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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
91

Organometallic complexes as coating material for crystal sorptiondetector

Tam, Yin-king, 譚燕琼 January 1985 (has links)
published_or_final_version / Chemistry / Master / Master of Philosophy
92

Recent advances in the chemistry of pentamethylcyclopentadienyl complexes of zirconium and tantalum

Su, Yu-Chuan January 1980 (has links)
No description available.
93

The kinetics and equilibria of reactions of Toluene-3,4-dithiol with selected metal ions

Brinkman, William John, 1947- January 1973 (has links)
No description available.
94

Carbohydrates as chiral auxiliaries in organometallic reactions

DiCesare, John C. 08 1900 (has links)
No description available.
95

Spectroscopic characterization of metal-based complexes and metal-based complex oxidation processes

McQuaid, Michael James 12 1900 (has links)
No description available.
96

The stereochemistry of ligand substitution reactions of cyclopentadienyl-rhodium complexes /

Quinn, Susan M. (Susan Mary) January 1981 (has links)
Diastereomers of CpRh{C(O)Me}(P*)I, (P* (TBOND) (S)-Ph(,2)PNHCH(Me)Ph), have been prepared and separated. Decarbonylation with AgBF(,4) gave a single diastereomer of CpRhMe(CO)(P*)(.)BF(,4) and subsequent treatment of the salt with anions likewise gave single isomers of CpRh{C(O)Me}(P*)X (X = Cl, Br, I, SCN, NCS). The high stereospecificity of these transformations is attributed to the ability of the acyl ligand to undergo stereospecific reversible decarbonylation such that the methyl group occupies the site vacated by the iodide ligand, i.e., inversion. Addition of N(,3)('-) and MeO('-) to the salt resulted in the stereospecific formation of CpRhMe(P*)X' (X' = NCO, COOMe). Metathesis of CpRh{C(O)Me}(P*)Cl with I('-) proceeded with retention of configuration at rhodium. / The chiral complexes (1-C(,9)H(,6)Cl)Rh(COD), (COD (TBOND) 1,5-cyclooctadiene), and (1-C(,9)H(,6)X)Mn(CO)(,3), (X = Cl, Br, I) have been synthesized via diazoindene insertion. Only the pentahapto bonding mode has been detected for these complexes. / Photochemical and chemical decarbonylation of trans-CpFe(CO)(,2){C(O)CH=CHR}, (R = Ph, Me), proceeded with retention of geometry about the double bond to give trans-CpFe(CO)(,2){CH=CHR}.
97

Synthetic and spectroscopic studies of the group IIB dimethylmetals and dimethylacetylene

Newbury, Mary Louisa. January 1975 (has links)
No description available.
98

Structural, electronic and kinetic studies on organometallic intercalates of metal dichalcogenides

Wong, Heng Vee January 1993 (has links)
Large single crystals of the metal dichalcogenide hosts ZrS2 and 811X2 (X = S, Se) have been successfully intercalated with a variety of organometallic guests {C0(η-C5H5)2, CO(η-C5H4CH3)2, Mo(η-C6H6)2, Mo(η-C7H7)(η-C5H5), W(η-C7H7)(η-C5H5), Ti(η-C8H8)(η-C5H5)}. The structural and electronic properties of these materials have been studied, as well as the intercalation kinetics of these organometallic species into the tin dichalcogenides. X-ray and neutron diffraction experiments have been used to obtain 001 reflections in order to obtain a one-dimensional profile of electron and neutron scattering in these disordered layered materials (Chapter Two). Refinement of the data shows that for all the organometallic guests, the majority of the intercalant adopts an orientation in which the principal molecular axis lies parallel to the layer planes of the host. These findings are confirmed by 2H NMR spectroscopy on single crystals of deuterated cobaltocene intercalates of ZrS2 and SnSe2, where it has been shown that rapid C5, but not C2, rotation of the metallocene occurs in the interlamellar van der Waals space. To study the electronic properties of these intercalates, electrical resistivity and magnetic susceptibility measurements have been performed (Chapter Three). An apparatus has been built to measure the resistivity of these crystal intercalates down to 4.2K. The resistivity measurements show that intercalation of various organometallic complexes confers metallic properties upon ZrS2 while SnS2{Co(η-C5H5)2} 0.3 becomes a superconductor with a Tc of 8.3K. The magnetic susceptbility measurements confirm the presence of guest-host charge transfer. Estimates of its extent, as well as the magnitude of the Pauli susceptibility in these intercalates, have been attempted. Studies on the rate and mechanism for the intercalation of cobaltocene into the disulfides and diselenides of tin have been performed (Chapter Four). An apparatus has been designed and constructed for in situ diffraction using synchrotron X-rays in order to monitor the progress of these rapid intercalation reactions. The results indicate that the rate of intercalation of cobaltocene into the tin dichalcogenides is very much dependent on the solvent used, being significantly faster in dimethoxyethane than in toluene. Analyses of the kinetic rate expressions for the tin dichalcogenide intercalation in dimethoxyethane suggests that diffusion of cobaltocene molecules into the interlamellar space constitutes the rate limiting step. The choice of solvent also dramatically affects the mechanism of the intercalation. When a solution of cobaltocene in dimethoxyethane is used, the host transforms directly to the final product but in toluene, staged intermediates are observed during the intercalation process. The apparatus and techniques that have been developed for the in situ kinetics experiments are general and permit dynamic structural transformations in air- and moisture-sensitive suspensions of solids to be effectively studied.
99

In vivo and in vitro interactions of steroids with metals

Pouskouleli, George. January 1980 (has links)
No description available.
100

Reactions of some silyl organometallic compounds : Pt. II. Elucidation of the structure of gomatine, a compound having antihistaminic activity, extracted from crown gall tumors of tomato plants.

Vinokur, Anna Ella. January 1971 (has links)
No description available.

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