• Refine Query
  • Source
  • Publication year
  • to
  • Language
  • 129
  • 9
  • 5
  • 4
  • 4
  • 2
  • 1
  • 1
  • Tagged with
  • 178
  • 66
  • 61
  • 34
  • 24
  • 18
  • 16
  • 14
  • 14
  • 13
  • 12
  • 12
  • 11
  • 11
  • 11
  • 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.
21

Hydrido complexes of osmium and platinum with tertiary phosphine ligands

Frost, P. W. January 1984 (has links)
No description available.
22

High nuclearity clusters of osmium

Drake, S. R. January 1987 (has links)
The work described in this Thesis is a study of the synthesis and reactivity of some giant osmium carbonyl clusters and an investigation into their magnetic and electronic properties. Chapter One contains an overview of the concept of the chemical bond from Dalton to the present day ideas of Wade and Mingos, and their application to transition meial clusters. Chapter Two is an investigation into the fluxional and dynamic behaviour of mixed-metal clusters in solution using multinuclear N.M.R. (lH,iaC, and 3lP{1H}). The clusters [Os10C(CO)24MPR3]-(M = Cu, Ag or Au) and [Os1oC(CO)24(MPR3)(M>PR3)] (M = M'= Ag or Au, and M 5* M' Ag and Au) have been examined using these techniques. Chapter Three reports the synthesis of the dianion [Os11C(CO)27]2~, a cluster containing a trigonal prismatic geometry and its reaction with elec-trophiles such as H+, I2, [Cu(NCMe)4]PF6, AuPR3Cl and AgBF4. THe X-ray structure of [HOsnC(CO)27]~ is described, and the conversion of [OSllC(CO)27]2- to [Os10C(CO)24]2-. Chapter Four is concerned with the synthesis of giant osmium clusters using [Os10C(CO)24]2"~ as a precursor and reacting it with Hg(CF3COO)2 to form [Os20Hg(C)2(CO)42]2-, [Os30Hg2(C)3(CO)72]2-and [Os40Hg3(C)4(CO)oe] • The corresponding gold derivatives, [Os10C(CO)24AuBr]- and [Os20Au(C)2(CO)40]2~ have also been prepared and fully characterised by X-ray crystallography. Chapter Five describes the use of l87Os-1H satellites and Inversion-Recovery 1H n.m.r. as aids in the study of the dynamic behaviour of hydrido osmium carbonyl clusters in solution. In particular the work has focussed on differentiating between hydride ligands in tetrahedral or octahedral interstitial sites. The improved synthesis of [H4Osio(CO)24]3~ is reported and its reactions with electrophiles are discussed. The dianion reacts with H+ to form [H5Os10(CO)24]~ which has been characterised by an X-ray structural determination. Chapter Six presents UV/visible, magnetic and EPR measurements on a range of osmium carbonyl clusters prepared in Chapters Two to Five. A molecular orbital framework for understanding these results is presented. Finally Chapter Seven contains the experimental section and spectroscopic data.
23

Synthesis and properties of some amine and thioether complexes of ruthenium and osmium /

Che, Chi-ming. January 1981 (has links)
Thesis--Ph. D., University of Hong Kong, 1982.
24

The chemistry of Osmium-Rhodium mixed-metal carbonyl clusters

洪若華, Hung, Yeuk-wah. January 1998 (has links)
published_or_final_version / Chemistry / Master / Master of Philosophy
25

Synthesis and properties of some amine and thioether complexes of ruthenium and osmium

支志明, Che, Chi-ming. January 1981 (has links)
published_or_final_version / Chemistry / Doctoral / Doctor of Philosophy
26

Syntheses, electrochemistry and photophysical and photochemical properties of some high-valent oxo, nitrido and amido complexes of osmium /

Chin, Kwok-fai. January 1995 (has links)
Thesis (Ph. D.)--University of Hong Kong, 1996. / Includes bibliographical references (leaf 235-242).
27

The chemistry of Osmium-Rhodium mixed-metal carbonyl clusters /

Hung, Yeuk-wah. January 1998 (has links)
Thesis (M. Phil.)--University of Hong Kong, 1998. / Includes bibliographical references (leaves 135-145).
28

The chemistry of hexa- and hepta- osmium carbonyl clusters /

Leung, Sze-yin. January 1999 (has links)
Thesis (Ph. D.)--University of Hong Kong, 1999. / Includes bibliographical references (leaves 165-174).
29

The chemistry of osmium-palladium carbonyl clusters /

Chan, Suzanna. January 1995 (has links)
Thesis (Ph. D.)--University of Hong Kong, 1996. / Includes bibliographical references (leaf 142-153).
30

The chemistry of mixed-metal clusters of osmium and palladium /

Hui, Wing-sze, Janesse. January 1998 (has links)
Thesis (Ph. D.)--University of Hong Kong, 1998. / Includes bibliographical references (leaves 191-204).

Page generated in 0.0261 seconds