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Xing B, Ge S, Zhao J, Yang H, Song J, Geng Y, Qiao Y, Gu L, Han P, Ma G. Alloyed Crystalline CdSe 1-xS x Semiconductive Nanomaterials - A Solid State 113Cd NMR Study. ChemistryOpen 2020; 9:1018-1026. [PMID: 33072471 PMCID: PMC7549000 DOI: 10.1002/open.202000216] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2020] [Revised: 09/03/2020] [Indexed: 01/14/2023] Open
Abstract
Solid‐state NMR analysis on wurtzite alloyed CdSe1−xSx crystalline nanoparticles and nanobelts provides evidence that the 113Cd NMR chemical shift is not affected by the varying sizes of nanoparticles, but is sensitive to the S/Se anion molar ratios. A linear correlation is observed between 113Cd NMR chemical shifts and the sulfur component for the alloyed CdSe1−xSx (0<x<1) system both in nanoparticles and nanobelts (δCd=169.71⋅XS+529.21). Based on this correlation, a rapid and applied approach has been developed to determine the composition of the alloyed nanoscalar materials utilizing 113Cd NMR spectroscopy. The observed results from this system confirm that one can use 113Cd NMR spectroscopy not only to determine the composition but also the phase separation of nanomaterial semiconductors without destruction of the sample structures. In addition, some observed correlations are discussed in detail.
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Affiliation(s)
- Baoyan Xing
- College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan, 030024, China.,Institute of Carbon Materials Science, Shanxi Datong University, Datong, 037009, China
| | - Sai Ge
- Institute of Carbon Materials Science, Shanxi Datong University, Datong, 037009, China
| | - Jianguo Zhao
- College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan, 030024, China.,Institute of Carbon Materials Science, Shanxi Datong University, Datong, 037009, China
| | - Hui Yang
- Institute of Carbon Materials Science, Shanxi Datong University, Datong, 037009, China
| | - Jie Song
- Institute of Carbon Materials Science, Shanxi Datong University, Datong, 037009, China
| | - Yu Geng
- Institute of Carbon Materials Science, Shanxi Datong University, Datong, 037009, China
| | - Yuying Qiao
- Institute of Carbon Materials Science, Shanxi Datong University, Datong, 037009, China
| | - Ling Gu
- Institute of Carbon Materials Science, Shanxi Datong University, Datong, 037009, China
| | - Peide Han
- College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan, 030024, China
| | - Guibin Ma
- Institute of Carbon Materials Science, Shanxi Datong University, Datong, 037009, China
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Fedotov MA. Applications of nuclear magnetic resonance to study the structure of platinum-group metal complexes in aqueous solutions. J STRUCT CHEM+ 2016. [DOI: 10.1134/s0022476616030203] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Torapava N, Elding LI, Mändar H, Roosalu K, Persson I. Structures of polynuclear complexes of palladium(ii) and platinum(ii) formed by slow hydrolysis in acidic aqueous solution. Dalton Trans 2013; 42:7755-60. [DOI: 10.1039/c3dt32859g] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Multinuclear magnetic resonance studies of the hydrolyzed and aquated species of the antitumor complexes cis-Pt(cyclobutylamine)2X2 and cis-Pt(NH3)(cyclobutylamine)X2 and antitumor testing of mixed-amine Pt(II) compounds. Inorganica Chim Acta 2009. [DOI: 10.1016/j.ica.2008.09.004] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Hofer TS, Randolf BR, Rode BM, Persson I. The hydrated platinum(ii) ion in aqueous solution—a combined theoretical and EXAFS spectroscopic study. Dalton Trans 2009:1512-5. [DOI: 10.1039/b819248k] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Jalilehvand F, Laffin LJ. Structure of the Hydrated Platinum(II) Ion and the cis-Diammineplatinum(II) Complex in Acidic Aqueous Solution: An EXAFS Study. Inorg Chem 2008; 47:3248-54. [DOI: 10.1021/ic7022538] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Farideh Jalilehvand
- Department of Chemistry, University of Calgary, Calgary, Alberta, Canada T2N 1N4
| | - Luke J. Laffin
- Department of Chemistry, University of Calgary, Calgary, Alberta, Canada T2N 1N4
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Gerber WJ, Murray P, Koch KR. 195Pt NMR isotopologue and isotopomer distributions of [PtCln(H2O)6 − n]4 − n (n = 6,5,4) species as a fingerprint for unambiguous assignment of isotopic stereoisomers. Dalton Trans 2008:4113-7. [DOI: 10.1039/b807831a] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Structure and dynamics of the hydrated palladium(II) ion in aqueous solution A QMCF MD simulation and EXAFS spectroscopic study. Chem Phys Lett 2007. [DOI: 10.1016/j.cplett.2007.08.009] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Abstract
This critical review highlights the progress in (195)Pt NMR over the last 25 years. In particular, some of the recent applications of (195)Pt NMR in catalytic and mechanistic studies, intermetallics and drug binding studies are discussed. (195)Pt NMR chemical shifts obtained from both theoretical studies and experiments are presented for Pt(0), Pt(II), Pt(III) and Pt(IV) complexes. (195)Pt coupling with various nuclei (viz. coupling constants) have also been collected in addition to data on (195)Pt relaxation. The latest developments in the theoretical knowledge and experimental advances have made (195)Pt NMR into a rich source of information in many fields. (164 references.).
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Affiliation(s)
- Brett M Still
- Nanoscale Organisation and Dynamics Group, College of Health and Science, University of Western Sydney, Penrith South DC, NSW 1797, Australia
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Kramer J, Koch KR. 195Pt NMR Study of the Speciation and Preferential Extraction of Pt(IV)−Mixed Halide Complexes by Diethylenetriamine-Modified Silica-Based Anion Exchangers. Inorg Chem 2006; 45:7843-55. [PMID: 16961377 DOI: 10.1021/ic0609655] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A detailed 195Pt NMR study of the distribution of Pt(IV) complex species resulting from the aquation of H2PtCl6, H2PtBr6, and mixtures of H2PtCl6/H2PtBr6 in water/dilute HClO4 has been carried out to obtain an understanding of the speciation in these solutions as relevant to the recovery of Pt(IV) complexes from process solutions. A species distribution plot of the [PtCl6]2-, [PtCl5(H2O)]-, and [PtCl4(H2O)2] shows that in equilibrated, relatively concentrated H2PtCl6 solutions ([Pt]t > 0.12 M), the [PtCl4(H2O)2] species is below the 195Pt NMR detection limit; for [Pt]t concentrations < 0.1 M, the relative concentrations of the [PtCl5(H2O)]- and [PtCl4(H2O)2] species increase significantly, as a result of relatively rapid aquation of the [PtCl6]2- and [PtCl5(H2O)]- complexes under these conditions. From this (195)Pt NMR data the aquation constants of [PtCl6]2- and [PtBr6]2- of log K6 approximately 1.75 +/- 0.05 and log K6 approximately 2.71 +/- 0.15, respectively, have been determined at 30 degrees C. In mixtures of H2PtCl6/H2PtBr6 in water, a number of previously unidentified aquated complexes of the general formula [PtCl(5-n)Br(n)(H2O)]- (n = 0-5) could be identified, including the possible geometrical isomers of these complexes. These 195Pt NMR assignments were confirmed by remarkably systematic, linear relationships between the 195Pt chemical shift increments induced by substitution of Cl- ions by n Br- ions in [PtCl(6-n)Br(n)]2- and [PtCl(5-n)Br(n)(H2O)]- complexes. Preferential extraction of the [PtX6]2- (X = Cl, Br, or a mixture of the two halides) species over their corresponding aquated [PtX5(H2O)]- counterparts by silica-based diethylenetriamine anion exchangers could be demonstrated by means of 195Pt NMR spectroscopy.
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Affiliation(s)
- Jurjen Kramer
- Department of Chemistry and Polymer Science, University of Stellenbosch, Private Bag X1, Matieland, 7602 Stellenbosch, South Africa
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Sengupta PS. The water exchange process of tetraaquaplatinum(II): Density-functional theory and ab initio computational study. J Chem Phys 2006; 124:74511. [PMID: 16497061 DOI: 10.1063/1.2167643] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
The water exchange process of square planar tetraaquaplatinum(II) was computationally investigated at the Hartree-Fock, density-functional theory (B3LYP, PW91PW91, and mPW1PW91) and the second-order Moller-Plesset perturbation theory of levels of calculation. The stationary points on the gas phase and on the reaction field potential-energy surface were fully optimized and characterized. The self-consistent reaction field (SCRF) methods were also applied on the same system. The structures and energetic processes of all the species involved were investigated. The kinetic and thermodynamic properties for the gas phase and SCRF model data were compared with the available experimental data. The rate constants in MP2 level of theory and B3LYP isodensity polarized continuum model reaction field are in good agreement with the experimental data.
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Purans J, Fourest B, Cannes C, Sladkov V, David F, Venault L, Lecomte M. Structural Investigation of Pd(II) in Concentrated Nitric and Perchloric Acid Solutions by XAFS. J Phys Chem B 2005; 109:11074-82. [PMID: 16852349 DOI: 10.1021/jp045489n] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
XAFS spectra of palladium(II) in concentrated HNO3/HClO4 acid mixtures have been recorded and analyzed. Structural parameters of the Pd(H2O)4(2+) complex and the mixed nitric Pd(NO3)2(H2O)2 complex, for the first time, were determined by the XAFS method. For pure 5 M HClO4 and for mixtures (0-0.3 M HNO3), the XAFS spectra of the 0.02 M Pd solutions are indeed very similar and originated from four Pd-O(w) equivalent distances. For the Pd(H2O)4(2+) square-planar aqua ion in strong perchloric acid, the use of an FEFF6 theoretical approach led to a first-shell Pd-O(w) distance of 2.00 (1) A and a Debye-Waller (DW) factor of sigma2 = 0.0030 (3) A2. Four water molecules are tightly bound to the Pd2+ ion in the equatorial plane, while two (or one) axial water molecules are weakly bound to the metal ion at 2.5 A with a DW factor of 0.015 (5) A2. For highly concentrated mixtures (4-6 M HNO3) and for pure concentrated (4-6 M) nitric acid as well as for crystalline powder Pd(NO3)2(H2O)2, the XAFS spectra are very similar and are determined by the mixed nitric complex Pd(NO3)2(H2O)2: four Pd-O near-equivalent distances of 2.01 (1) A from two H2O and two NO3 molecules with a total DW factor of sigma2 = 0.0037 (3) A2. Moreover, two Pd---N distances of 2.8-2.9 A were determined in the second coordination shell. Finally, for intermediate mixtures (1-3 M HNO3 in 5 M HClO4), the XAFS spectra are a superposition of the XAFS of Pd(H2O)4(2+) and Pd(NO3)2(H2O)2 complexes. The mean ligand number NO3(-) around Pd2+ has been calculated, and the XAFS results at pH close to zero confirm the spectrophotometric results previously published.
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Affiliation(s)
- J Purans
- Institut de Physique Nucléaire, 91406 Orsay Cedex, France.
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Martínez JM, Torrico F, Pappalardo RR, Sánchez Marcos E. Understanding the Hydration Structure of Square-Planar Aquaions: The [Pd(H2O)4]2+ Case. J Phys Chem B 2004. [DOI: 10.1021/jp049119a] [Citation(s) in RCA: 53] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- José M. Martínez
- Departamento de Quimica Fısica, Universidad de Sevilla, 41012-Sevilla, Spain
| | - Francisco Torrico
- Departamento de Quimica Fısica, Universidad de Sevilla, 41012-Sevilla, Spain
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Siegel R, Nakashima TT, Wasylishen RE. Application of Multiple-Pulse Experiments to Characterize Broad NMR Chemical-Shift Powder Patterns from Spin-1/2 Nuclei in the Solid State. J Phys Chem B 2004. [DOI: 10.1021/jp031048c] [Citation(s) in RCA: 63] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Renée Siegel
- Department of Chemistry, Gunning/Lemieux Chemistry Centre, University of Alberta, Edmonton, Alberta, Canada T6G 2G2
| | - Thomas T. Nakashima
- Department of Chemistry, Gunning/Lemieux Chemistry Centre, University of Alberta, Edmonton, Alberta, Canada T6G 2G2
| | - Roderick E. Wasylishen
- Department of Chemistry, Gunning/Lemieux Chemistry Centre, University of Alberta, Edmonton, Alberta, Canada T6G 2G2
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Bossio RE, Hoffman NW, Cundari TR, Marshall AG. Gas-Phase Ligand Exchange in a Square-Planar Rhodium(I) Complex Proceeding by Dissociative Exchange: ESI FT-ICR MS and DFT Evidence. Organometallics 2003. [DOI: 10.1021/om0306473] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Robert E. Bossio
- Ion Cyclotron Resonance Program, National High Magnetic Field Laboratory, Florida State University, 1800 East Paul Dirac Drive, Tallahassee, Florida 32310-4005
| | - Norris W. Hoffman
- Ion Cyclotron Resonance Program, National High Magnetic Field Laboratory, Florida State University, 1800 East Paul Dirac Drive, Tallahassee, Florida 32310-4005
| | - Thomas R. Cundari
- Ion Cyclotron Resonance Program, National High Magnetic Field Laboratory, Florida State University, 1800 East Paul Dirac Drive, Tallahassee, Florida 32310-4005
| | - Alan G. Marshall
- Ion Cyclotron Resonance Program, National High Magnetic Field Laboratory, Florida State University, 1800 East Paul Dirac Drive, Tallahassee, Florida 32310-4005
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McInnes CS, Clare BR, Redmond WR, Clark CR, Blackman AG. The nature of the [Pt(bipy)2]2+ion in aqueous alkaline solution: a new look at an old problem. Dalton Trans 2003. [DOI: 10.1039/b302854b] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Naidoo KJ, Klatt G, Koch KR, Robinson DJ. Geometric hydration shells for anionic platinum group metal chloro complexes. Inorg Chem 2002; 41:1845-9. [PMID: 11925178 DOI: 10.1021/ic010719n] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Solvation shells surrounding complex inorganic anions have not been extensively studied and are often mentioned with an amorphous picture in mind. We use a computational model previously validated against experimental results and ab initio quantum calculations (Lienke, A.; Klatt, G.; Robinson, D.; Koch, K. R.; Naidoo, K. J. Inorg.Chem. 2001, 40, 2352-2357) to investigate the nature of the hydration shells about simple platinum group metal chloro complexes ([PtCl(6)](2-), [RhCl(6)](3-), [PtCl(4)](2-), and [PdCl(4)](2-)). Our simulations show that the hydration shells surrounding these complexes are symmetric and take on familiar geometric forms. We find that only the [RhCl(6)](3-) complex has a clearly defined second hydration shell while the [PtCl(6)](2-), [PtCl(4)](2-), and [PdCl(4)](2-) second hydration shells are more diffuse.
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Affiliation(s)
- Kevin J Naidoo
- Departments of Chemistry, University of Cape Town, Rondebosch 7701, South Africa.
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Tsipis AC, Sigalas MP. Mechanistic aspects of the complete set of hydrolysis and anation reactions of cis - and trans -DDP related to their antitumor activity modeled by an improved ASED-MO approach. ACTA ACUST UNITED AC 2002. [DOI: 10.1016/s0166-1280(02)00007-6] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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OKEYA S, WAKAMATSU K, SHIBAHARA T, YAMAKADO H, NISHIMOTO K. Theoretical Study for the Site Exchange Mechanism of Anionic 5-Coordinate Pt(II) Complexes with Halide, [PtX(hfac)2]- (X=Cl,Br,I, hfac=hexafluoroacetylacetonate). JOURNAL OF COMPUTER CHEMISTRY-JAPAN 2002. [DOI: 10.2477/jccj.1.97] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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A nuclear magnetic resonance investigation of water exchange reactions and trans to cis isomerization for diaqua and dihydroxobis(oxalato) and bis(malonato)platinum(IV) complexes. Inorganica Chim Acta 2000. [DOI: 10.1016/s0020-1693(99)00340-0] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Palladium (II) and platinum (II) aqueous solutions. Evidence for the solvation of the [PdCl4]2− and [PtCl4]2− ions. J Mol Liq 1998. [DOI: 10.1016/s0167-7322(98)82003-5] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Romeo R, Plutino MR, Elding LI. Protonolysis of Dialkyl- and Alkylarylplatinum(II) Complexes and Geometrical Isomerization of the Derived Monoorgano-Solvento Complexes: Clear-Cut Examples of Associative and Dissociative Pathways in Platinum(II) Chemistry. Inorg Chem 1997; 36:5909-5916. [PMID: 11670214 DOI: 10.1021/ic9704905] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Protonolysis of the complexes cis-[PtR(2)(PEt(3))(2)] (R = Me, Et, Pr(n)(), Bu(n)(), CH(2)C(Me)(3), CH(2)Si(Me)(3)) and cis-[Pt(R)(R')(PEt(3))(2)] (R = Ph, 2-MeC(6)H(4), 2,4,6-Me(3)C(6)H(2); R' = Me) in methanol selectively cleaves one alkyl group, yielding cis-[Pt(R)(PEt(3))(2)(MeOH)](+) and alkanes. The reactions occur as single-stage conversions from the substrate to the product. There is no evidence by UV and by low-temperature (1)H and (31)P NMR spectroscopy for the presence of significant amounts of Pt(II) or Pt(IV) intermediate species. Reactions are first order with respect to complex and proton concentrations and are strongly retarded by steric congestion at the Pt-C bond, varying from k(2) = (2.65 +/- 0.08) x 10(5) M(-)(1) s(-)(1) for R = R' = Et to k(2) = 9.80 +/- 0.44 M(-)(1)s(-)(1) for R = R'= CH(2)Si(Me)(3). Low enthalpies of activation and largely negative volumes of activation are associated with the process. The mechanism involves a rate-determining proton transfer either to the metal-carbon sigma bond (S(E)2 mechanism) or to the metal center (S(E)(oxidative) mechanism), followed by fast extrusion of the alkane and simultaneous blocking of the vacant coordination site by the solvent to generate cis-[Pt(R)(PEt(3))(2)(MeOH)](+) species. The subsequent slower process, cis to trans isomerization of cis-[Pt(R)(PEt(3))(2)(MeOH)](+), is characterized by high values of enthalpies of activation, positive entropies of activation, and largely positive volumes of activation. The reaction is shown to proceed through the dissociative loss of the weakly bonded molecule of solvent and the interconversion of two geometrically distinct T-shaped 14-electron 3-coordinate intermediates. The presence of beta-hydrogens on the residual alkyl chain produces a great acceleration of the rate (R = Me, k(i) = 0.0026 s(-)(1); R = Et, k(i) = 44.9 s(-)(1)) as a consequence of the stabilization of the 3-coordinate [Pt(R)(PEt(3))(2)](+) transition state through an incipient agostic interaction. The results of this work, together with those of a previous paper, give a rationale of the "elusive" nature of these compounds. The following factors concur: (i) electron release by the phosphine ligands, (ii) steric repulsion and distortion of the square-planar configuration, and (iii) interaction of the metal with beta-hydrogens.
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Affiliation(s)
- Raffaello Romeo
- Dipartimento di Chimica Inorganica, Chimica Analitica e Chimica Fisica and Istituto di Chimica e Tecnologia dei Prodotti Naturali (ICTPN-CNR), Sezione di Messina, Università di Messina, Salita Sperone 31, Vill. S. Agata, 98100 Messina, Italy, and Inorganic Chemistry 1, Chemical Center, Lund University, P.O. Box 124, S 22100 Lund, Sweden
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Deeth RJ. Transition state symmetries and theoretical activation enthalpies for chloride exchange at planar [PdCl4]2−. Chem Phys Lett 1996. [DOI: 10.1016/0009-2614(96)00875-5] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Deeth RJ, Elding LI. Theoretical Modeling of Water Exchange on [Pd(H(2)O)(4)](2+), [Pt(H(2)O)(4)](2+), and trans-[PtCl(2)(H(2)O)(2)]. Inorg Chem 1996; 35:5019-5026. [PMID: 11666709 DOI: 10.1021/ic950335v] [Citation(s) in RCA: 111] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Density functional theory is applied to modeling the exchange in aqueous solution of H(2)O on [Pd(H(2)O)(4)](2+), [Pt(H(2)O)(4)](2+), and trans-[PtCl(2)(H(2)O)(2)]. Optimized structures for the starting molecules are reported together with trigonal bipyramidal (tbp) systems relevant to an associative mechanism. While a rigorous tbp geometry cannot by symmetry be the actual transition state, it appears that the energy differences between model tbp structures and the actual transition states are small. Ground state geometries calculated via the local density approximation (LDA) for [Pd(H(2)O)(4)](2+) and relativistically corrected LDA for the Pt complexes are in good agreement with available experimental data. Nonlocal gradient corrections to the LDA lead to relatively inferior structures. The computed structures for analogous Pd and Pt species are very similar. The equatorial M-OH(2) bonds of all the LDA-optimized tbp structures are predicted to expand by 0.25-0.30 Å, while the axial bonds change little relative to the planar precursors. This bond stretching in the transition state counteracts the decrease in partial molar volume caused by coordination of the entering water molecule and can explain qualitatively the small and closely similar volumes of activation observed. The relatively higher activation enthalpies of the Pt species can be traced to the relativistic correction of the total energies while the absolute DeltaH() values for exchange on [Pd(H(2)O)(4)](2+) and [Pt(H(2)O)(4)](2+) are reproduced using relativistically corrected LDA energies and a simple Born model for hydration. The validity of the latter is confirmed via some simple atomistic molecular mechanics estimates of the relative hydration enthalpies of [Pd(H(2)O)(4)](2+) and [Pd(H(2)O)(5)](2+). The computed DeltaH() values are 57, 92, and 103 kJ/mol compared to experimental values of 50(2), 90(2), and 100(2) kJ/mol for [Pd(H(2)O)(4)](2+), [Pt(H(2)O)(4)](2+), and trans-[PtCl(2)(H(2)O)(2)], respectively. The calculated activation enthalpy for a hypothetical dissociative water exchange at [Pd(H(2)O)(4)](2+) is 199 kJ/mol. A qualitative analysis of the modeling procedure, the relative hydration enthalpies, and the zero-point and finite temperature corrections yields an estimated uncertainty for the theoretical activation enthalpies of about 15 kJ/mol.
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Affiliation(s)
- Robert J. Deeth
- Inorganic Computational Chemistry Group, Department of Chemistry, University of Warwick, Coventry CV4 7AL, U.K., and Inorganic Chemistry 1, Chemical Center, Lund University, P.O. Box 124, S-221 00 Lund, Sweden
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Watabe M, Takayama T, Kuwahara A, Kawahashi T, Koike Y, Horiuchi A, Suzuki M, Watanabe T, Mikami K, Matsumoto T, Narusawa Y. Preparations and13C and195Pt NMR Spectra of Platinum(II) Peptide Complexes and Their Growth-Inhibitory Activity against Mouse Meth A Solid Tumor in Vivo. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 1995. [DOI: 10.1246/bcsj.68.2559] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Solvolysis of palladium(II) and platinum(II) complexes of asymmetric ligands: Synthesis and structural characterization of [Pd(AMP)(dmso)Cl]BF4 and [Pt(AMP)(dmso)Cl]ClO4. TRANSIT METAL CHEM 1992. [DOI: 10.1007/bf02910763] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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