UNESP), School of Pharmaceutical Sciences, Araraquara, Brazil
| | - Amanda Martins Baviera
- São Paulo State University (UNESP), School of Pharmaceutical Sciences, Araraquara, Brazil
| | | | | | | | - Marcia A S Graminha
- São Paulo State University (UNESP), School of Pharmaceutical Sciences, Araraquara, Brazil
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Pyrazolyl Pd(II) complexes containing triphenylphosphine: Synthesis and antimycobacterial activity. Polyhedron 2015. [DOI: 10.1016/j.poly.2015.07.009] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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7
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Asymmetric and symmetric triazenido cyclopalladated complexes: Synthesis, structural analysis and DFT calculations. J Mol Struct 2015. [DOI: 10.1016/j.molstruc.2014.11.069] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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8
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da Silva C, Ferreira J, Mauro A, Frem R, Santos R, da Silva P, Pavan F, Marino L, Leite C, Netto A. Synthesis and antimycobacterial activity of new pyrazolate-bridged dinuclear complexes of the type [Pd(μ-L)(N 3 )(PPh 3 )] 2 (PPh 3 = triphenylphosphine; L = pyrazolates). INORG CHEM COMMUN 2014. [DOI: 10.1016/j.inoche.2014.09.001] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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9
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Karami K, Hosseini-Kharat M, Sadeghi-Aliabadi H, Lipkowski J, Mirian M. In vitro cytotoxicity studies of palladacyclic complexes containing the symmetric diphosphine bridging ligand. Studies of their interactions with DNA and BSA. Eur J Med Chem 2014; 73:8-17. [DOI: 10.1016/j.ejmech.2013.11.042] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2013] [Revised: 11/18/2013] [Accepted: 11/24/2013] [Indexed: 10/25/2022]
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10
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Barra CV, Rocha FV, Gautier A, Morel L, Quilles MB, Carlos IZ, Treu-Filho O, Frem RC, Mauro AE, Netto AV. Synthesis, cytotoxic activity and DNA interaction of Pd(II) complexes bearing N′-methyl-3,5-dimethyl-1-thiocarbamoylpyrazole. Polyhedron 2013. [DOI: 10.1016/j.poly.2013.08.040] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
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11
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From a di- and trinuclear phosphanido fragment to tetra- and hexanuclear platinum(II) complexes. Inorganica Chim Acta 2013. [DOI: 10.1016/j.ica.2013.07.048] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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12
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Sluch IM, Miranda AJ, Elbjeirami O, Omary MA, Slaughter LM. Interplay of Metallophilic Interactions, π–π Stacking, and Ligand Substituent Effects in the Structures and Luminescence Properties of Neutral PtII and PdII Aryl Isocyanide Complexes. Inorg Chem 2012; 51:10728-46. [DOI: 10.1021/ic301104a] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- Ilya M. Sluch
- Department of Chemistry, Oklahoma State University, Stillwater, Oklahoma 74078,
United States
| | - Anthea J. Miranda
- Department of Chemistry, Oklahoma State University, Stillwater, Oklahoma 74078,
United States
| | - Oussama Elbjeirami
- Department
of Chemistry, University of North Texas, Denton, Texas 76203, United
States
| | - Mohammad A. Omary
- Department
of Chemistry, University of North Texas, Denton, Texas 76203, United
States
| | - LeGrande M. Slaughter
- Department of Chemistry, Oklahoma State University, Stillwater, Oklahoma 74078,
United States
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Arroyo M, Gómez‐Iglesias P, Santos Melero J, Schildbach D, Unkelbach C, Strohmann C, Villafañe F. Bridging Pseudohalides in Palladacycles as a Source of Different Assemblies. Eur J Inorg Chem 2012. [DOI: 10.1002/ejic.201200247] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Marta Arroyo
- IU CINQUIMA/Química Inorgánica, Facultad de Ciencias, Universidad de Valladolid, 47005 Valladolid, Spain, Fax: +34‐983‐423‐013
| | - Patricia Gómez‐Iglesias
- IU CINQUIMA/Química Inorgánica, Facultad de Ciencias, Universidad de Valladolid, 47005 Valladolid, Spain, Fax: +34‐983‐423‐013
| | - José Santos Melero
- IU CINQUIMA/Química Inorgánica, Facultad de Ciencias, Universidad de Valladolid, 47005 Valladolid, Spain, Fax: +34‐983‐423‐013
| | - Daniel Schildbach
- Technische Universität Dortmund, Anorganische Chemie, Otto‐Hahn‐Straße 6, 44227 Dortmund, Germany, Fax: +49‐231‐755‐7062
| | - Christian Unkelbach
- Technische Universität Dortmund, Anorganische Chemie, Otto‐Hahn‐Straße 6, 44227 Dortmund, Germany, Fax: +49‐231‐755‐7062
| | - Carsten Strohmann
- Technische Universität Dortmund, Anorganische Chemie, Otto‐Hahn‐Straße 6, 44227 Dortmund, Germany, Fax: +49‐231‐755‐7062
| | - Fernando Villafañe
- IU CINQUIMA/Química Inorgánica, Facultad de Ciencias, Universidad de Valladolid, 47005 Valladolid, Spain, Fax: +34‐983‐423‐013
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Moro AC, Urbaczek AC, De Almeida ET, Pavan FR, Leite CQ, Netto AV, Mauro AE. Binuclear cyclopalladated compounds with antitubercular activity: synthesis and characterization of [{Pd(C2,N-dmba)(X)}2(μ-bpp)] (X = Cl, Br, NCO, N3; bpp = 1,3-bis(4-pyridyl)propane). J COORD CHEM 2012. [DOI: 10.1080/00958972.2012.673718] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Affiliation(s)
- Antonio C. Moro
- a Departamento de Química Geral e Inorgânica , Instituto de Química, UNESP , CEP 14801-970, Araraquara , SP , Brazil
| | - Ana C. Urbaczek
- b Departamento de Análises Clínicas, Faculdade de Ciências Farmacêuticas , UNESP , CEP 14801-902, Araraquara , SP , Brazil
| | | | - Fernando R. Pavan
- d Departamento de Ciências Biológicas, Faculdade de Ciências Farmacêuticas , UNESP , CEP 14800-900, Araraquara , SP , Brazil
| | - Clarice Q.F. Leite
- d Departamento de Ciências Biológicas, Faculdade de Ciências Farmacêuticas , UNESP , CEP 14800-900, Araraquara , SP , Brazil
| | - Adelino V.G. Netto
- a Departamento de Química Geral e Inorgânica , Instituto de Química, UNESP , CEP 14801-970, Araraquara , SP , Brazil
| | - Antonio E. Mauro
- a Departamento de Química Geral e Inorgânica , Instituto de Química, UNESP , CEP 14801-970, Araraquara , SP , Brazil
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15
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A self-assembled (H2O)20(CH3OH)4 binary cluster containing a grail-shaped hexadecameric water cluster trapped in the cavity of a metal-ligand hybrid. Sci China Chem 2012. [DOI: 10.1007/s11426-012-4566-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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16
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Takahashi O, Kohno Y, Nishio M. Relevance of weak hydrogen bonds in the conformation of organic compounds and bioconjugates: evidence from recent experimental data and high-level ab initio MO calculations. Chem Rev 2011; 110:6049-76. [PMID: 20550180 DOI: 10.1021/cr100072x] [Citation(s) in RCA: 447] [Impact Index Per Article: 34.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Osamu Takahashi
- Department of Chemistry, Graduate School of Science, Hiroshima University, Kagamiyama, Higashi-Hiroshima, 739-8526, Japan.
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17
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Santana AM, Ferreira JG, Moro AC, Lemos SC, Mauro AE, Netto AV, Frem RC, Santos RH. Self-assembly of cyclometallated Pd(II) compounds directed by C–H⋅⋅⋅π interactions: A structural evidence for metalloaromaticity in a cyclopalladated ring. INORG CHEM COMMUN 2011. [DOI: 10.1016/j.inoche.2010.09.037] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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18
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Pou D, López C, Pérez S, Solans X, Font-Bardía M, van Leeuwen PWNM, van Strijdonck GPF. Study on the Lability of the σ(Pd-S) Bond of Novel Palladacycles with [C(sp2,ferrocene),N,S(thienyl)]- Pincer Ligands. Eur J Inorg Chem 2010. [DOI: 10.1002/ejic.200901094] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Mögele F, Fantauzzi D, Wiedwald U, Ziemann P, Rieger B. Two-dimensional assembly of magnetic binuclear complexes: a scanning tunneling microscopy study. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2009; 25:13606-13613. [PMID: 19670886 DOI: 10.1021/la9019712] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Mono- and binuclear metal-organic compounds bearing long alkyl chains were synthesized and studied at the liquid/graphite interface using scanning tunneling microscopy. Two different lamellar surface patterns as well as a star like structure were obtained driven by van der Waals interactions of the alkyl chains and weak hydrogen bonds of the phenoxy moieties. In the case of the star like structure solvent molecules (1,2,4-trichlorobenzene) are supposed to play an important role for the stabilization of the created pattern. Magnetic investigation of the bulk material by a superconducting quantum interference device magnetometer revealed magnetic moments up to 1.7 mu(B) (NiCo) and most likely antiferromagnetic coupling between the two metals within a single complex. The presented two-dimensional crystallization of the binuclear complexes may provide an easy access to new designable materials in molecular electronics.
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Affiliation(s)
- Florian Mögele
- Institute of Material and Catalysis, University of Ulm,Albert-Einstein-Allee 11, D-89069 Ulm, Germany
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Moro AC, Mauro AE, Netto AVG, Ananias SR, Quilles MB, Carlos IZ, Pavan FR, Leite CQF, Hörner M. Antitumor and antimycobacterial activities of cyclopalladated complexes: X-ray structure of [Pd(C2,N-dmba)(Br)(tu)] (dmba=N,N-dimethylbenzylamine, tu=thiourea). Eur J Med Chem 2009; 44:4611-5. [PMID: 19632008 DOI: 10.1016/j.ejmech.2009.06.032] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2009] [Revised: 05/27/2009] [Accepted: 06/29/2009] [Indexed: 11/30/2022]
Abstract
The reactions between [Pd(C(2),N-dmba)(micro-X)](2) (dmba=N,N-dimethylbenzylamine; X=Cl, Br) and thiourea (tu) in the 1:2 molar ratio at room temperature resulted in the mononuclear compounds [Pd(C(2),N-dmba)(Cl)(tu)] (1) and [Pd(C(2),N-dmba)(Br)(tu)] (2), which were characterized by elemental analyses and infrared (IR), (1)H- and (13)C{(1)H} NMR spectroscopies. The crystal and molecular structures of 2 were determined by single-crystal X-ray diffraction. In vitro cytotoxicity assays of the compounds 1, 2, tu, dmba and cisplatin were carried out using two murine tumor cell lines, namely mammary adenocarcinoma (LM3) and lung adenocarcinoma (LP07). The compounds 1, 2, tu and dmba were also tested against Mycobacterium tuberculosis and their MIC values were determined.
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Affiliation(s)
- Antonio C Moro
- Departamento de Química Geral e Inorgânica, Instituto de Química, UNESP, CEP, 14801-970 Araraquara, SP, Brazil
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Treu-Filho O, Rocha FV, Netto AV, Pinheiro JC, Utuni VH, Kondo RT, Mauro AE. Molecular structures and vibrational frequencies for [PdX2(tdmPz)] (X=Cl−, SCN−): A DFT study. J Mol Struct 2009. [DOI: 10.1016/j.molstruc.2008.12.066] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Nishio M, Umezawa Y, Honda K, Tsuboyama S, Suezawa H. CH/π hydrogen bonds in organic and organometallic chemistry. CrystEngComm 2009. [DOI: 10.1039/b902318f] [Citation(s) in RCA: 481] [Impact Index Per Article: 32.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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MAURO AE, NETTO AVG, MORO AC, FERREIRA JG, SANTOS RHA, de ALMEIDA ET. Molecular and Crystal Structure of Di(.MU.-N,S-thiocyanato)-bis[(N,N-dimethylbenzylamine-C2,N)palladium(II)]. X-RAY STRUCTURE ANALYSIS ONLINE 2009. [DOI: 10.2116/xraystruct.25.65] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Affiliation(s)
- Antonio E. MAURO
- Departamento de Química Geral e Inorgânica, Instituto de Química de Araraquara-UNESP
| | - Adelino V. G. NETTO
- Departamento de Química Geral e Inorgânica, Instituto de Química de Araraquara-UNESP
| | - Antonio C. MORO
- Departamento de Química Geral e Inorgânica, Instituto de Química de Araraquara-UNESP
| | - Janaina G. FERREIRA
- Departamento de Química Geral e Inorgânica, Instituto de Química de Araraquara-UNESP
- Departamento de Química e Física Molecular, Instituto de Química-USP
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