Abstract Picture of Alex Turta (Available In Full Paper) is a project leader for Improved Oil Recovery at Alberta Research Council (ARC) in Calgary. His research interests include primary recovery heavy oils, waterflooding light and thermal methods oil. He has extensive experience oil exploitation, from laboratory to field pilots, undertaken international consultancy pilot evaluation. assisted the development enhanced evaluation software PRIze. holds M.Sc. Ph.D. degrees University Gas...

A set of four [Mn(II)(L(7)py(2)(R))](2+) complexes, supported by the tetradentate 1,4-bis(2-pyridylmethyl)-1,4-diazepane ligand and derivatives with pyridine substituents in 5 (R = Br) 6 positions Me MeO), are reported. X-ray crystal structures these complexes all show L(7)py(2)(R) ligands bound to give a trans complex. Treatment Mn(II) precursors either H(2)O(2)/Et(3)N or KO(2) MeCN at -40 degrees C results formation peroxomanganese [Mn(III)(O(2))(L(7)py(2)(R))](+) differing only identity...

Peroxomanganese(III) adducts have been postulated as important intermediates in manganese-containing enzymes and small molecule oxidation catalysts. Synthetic peroxomanganese(III) complexes are known to be nucleophilic facilitate aldehyde deformylation, offering a convenient way compare relative reactivities of supported by different ligands. In this work, tetradentate dipyridyldiazacycloalkane ligands with systematically perturbed steric electronic properties were used generate series...

Deposition of CH3ReO3 onto the surface dehydrated, amorphous silica-alumina generates a highly active, supported catalyst for metathesis olefins. However, with high (10 wt %) Re loading is no more active than low (1 loading, while on silica completely inactive. Catalysts prepared by grafting contain two types spectroscopically distinct sites. The strongly bound sites are responsible olefin activity and formed preferentially at loadings (< or =1 %). They created Lewis acid/base interactions:...

Three peroxomanganese(III) complexes [MnIII(O2)(mL52)]+, [MnIII(O2)(imL52)]+, and [MnIII(O2)(N4py)]+ supported by pentadentate ligands (mL52 = N-methyl-N,N′,N′-tris(2-pyridylmethyl)ethane-1,2-diamine, imL52 N-methyl-N,N′,N′-tris((1-methyl-4-imidazolyl)methyl)ethane-1,2-diamine, N4py N,N-bis(2-pyridylmethyl)-N-bis(2-pyridyl)methylamine) were generated treating Mn(II) precursors with H2O2 or KO2. Electronic absorption, magnetic circular dichroism (MCD), variable-temperature, variable-field MCD...

Herein we describe the chemical reactivity of mononuclear [MnII(N4py)(OTf)](OTf) (1) complex with hydrogen peroxide and superoxide. Treatment 1 one equivalent superoxide at −40 °C in MeCN formed peroxomanganese(III) adduct, [MnIII(O2)(N4py)]+ (2) ∼30% yield. Complex 2 decayed over time formation bis(μ-oxo)dimanganese(III,IV) complex, [MnIIIMnIV(μ-O)2(N4py)2]3+ (3) was observed. When higher yields (∼60%) using excess superoxide, species thermally to MnII 3 no greater than 10% resulted ∼90%...

The electronic structures of the bis(hydroxo)manganese(IV) and oxohydroxomanganese(IV) complexes [MnIV(OH)2(Me2EBC)]2+ [MnIV(O)(OH)(Me2EBC)]+ were probed using absorption, magnetic circular dichroism (MCD), variable-temperature, variable-field MCD spectroscopies. d−d transitions assigned a group theory analysis coupled with results time-dependent density functional computations. These assignments permit development an experimentally validated description for π σ interactions in this complex....

The room-temperature, gas−solid reaction of volatile GaMe3 with a nonporous silica was studied by elemental and gas-phase analysis, in situ IR 1H, 13C, 29Si solid-state NMR, extended X-ray absorption fine structure (EXAFS) spectroscopy. Most the grafting (∼85%) occurred on Q3 sites, O3SiOH, but small amount (∼15%) siloxane (O3SiO−SiO3) bond cleavage also observed. major, if not only, gallium product has empirical formula ⋮SiOGaMe2, it is an "isolated" site. Ga K-edge EXAFS GaMe3-modified...

Deposition of CH3ReO3 onto the dehydrated surface an amorphous silica−alumina (Si/Al = 4.8) generates a catalyst for olefin metathesis, although itself is not active. The nature interactions between and grafted organometallic complex was probed by 1D 2D 1H, 13C, 27Al solid-state NMR, IR, EXAFS, DFT calculations. methyl ligand remains bound to Re, but grafting alters its symmetry, as well shielding 13C 1H nuclei. Chemisorption intact molecular occurs via interaction one oxo with Al site,...

Hydrotris(3-phenyl-5-methylpyrazoyl)boratonickel(II) complexes with organoxanthate or dithiocarbamate coligands equilibrate between κ2- and κ3-chelation modes of the scorpionate ligand in solution, connecting N2S2 square-planar N3S2 pyramidal fields a spin crossover. The also exhibit quasi-reversible oxidations at low anodic potentials, thus modeling structure, dynamics, redox reactivity reduced NiSOD active site.

In oxide-supported perrhenate catalysts, isolated Re(VII) becomes anchored to the support at surface hydroxyl sites. However, oxides that also possess Lewis acidity offer possibility of additional bonding interactions with perrhenate, which may account for their enhanced activity, example, in olefin metathesis. Evidence such was sought by X-ray absorption spectroscopy Re L1- and L3-edges, combination DFT modeling. Only grafted onto silica using an anhydrous method shows a simple ≡SiOReO3...

Dominant conduction orbitals of paddle-wheel organodiruthenium complexes can be facilely controlled by the substituents embedded in amidinato ligands.

Five new pseudotetrahedral nickel(II) arylthiolate complexes TpR,MeNi−SR′ [(TpR,Me)− = 2,2,2-κ3-hydridotris(3-R,5-methylpyrazolyl)borate; R Me, R′ C6H5 (Ph), 2,4,6-C6H2(CH3)3 (Mes); Ph, (Mes), and 2,6-C6H3(CH3)2 (Xyl)] were prepared by metathesis reactions of known chloride with sodium salts in THF. The products fully characterized. effect increasing bulk substituents at the proximal 3-pyrazolyl ortho-thiolate positions represented this series was evident spectroscopic studies (UV–vis-NIR,...

A novel and efficient method for preparing [MnIII(O2)(L)]+ complexes using electrochemically generated superoxide is reported, with the reaction probed by low temperature electronic absorption electron paramagnetic resonance spectroscopic techniques.

The insertion of HOCH2C⋮CH (ha) into the Ru−C bond RuII(RL1)(PPh3)2(CO)Cl, 1, has afforded RuII(RL3)(PPh3)2(CO)Cl, 3, which been structurally characterized. Insertion rates in CH2Cl2−MeOH for ha as well PhC⋮CH (pa), inserts similarly 1 affording RuII(RL2)(PPh3)2(CO)Cl, 2, are proportional to product concentrations alkyne and methanol. rate is nearly 5 times faster than that pa, a given increases R becomes more electron-withdrawing (OMe < Me Cl). A reaction model implicating adduct 1·MeOH,...

The reaction of [Ru(C6H2OH-2-CHNR-3-Me-5)(PPh3)2(CO)(NO2)] 1 (R = Et, p-MeC6H4 or p-ClC6H4) with an excess alkyne HCCX (X H, Ph CH2OH) in CH2Cl2–MeOH medium was accompanied by linkage isomerization nitrite (O,O′-bonded → N-bonded) and formation a six-membered vinyl–phenolato chelate ring to give [Ru(η2-C6H2CXCH-1-O-2-CHNHR-3-Me-5)(PPh3)2(CO)(NO2)] 4. active substrate is the solvate 1·MeOH, 2 + addition bulky CX group proceeds regiospecifically carbon end Ru–C bond. Compound 4 has also been...

Organometallics of type [Ru(C6H2O-2-CHNHC6H4R-3-Me-5)(PPh3)2(CO)(Cl)], 3 (R = H, Me, OMe, Cl), incorporating a four-membered C,O chelate ring smoothly react with CNBut in benzene solution affording the yellow-colored organoruthenium imidic ester hydrochloride system [Ru(C6H2OCN(But)HCl-2-CHNC6H4R-3-Me-5)(PPh3)2(CO)(CNBut)], 4, which five-membered C,C is present. While stable solid state, 4 spontaneously reactive solution, furnishing red-colored...

The synthesis and structural characterization of the hitherto unreported multiply bonded paramagnetic dirhenium(<sc>iii</sc>,<sc>ii</sc>) nitrobenzoate complexes have been reported.

Proposal In-Situ Combustion Process has been implemented in Santhal field commercial scale for the last 6 years enhancing recovery of heavy oil. The process monitoring is key factor ensuring effectiveness method. This paper describes practices ignition well preparation, sampling and analysis strategy produced fluids coupled with head pressure, temperature effective monitoring. evident from enhancement net oil production field.

Several derivatives of the pseudotetrahedral phenylthiolate complex TpMe,MeNi-SPh (1), TpMe,Me- = hydrotris(3,5-dimethyl-1-pyrazolyl)borate, were prepared incorporating substituted arylthiolates, including a series ortho-substituted ligands TpMe,MeNi-SR (R 2,6-Me2C6H3, 2; 2,4,6-Me3C6H2, 3; 2,4,6- iPr3C6H2, 4; and 2,6-Ph2C6H3, 5) para-substituted complexes C6H4-4-OMe, 6; C6H4-4-Me, 7; C6H4-4-Cl, 8). The products characterized by 1H NMR UV−vis spectroscopy. Spectra 6−8 consistent with...