Dissertations / Theses on the topic 'Trimethylphosphin'
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Parkin, G. "The chemistry of trimethylphosphine tungsten complexes." Thesis, University of Oxford, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.355780.
Full textClayton, C. W. "The synthesis and chemistry of some novel trimethylphosphine hydride complexes of iridium." Thesis, University of Oxford, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.379909.
Full textAlper, Fatma. "Synthesis And Characterization Of Tetracarbonylpyrazinetrimethylphosphitetungsten(0) Complexes." Master's thesis, METU, 2004. http://etd.lib.metu.edu.tr/upload/12605569/index.pdf.
Full textC. To test whether the introduction of a second pyrazine ligand might provide stability for the carbonyl-pyrazine-tungsten complex, W(CO)4(pyz)2 was attempted to be synthesized. The cis-W(CO)4(pyz)2 complex could be generated from the thermal substitution reaction of cis-W(CO)4(piperidine)2 with excess pyrazine in dichloromethane. However, this complex could not be isolated because of the lack of stability. The complex could only be identified by IR spectroscopy in solution. To stabilize the pentacarbonylpyrazinetungsten(0) complex, trimethylphosphite was introduced to the complex as a donor ligand. For this purpose, cis-W(CO)4[P(OCH3)3](thf), photogenerated from W(CO)5[P(OCH3)3] in tetrahydrofuran (thf), was reacted with pyrazine. The replacement of tetrahydrofuran with pyrazine (pyz) yielded cis-W(CO)4[P(OCH3)3](pyz). The complex could be isolated from the reaction solution and characterized by means of IR, 1H-, 13C-, 31P-NMR, and Mass spectroscopies. The introduction of P(OCH3)3 has proved that a donor ligand will strengthen the metal-pyrazine bond and thus stabilizes the complex. As a result of this stabilization, the complex could be isolated as the first example of tungsten pyrazine complexes that contain a donor ligand.
Boga, Dilek Ayse. "Synthesis And Characterization Of Pentacarbonylacryloylferrocenetungsten(0) Complex." Master's thesis, METU, 2006. http://etd.lib.metu.edu.tr/upload/12606968/index.pdf.
Full text#61544
2-acfc) complex as the sole monosubstitution product of the photolysis, as monitored by FT-IR spectroscopy. The product complex could be isolated from the reaction solution and characterized by IR, Raman, 1H-NMR, 13C-NMR spectroscopies, mass spectrometry and elemental analysis. The complex was found to be unstable in solution and to decompose to the parent W(CO)6 complex and free acryloylferrocene molecule. The instability of the complex makes its isolation as analytically pure substance difficult. In order to stabilize the tungsten-olefin bond, trimethylphosphite was introduced as a donor ligand into the molecule. Thus, a complex containing a donor ligand in addition to the olefinic ligand was prepared starting with W(CO)6, trimethylphosphite, and acryloylferrocene. UV irradiation of W(CO)5[P(OMe)3] with acryloylferrocene in n-hexane solution at room temperature generates W(CO)4[P(OMe)3](&
#61544
2-acfc), which was isolated from the reaction solution and characterized by IR, 1H-NMR, 13C-NMR spectroscopies and mass spectrometry. The complex was found to have a cis arrangement of four CO groups in the pseudo-octahedral geometry. However, the cis-W(CO)4[P(OMe)3](&
#61544
2-acfc) complex was found to be less stable than W(CO)5(&
#61544
2-acfc).
Rempe, Margaret Eileen. "Electron donor and acceptor properties of trimethylphosphine, triphenylphosphine, and related ligands with transition metals by photoelectron spectroscopy." Diss., The University of Arizona, 1994. http://hdl.handle.net/10150/186698.
Full textHabbadi, Nouzha. "Activation des petites molecules par les complexes du cobalt : reaction des complexes monovalents du cobalt et de la trimethylphosphine avec les alcynes vrais." Toulouse 3, 1986. http://www.theses.fr/1986TOU30073.
Full textMatthews, Kelly E. "Elucidation of the aqueous equilibrium system of IrH₂(PMe₃)₃Cl and periodic trends of the iridium (III) dihydrido tris(trimethylphosphino) series, IrH₂(PMe₃)₃X." Diss., This resource online, 1994. http://scholar.lib.vt.edu/theses/available/etd-06062008-164037/.
Full textAlnagi, Omar. "Reaction de la trimethylphosphine sur les sels de cobalt (ii) : synthese des complexes pentacoordonnes cox::(2)(pme::(3))::(3) (x=c1**(-), br**(-), i**(-), ncs**(-), no::(2)**(-)), reactivite vis-a-vis de petites molecules co, no et o::(2)." Toulouse 3, 1987. http://www.theses.fr/1987TOU30048.
Full textLEPETIT, POURCELOT CHRISTINE. "Mise au point de nouveaux catalyseurs de dimerisation du propylene a base de complexes supportes du nickel : controle de la stabilite et de la selectivite par effet de ligands : influence electronique sterique et mecanistique." Paris 6, 1987. http://www.theses.fr/1987PA066489.
Full textMenu, Marie-Joëlle. "Nouveaux reactifs dans la chimie des complexes du rhodium, du chrome et du tungstene : les anions diazo rc(n::(2))**(-)." Toulouse 3, 1988. http://www.theses.fr/1988TOU30068.
Full textMertzenich, Claude Larry. "Cyclodextrin inclusion complexes of tetramethyl-1,2-dioxetane and of tetrachlorotetrakis(Trimethylphosphine)-Dimolybdenum(II)." 1991. http://catalog.hathitrust.org/api/volumes/oclc/25680815.html.
Full textTypescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.
Karra, Murthy Dakshina. "Solid-state NMR studies of Bronsted acid sites in zeolites utilizing the probe molecule trimethylphosphine oxide." 2002. http://etda.libraries.psu.edu/theses/approved/WorldWideIndex/ETD-224/index.html.
Full textBennour, Hamdi. "Synthesis, Reactions and Properties of Iron, Cobalt and Nickel Complexes Containing some [P,S]-chelating Ligands and Trimethylphosphine." Phd thesis, 2010. http://tuprints.ulb.tu-darmstadt.de/2107/1/Synthesis_18.02.2010_with_CV.pdf.
Full textChen, Jeng-You, and 陳振友. "Acidity Characterization of Liquid Acids Using 31P NMR Chemical Shift and the Amount of Change by Trimethylphosphine Oxide." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/30653907952800837625.
Full text中原大學
化學研究所
104
Solvent acidity is one of the most important chemical properties of a molecule. Almost all chemical reactions will be affected by the solvent effect. Therefore, it is essential to use the spectroscopy technology to obtain the accurate and reproducible acidic character of a solvent. Based on Liu et. al. works in acidic aqueous solutions, we extended the acidity studies to solvent dimethylsulfoxide (DMSO) to obtain 31P chemical shifts of the trimethylphosphine oxide (TMPO) molecule in order to compare the pKa values of acid molecules derived in pH meter with solvents of water and DMSO respectively. In this study, the TMPO molecule was used as the acidic probe to act with the proton dissociated from the acidic molecule in DMSO. According to the ion atmosphere concept and the Coulomb attraction force, the electron cloud density will shift from the partially negative-charged oxygen site of TMPO to the dissolved proton of the acidic molecule. Therefore, the 31P chemical shift value of TMPO will move to the downfield position. The stronger the acidic strength, the more downfield will be the chemical shift. The experimental results demonstrated that 31P chemical shifts of TMPO molecules in acidic DMSO solutions can detect wider acid strength range from superacids to weak acids than traditional pH meter does. Comparing with results obtained in acidic aqueous solutions, acidic molecules dissolved in DMSO have better 31P chemical shift differentiation especially for weak acids or strong acids at low concentrations than in their aqueous solutions.
陳鈺芳. "Surface Characterization and Platelet Adhesion Studies of Plasma Polymerized of Trimethylphosphite, Triisopropylphosphite and Dimethylsulfate thin films." Thesis, 1997. http://ndltd.ncl.edu.tw/handle/59456364910175502884.
Full text國立成功大學
化學工程研究所
85
Plasma surface modification has been shown to modify the surface properties without altering the physical properties of teh substrates. Meanwhile, sev eral studies have indicated the blood interactions with the artificial surfaces were altered with the addition of phosphorus - containing functionalities on the surface. Henceforth, plasma surface modification using trimethylphosphite. Henceforth, plasma surface modification using trimethylphosphite ((CH3O)3P) or triisopropylphosphite ((CH3)2CHO)3P) as the monomer source were investigated with an aim to improve the blood compatbility of the substrate, cover glass. Various surface characterization techniques, such as ATR - FTIR, ESCA, SEM and contact angle measurement, were carried out to evaluate the surface properties of the films formed under different processing conditions (e. g. plasma pressure, RF power, treatmetn time duration, monomer mass flow rate etc.). ATR - FTR and ESCA results indicated phosphorus - containing functionalities, such as phosphate or phosphite, were formed at all plasma polymers studied. In addition, ESCA and SEM results have shown a smooth, continuous plasma polymerized thin film was formed at 400 mtorr, 20 watts and 20 minutes treatment conditions for trimethylphosphite, and at 250 mtorr, 20 watts and 10 minutes for triisopropylphosphite. Films formed at lower pressure, lower power, shorter treatment duration were discontinuous. The smooth plasma polymerized thin films were damaged while the RF power or treatment time was further increased than the optimum film formation condition. Contact angle measurement indicated the contact angle values of these thin films at the optimum film formation conditions were 6.3° and 8.5° for the plasma polymerized trimethylphosphite and plasma polymerized trissopropylphosphite, respectively. In vitro platelet adhesion studies showed less platelet adhesion, less platelet aggregation and less platelet activation on the thin films created at the optimum film formation conditions than on the cover glass control and others formed at different plasma processing conditions. Furthermore, plasma copolymerization of trissopropylphosphite and dimethylsulfate ( (CH3O)2SO2), suing cover glass as the substrate, was studied in order to incorporate both phosphorous - containgin and sulfur - contaning functionalities onto the thin film surface. An optimum film formation condition was found at 310 mtorr, 20 watts and 10 minutes plasma treatment duration while the mass flow rate of trisopropylphosphite was fixed at the rate which made the process pressure reading 250 mtorr initially. Contact angle value of this thin film is only 4.7°, which is more hydrophilic than the plasma polymerized triisopropylphosphite thin film. In yitro platelet adhesion studies have shown this plasma copolymerized thin film is more platelet compatible than either plasma polymerized triisopropylphosphite or trimethylphosphite thin films.
Bennour, Hamdi [Verfasser]. "Synthesis, reactions and properties of iron, cobalt and nickel complexes containing some (P,S)-chelating ligands and trimethylphosphine / vorgelegt von Hamdi Bennour." 2010. http://d-nb.info/1001484150/34.
Full textCamadanlı, Şebnem. "Cyclometalation and Bicyclometalation Reactions of Trimethylphosphine Supported Iron, Cobalt and Nickel Compounds via C-H Activation with Imine and Carbonyl Anchoring Groups." Phd thesis, 2005. http://tuprints.ulb.tu-darmstadt.de/603/1/Thesis_-_S_Camadanli.pdf.
Full textCamadanlı, Şebnem [Verfasser]. "Cyclometalation and bicyclometalation reactions of trimethylphosphine supported iron, cobalt and nickel compounds via C-H activation with imine and carbonyl anchoring groups / vorgelegt von Şebnem Camadanlı." 2005. http://d-nb.info/97631407X/34.
Full textKuo, Hsiao-Ching, and 郭小靖. "Multinuclear NMR Measurements for the Investigation of Solvent Characterization and Structural Difference between Acetone and Dimethyl Sulfoxide. / Solvent Effect on the Sensitivity of Liquid Acidity Characterization by Trimethylphosphine Oxide." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/79551741544785374064.
Full text中原大學
化學研究所
102
Liquid state NMR could be used for molecular-level analysis. There are two major topics in this thesis to study molecular structure and solvent effect mainly by multinuclear NMR experiments (17O and 31P), 1H diffusion experiments and viscosity measurements. The first topic is solvent characteristic analysis of dimethyl sulfoxide (DMSO) and acetone. The structures of DMSO and acetone is almost the same but center atom. It’s hard to explain the large difference of chemical and physical properties between DMSO and acetone. 1H and 13C of DMSO and acetone are similar but 17O is different (17O, DMSO：18.78 ppm;17O ,acetone：576.0 ppm). 17O of a series of common oxygen-content solvent show 17O is relative to the bond order and bond type. Therefore this study demonstrates the S-O bond of DMSO is not like usually saying as double bond but a single-like bond. The solvent characteristic analysis is studied by adding salts and mixing with water. The results show the activated side of DMSO is on oxygen. The S-O bond of large charge serapration could break H-bond network between water molecules and forms big cluster with water. That’s why DMSO could be a good cryoprotectant. The second topic is the study of how solvent effect affects sensitivity of liquid acidity characterization by measuring 31P NMR experiments of trimethylphosphine oxide (TMPO). The 31P measurement of TMPO provides a better method to meature acidity and overcomes many problem of traditional liquid acidity characterization. However there is still a major problem on solvent effect. Preparing acidic (H2SO4、HClO4、Acetic acid、Lactic acid) sample solution by choosing five common solvent (water, N-methyl-2-pyrrolidone (NMP), acetone, diethyl Carbonate (DEC), and acetonitrile) according to three solvent properties：(1) Protic or not ;(2) Polarity;(3) Donor number. In conclusion, the proper solvens of liquid acidity characterization by TMPO：for low concentration acidic solution is small donor number aprotic solvent (ex : acetone) ;for high concentration weak acidic solution is large donor number aprotic solvent (ex : NMP);for high concentration strong acidic solution is large donor number solvent (ex : H2O). The study provide a refrence to select proper solvent in liquid acidity characterization by TMPO.