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Rettig ID, Xu J, Knight EA, Truong PT, Bowring MA. Variable Kinetic Isotope Effect Reveals a Multistep Pathway for Protonolysis of a Pt–Me Bond. Organometallics 2022. [DOI: 10.1021/acs.organomet.2c00504] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Affiliation(s)
- Irving D. Rettig
- Department of Chemistry, Reed College, Portland, Oregon97202, United States
| | - Jingtong Xu
- Department of Chemistry, Reed College, Portland, Oregon97202, United States
| | | | - Phan T. Truong
- Department of Chemistry, Reed College, Portland, Oregon97202, United States
| | - Miriam A. Bowring
- Department of Chemistry, Reed College, Portland, Oregon97202, United States
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2
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Ho SKY, Lam FYT, de Aguirre A, Maseras F, White AJP, Britovsek GJP. Photolytic Activation of Late-Transition-Metal–Carbon Bonds and Their Reactivity toward Oxygen. Organometallics 2021. [DOI: 10.1021/acs.organomet.1c00487] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Sarah K. Y. Ho
- Department of Chemistry, Imperial College London, Molecular Sciences Research Hub, White City Campus, 80 Wood Lane, London W12 0BZ, United Kingdom
| | - Francis Y. T. Lam
- Department of Chemistry, Imperial College London, Molecular Sciences Research Hub, White City Campus, 80 Wood Lane, London W12 0BZ, United Kingdom
| | - Adiran de Aguirre
- Institute of Chemical Research of Catalonia, The Barcelona Institute for Science and Technology, Avgda. Països Catalans, 16, Tarragona 43007, Catalonia, Spain
| | - Feliu Maseras
- Institute of Chemical Research of Catalonia, The Barcelona Institute for Science and Technology, Avgda. Països Catalans, 16, Tarragona 43007, Catalonia, Spain
| | - Andrew J. P. White
- Department of Chemistry, Imperial College London, Molecular Sciences Research Hub, White City Campus, 80 Wood Lane, London W12 0BZ, United Kingdom
| | - George J. P. Britovsek
- Department of Chemistry, Imperial College London, Molecular Sciences Research Hub, White City Campus, 80 Wood Lane, London W12 0BZ, United Kingdom
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Liu H, Brewer CR, Walker AV, McElwee-White L. Photochemistry of 1,5-Cyclooctadiene Platinum Complexes for Photoassisted Chemical Vapor Deposition. Organometallics 2020. [DOI: 10.1021/acs.organomet.0c00616] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Hanwen Liu
- Department of Chemistry, University of Florida, Gainesville, Florida 32611-7200, United States
| | - Christopher R. Brewer
- Department of Chemistry, University of Florida, Gainesville, Florida 32611-7200, United States
| | - Amy V. Walker
- Department of Materials Science and Engineering, University of Texas at Dallas, 800 West Campbell Road, Richardson, Texas 75080, United States
- Department of Chemistry and Biochemistry, University of Texas at Dallas, Richardson, Texas 75080, United States
| | - Lisa McElwee-White
- Department of Chemistry, University of Florida, Gainesville, Florida 32611-7200, United States
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Neugebauer M, Schmitz S, Brünink D, Doltsinis NL, Klein A. Dynamics of the efficient cyclometalation of the undercoordinated organoplatinum complex [Pt(COD)(neoPh)] + (neoPh = 2-methyl-2-phenylpropyl). NEW J CHEM 2020. [DOI: 10.1039/d0nj04811a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
The cyclometalation reaction of [Pt(COD)(κ1-neoPh)]+ (neoPh = 2-methyl-2-phenylpropyl) to [Pt(COD)(κ2-neoPh)] was studied experimentally and mechanistically using DFT and MD simulations.
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Affiliation(s)
- Michael Neugebauer
- University of Cologne
- Department of Chemistry
- Institute for Inorganic Chemistry
- D-50939 Cologne
- Germany
| | - Simon Schmitz
- University of Cologne
- Department of Chemistry
- Institute for Inorganic Chemistry
- D-50939 Cologne
- Germany
| | - Dana Brünink
- Westfälische Wilhelms-Universität Münster
- Institut für Festkörpertheorie and Center for Multiscale Theory and Computation
- 48149 Münster
- Germany
| | - Nikos L. Doltsinis
- Westfälische Wilhelms-Universität Münster
- Institut für Festkörpertheorie and Center for Multiscale Theory and Computation
- 48149 Münster
- Germany
| | - Axel Klein
- University of Cologne
- Department of Chemistry
- Institute for Inorganic Chemistry
- D-50939 Cologne
- Germany
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5
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Neugebauer M, Schmitz S, Krause M, L. Doltsinis N, Klein A. Reactions of the organoplatinum complex [Pt(cod) (neoSi)Cl] (neoSi = trimethylsilylmethyl) with the non-coordinating anions SbF6– and BPh4–. OPEN CHEM 2018. [DOI: 10.1515/chem-2018-0130] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
AbstractReactions of the organoplatinum complex [Pt(cod)(neoSi)Cl] (neoSi = (trimethylsilylmethyl) with the Ag(I) salts of oxo or fluoride containing anions A– = NO3–, ClO4–, OTf – (trifluoromethanesulfonate) and SbF6– lead to the desired abstraction of the chlorido ligand and precipitation of AgCl. However, further reaction of the resulting Pt complexes [Pt(cod)(neoSi) (solvent)]+ with diverse N-heterocyclic ligands L such as pyridines, caffeine, and guanine did not yield the targeted complexes [Pt(cod)(neoSi)(L)](A) in most of the cases, but to extensive decomposition yielding [Pt(cod)(Me) (solvent)]+, thus transforming the neoSi into a methyl ligand. A detailed study on the reaction with SbF6– combining DFT calculations with NMR and MS revealed that Pt catalysed decomposition of SbF6‒ and fluorination of the neoSi silicon atom leading to FSiMe3. When reacting the parent complex with Ag(BPh4), the arylated derivative [Pt(cod)(neoSi)(Ph)] was obtained and characterised by multinuclear NMR, MS and single crystal XRD.
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Affiliation(s)
- Michael Neugebauer
- Universität zu Köln, Department für Chemie, Institut für Anorganische Chemie Greinstraße 6, D-50939Köln, Germany
| | - Simon Schmitz
- Universität zu Köln, Department für Chemie, Institut für Anorganische Chemie Greinstraße 6, D-50939Köln, Germany
| | - Maren Krause
- Universität zu Köln, Department für Chemie, Institut für Anorganische Chemie Greinstraße 6, D-50939Köln, Germany
| | - Nikos L. Doltsinis
- Westfälische Wilhelms-Universität Münster, Institut für Festkörpertheorie and Center for Multiscale Theory and Computation, Wilhelm-Klemm-Straße 10, 48149Münster, Germany
| | - Axel Klein
- Universität zu Köln, Department für Chemie, Institut für Anorganische Chemie Greinstraße 6, D-50939Köln, Germany
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Gonell S, Poyatos M, Peris E. Pincer-CNC mononuclear, dinuclear and heterodinuclear Au(III) and Pt(II) complexes supported by mono- and poly-N-heterocyclic carbenes: synthesis and photophysical properties. Dalton Trans 2016; 45:5549-56. [PMID: 26911885 DOI: 10.1039/c6dt00198j] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
A family of cyclometallated Au(iii) and Pt(ii) complexes containing a CNC-pincer ligand (CNC = 2,6-diphenylpyridine) supported by pyrene-based mono- or bis-NHC ligands have been synthesized and characterized, together with the preparation of a Pt-Au hetero-dimetallic complex based on a Y-shaped tris-NHC ligand. The photophysical properties of all the new species and of two related Ru(ii)-arene complexes were studied and compared. Whereas the pyrene-based complexes only exhibit emission in solution, those containing the Y-shaped tris-NHC ligand are only luminescent when dispersed in poly(methyl methacrylate) (PMMA). In particular, the pyrene-based complexes were found to be emissive in the range of 373-440 nm, with quantum yields ranging from 3.1 to 6.3%, and their emission spectra were found to be almost superimposable, pointing to the fluorescent pyrene-centered nature of the emission. This observation suggests that the emission properties of the pyrene fragment may be combined with some of the numerous applications of NHCs as supporting ligands allowing, for instance, the design of biological luminescent agents.
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Affiliation(s)
- S Gonell
- Institute of Advanced Materials (INAM), Universitat Jaume I, Av. Vicente Sos Baynat s/n, 12071-Castellón, Spain.
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Brendel M, Engelke R, Desai VG, Rominger F, Hofmann P. Synthesis and Reactivity of Platinum(II) cis-Dialkyl, cis-Alkyl Chloro, and cis-Alkyl Hydrido Bis-N-heterocyclic Carbene Chelate Complexes. Organometallics 2015. [DOI: 10.1021/acs.organomet.5b00204] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Matthias Brendel
- Organisch-Chemisches Institut, Ruprecht-Karls-Universität Heidelberg, Im Neuenheimer Feld 270, D-69120 Heidelberg, Germany
| | - René Engelke
- Organisch-Chemisches Institut, Ruprecht-Karls-Universität Heidelberg, Im Neuenheimer Feld 270, D-69120 Heidelberg, Germany
| | - Vidya G. Desai
- Organisch-Chemisches Institut, Ruprecht-Karls-Universität Heidelberg, Im Neuenheimer Feld 270, D-69120 Heidelberg, Germany
| | - Frank Rominger
- Organisch-Chemisches Institut, Ruprecht-Karls-Universität Heidelberg, Im Neuenheimer Feld 270, D-69120 Heidelberg, Germany
| | - Peter Hofmann
- Organisch-Chemisches Institut, Ruprecht-Karls-Universität Heidelberg, Im Neuenheimer Feld 270, D-69120 Heidelberg, Germany
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Lüning A, Neugebauer M, Lingen V, Krest A, Stirnat K, Deacon GB, Drago PR, Ott I, Schur J, Pantenburg I, Meyer G, Klein A. Platinum Diolefin Complexes - Synthesis, Structures, and Cytotoxicity. Eur J Inorg Chem 2014. [DOI: 10.1002/ejic.201402954] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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9
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Lüning A, Schur J, Hamel L, Ott I, Klein A. Strong Cytotoxicity of Organometallic Platinum Complexes with Alkynyl Ligands. Organometallics 2013. [DOI: 10.1021/om400293u] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Anna Lüning
- Department
für Chemie, Institut für Anorganische
Chemie, Universität zu Köln, Greinstraße 6, D-50939 Köln, Germany
| | - Julia Schur
- Institute
of Medicinal and Pharmaceutical Chemistry, Technische Universität Braunschweig, Beethovenstraße
55, D-38106 Braunschweig, Germany
| | - Laura Hamel
- Institute
of Medicinal and Pharmaceutical Chemistry, Technische Universität Braunschweig, Beethovenstraße
55, D-38106 Braunschweig, Germany
| | - Ingo Ott
- Institute
of Medicinal and Pharmaceutical Chemistry, Technische Universität Braunschweig, Beethovenstraße
55, D-38106 Braunschweig, Germany
| | - Axel Klein
- Department
für Chemie, Institut für Anorganische
Chemie, Universität zu Köln, Greinstraße 6, D-50939 Köln, Germany
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10
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Sivaramakrishna A, Clayton HS, Mogorosi MM, Moss JR. Hydrocarbon (π- and σ-) complexes of nickel, palladium and platinum: Synthesis, reactivity and applications. Coord Chem Rev 2010. [DOI: 10.1016/j.ccr.2010.05.021] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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11
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Klein A, Lüning A, Ott I, Hamel L, Neugebauer M, Butsch K, Lingen V, Heinrich F, Elmas S. Organometallic palladium and platinum complexes with strongly donating alkyl coligands – Synthesis, structures, chemical and cytotoxic properties. J Organomet Chem 2010. [DOI: 10.1016/j.jorganchem.2010.04.027] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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12
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Butsch K, Elmas S, Gupta NS, Gust R, Heinrich F, Klein A, von Mering Y, Neugebauer M, Ott I, Schäfer M, Scherer H, Schurr T. Organoplatinum(II) and -palladium(II) Complexes of Nucleobases and Their Derivatives. Organometallics 2009. [DOI: 10.1021/om900208r] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Katharina Butsch
- Institut für Anorganische Chemie, Department für Chemie, Universität zu Köln, Greinstrasse 6, D-50939 Köln, Germany
| | - Sait Elmas
- Institut für Anorganische Chemie, Department für Chemie, Universität zu Köln, Greinstrasse 6, D-50939 Köln, Germany
| | - Nalinava Sen Gupta
- Institut für Anorganische Chemie, Department für Chemie, Universität zu Köln, Greinstrasse 6, D-50939 Köln, Germany
| | - Ronald Gust
- Institut für Pharmazie, Pharmazeutische Chemie, Freie Universität Berlin, Königin-Luise-Strasse 2+4, D-14195 Berlin, Germany
| | - Frank Heinrich
- Institut für Anorganische Chemie, Department für Chemie, Universität zu Köln, Greinstrasse 6, D-50939 Köln, Germany
| | - Axel Klein
- Institut für Anorganische Chemie, Department für Chemie, Universität zu Köln, Greinstrasse 6, D-50939 Köln, Germany
| | - Yvonne von Mering
- Institut für Anorganische Chemie, Department für Chemie, Universität zu Köln, Greinstrasse 6, D-50939 Köln, Germany
| | - Michael Neugebauer
- Institut für Anorganische Chemie, Department für Chemie, Universität zu Köln, Greinstrasse 6, D-50939 Köln, Germany
| | - Ingo Ott
- Institut für Pharmazeutische Chemie, Technische Universität Braunschweig, Beethovenstrasse 55, D-38106 Braunschweig, Germany
| | - Mathias Schäfer
- Institut für Organische Chemie, Department für Chemie, Universität zu Köln, Greinstrasse 4, D-50939 Köln, Germany
| | - Harald Scherer
- Institut für Anorganische Chemie, Department für Chemie, Universität zu Köln, Greinstrasse 6, D-50939 Köln, Germany
| | - Thilo Schurr
- Institut für Anorganische Chemie, Department für Chemie, Universität zu Köln, Greinstrasse 6, D-50939 Köln, Germany
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Díez Á, Fernández J, Lalinde E, Moreno MT, Sánchez S. Complexes of platinum(ii) containing ferrocenylethynyl ligands: synthesis, characterization and spectroscopic and electrochemical properties. Dalton Trans 2008:4926-36. [DOI: 10.1039/b806572a] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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14
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Zhou X, Pan QJ, Li MX, Xia BH, Zhang HX. Theoretical studies on square-planar pincer platinum(II) complex and its SO2 adducts: SO2 detector and potential luminescent probe. ACTA ACUST UNITED AC 2007. [DOI: 10.1016/j.theochem.2007.07.021] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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15
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Zhou X, Pan QJ, Xia BH, Li MX, Zhang HX, Tung AC. DFT and TD-DFT Calculations on the Electronic Structures and Spectroscopic Properties of Cyclometalated Platinum(II) Complexes. J Phys Chem A 2007; 111:5465-72. [PMID: 17547374 DOI: 10.1021/jp064044r] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The electronic structures and spectroscopic properties of the three tridentate cyclometalated Pt(II) complexes Pt(N/\N/\C)C(triple bond)CPh (N/\N/\CH = 6-phenyl-2,2'-bipyridine) (1), Pt(N/\N/\S)C(triple bond)CPh (N/\N/\SH = 6-thienyl-2,2'-bipyridine) (2), and Pt(N/\N/\O)C(triple bond)CPh (N/\N/\OH = 6-furyl-2,2'-bipyridine) (3) were investigated theoretically using the density functional theory (DFT) method. The geometric structures of the complexes in the ground and excited states were explored at the B3LYP and UB3LYP levels, respectively. The absorption and emission spectra of the complexes in CH2Cl2 and CH3CN solutions were calculated by time-dependent density functional theory (TD-DFT) with the PCM solvent model. The calculated energies of the lowest singlet state and lowest triplet state in the three complexes are in good agreement with the results of experimental absorption and luminescence studies. All of the lowest-lying transitions were categorized as LLCT combined with MLCT transitions. The 623-nm emission of 1 from the 3A' --> 1A' transition was assigned as 3LLCT and 3MLCT transitions, whereas the 657- and 681-nm emissions of 2 and 3, respectively, were attributed to 3ILCT perturbed by 3MLCT transitions. NLO response calculations revealed that the nonzero values of the static first hyperpolarizability (beta0) for 1-3 are greatly enhanced through the introduction of the metal Pt(II) into the cyclometalated ligands, an effect that is determined by MLCT and LLCT transitions.
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Affiliation(s)
- Xin Zhou
- State Key Laboratory of Theoretical and Computational Chemistry, Institute of Theoretical Chemistry, and College of Chemistry, Jilin University, Changchun 130023, People's Republic of China
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Ozimiński WP, Garnuszek P, Bednarek E, Dobrowolski JC. The platinum complexes with histamine: Pt(II)(Hist)Cl2, Pt(II)(Iodo-Hist)Cl2 and Pt(IV)(Hist)2Cl2. Inorganica Chim Acta 2007. [DOI: 10.1016/j.ica.2006.10.004] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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17
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Hörner M, de Oliveira GM, de Oliveira JS, Teles WM, Filgueiras CAL, Beck J. Stabilization of the (η4-COD)Pt-fragment (COD=η2,η2-cyclo-octa-1,5-diene) by a bistriazenide: Synthesis and X-ray structural characterization of [(η4-COD)Pt(NNN-Ph)2C6H4], a neutral 1,2-bis(phenyltriazenido)benzene complex of platinum(II). J Organomet Chem 2006. [DOI: 10.1016/j.jorganchem.2005.09.018] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Zhou X, Zhang HX, Pan QJ, Xia BH, Tang AC. Theoretical Studies of the Spectroscopic Properties of [Pt(trpy)C⋮CR]+ (trpy = 2,2‘,6‘,2‘ ‘-Terpyridine; R = H, CH2OH, and C6H5). J Phys Chem A 2005; 109:8809-18. [PMID: 16834284 DOI: 10.1021/jp0503359] [Citation(s) in RCA: 100] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Electronic structures and spectroscopic properties of [Pt(trpy)C[triple bond]CR](+) (trpy = 2,2', 6',2' '-terpyridine; R = H (1), CH(2)OH (2), and C(6)H(5) (3) ) are studied by ab initio and DFT methods. The ground- and excited-state structures are optimized by the MP2 and CIS methods, respectively. The absorption and emission spectra in the dichloromethane solution are obtained by using TD-DFT (B3LYP) method associated with the PCM model. The calculations indicate that, for 1-3, the variation of the substituents on the acetylide ligand only slightly changes their structures in ground and excited states but leads to a sizable difference in the electronic structures. In both cases of absorption and emission, the energy levels of HOMOs for 1-3 are sensitive to the substituents on acetylide ligand and increase obviously with the introduction of the electron-donating groups; however, those of trpy-based LUMOs vary slightly. The lowest-energy emissions are attributed to triplet acetylide/Pt --> trpy charge transfer ((3)LLCT/(3)MLCT) transitions and the lowest-energy absorptions and emissions for 1-3 are red-shifted on the order of 1 < 2 < 3 when the electron-donating groups are introduced into the acetylide ligand. By comparison of the results obtained by using different functionals in TD-DFT method, the calculations indicate that the exchange-correlation functionals (B3LYP, B3P86 and B3PW91) involving Becke three parameter hybrid functionals are appropriate for the terpyridyl platinum(II) acetylide complexes to get the relatively satisfactory results for the absorption spectra. The underestimated excitation energies of lowest-lying absorption bands are probably due to insufficient flexibility in TD-DFT method to describe states with large charge transfer.
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Affiliation(s)
- Xin Zhou
- State Key Laboratory of Theoretical and Computational Chemistry, Institute of Theoretical Chemistry, Jilin University, Changchun 130023, People's Republic of China
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Thomson J, Slawin AM, Jain SL, Lobban J. The room temperature substitution of n- and iso-perfluoropropyl iodides and n-perfluorobutyl iodide to dimethylplatinum (II) 1,5-cyclooctadiene: The crystal structure of [Pt(C3F7)2(COD)]. INORG CHEM COMMUN 2005. [DOI: 10.1016/j.inoche.2005.05.022] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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20
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Klein A, Slageren J, Záliš S. Co-Ligand Involvement in Ground and Excited States of Electron-Rich (Polypyridyl)PtII Complexes. Eur J Inorg Chem 2003. [DOI: 10.1002/ejic.200200617] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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21
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Powell CE, Cifuentes MP, Morrall JP, Stranger R, Humphrey MG, Samoc M, Luther-Davies B, Heath GA. Organometallic complexes for nonlinear optics. 30.1 electrochromic linear and nonlinear optical properties of alkynylbis(diphosphine)ruthenium complexes. J Am Chem Soc 2003; 125:602-10. [PMID: 12517178 DOI: 10.1021/ja0277125] [Citation(s) in RCA: 180] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A combination of cyclic voltammetry, UV-vis-NIR spectroelectrochemistry, time-dependent density functional theory (TD-DFT), and Z-scan measurements employing a modified optically transparent thin-layer electrochemical (OTTLE) cell has been used to identify and assign intense transitions of metal alkynyl complexes at technologically important wavelengths in the oxidized state and to utilize these transitions to demonstrate a facile electrochromic switching of optical nonlinearity. Cyclic voltammetric data for the ruthenium(II) complexes trans-[RuXY(dppe)(2)] [dppe = 1,2-bis(diphenylphosphino)ethane, X = Cl, Y = Cl (1), Ctbd1;CPh (2), 4-Ctbd1;CC(6)H(4)Ctbd1;CPh (3); X = Ctbd1;CPh, Y = Ctbd1;CPh (4), 4-Ctbd1;CC(6)H(4)Ctbd1;CPh (5)] show a quasi-reversible oxidation at 0.50-0.60 V (with respect to ferrocene/ferrocenium 0.56 V), which is assigned to the Ru(II/III) couple. The ruthenium(III) complex cations trans-[RuXY(dppe)(2)](+) were obtained by the in situ oxidation of complexes 1-5 using an OTTLE cell. The UV-vis-NIR optical spectra of 1(+)-5(+) contain a low-energy band in the near-IR region ( approximately 8000-16 000 cm(-)(1)), in contrast to 1-5, which are optically transparent at wavelengths < 22 000 cm(-)(1). TD-DFT calculations have been applied to model systems trans-[RuXY(PH(3))(4)] [X = Cl, Y = Cl, Ctbd1;CPh, or 4-Ctbd1;CC(6)H(4)Ctbd1;CPh; X = Ctbd1;CPh, Y = Ctbd1;CPh or 4-Ctbd1;CC(6)H(4)Ctbd1;CPh] to rationalize the optical spectra of 1-5 and 1(+)-5(+). The important low-energy bands in the electronic spectra of 1(+)-5(+) are assigned to the promotion of an electron from either a chloride p orbital or an ethynyl p orbital to the partially occupied HOMO. These absorption bands have been utilized to demonstrate a facile switching of cubic nonlinear optical (NLO) properties at 12 500 cm(-)(1) (corresponding to the wavelength of maximum transmission in biological materials such as tissue) using the OTTLE cell, the first electrochromic switching of molecular nonlinear refraction and absorption, and the first switching of optical nonlinearity using an electrochemical cell.
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Affiliation(s)
- Clem E Powell
- Department of Chemistry, Australian National University, Canberra ACT 0200, Australia
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Klein A, van Slageren J, Zális S. Participation of co-ligands in electronic transitions of platinum(II) diazabutadiene complexes. Inorg Chem 2002; 41:5216-25. [PMID: 12354055 DOI: 10.1021/ic025547o] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The low-lying electronic transitions and photochemical reactions of a series of [((i)Pr-DAB)Pt(R)(2)] (where the co-ligand R = CH(3), CD(3), adme, neop, neoSi, C(triple bond)C(t)Bu, C(triple bond)CPh, Ph, Mes) compounds were studied using both experimental (electronic absorption and resonance Raman spectroscopy) and theoretical (density functional theory, DFT) techniques. The high-lying filled orbitals were revealed to have a significant co-ligand contribution in the case of alkyl complexes, while this contribution is predominant for the complexes with unsaturated co-ligands. Because the electronic transition removes electron density from the sigma(Pt-C) bond in the former complexes, it is best described as a metal-to-ligand charge transfer transition (MLCT) with partial sigma-bond-to-ligand charge transfer (SBLCT) character. Because the sigma(Pt-C) orbital is not involved in the HOMOs of the latter complexes, the low-lying transitions were characterized as mixed MLCT/L'LCT, where L'LCT stands for ligand-to-ligand charge transfer from the pi system of the unsaturated co-ligand to the pi((i)Pr-DAB) orbital. The alkyl complexes are photoreactive on visible light irradiation with Pt-C bond homolysis as the primary step. The efficiency of the photoreaction increases with increasing sigma donor strength of the alkyl ligand. The absolute quantum yield is quite low. The other complexes are virtually photostable, except when irradiated at relatively high energies.
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Affiliation(s)
- Axel Klein
- Institut für Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring 55, D-70569 Stuttgart, Germany.
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van Slageren J, Klein A, Záliš S. Ligand-to-ligand charge transfer states and photochemical bond homolysis in metalcarbon bonded platinum complexes. Coord Chem Rev 2002. [DOI: 10.1016/s0010-8545(02)00092-9] [Citation(s) in RCA: 55] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Jude H, Krause Bauer JA, Connick WB. Synthesis, structures, and emissive properties of platinum(II) complexes with a cyclometallating aryldiamine ligand. Inorg Chem 2002; 41:2275-81. [PMID: 11952385 DOI: 10.1021/ic0108991] [Citation(s) in RCA: 57] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A new series of square planar Pt(II) complexes with the mer-coordinating tridentate ligand, pip(2)NCN(-) (pip(2)NCNH = 1,3-bis(piperdylmethyl)benzene), has been prepared: Pt(pip(2)NCN)Cl (2), Pt(pip(2)NCN)Br (3), Pt(pip(2)NCN)I (4), and [Pt(pip(2)NCN)(CH(3)N=C(CH(3))(2))][CF(3)SO(3)] (5). The complexes have been fully characterized by (1)H NMR spectroscopy, elemental analysis, and UV-vis spectroscopy. The X-ray crystal structures of pip(2)NCNBr (1), 2, and 5 are reported. Compound 1: triclinic, P, a = 10.081(1) A, b = 10.153(2) A, c = 10.390(1) A, alpha = 66.05(1) degrees, beta = 79.07(1) degrees, gamma = 64.51(1) degrees, V = 877.1(2) A(3), Z = 2. Complex 2: triclinic, P, a = 9.897(2) A, b = 10.191(2) A, c = 19.174(4) A, alpha = 75.09(3) degrees, beta = 76.14(3) degrees, gamma = 71.00(3) degrees, V = 1741.2(6) A(3), Z = 4. Complex 5: triclinic, P, a = 10.709(2) A, b = 11.2321(10) A, c = 12.447(2) A, alpha = 110.509(8) degrees, beta = 112.417(10) degrees, gamma = 91.066(9) degrees, V = 1276.1(3) A(3), Z = 2. In 77 K 3:1 EtOH/MeOH glassy solution, these colorless complexes exhibit weak red-orange to red emissions originating from a lowest spin-forbidden ligand field excited state.
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Affiliation(s)
- Hershel Jude
- Department of Chemistry, University of Cincinnati, P.O. Box 210172, Cincinnati, Ohio 45221-0172, USA
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