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Bellucci N, Donzello MP, Amati M, Viola E, Rizzoli C, Ercolani C, Ricciardi G, Rosa A. Bis(CBT)palladium(II) Derivatives (CBT = m-carborane-1-thiolate): Synthesis, Molecular Structure, and Physicochemical Properties of cis-[(bipy)Pd(CBT) 2] and trans-[(py) 2Pd(CBT) 2]. Inorg Chem 2021; 60:10478-10491. [PMID: 34228447 DOI: 10.1021/acs.inorgchem.1c01092] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The new synthesized PdII complex cis-[(bipy)Pd(CBT)2] (bipy = 2,2'-bipyridyl; CBT = m-carborane-1-thiolate anion), which is a potential BNCT (boron neutron capture therapy) agent and of structure elucidated by single-crystal X-ray work, has been studied by infrared (IR) and ultraviolet-visible light (UV-vis) spectra and its properties compared with those of the previously reported and also the structurally characterized analogue trans-[(py)2Pd(CBT)2]. This trans species, prepared via a direct method, was previously isolated from a pyridine solution, consequent to the occurring releasing of the external Pd(CBT)2 moieties of the porphyrazine macrocycle [{Pd(CBT)2}4LZn]·xH2O (L = tetrakis-2,3-[5,6-di(2-pyridyl)pyrazino]porphyrazinato anion), which is an active photosensitizer in photodynamic therapy (PDT) and a potential bimodal PDT/BNCT agent. The UV-vis spectral behavior of both cis and trans species in CHCl3 solution and in the gas phase has been examined in detail by density functional theory (DFT) and time-dependent density functional theory (TDDFT) studies devoted to explain their distinct behavior observed in the region of 400-500 nm, as determined by the presence in the cis structure of a vicinal arrangement of the two CBT groups, an ensemble of results closely similar to those observed for the macrocycles [{Pd(CBT)2}4LM]·xH2O (M = MgII(H2O), ZnII, PdII). It has also been experimentally proved the tendency of the cis isomer in CHCl3/pyridine solution to be changed to the respective trans analogue, with conversion occurring in two steps, as interpreted by detailed DFT studies.
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Affiliation(s)
- Noemi Bellucci
- Dipartimento di Chimica, Università di Roma Sapienza, P. le A. Moro 5, I-00185 Roma, Italy
| | - Maria Pia Donzello
- Dipartimento di Chimica, Università di Roma Sapienza, P. le A. Moro 5, I-00185 Roma, Italy
| | - Mario Amati
- Dipartimento di Scienze, Università della Basilicata, Viale dell'Ateneo Lucano 10, I-85100 Potenza, Italy
| | - Elisa Viola
- Dipartimento di Chimica, Università di Roma Sapienza, P. le A. Moro 5, I-00185 Roma, Italy
| | - Corrado Rizzoli
- Dipartimento di Scienze Chimiche, della Vita e della Sostenibilità Ambientale, Università di Parma, Parco Area delle Scienze 17/A, I-43124 Parma, Italy
| | - Claudio Ercolani
- Dipartimento di Chimica, Università di Roma Sapienza, P. le A. Moro 5, I-00185 Roma, Italy
| | - Giampaolo Ricciardi
- Università della Basilicata, Scuola di Scienze Agrarie, Forestali, Alimentari e Ambientali (SAFE), Viale dell'Ateneo Lucano 10, I-85100 Potenza, Italy
| | - Angela Rosa
- Dipartimento di Scienze, Università della Basilicata, Viale dell'Ateneo Lucano 10, I-85100 Potenza, Italy
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Affiliation(s)
- Jay A. Labinger
- Beckman Institute, California Institute of Technology, Pasadena, California 91125, United States
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Melník M, Mikuš P. Organophosphines in organoplatinum complexes – structural aspects of cis-PtP2C2 derivatives. J Organomet Chem 2016. [DOI: 10.1016/j.jorganchem.2016.01.007] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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4
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Woolley MJ, Khairallah GN, da Silva G, Donnelly PS, Yates BF, O’Hair RAJ. Role of the Metal, Ligand, and Alkyl/Aryl Group in the Hydrolysis Reactions of Group 10 Organometallic Cations [(L)M(R)]+. Organometallics 2013. [DOI: 10.1021/om400358q] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Matthew J. Woolley
- School of Chemistry, The University of Melbourne, Victoria 3010, Australia
- ARC Centre of Excellence for Free
Radical Chemistry and Biotechnology, The University of Melbourne, Victoria 3010, Australia
- Bio21 Institute of Molecular Science
and Biotechnology, The University of Melbourne, Victoria 3010, Australia
| | - George N. Khairallah
- School of Chemistry, The University of Melbourne, Victoria 3010, Australia
- ARC Centre of Excellence for Free
Radical Chemistry and Biotechnology, The University of Melbourne, Victoria 3010, Australia
- Bio21 Institute of Molecular Science
and Biotechnology, The University of Melbourne, Victoria 3010, Australia
| | - Gabriel da Silva
- Department of Chemical and Biomolecular Engineering, The University of Melbourne, Victoria 3010, Australia
| | - Paul S. Donnelly
- School of Chemistry, The University of Melbourne, Victoria 3010, Australia
- Bio21 Institute of Molecular Science
and Biotechnology, The University of Melbourne, Victoria 3010, Australia
| | - Brian F. Yates
- School of Chemistry, University of Tasmania, Private Bag 75 Hobart, Tasmania 7001, Australia
| | - Richard A. J. O’Hair
- School of Chemistry, The University of Melbourne, Victoria 3010, Australia
- ARC Centre of Excellence for Free
Radical Chemistry and Biotechnology, The University of Melbourne, Victoria 3010, Australia
- Bio21 Institute of Molecular Science
and Biotechnology, The University of Melbourne, Victoria 3010, Australia
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Zhang Y, Blacque O, Venkatesan K. Highly Efficient Deep-Blue Emitters Based oncisandtransN-Heterocyclic Carbene PtIIAcetylide Complexes: Synthesis, Photophysical Properties, and Mechanistic Studies. Chemistry 2013; 19:15689-701. [DOI: 10.1002/chem.201302196] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2013] [Revised: 07/25/2013] [Indexed: 11/07/2022]
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Ortuño MA, Conejero S, Lledós A. True and masked three-coordinate T-shaped platinum(II) intermediates. Beilstein J Org Chem 2013; 9:1352-82. [PMID: 23946831 PMCID: PMC3740817 DOI: 10.3762/bjoc.9.153] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2013] [Accepted: 06/10/2013] [Indexed: 11/23/2022] Open
Abstract
Although four-coordinate square-planar geometries, with a formally 16-electron counting, are absolutely dominant in isolated Pt(II) complexes, three-coordinate, 14-electron Pt(II) complexes are believed to be key intermediates in a number of platinum-mediated organometallic transformations. Although very few authenticated three-coordinate Pt(II) complexes have been characterized, a much larger number of complexes can be described as operationally three-coordinate in a kinetic sense. In these compounds, which we have called masked T-shaped complexes, the fourth position is occupied by a very weak ligand (agostic bond, solvent molecule or counteranion), which can be easily displaced. This review summarizes the structural features of the true and masked T-shaped Pt(II) complexes reported so far and describes synthetic strategies employed for their formation. Moreover, recent experimental and theoretical reports are analyzed, which suggest the involvement of such intermediates in reaction mechanisms, particularly C-H bond-activation processes.
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Affiliation(s)
- Manuel A Ortuño
- Departament de Química, Universitat Autònoma de Barcelona, 08193 Cerdanyola del Vallès, Spain
| | - Salvador Conejero
- Instituto de Investigaciones Químicas (IIQ), Departamento de Química Inorgánica, CSIC and Universidad de Sevilla, Avda. Américo Vespucio 49, 41092 Sevilla, Spain
| | - Agustí Lledós
- Departament de Química, Universitat Autònoma de Barcelona, 08193 Cerdanyola del Vallès, Spain
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Zucca A, Cordeschi D, Maidich L, Pilo MI, Masolo E, Stoccoro S, Cinellu MA, Galli S. Rollover cyclometalation with 2-(2'-pyridyl)quinoline. Inorg Chem 2013; 52:7717-31. [PMID: 23768142 DOI: 10.1021/ic400908f] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
Rollover cyclometalation of 2-(2'-pyridyl)quinoline, L, allowed the synthesis of the family of complexes [Pt(L-H)(X)(L')] and [Pt(L*)(X)(L')][BF4] (X = Me, Cl; L' = neutral ligand), the former being the first examples of Pt(II) rollover complexes derived from the ligand L. The ligand L* is a C,N cyclometalated, N-protonated isomer of L, and can also be described as an abnormal-remote pyridylene. The corresponding [Pt(L-H)(Me)(L')]/[Pt(L*)(Me)(L')](+) complexes constitute an uncommon Brønsted-Lowry acid-base conjugated couple. The species obtained were investigated in depth through NMR and UV-vis spectroscopy, cyclic voltammetry, and density functional theory (DFT) methods to correlate different chemico-physical properties with the nature of the cyclometalated ligand (e.g., L vs bipy or L* vs L) and of the neutral ligand (DMSO, CO, PPh3). The crystal structures of [Pt(L-H)(Me)(PPh3)], [Pt(L-H)(Me)(CO)] and [Pt(L*)(Me)(CO)][BF4] were determined by X-ray powder diffraction methods, the latter being the first structure of a Pt(II)-based, protonated, rollover complex to be unraveled. The isomerization of [Pt(L*)(Me)(PPh3)](+) in solution proceeds through a retro-rollover process to give the corresponding adduct [Pt(L)(Me)(PPh3)](+), where L acts as a classical N,N chelating ligand. Notably, the retro-rollover reaction is the first process, among the plethora of Pt-C bond protonolysis reactions reported in the literature, where a Pt-C(heteroaryl) bond is cleaved rather than a Pt-C(alkyl) one.
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Affiliation(s)
- Antonio Zucca
- Dipartimento di Chimica e Farmacia, Università degli Studi di Sassari, via Vienna 2, 07100 Sassari, Italy.
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Gavriluta A, Büchel GE, Freitag L, Novitchi G, Tommasino JB, Jeanneau E, Kuhn PS, González L, Arion VB, Luneau D. Mechanism elucidation of the cis-trans isomerization of an azole ruthenium-nitrosyl complex and its osmium counterpart. Inorg Chem 2013; 52:6260-72. [PMID: 23675748 PMCID: PMC3673021 DOI: 10.1021/ic4004824] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2013] [Indexed: 11/29/2022]
Abstract
Synthesis and X-ray diffraction structures of cis and trans isomers of ruthenium and osmium metal complexes of general formulas (nBu4N)[cis-MCl4(NO)(Hind)], where M = Ru (1) and Os (3), and (nBu4N)[trans-MCl4(NO)(Hind)], where M = Ru (2) and Os (4) and Hind = 1H-indazole are reported. Interconversion between cis and trans isomers at high temperatures (80-130 °C) has been observed and studied by NMR spectroscopy. Kinetic data indicate that isomerizations correspond to reversible first order reactions. The rates of isomerization reactions even at 110 °C are very low with rate constants of 10(-5) s(-1) and 10(-6) s(-1) for ruthenium and osmium complexes, respectively, and the estimated rate constants of isomerization at room temperature are of ca. 10(-10) s(-1). The activation parameters, which have been obtained from fitting the reaction rates at different temperatures to the Eyring equation for ruthenium [ΔH(cis-trans)‡ = 122.8 ± 1.3; ΔH(trans-cis)‡ = 138.8 ± 1.0 kJ/mol; ΔS(cis-trans)‡ = -18.7 ± 3.6; ΔS(trans-cis)‡ = 31.8 ± 2.7 J/(mol·K)] and osmium [ΔH(cis-trans)‡ = 200.7 ± 0.7; ΔH(trans-cis)‡ = 168.2 ± 0.6 kJ/mol; ΔS(cis-trans)‡ = 142.7 ± 8.9; ΔS(trans-cis)‡ = 85.9 ± 3.9 J/(mol·K)] reflect the inertness of these systems. The entropy of activation for the osmium complexes is highly positive and suggests the dissociative mechanism of isomerization. In the case of ruthenium, the activation entropy for the cis to trans isomerization is negative [-18.6 J/(mol·K)], while being positive [31.0 J/(mol·K)] for the trans to cis conversion. The thermodynamic parameters for cis to trans isomerization of [RuCl4(NO)(Hind)]-, viz. ΔH° = 13.5 ± 1.5 kJ/mol and ΔS° = -5.2 ± 3.4 J/(mol·K) indicate the low difference between the energies of cis and trans isomers. The theoretical calculation has been carried out on isomerization of ruthenium complexes with DFT methods. The dissociative, associative, and intramolecular twist isomerization mechanisms have been considered. The value for the activation energy found for the dissociative mechanism is in good agreement with experimental activation enthalpy. Electrochemical investigation provides further evidence for higher reactivity of ruthenium complexes compared to that of osmium counterparts and shows that intramolecular electron transfer reactions do not affect the isomerization process. A dissociative mechanism of cis↔trans isomerization has been proposed for both ruthenium and osmium complexes.
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Affiliation(s)
- Anatolie Gavriluta
- Université Claude Bernard Lyon 1, Laboratoire des Multimatériaux et Interfaces (UMR 5615),
Campus de la Doua, 69622 Villeurbanne Cedex, France
- University of Vienna, Institute of Inorganic Chemistry, Währinger Strasse 42,
A-1090 Vienna, Austria
| | - Gabriel E. Büchel
- Université Claude Bernard Lyon 1, Laboratoire des Multimatériaux et Interfaces (UMR 5615),
Campus de la Doua, 69622 Villeurbanne Cedex, France
- University of Vienna, Institute of Inorganic Chemistry, Währinger Strasse 42,
A-1090 Vienna, Austria
| | - Leon Freitag
- University of Vienna, Institute of Theoretical Chemistry,
Währinger Strasse 17, A-1090 Vienna, Austria
| | - Ghenadie Novitchi
- Université Claude Bernard Lyon 1, Laboratoire des Multimatériaux et Interfaces (UMR 5615),
Campus de la Doua, 69622 Villeurbanne Cedex, France
- Laboratoire National des Champs Magnétiques
Intenses-CNRS, Université Joseph Fourier, 25 Avenue des Martyrs, 38042 Grenoble Cedex 9, France
| | - Jean Bernard Tommasino
- Université Claude Bernard Lyon 1, Laboratoire des Multimatériaux et Interfaces (UMR 5615),
Campus de la Doua, 69622 Villeurbanne Cedex, France
| | - Erwann Jeanneau
- Université Claude Bernard Lyon 1, Laboratoire des Multimatériaux et Interfaces (UMR 5615),
Campus de la Doua, 69622 Villeurbanne Cedex, France
| | - Paul-Steffen Kuhn
- University of Vienna, Institute of Inorganic Chemistry, Währinger Strasse 42,
A-1090 Vienna, Austria
| | - Leticia González
- University of Vienna, Institute of Theoretical Chemistry,
Währinger Strasse 17, A-1090 Vienna, Austria
| | - Vladimir B. Arion
- University of Vienna, Institute of Inorganic Chemistry, Währinger Strasse 42,
A-1090 Vienna, Austria
| | - Dominique Luneau
- Université Claude Bernard Lyon 1, Laboratoire des Multimatériaux et Interfaces (UMR 5615),
Campus de la Doua, 69622 Villeurbanne Cedex, France
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Cafeo G, Carbotti G, Cuzzola A, Fabbi M, Ferrini S, Kohnke FH, Papanikolaou G, Plutino MR, Rosano C, White AJP. Drug delivery with a calixpyrrole--trans-Pt(II) complex. J Am Chem Soc 2013; 135:2544-51. [PMID: 23350677 DOI: 10.1021/ja307791j] [Citation(s) in RCA: 51] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
A meso-p-nitroaniline-calix[4]pyrrole derivative trans-coordinated to a Pt(II) center was synthesized and its structure solved by X-ray analysis. Adenosine monophosphate (AMP) was used as a model compound to evaluate the potential for the assisted delivery of the metal to the DNA nucleobases via the phosphate anion-binding properties of the calix[4]pyrrole unit. An NMR investigation of the kinetics of AMP complexation in the absence of an H-bonding competing solvent (dry CD(3)CN) was consistent with this hypothesis, but we could not detect the interaction of the calix[4]pyrrole with phosphate in the presence of water. However, in vitro tests of the new trans-calixpyrrole-Pt(II) complex on different cancer cell lines indicate a cytotoxic activity that is unquestionably derived from the coexistence of both the trans-Pt(II) fragment and the calix[4]pyrrole unit.
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Affiliation(s)
- Grazia Cafeo
- Dipartimento di Scienze Chimiche, Università di Messina, viale F. Stagno D'Alcontres 31, 98166 Messina, Italy
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Zheng F, Hutton AT, van Sittert CGCE, Moss JR, Mapolie SF. Synthesis, structural characterization and cis–trans isomerization of novel (salicylaldiminato)platinum(ii) complexes. Dalton Trans 2013; 42:11163-79. [DOI: 10.1039/c3dt51283e] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Haghighi MG, Nabavizadeh SM, Rashidi M, Kubicki M. Selectivity in metal–carbon bond protonolysis in p-tolyl- (or methyl)-cycloplatinated(ii) complexes: kinetics and mechanism of the uncatalyzed isomerization of the resulting Pt(ii) products. Dalton Trans 2013; 42:13369-80. [DOI: 10.1039/c3dt51339d] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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Hildebrand A, Sárosi I, Lönnecke P, Silaghi-Dumitrescu L, Sárosi MB, Silaghi-Dumitrescu I, Hey-Hawkins E. Heteropolytopic Arsanylarylthiolato Ligands: Cis–Trans Isomerism of Nickel(II), Palladium(II), and Platinum(II) Complexes of 1-AsPh2-2-SHC6H4. Inorg Chem 2012; 51:7125-33. [DOI: 10.1021/ic300002p] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Alexandra Hildebrand
- Faculty of Chemistry
and Chemical Engineering, Babeş-Bolyai University, Kogalniceanu 1, RO-400084 Cluj-Napoca, Romania
- Institut für
Anorganische Chemie, Universität Leipzig, Johannisallee 29, D-04103 Leipzig, Germany
| | - Imola Sárosi
- Faculty of Chemistry
and Chemical Engineering, Babeş-Bolyai University, Kogalniceanu 1, RO-400084 Cluj-Napoca, Romania
- Institut für
Anorganische Chemie, Universität Leipzig, Johannisallee 29, D-04103 Leipzig, Germany
| | - Peter Lönnecke
- Institut für
Anorganische Chemie, Universität Leipzig, Johannisallee 29, D-04103 Leipzig, Germany
| | - Luminiţa Silaghi-Dumitrescu
- Faculty of Chemistry
and Chemical Engineering, Babeş-Bolyai University, Kogalniceanu 1, RO-400084 Cluj-Napoca, Romania
| | - Menyhárt B. Sárosi
- Faculty of Chemistry
and Chemical Engineering, Babeş-Bolyai University, Kogalniceanu 1, RO-400084 Cluj-Napoca, Romania
- Institut für
Anorganische Chemie, Universität Leipzig, Johannisallee 29, D-04103 Leipzig, Germany
| | - Ioan Silaghi-Dumitrescu
- Faculty of Chemistry
and Chemical Engineering, Babeş-Bolyai University, Kogalniceanu 1, RO-400084 Cluj-Napoca, Romania
| | - Evamarie Hey-Hawkins
- Institut für
Anorganische Chemie, Universität Leipzig, Johannisallee 29, D-04103 Leipzig, Germany
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Bonnington KJ, Zhang F, Moustafa MMAR, Cooper BFT, Jennings MC, Puddephatt RJ. Activation of Anisole by Organoplatinum(II) Complexes: Evidence for Rate-Determining C–H Activation. Organometallics 2011. [DOI: 10.1021/om200922a] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Kevin J. Bonnington
- Department
of Chemistry, University of Western Ontario, London, Canada N6A 5B7
| | - Fenbao Zhang
- Department
of Chemistry, University of Western Ontario, London, Canada N6A 5B7
| | | | | | - Michael C. Jennings
- Department
of Chemistry, University of Western Ontario, London, Canada N6A 5B7
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Braunschweig H, Bertermann R, Brenner P, Burzler M, Dewhurst RD, Radacki K, Seeler F. trans-[Pt(BCat′)Me(PCy3)2]: An Experimental Case Study of Reductive Elimination Processes in Pt-Boryls through Associative Mechanisms. Chemistry 2011; 17:11828-37. [DOI: 10.1002/chem.201101823] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2011] [Indexed: 11/10/2022]
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