Spelling suggestions: "subject:"iigands."" "subject:"igands.""
51 |
The chemistry of triosmium carbonyl clusters containing oxygen and sulphur donor ligands李兆銘, Lee, Siu-ming. January 1996 (has links)
published_or_final_version / Education / Doctoral / Doctor of Philosophy
|
52 |
Coordination chemistry of macrocycles and metal complexes containing a nitrogen and sulphur donor setMarquez Acuna, Victoria Elena January 1988 (has links)
No description available.
|
53 |
Carbonyl clusters of the iron triad containing nitrosyl and sulphido ligandsAttard, J. P. January 1987 (has links)
No description available.
|
54 |
Allenylidene diruthenium chemistryStone, Jon C. January 2001 (has links)
No description available.
|
55 |
THE NATURE OF ORGANOSULFUR LONE PAIR ORBITAL INTERACTIONS WITH TRANSITION METAL D-ORBITALS.ASHBY, MICHAEL THOMAS. January 1986 (has links)
This research has been directed at the study of organosulfur frontier orbital interactions with transition metal d-orbitals. Two novel thioether complexes tricarbonyl(1,4,7-trithiacyclononane)molybdenum(O) and tricarbonyl(2,5,8-trithianonane)molybdenum(O), have been prepared and structurally characterized by single crystal x-ray crystallography. The facial configuration of the carbonyl ligands provides a unique point of reference for describing the two polythioether ligands in terms of the free ligand's frontier orbitals. The relative carbonyl stretching frequencies of the two metal complexes indicate that 1,4,7-trithiacyclononane is a poorer donor than 2,5,8-trithianonane. This result is explained in terms of mechanical constraints placed on the mesocyclic polythioether which are absent in its acyclic analogue. The coordinatively unsaturated species (n⁵-C₅H₅)MO(NO)(SC₆H₅)₂ has been characterized by x-ray crystallography and its electronic structure has been modeled using Fenske-Hall molecular orbital calculations. The monomeric nature and chemical inertness of (n⁵-C₅H₅)MO(NO)(SC₆H₅)₂ are attributed to dπ-pπ bonding between the thiolate ligands and an empty molybdenum dπ orbital. The dπ-pπ interaction simultaneously strengthens the metal thiolate bond and makes the complex less susceptible to nucleophilic attack by raising the energy of the LUMO. The rotational orientations of the thiolate ligands observed in the solid state support this electronic model. For (n⁵-C₅H₅)Fe(CO)₂SR, the dπ-pπI antibonding interaction between the thiolate ligand and the metal has been modeled using Fenske-Hall molecular orbital calculations and experimentally investigated by photoelectron spectroscopy. The calculations predict that the HOMO is metal-sulfurn-antibonding and largely sulfur 3p in character. The observed HOMO ionization energies of (n⁵-C₅H₅)Fe(CO)₂SC₆H₄-p-Z; Z = OMe, H, Cl, CF₃, N0₂; correlate with several chemical properties including the rate of electrophilic attack on the sulfur by alkyl halides to give the thioether complex [(n⁵-C₅H₅)Fe(CO)₂(SR₂)]X and by electron-deficient alkynes to give the heterometallacycle (n⁵-C₅H₅)(CO)FeS(R)-C=C=C=0. The latter reaction is compared to the similar reaction of alkenes and alkynes with (n⁵-C₅H₅)Fe(CO)₂PR₂ to give (n⁵-C₅H₅)(CO)FeP(R)₂-C=C-C=0. X-ray crystal structures of one of the sulfur-containing and one of the phosphorus-containing heterometallacycles have been obtained.
|
56 |
Macrocycles, macrobicycles : a studyMarrs, Deborah Jane January 1990 (has links)
No description available.
|
57 |
Characterisation of hepatitis C virus envelope glycoprotein interactions with cellular receptorsMaidens, Catherine January 2000 (has links)
No description available.
|
58 |
Chemistry and applications of molybdenum phosphorodithioato complexesRead, A. R. January 1983 (has links)
No description available.
|
59 |
The glutathione S-transferases of rat liver mitochondriaHarris, Jonathan Malcolm January 1992 (has links)
No description available.
|
60 |
Soluble silica and aluminium bioavailabilityJugdaohsingh, Ravin January 2000 (has links)
No description available.
|
Page generated in 0.0263 seconds