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Dissertations / Theses on the topic 'Tungsten carbonyl complexes'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

Wang, I.-Hsiung 1950. "Kinetics Studies of Substituted Tungsten Carbonyl Complexes." Thesis, University of North Texas, 1989. https://digital.library.unt.edu/ark:/67531/metadc330797/.

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Thermal reactions and flash photolysis are used to study the olefin bond-migration promoted by tungsten carbonyls. Substitution of piperidine (pip) by 2- allylphenyldiphenylphosphine (adpp) in the cis-(pip)(η^1- adpp)W(CO)-4 complex was investigated, and no olefin bond-migration was observed. This suggests that a vacant coordinated site adjacent to the coordinated olefin is an essential requirement for olefin bond rearrangement. The rates of olefin attack on the photogenerated coordinatively unsaturated species, cis-[(CB)(η^1-ol- P)W(CO)-4] (CB = chlorobenzene, p-ol = Ph-2P(CH-2)-3CH=CH-2; n

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2

Walker, Daniel James. "Fluorinations of tungsten and molybdenum carbonyl complexes." Thesis, University of Leicester, 1997. http://hdl.handle.net/2381/30011.

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The dimeric complexes (n5-C5H5)M(CO)3 2 (where M = W or Mo) and (H3C{ti5-C5H4})Mo(CO)3 2 have been treated with XeF2 in organic solvents. All three materials react to form air sensitive products which solid-phase IR studies show to contain highly oxidised metal carbonyl components. The product from the fluoridation of (H3C{T 5-C5H5})Mo(CO)3 2 is insufficiently stable in solution for it to be characterised further. 19F NMR studies show that (n5-C5H5)W(CO)3 2 reacts to form the new complex (T 5-C5H5)WF5, but that the molybdenum analogue reacts to form an unidentified product which, although it p

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3

Reinisch, Paul Frederick. "The chemistry of dinuclear complexes of tungsten containing phosphido ligands." Thesis, University of Cambridge, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.304513.

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4

Kavakli, Cuneyt. "Synthesis And Characterization Of Carbonyl - Tungsten(0) Complexes Of [n,n&#039." Master's thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/12606101/index.pdf.

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In this study a bidentate ligand containing two ferrocenyl moieties, N,N&#039<br>-bis(ferrocenylmethylene)ethylenediamine, was prepared by condensation reaction of ferrocenecarboxyaldehyde and ethylenediamine on refluxing in benzene. The molecule was identified by IR, Raman, UV-VIS, 1H-, 13C-NMR spectroscopies. Then, this bidentate ligand was reacted with pentacarbonylbis-(trimethyl)silylethyne)tungsten(0). The ligand substitution reaction in dichloromethane yielded the new complex, tetracarbonyl [N,N&#039<br>-bis(ferrocenylmethylene)ethylenediamine]tungsten(0) (W(CO)4(BFEDA)). This new com

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5

Zhang, Shulin. "Studies of Solvent Displacement from Solvated Metal Carbonyl Complexes of Chromium, Molybdenum, and Tungsten." Thesis, University of North Texas, 1990. https://digital.library.unt.edu/ark:/67531/metadc331992/.

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Flash photolysis techniques were applied to studies of solvent displacement by Lewis bases (L) from solvated metal carbonyl complexes of Cr, Mo, and W. On the basis of extensive studies of the reaction rate laws, activation parameters , and linear-free-energy-relationships, it was concluded that the mechanisms of solvent displacement reactions depend on the electronic and steric properties of the solvents and L, as well as the identities of the metal atoms. The strengths of solvent-metal bonding interactions, varying from ca. 7 to 16 kcal/mol, and the bonding "modes" of solvents to metals are

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6

Hirsivaara, L. (Leeni). "Coordination chemistry of arylphosphanes:binding and interligand interactions in chromium, molybdenum and tungsten carbonyl complexes." Doctoral thesis, University of Oulu, 2001. http://urn.fi/urn:isbn:9514259866.

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Abstract The first part of this work consisted of a study of the coordination chemistry of aromatic (P,S) and (P,O) heterodonor phosphanes with Cr(CO) 6 , Mo(CO) 6 and W(CO) 6 . The (P,S) donor ligands having one or two o -thiomethoxyphenyl groups, preferred bidentate coordination mode, while the (P,O) donor ligands, having one, two or three o -methoxyphenyls, formed monodentate phosphorus bound complexes. Steric and electronic parameters affecting the coordination chemistry of the phosphanes are discussed for the monodentate complexes. In the second part, triphenylphosphane and 2- and 4

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7

Aspley, Catherine J. "Synthesis and photophysics of porphryins linked to metal carbonyl units." Thesis, University of York, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.367465.

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8

Alper, Fatma. "Synthesis And Characterization Of Tetracarbonylpyrazinetrimethylphosphitetungsten(0) Complexes." Master's thesis, METU, 2004. http://etd.lib.metu.edu.tr/upload/12605569/index.pdf.

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In this study, the effect of a donor ligand on the stabilization of a carbonyl pyrazine tungsten complex was studied. The pentacarbonylpyrazinetungsten(0) complex could be formed from the photolysis of hexacarbonyltungsten(0) in the presence of pyrazine and could be isolated as crystalline solid. However, the complex was found to be unstable in solution, being converted to a bimetallic complex, (CO)5W(pyz)W(CO)5 and free pyrazine molecule. Two complexes exist in solution at equilibrium. The equilibrium constant could be determined by 1H-NMR spectroscopy and found to be 0.0396 at 25&deg<br>C. T

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9

0gweno, Aloice 0. "Synthesis, characterization and catalytic application of carbonyl complexes of molybdenum and tungsten in epoxidation of some alkenes." University of the Western Cape, 2010. http://hdl.handle.net/11394/8214.

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>Magister Scientiae - MSc<br>In this thesis we describe the synthesis of several carbonyl complexes of molybdenum and tungsten, compounds (Cl-ClO). The compounds Cl- C4 are zero valent carbonyl complexes containing N-base ligands prepared by following a common synthetic procedure. Compounds Cl and C2 were metal pentacarbonyl of 3-(1-methylpyrrolidin-2-yl) pyridine while C3 and C4 are metal tetracarbonyl complexes of 3, 5- dimethylpyrazole, (M=Mo, W). The compounds C5-C10 are divalent metal carbonyl complexes. Compounds CS and C6 were 3,5-dimethylpyrazole dibromotricarbonyl metal complexes prep

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10

Gomes, de Lima Bernardes Miriam. "Réactivité de complexes organométalliques mono- et dinucléaires : synthèse de thiolato-composés du molybdène, du tungstène et du cobalt : étude de la formation de liaisons c-c dans la sphère de coordination du métal." Brest, 1986. http://www.theses.fr/1986BRES2008.

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Caracterisation des complexes ((c::(5)h::(5))(co)::(2) lwc(cf::(3)) = c(cf::(3))h) et (c::(5)h::(5))(co) lwc(o)c(cf::(3)) = c(cf::(3))h) (l=co,pr::(3),p(or)::(3)) synthese de complexes dinucleaires de mo et w. L'addition oxydante de dialkylsulfure a des derives biportes de mo(ii) et w(ii) a donne lieu a la formation de complexes thiolato triportes ((c::(5)h::(5))(co)m(mu -sr)::(3)m(co)(c::(5)h::(5)))tx**(-)

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11

GOMES, DE LIMA LUIS CARLOS. "Reactions d'alcynes cyanes (monocyanoacethylene et dicyanoacethylene), vis-a-vis de complexes organometalliques du fer, du cobalt, du molybdene et du tungstene." Brest, 1986. http://www.theses.fr/1986BRES2009.

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Etude de la reactivite de complexes thiolates du fer et du tungstene (cp(co)::(n) m(sch::(3))) vis a vis du mono et du dicyanoacetylene. Aptitude des complexes de co(i) a intervenir dans la formation de molecules organiques. Nature des liaisons m-pb(m=mo ou w) dans les complexes cp(co)::(3)m-pbr::(3) et (cp(co)::(3)m)::(2) pbr::(2). Donnes de rmn de **(95)mo et **(207)pb

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12

Parlier, Andrée. "Application des complexes carbeniques du tungstene a la synthese organique et organometallique." Paris 6, 1987. http://www.theses.fr/1987PA066570.

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13

Achi, Sabah Samira. "Nouvelle voie d'acces aux acides alpha -amines, par catalyse homogene a l'aide de complexes de metaux de transition, synthese de nouveaux complexes phosphores chiraux du tungstene pentacarbonyle." Paris 6, 1987. http://www.theses.fr/1987PA066227.

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14

Bair, Joseph S. "Synthesis and Optical Properties of Four Oligothiophene-Ruthenium Complexes and Synthesis of a Bidentate Ligand for C-F Bond Activation." BYU ScholarsArchive, 2006. https://scholarsarchive.byu.edu/etd/1031.

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Photovoltaic cells and fluorescence sensing are two important areas of research in chemistry. The combination of photon-activated electron donors with electron acceptors provides a strong platform for the study of optical devices. A series of four oligothiophene-ruthenium complexes has been synthesized. Variation in oligothiophene length and bipyridine substitution allowed comparison of these variables on electronic properties. The longer oligothiophenes display lower energy absorption and emission compared to the shorter ones. Aromatic conjugation appears more complete with para-, rather than

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15

Bornet, Céline. "Synthèse et réactivité de nouveaux macrocycles séléniés." Dijon, 1998. http://www.theses.fr/1998DIJOS043.

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Ce mémoire apporte une contribution à la synthèse et à l'étude des propriétés complexantes de nouveaux macrocycles séléniés. Ceux-ci ont été pour la plupart construits autour d'entités rigides de type orthodisélénophénylène obtenues au départ d'un complexe du zirconium préparé antérieurement au laboratoire. Une chaine oxygénée a été dans chaque cas utilisée pour réaliser la cyclisation ou pour jouer le rôle d'espaceur entre deux entités. A des fins de comparaisons, d'autres systèmes construits au départ de ligands orthothio-séléno ou orthothio-tellurophénylène ont également été synthétisés. Le

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16

Huang, Chih-Chiang, and 黃治強. "Synthesis and Reactivity of the 1,8-Cyclotetradecadiyne Carbonyl Tungsten Complexes." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/59cvuh.

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17

"SYNTHESIS AND CHARACTERIZATION OF CARBONYL - TUNGSTEN(0) COMPLEXES OF [N,N'-BIS(FERROCENYLMETHYLENE)ETHYLENEDIAMINE]." Master's thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/12606101/index.pdf.

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18

Lin, Jia-Shyang, and 林嘉祥. "1. Synthesis of ACE inhibitor-Enalapril 2. Studies on Tungsten Propargyl Complexes: Application to Carbonyl Cyclization Reaction." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/72266922207148220804.

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碩士<br>國立清華大學<br>化學系<br>86<br>Enalapril為一種已上市之ACE抑制藥劑，其結構中含有L-丙氨醯-L-脯氨酸雙的片斷。然而以往合成Enalapril的方法不是反應條件激烈，使用特殊試劑，便是總產率偏低。本篇論文主要研究的重點便在於改進以上的缺點以期得到更好的結果。利用Michael加成反應，可將L-丙氨酸引入4- 苯基-2-丁烯酸乙酯的雙鍵上，再利用鍵的縮合反應，便可以將L-脯氨酸的胺基與N-(1-S-乙氧羰基-3-苯丙基)-L-丙氨酸的羧基縮合成鍵。經由本合成方法，可避免使用較激烈的反應條件及特殊的反應試劑，不啻為合成Enalapril另一可行的方法。另一方面在有機金屬鎢-h1-丙炔基化合物反應的研究上，我們發現具多電子的苯環化合物在推電子基團的輔助及質子酸的存在的條件下可與鎢上的羰基進行一親核性的羰基化環化反應而形成一具有羰基的環化產物。且由於苯環上的電子效應及立體效應，對於此類羰基化環化反應的反

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19

Ioachim, Elena. "Des nouvelles classes de photosensibilisateurs : nouveaux complexes métalliques à base de 4,4'-bipyrimidine substituée." Thesis, 2005. http://hdl.handle.net/1866/16781.

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