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Controlled Release of Carbon Monoxide from a Pseudo Electron- Deficient Organometallic ComplexPitto-Barry, Anaïs, Barry, Nicolas P.E. 16 November 2018 (has links)
Yes / A 16-electron iridium organometallic is reacted with carbon monoxide to form an 18-electron CO-adduct. This
CO-adduct is stable for weeks in the solid state, but quickly reverts to its parent 16-e complex in tetrahydrofuran solution,
releasing CO(g). Using a simple methodology, we show that this gas can subsequently be used to perform a carbonylation
reaction on another molecule. / Royal Society; Academy of Medical Sciences/the Wellcome Trust/the Government Department of Business, Energy and Industrial Strategy/the British Heart Foundation Springboard Award
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Synthesis of Gold Complexes From Diphosphine Ligands and Screening Reactions of Heterocyclic Acetylacetonato (ACAC) Ligands with Transitional Metal ComplexesNyamwihura, Rogers 08 1900 (has links)
Syntheses of diphosphine gold (I) complexes from gold THT and two ligands, 4, 5-bis (diphenylphosphino)-4-cyclopenten-1, 3-dione (BPCD) and 2,3-bis(diphenylphosphino)-N-phenylmaleimide (BPPM), were done separately. The reactions happened under ice conditions followed by room temperature conditions and produced two diphosphine gold (I) complexes in moderated yield. Spectroscopic results including nuclear magnetic resonance (NMR) and X-ray crystallography were used to study and determine the structures of the products formed. Moreover, X-rays of all newly synthesized diphosphine gold (I) complexes were compared with the known X-ray structures of other phosphine and diphosphine gold (I) complexes. There were direct resemblances in terms of bond length and angle between these new diphosphine gold (I) complex structures and those already published. For instance, the bond lengths and angles from the newly prepared diphosphine gold (I) complexes were similar to those already published. Where there were some deviations in bond angles and length between the newly synthesized structures and those already published, appropriate explanation was given to explain the deviation. Heterocyclic ligands bearing acetylacetonate (ACAC) side arm(s) were prepared from ethyl malonyl chloride and the heterocyclic compounds 8-hydroxylquinoline, Syn-2-peridoxyaldoxime, quinoxalinol and 2, 6-dipyridinylmethanol. The products (heterocyclic ACAC ligands) from these reactions were screened with transition metal carbonyl compounds in thermolytic reactions. The complexes formed were studied and investigated using NMR and X-ray crystallography. Furthermore, the X-ray structures of the heterocyclic ACAC ligand or ligand A and that of rhenium complex 1 were compared with similar published X-ray structures. The comparison showed there were some similarities in terms of bond length and bond angles.
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A bioinorganic investigation of some metal complexes of the Schiff base, N,N'-bis(3-methoxysalicylaldimine)propan-2-olMopp, Estelle 13 April 2012 (has links)
This thesis includes the synthesis, characterisation, antioxidant and antimicrobial activities of Cu(II)-, Co(II)- and Co(III) complexes with N,N'-bis(3- methoxysalicylaldimine)propan-2-ol, 2-OH-oVANPN. The Schiff base ligand, 2-OHoVANPN, is derived from o-vanillin and 1,3-diaminopropan-2-ol. The o-vanillin condensed with 1,3-diaminopropan-2-ol in a 2:1 molar ratio yields this potential tetraor pentadentate ligand. The complexes synthesized are tetra (or penta or hexa) coordinated. Formation of the complexes is symbolized as follows:- MX₂ + 2-OH-oVANPN (2:1) -> [M(2-OH-oVANPN)Xn] + HnX MX₂ + 2-OH-oVANPN (2:1) -> [Mn(2-OH-oVANPN)OH] + H₂X₂ MX₂ + (o-vanillin : diaminopropanol) (1:1) -> [M(1:1)X₂] MX₂ + (o-vanillin : diaminopropanol) (1:1) -> [M₃(1:1)X₄] M = Cu(II), Co(II) or Co(III); X = Cl; n = 1, 2. Their structural features have been deduced from their elemental analytical data, IR spectral data, and electronic spectral data. With the exception of {Cu₃(C₁₁H₁₄N₂O₃)(Cl)₄(H₂O)₆}(A4), the Cu(II) complexes were monomeric with 2-OH-oVANPN acting as a tetradentate ligand. A binuclear Co(II) complex, [Co₂(C₁₉H₁₉N₂O₅)(OH)] (B1), was synthesised and the rest of the Co(II) and Co(III) complexes were monomeric with chloride ions coordinating to the metal centre in some cases. Electronic data suggest that the cobalt(II) complexes have octahedral geometries and the copper(II) complexes have square planar structures – Co(III) is likely to be octahedral. Thermal analyses, which included the copper-block-method for determining sublimation temperatures, revealed that some copper(II) and cobalt(II) complexes are hygroscopic and sublime at 200 °C and below. DSC analyses of the Cu(II) complexes gave exotherms around 300 °C for complexes K[Cu(C₁₉H₂₀N₂O₅)(OH)]·2H₂O (A1) and [Cu(C₁₁H15N₂O₃)(Cl)₂]·2H₂O (A2) and above 400 °C for [Cu(C₁₁H₁₆N₂O₃)(Cl)₂] (A3) and {Cu₃(C₁₁H₁₄N₂O₃)(Cl)₄(H₂O)₆} (A4). Antioxidant studies were carried out against the 2,2-diphenyl-1-picrylhydrazyl radical (DPPH·). The cobalt(II) complex, [Co₂(C₁₉H₁₉N₂O₅)(OH)] (B1), which was synthesized in the presence of KOH, had no antioxidant activity, whilst the other cobalt(II) complexes, [Co(C₁₇H₁₇N₂O₅(Cl))]·1½H₂O (B2), [Co(C₁₉H₂₂N₂O₅) (Cl)₂]·5½H₂O (B3) and [Co(C₁₉H₂₂N₂O₅)(Cl)₂]·5½H₂O (B4), which were synthesised in the absence of KOH, demonstrated antioxidant activity. The latter complexes are candidates for cancer cell line testing, while [Cu(C₁₁H₁₆N₂O₃)(Cl)₂] (A3), {Cu₃(C₁₁H₁₄N₂O₃)(Cl)₄(H₂O)₆} (A4), [Co(C₁₉H₂₁N₂O₅)(Cl)₂ ]·5H₂O (C2) and [Co(C₁₉H₂₀N₂O₅)(Cl)]·3H₂O (C3) may show anticancer activity through possible hydrolysis products. Most of the complexes synthesized displayed antimicrobial activity against Escherichia coli, Staphylococcus aureus, Pseudomonas aeruginosa, Aspergillus niger and Candida albicans. The results indicated that complexes [Cu(C₁₁H₁₆N₂O₃)(Cl)₂](A3), [Co(C₁₉H₂₂N₂O₅)(Cl)₂]·5½H₂O (B3) and [Co(C₁₉H₂₁N₂O₅)(Cl)₂ ]·5H₂O (C2) are active against the Gram-negative Ps. aeruginosa and that the ligand, 2-OH-oVANPN, did not have any activity. The same trend was observed with 2-OH-oVANPN, {Cu₃(C₁₁H₁₄N₂O₃)(Cl)4(H₂O)₆} (A4) and [Co(C₁₉H₂₀N₂O₅)(Cl)]·3H₂O (C3) against the Gram-positive S. aureus. As for activity against E. coli and C. albicans, some complexes showed more activity than the ligand. There is an observed trend here that the metal complexes are more active (toxic) than the corresponding ligand, which is in agreement with Tweedy’s chelation theory.
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Synthetic and Structural Investigations of Main Group and Transition Metal Compounds Supported by a Multidentate [N3C] Donor LigandHammond, Matthew James January 2021 (has links)
Recently, the Parkin group has synthesized tris[(1-isopropylbenzimidazol-2-yl)dimethylsilyl]methane, [Tismᴾʳⁱᴮᵉⁿᶻ]H, a bulky tetradentate tripodal ligand, which upon deprotonation can coordinate to metal centers via three nitrogen donor atoms and a carbon bridgehead to form metal atrane compounds. The [Tismᴾʳⁱᴮᵉⁿᶻ] ligand has been previously shown to stabilize metal hydride complexes, for example [Tismᴾʳⁱᴮᵉⁿᶻ]MgH [Tismᴾʳⁱᴮᵉⁿᶻ]ZnH. However, no attempts had been previously made to employ this ligand to stabilize heavier Group 12 analogues of these complexes, namely the cadmium and mercury hydride derivatives. In addition, all [Tismᴾʳⁱᴮᵉⁿᶻ] complexes previously reported have employed metals in the first or second oxidation states. In this work, an investigation is undertaken to use the [Tismᴾʳⁱᴮᵉⁿᶻ] ligand to stabilize rare examples of cadmium and mercury hydrides, as well as survey how this ligand binds to Group 13 and transition metals in a variety of oxidation states.
In Chapter 1, a series of [Tismᴾʳⁱᴮᵉⁿᶻ] cadmium complexes are reported, including the novel cadmium hydride species [Tismᴾʳᴮᵉⁿᶻ]CdH, which is only the third terminal cadmium hydride species to be structurally characterized by X-ray diffraction. The reactivity of this complex has been probed, revealing the first detailed report of reactivity for a Cd-H bond, as well as the first comparison in relative reactivity between an analogous Cd-H and Zn-H bond. This reactivity of [Tismᴾʳⁱᴮᵉⁿᶻ]CdH includes the ability to insert CO₂ and CS₂, and the resulting cadmium formate and dithioformate complexes have been characterized and discussed, with the latter being the first structurally characterized example of a cadmium dithioformate complex. In addition, [Tismᴾʳⁱᴮᵉⁿᶻ]CdH can undergo hydride extraction to yield the ion pair {[Tismᴾʳⁱᴮᵉⁿᶻ]Cd}[HB(C6F5)₃], a rare example of trigonal monopyramidal cadmium complex. Finally, [Tismᴾʳⁱᴮᵉⁿᶻ]CdMe was synthesized, revealing a different coordination mode of the [Tismᴾʳⁱᴮᵉⁿᶻ] ligand than in the analogous [Tismᴾʳⁱᴮᵉⁿᶻ]ZnMe.
In Chapter 2, a series of [Tismᴾʳⁱᴮᵉⁿᶻ] mercury complexes are reported and compared with their cadmium analogues. This comparison revealed several notable differences between [Tismᴾʳⁱᴮᵉⁿᶻ] mercury and cadmium complexes, most notably that the M-O-Si bond angle in [Tismᴾʳⁱᴮᵉⁿᶻ]HgOSiPh₃ is bent, as opposed to the linear [Tismᴾʳⁱᴮᵉⁿᶻ]CdOPh₃ derivative. The synthesis and characterization of [Tismᴾʳⁱᴮᵉⁿᶻ]HgH, the first mercury hydride complex to be structurally characterized by X-ray diffraction, is also reported. This complex has been crystallized in both the κ⁴ and κ³-coordination mode of the [Tismᴾʳⁱᴮᵉⁿᶻ] ligand, representing the first example of a [Tismᴾʳⁱᴮᵉⁿᶻ] compound to be structurally characterized in two coordination modes.
In Chapter 3, the synthesis of Group 13 and transition metal [Tismᴾʳⁱᴮᵉⁿᶻ] complexes are reported. These compounds include the first examples of [Tismᴾʳⁱᴮᵉⁿᶻ]M(III) complexes, which reveal that trivalent Group 13 [Tismᴾʳⁱᴮᵉⁿᶻ]M halide compounds form charged ion pairs, whereas trivalent transition metal chloride compounds form six-coordinate octahedral complexes. The investigation into Group 13 [Tismᴾʳᴮᵉⁿᶻ] complexes also led to the structural characterization of [Tismᴾʳⁱᴮᵉⁿᶻ]In→InI₃, the first example of a [Tismᴾʳⁱᴮᵉⁿᶻ] compound with a metal-metal bond. A series of [Tismᴾʳⁱᴮᵉⁿᶻ]MCl (M = Mn, Fe, Co, Cu) complexes are reported and their metrical data compared, along with an investigation into the reactivity of [Tismᴾʳⁱᴮᵉⁿᶻ]NiBr, which led to spectroscopic evidence for a [Tismᴾʳⁱᴮᵉⁿᶻ]NiH complex. Finally, the gold complex [κ1-Tismᴾʳⁱᴮᵉⁿᶻ]AuPPh₃ is reported, which adopts a novel κ1-coordination of the [Tismᴾʳⁱᴮᵉⁿᶻ] ligand.
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Organometallic synthons for highly conjugated redox-active materialsSchauer, Philip A January 2009 (has links)
[Truncated abstract] This thesis describes various synthetic approaches toward the synthesis of highly conjugated complexes incorporating multiple transition metal centres. Particular attention is given to the synthesis of mononuclear complexes that allow for the facile assembly of discrete oligo- and poly-nuclear complexes in a controlled, stepwise fashion. Conjugated multi-metallic materials are of interest on account of their unique photophysical and electronic properties, with a particular emphasis on elucidating the nature of intramolecular communication between multiple metal centres. Chapter 1 provides a survey of these topics and current research efforts in the field. Chapter 2 describes the synthesis of Group-VIII allenylidene complexes incorporating a terminal bipyridyl moiety that provides a site for further coordination. The new compound 9-hydroxy-9-ethynyl-4,5-diazafluorene was synthesised, and reaction of this proligand with a coordinatively unsaturated metal fragment yields the allenylidene complexes [MCl(PnP)2=C=C=(4,5-diazafluoren-9-yl)]PF6 (M = Ru, PnP = dppm, dppe, dmpe; M = Os, PnP = dppm) and [CpRu(dppe)=C=C=(4,5-diazafluoren- 9-yl)]PF6. The dmpe-ligated complex is particularly susceptible to decomposition, though it was possible to obtain partial spectroscopic characterisation in addition to a single-crystal X-ray structural determination. The remaining allenylidene complexes are stable compounds readily characterised by standard spectroscopic and electrochemical means, with the bis(diphosphine) complexes characterised by single crystal X-ray structural determinations. ... Reactions of the proligand with [RuCl(PnP)2]+ (PnP = dppm, dppe) led to the isolation of a product spectroscopically consistent with the formation of the target cationic allenylidene complexes, though the complexes were not readily purified and the identity of the accompanying anion was not elucidated. The new compound 4-hydroxy-4- ethynyl-cyclopentadithiophene was also prepared, though the compound was found to be highly unstable and susceptible to rapid decomposition. The derived allenylidene complexes [RuCl(PnP)2=C=C=(4-cyclopentadithiophene)]PF6 (PnP = dppm, dppe) were isolated in a pure form and the complexes stable toward spontaneous decomposition. The thienyl-derived allenylidene complexes were characterised by spectroscopic and electrochemical techniques, with a single-crystal X-ray structural determination undertaken for [RuCl(dppm)2=C=C=(4-cyclopentaditiophene)]PF6. Electrochemical properties are significantly different between the complexes, and also show significant variation between electrodes and solvents. The terminal thienyl substituents are electroactive and show one or two oxidation processes consistent with oligomerisation of the thienyl moiety in dichloromethane solvent, and in acetonitrile solvent cyclic voltammograms are consistent with the deposition of an electroactive film on the electrode surface. The electro-polymerisation of the thienylallenylidene complexes offers a promising new route toward multi-metallic allenylidene complexes.
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Ultrafast photophysical and photochemical dynamics of polyhalogenated alkanes, cycloalkanes, and transition metal complexesBudkina, Darya S. 23 April 2019 (has links)
No description available.
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Condensed phase properties of platinum group metal complexes from computational simulationsBurger, M. R. (Marga Retha) 04 1900 (has links)
Thesis (MSc)--University of Stellenbosch, 2004 / ENGLISH ABSTRACT: A variety of computational techniques are used to calculate structural, thermodynamic and transport
properties of two specific Platinum Group Metal (PGM) complex systems. The first system consists of
a PGM complex ([PdCl4]2-; [PtCl4]2-; [PtCl6]2- or [RhCl6]3-) with sodium counter-ions in a water
solution at 30ºC and at a concentration of 0.106 mol/dm3. The second system under consideration is
that of a PGM complex ([PdCl4]2-; [PtCl4]2-; [PtCl6]2- or [RhCl6]3-) with sodium counter-ions in a water
solution in the presence of four poly (ethylene oxide) (PEO) chains at 30ºC and at a concentration of
0.013 mol/dm3. A conformational study of the two types of dihedral angles in a PEO chain (-C-O-C-Cand
-O-C-C-O-) is performed and the extreme flexibility of the polymer is confirmed. Dihedral angle
distributions of the two dihedral angles are calculated and explained in terms of the potential energy
surface obtained from the conformational study. The solvation geometries of the PGM complexes are
confirmed and the results are contrasted with those in the system where the polymer (PEO) is present.
It is concluded that the effect of the polymer on the structure and degree of solvation is negligible. The
free energy of solvation values of the PGM complexes are calculated to provide insight into their
structural characteristics such as solvation shell volume and geometry. The structural and
thermodynamic properties of the PGM complexes in solution are also used to explain the trends
observed in the calculated diffusion coefficients. Comments are made on the accuracy of the calculated
diffusion coefficients as well as the legitimacy of the mechanistic speculations which results from
them. Suggestions regarding possible future improvements to the computational methods are made. / AFRIKAANSE OPSOMMING: Verskeie berekenings tegnieke is aangewend om die strukturele, termodinamiese en verplasings
eienskappe van twee spesifieke Platinumgroep Metaal (PGM)-kompleks sisteme te bereken. Die eerste
sisteem bestaan uit die PGM-kompleks ([PdCl4]2-; [PtCl4]2-; [PtCl6]2- of [RhCl6]3-) met natrium teenione
in water by 30ºC en met ‘n konsentrasie van 0.106 mol/dm3. Die tweede sisteem bestaan uit die
PGM-kompleks ([PdCl4]2-; [PtCl4]2-; [PtCl6]2- of [RhCl6]3-) met natrium teen-ione in water in die
teenwoordigheid van vier poli-etileenoksied (PEO) kettings by 30ºC en met ‘n konsentrasie van 0.013
mol/dm3. ‘n Studie is gemaak van die konformasies van die twee soorte dihedrale-hoeke in ‘n PEOketting
(-C-O-C-C- en -O-C-C-O-) en die insense buigbaarheid van die polimeer is hiermee bevestig.
Die dihedrale-hoek-verspreidings van die twee tipes dihedrale hoeke is bereken en word verduidelik in
terme van die potensiёle energie kromvlakke soos bereken tydens die konformasie analiese. Die
geometrie van die solvasie van die PGM-komplekse is bereken en vergelyk met die sisteme waar die
polimeer (PEO) teenwoordig is. Hieruit word afgelei dat die effek van die polimeer op die struktuur en
graad van solvasie van die komplekse minimal is. Die vrye energie van solvasie van die PGMkomplekse
is bereken met die doel om insig in te win oor die stukturele eienskappe soos byvoorbeeld
die volume van die solvasie sfeer en die geometrie daarvan. Die strukturele en termodinamiese
eienskappe van die PGM-komplekse in oplossing word ook gebruik om die neigings in die berekende
diffusie koёffisiente te verduidelik. Opmerkings word gemaak aangaande die akkuraatheid van die
berekende diffusie koeffisiente asook die geldigheid van die meganistiese spekulasies wat daaruit
gemaak word. Voorstelle word ook gemaak rakende toekomsige verbeterings aan die reken tegnieke.
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Metal carboxylate complexes relevant to the Fischer-Tropsch synthesisPienaar, Andrew 03 1900 (has links)
Thesis (MSc (Chemistry and Polymer Science))--University of Stellenbosch, 2005. / In a Fischer-Tropsch refinery environment carboxylate complexes are of
interest since the carboxylic acids present in product streams lead to
formation of carboxylate salts through leaching of process equipment and
catalysts. It is widely accepted that decomposition of organic (carboxylic)
acids catalysed by metals is controlled by the decomposition of metal salts or
complexes previously formed with such an acid. The determination of physical
and structural properties of caboxylate complexes could contribute to the
explanation of the mechanism involved in the decarboxylation of carboxylic
acids.
We have successfully determined the molecular structures of copper(II) allyl
acetate, zinc(II) formiate, zinc(II) isovaleroate, yttrium(III) acetate and
lanthanum(III) propionate. It has been established that zinc has a preferred
tetrahedral coordination in carboxylate complexes compared to the octahedral
coordination of copper, lanthanum and yttrium complexes considered. The
carboxylate O-C-O angle in these complexes range between 119° and 125°
and the conformation of the carbon chains is anti in all cases except for
copper(II) allyl acetate, where a gauche conformation is adopted.
Using structural methods such as TGA, infrared spectroscopy and X-Ray
powder diffraction and combining it with existing knowledge of yttrium
carboxylates and the effective use of computational chemistry – to calculate
favourable internal parameters, using DFT calculations and B-LYP level
theory - a likely structure for yttrium(III) propionate is proposed. The use of
infrared measurements were especially valuable towards predictions of
possible structures and the postulations of Nakamoto, on the relation between
carboxylate carbonyl stretching frequencies and the nature of the carboxylate
bond, could be used to accurately identify – except for the formiate salts of
zinc(II) and yttrium(III) – the bonding mode present in the relevant
compounds. We systematically tuned the non-cyclic organic part of the mono carboxylate
ligand by lengthening and branching of the alkyl chain and determined that
thermal decomposition and heat capacity of zinc complexes are a strong
function of the ligand, while the behaviour of analogous yttrium complexes is
hardly affected.
The thermal investigation of lanthanum(III) propionate yielded a result that is
in contrast with a previous study - where only CO2 was reported as byproduct
- and we report an alternative result which indicates formation of symmetric
ketones when the compound is heated to a high enough temperature. Earlier
general assumptions about the layer-like crystal structure of lanthanum
complexes coordinated by alkyl chain carboxylate are contradicted by the
crystallographic data we collected for this compound. The crystal packing of
lanthanum(III) propionate clearly shows a layered structure which is
unexpected for a carboxylate with such a short alkyl.
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Structural analysis of transition metal complexes of imidazole-derived ligandsPotts, Storm Victoria 12 1900 (has links)
Thesis (MSc (Chemistry and Polymer Science))--University of Stellenbosch, 2009. / Please refer to full text to view abstract.
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α-Diimine complexes of transition metals for the polymerisation of lower α-olefins / a-Diimine complexes of transition metals for the polymerisation of lower a-olefinsFullaway, Phillip V. 12 1900 (has links)
Thesis (MSc (Chemistry and Polymer Science))--University of Stellenbosch, 2005. / In this study several potential polymerisation catalysts were synthesised. This was
accomplished by coordinating α-diimine ligands such as N,N'-diferrocenyldiazabutadiene
(DFDAB), N,N'-dimesityldiazabutadiene (DMDAB) as well as the
bidentate amine N,N,N',N'-tetramethylethylenediamine (TMEDA), to several transition
metals.
The multi-step synthesis of N,N'-diferrocenyldiazabutadiene (DFDAB) from ferrocene
involved the use of lithiated ferrocene, iodoferrocene, N-ferrocenylphthalimide and
aminoferrocene; the latter three were characterised. This ligand was coordinated to the
transition metal ions iron(II) and zinc(II) to form Fe(DFDAB)Cl2 and Zn(DFDAB)Cl2
respectively. 1H and 13C NMR, FT-IR and mass spectrometry revealed that the expected
product had been synthesised in a useful form.
2,4,6-Trimethylaniline reacted with glyoxal to form N,N'-dimesityldiazabutadiene
(DMDAB). The DMDAB ligand was coordinated to the transition metal ions zinc(II) and
silver(I) to form Zn(DMDAB)Cl2 and Ag(DMDAB)2 respectively. Characterisation now
also include molecular and crystallographic structural determinations by means of X-ray
diffractometry.
Another N-donor complex, Cr(CO)4(TMEDA), was also prepared by coordinating
N,N,N',N'-tetramethyl ethylenediamine (TMEDA) to Cr(CO)5(THF). This was done to
give an indication of the activity of low oxidation state complexes in the catalysis of
olefin polymerisation.
The metal-α-diimine complexes mentioned above were employed in the polymerisation
of the monomers ethylene and 1-pentene probably according to a cationic mechanism.
High density, high molar mass polyethylene products with narrow polydispersities were
obtained. The chromium(TMEDA) complex produced polyethylene exhibiting ultra-high
molar mass (> 10 000 kg/mol). The polymerisation of 1-pentene, using the
Fe(DFDAB)Cl2 complex, afforded oligo-pentene with a molar mass of ~800 g/mol. After an unsuccessful attempt to prepare the (CO)5Cr=C(OZrCp2Cl)(ferrocenyl) modified
Fischer-type carbene complex, the (CO)5Cr=C(OMe)(ferrocene) complex was eventually
insolated. Elucidation of its molecular structure was accomplished by X-ray
diffractometry.
Finally, the DFDAB-ligand was coordinated to Fe2(CO)9 to generate Fe(CO)3(DFDAB)
in another attempt to investigate the role of carbonyl groups and also low oxidation state
metals in polymerisation reactions [compare to Cr(CO)4(TMEDA) unit above]. The
sensitivity of this complex towards moisture and air prevented such action.
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