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Showing 1 to 20 of 24 for “"Group 14"”.
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Further studies of group 14- cobalt carbonyl chemistry
… describes investigations into several areas of group 14-cobalt carbonyl chemistry including substitution of a bridging carbonyl ligand by an R₂GeH₂ species to form a GeCo₂ triangle, reactions of germanium-cobalt carbonyl clusters with transition metal carbonyl anions and the reactions of …
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GENETICS OF GROUP 14 HERBICIDE TOLERANCE IN LENTIL
… and fluthiacet methyl are two herbicides of group 14 which have not previously been used in lentil production. Tolerance to these two products was investigated through a set of field trials in combination with electrolyte leakage assays. The result of field trials showed that sulfentrazone …
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Aspects of group 14 element - transition metal cluster chemistry
… containing trigonal pyrimidal and spiro μ₄-EM₄ groups has been investigated using cyclic voltammetry. LₙMECo₃(CO)₉ (E = Si, Ge; and MLₙ = Co(CO)₄, Mn(CO)₅) compounds undergo an electrochemically reversible one electron reduction process, conforming with what has been reported for YCCo₃ (CO)₉ …
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Theoretical study of nanocrystals and other functional nanostructures of silicon and alternative group - 14 elements
… are based on earlier findings of prof. Zdetsis’ group for spherical Si quantum dots, are in full agreement with those results and predictions. We have expanded our study to selective cases of pure C, Ge, Sn and their mixed nanocrystals and nanowires. Thus, the classes of systems studied here …
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Computational Studies on Group 14 Elements (C, Si and Ge) in Organometallic and Biological Compounds.
… of computational studies were carried out on Group 14 (C, Si and Ge) elements in organometallic and biological compounds. Theoretical studies on classical and H-bridged A3H3+ (A=C, Si and Ge) as p ligands with different organometallic fragments at B3LYP and B3P86 level reveal a reverse charge …
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Synthesis and characterization of transition and some group 14 metal complexes containing ligands derived from 2-acetylpyridine and hydrazide derivatives, and their antiplasmodium activities
The synthesis and characterization of two sets of metal complexes containing ligands derived from 2-acetylpyridine and hydrazide derivatives is reported. The first set consists of complexes containing a ligand derived from 2-acetylpyridine and S-methyldithiocarbazate while the second set is of …
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Doubly Bonded Derivatives of Si and Ge: Cycloaddition Reactions and Polymer Chemistry
… are a fundamental class of unsaturated Group 14 compounds and play a central role in the synthesis of functional Group 14 compounds. The objective of this research was to investigate the various aspects of group 14 (di)tetrelenes (R2M=ER2, M = Si, Ge, and E = C, Si, Ge) reactivity. The …
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Synthesis, Characterization, and Applications of Group 13 and 14 Complexes of Chelating Formazanate Ligands
… describes the synthesis and characterization of group 13 (boron and aluminum) and group 14 (silicon, germanium, and tin) complexes supported by chelating formazanate [R1-N-N=C(R3)-N=N-R5]‒ ligands. The resulting complexes are redox-active and often luminescent. Chapters two to four describe the …
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Formal Insertion Reactions Of Stannylenes And Germylenes Into Phosphorus-Halogen Bonds: A Structural And Mechanistic Investigation
<p>Insertion reactions of Group 14 carbenoids, divalent species of the form (R<sub>2</sub>N)<sub>2</sub>M (M = Ge or Sn) into the P-halogen bond of halophosphines have been known for some time. However, very few examples have been reported and no evidence has been presented regarding the mechanism …
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Neue Reaktionsweisen eines Tetragermabuta-1,3-diens und von Digermenen
… proceeds with exchange of an aryl- by a Cp-group and gives a tetragermacyclobutene. The attempted reaction of 1 with decamethylgermanocene did not succeed. However, the crystal structure of Ge(Cp*)2 could be determined. It fits well in the series of decamethylmetallocenes of group 14. The …
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Quantitative Trait Loci (Qtl) Analysis Of Sulfur Sensitivity In Vitis Aestivalis-Derived 'Norton'
… hybrids. A mapping population, consisting of 147 F1 genotypes, was created by crossing V. aestivalis-derived ‘Norton’ and V. vinifera ‘Cabernet Sauvignon’ to identify the genetic basis for sulfur sensitivity in North American wine grapes. Clonally propagated F1 genotypes were fumigated with …
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Tris-Pyridyl Ligands and Beyond: Modifications Derived from the Bridgehead and Donor Vector
… 4-pyridyl based ligands E(py)3 (where E = a main group bridgehead atom or group, and py = a pyridyl donor arm) is presented. The main conclusion from this survey of the literature is that, despite recent developments in this area, there are some significantly unexplored fields. This is …
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The Reactivity of Ditetrelenes Towards Organophosphorus Oxides
… oxides provides another example of a main group oxide that can be activated by ditetrelenes 4 and 5 in addition to nitro and sulfonyl containing compounds, CO and CO2. The mechanism for the reaction of diorganophosphorus oxides and phosphites with ditetrelenes 4 and 5 was investigated …
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Synthesis and reactivity studies of mono-, bi-, and trimetallic complexes supported by oxidatively-resistant polyanionic ligands
… networks enforced by the carboxamide N-H groups of the pre-organized second-coordination sphere. The cobalt(II) complex serves as a selective colorimetric turn-on fluoride sensor and represents a unique example of a transition-metal based fluoride sensor where fluoride binding takes place …
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Neonatal apgar score outcomes in spinal versus general anaesthesia at the university teaching hosipital (UTH) lusaka
… out of 54 (37%) in the spinal anaesthetic group had an Apgar score less than 8 at 1 minute. Out of the 16 neonates in the general anaesthesia group, 14 (87.5%) had Apgar score less than 8 at 1 minute. One (2%) neonate had an Apgar score less than 8 at 5 minutes in the spinal anaesthesia …
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Neonatal apgar score outcomes in spinal versus general anaesthesia at the university teaching hosipital (UTH) lusaka
… out of 54 (37%) in the spinal anaesthetic group had an Apgar score less than 8 at 1 minute. Out of the 16 neonates in the general anaesthesia group, 14 (87.5%) had Apgar score less than 8 at 1 minute. One (2%) neonate had an Apgar score less than 8 at 5 minutes in the spinal anaesthesia …
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Photodetachment Studies of Atomic Negative Ions Through Velocity-Map Imaging Spectroscopy
… has been used in photodetachment studies of the Group 14 negative ions Ge-, Sn-, and Pb- at a photon wavelength of 532 nm. Measurements of the photoelectron angular distributions and asymmetry parameters for Ge- and Sn- were benchmarked against those measured previously [W. W. Williams, D. L. …
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Recurrent Streptococcal Pharyngotonsillitis Studies on etiology and treatment
In acute pharyngotonsillitis group A streptococci (GAS) is the etiological agent in 30-50% of cases. Phenoxymethylpenicillin (pcV) is the drug of choice in Sweden. However, the failure rate is as high as 5-25% and further pcV treatment is followed by still higher failure rates. The background of …
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A study of the john Cunningham virus (jcv) seroprevalence among Zambian adults presenting with “meningoencephalitis” to the university teaching hospital, Lusaka, Zambia
… features of the HIV positive JCV positive group with confirmed PML cases. Final analysis for JCV seroprevalence was done in 96 patients and noted to be 46% (95% CI, 35.62 – 56.31). The JCV seroprevalence in the HIV positive group was 40.82% and in the HIV negative group was 51.06 % but …
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A study of the john Cunningham virus (jcv) seroprevalence among Zambian adults presenting with “meningoencephalitis” to the university teaching hospital, Lusaka, Zambia
… features of the HIV positive JCV positive group with confirmed PML cases. Final analysis for JCV seroprevalence was done in 96 patients and noted to be 46% (95% CI, 35.62 – 56.31). The JCV seroprevalence in the HIV positive group was 40.82% and in the HIV negative group was 51.06 % but …
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