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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.
1

Synthesis and structural study of functionally substituted #eta#'5-cyclopentadienyl derivatives of transition and main group metals

Piper, Colin January 1994 (has links)
No description available.
2

Studies of linked ferrocenes and ruthenocenes

Arisandy, Christofer January 2002 (has links)
No description available.
3

A study of the reactivity of the titanocene [Ti(#eta#'5-Cp's)←2]

Aazam, Elham Shafik January 2001 (has links)
No description available.
4

Synthesis and applications of chiral-at-titanium organometallic compounds

Hart, Suzanne L. January 1997 (has links)
No description available.
5

Synthesis, structure and catalytic activity of cationic zirconium and hafnium alkyl complexes

Lancaster, Simon John January 1995 (has links)
No description available.
6

The ethene polymerisation behaviour of zirconium metallocenes: A steric and electronic investigation into the influence of substituent effects

Grimmer, Neil Eugene 14 February 2006 (has links)
PhD - Biochemistry There are 9 files which have been withheld at the author's request / A systematic investigation into the effect that alkyl and aryl substituents have on the ethene polymerisation behaviour of a series of MAO co-catalysed mono-substituted bis-(cyclopentadienyl)zirconium dichloride and bis-(indenyl)zirconium dichloride metallocenes was carried out. The electronic attributes of the substituents were related to the Hammett substituent functions. The sizes of the ligands were measured from the perspective of the metal using the Tolman cone angle, numerical solid angle and analytical solid angle methodologies. For the mono-substituted cyclopentadienyl metallocenes of formula (CpR)2ZrCl2 (R = Me, Et, iPr, tBu, SiMe3, CMe2Ph), it was found that an optimum ligand size (R = Et, iPr) was required for high activity. These substituents protected the active polymerisation site from deactivation processes. However, if the substituent was too bulky (R = tBu, CMe2Ph) activity dropped drastically. Electronic factors possibly also play a role as demonstrated by the much higher activity of the SiMe3 substituted catalyst over its similarly sized tBu analogue. A series of new bis-(indenyl)zirconium dichloride metallocenes of formula [2–R-Ind]2ZrCl2 (R = H, Me, SiMe3, Ph, Bz and 1-Naphthyl) and [1–R-Ind]2ZrCl2 (R = Me, Et, iPr, tBu, SiMe3, Ph, Bz and 1-Naphthyl) were synthesised. Ethene polymerisation reactions with these metallocenes revealed the same electronic and steric trends observed for the (CpR)2ZrCl2 catalysts. Steric effects were found to play an important role with polymerisation activity decreasing as the size of the substituent increases. Also, the 1-substituted metallocenes had higher activities than their 2-substituted analogues, the differences in their activity increasing with the size of the substituent. By studying the conformations adopted by the indenyl ligands in the solid state, we have rationalised this phenomenon to be a result of the greater steric protection afforded to the active polymerisation site by the 1-substituted metallocenes.
7

Group 14 metallocenes and structure--function relationships in metalloenzymes / Function relationships in metalloenzymes

Jones, Jamie Nicole, 1978- 28 August 2008 (has links)
Not available / text
8

X-ray scattering and thermal analysis study of isotactic polypropylene /

Dai, Shuanghua Patrick. January 2000 (has links)
Thesis (Ph.D.)--Tufts University, 2000. / Submitted to the Dept. of Physics. Adviser: Peggy Cebe. Includes bibliographical references (leaves 246-251). Access restricted to members of the Tufts University community. Also available via the World Wide Web;
9

Metallocene-catalyzed semi-batch and continuous polymerization of ethylene /

Charpentier, Paul A. January 1997 (has links)
Thesis (Ph.D.) -- McMaster University, 1997. / Includes bibliographical references (p. 208-210). Also available via World Wide Web.
10

Group 14 metallocenes and structure--function relationships in metalloenzymes

Jones, Jamie Nicole, Cowley, Alan H., January 2004 (has links) (PDF)
Thesis (Ph. D.)--University of Texas at Austin, 2004. / Supervisor: Alan H. Cowley. Vita. Includes bibliographical references. Also available from UMI.

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