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Showing 1 to 20 of 984 for “"cations"”.
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Separation of alkali metal cations and alkaline earth cations using ionizable crown ethers
… the solvent extraction of group lA and 2A metal cations. For these highly lipophilic ionizable macrocyclic multidentate ligands, the influence of structural variation upon the selectivity and efficiency of cation complexation was probed. Such structural variations included: the polyether cavity …
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Quantum Crystallography of Hydronium Cations
… 2000 crystal structures containing hydronium cations found in the Cambridge Structural Database. The hydronium cationic compounds that were most unusual, mischaracterized, or those of apparent aggregates, were investigated further by geometry optimization and in some cases with the Quantum …
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The Chemistry of Cyclopropylarene Radical Cations
… chemically generated cyclopropylarene radical cations, we have shown that the assumption made in the use of these substrates as SET probes is not necessarily valid. While cyclopropylbenzene radical cation undergoes rapid methanol-induced ring opening (e.g., k = 8.9⁷ s⁻¹M⁻¹), the radical cations …
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Cations and activated sludge floc structure
… was designed to investigate the effect of cations on activated sludge characteristics and also to determine their influence on digestion performance. For this purpose, cations in solution and in floc were evaluated along with various activated sludge characteristics and the collected waste …
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Diffusion of Cations in Various Soil Systems
Made available in DSpace on 2014-12-04T20:17:03Z (GMT). No. of bitstreams: 1 6100100.pdf: 3048617 bytes, checksum: 28746edd1f80e09ba78d46182a71a702 (MD5) Previous issue date: 1960
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Frustrated Lewis Pair Reactivity of Phosphino-Phosphenium Cations
… stable adducts of phosphino-phosphenium cations (PPCs) will be reported. PPCs have been known for over four decades, and PPCs [Ph2ClPPPh2]+ and [Ph3PPPh2]+ have been known for two decades. Yet no one had applied them in FLP chemistry. Initially, a dibenzo-7-phosphanorbornadiene and …
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Recognition of Cations and Anions by Lanthanide Complexes
Transition metal cations and oxoanions are involved in many biological and environmental processes. Biologically, these ions have roles in aging and in the pathogenesis of a wide variety of disorders including neurodegenerative diseases such as Alzheimer’s and Parkinson’s, inflammation, reperfusion …
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Chelated fluoroboron cations : synthesis and multinuclear nmr studies
The preparation of chelated difluoroboron cations (DD)BF2+, where DD is a saturated polydentate tertiary-amine or polydentate aromatic ligand, has been systematically studied by using multinuclear solution and solid state nuclear magnetic resonance spectroscopy and fast atom bombardment mass …
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The effects of cations on activated sludge characteristics
… study were caused by the addition of divalent cations and whether the deterioration of the sludge was due to sodium ion additions. Bench-scale, activated sludge reactors were fed wastewater from the Celanese plant to model plant conditions. Sodium was added in an attempt to cause deterioration …
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The influence of cations on activated sludge behavior
This study investigated the influence of cations on biopolymer characteristics and sludge properties. Settling and dewatering properties of sludges were measured and correlated to the biopolymer characteristics. In addition, effects of cations on sludge conditioning with polymer were studied. …
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Spectroscopic investigations into small astrochemically relevant open-shell cations
Contains fulltext : 319694.pdf (Publisher’s version ) (Open Access)
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Using Major Anions and Cations to Describe Trans-Pecos Springs
No abstract prepared.
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Characterization of sorption processes of organic cations onto oxidic surfaces
… accurate prediction of the sorption of organic cations, are not yet available. For this reason, the general objective of this thesis was to improve the fundamental process understanding of the interactions between dissolved cationic organic substances and solid surfaces including relevant …
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Photosynthetic adaptations in grasses to abnormal levels of soil cations
… grasses adapted to growth on abnormal levels of cations. The main investigative plants belong to the Agrostis genus. Plants were sampled from habitats with soi.ls which provided a range of abnormal levels of cations; mine spoil sites with heavy metal contaminations, calcareous and acidic sites …
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Embedded-fragment studies of ice, water, and molecular cluster cations
… (VBCT) method was proposed for molecular cluster cations. VBCT approaches construction of an effective Hamiltonian in a basis of charge-localized configurations, which are intuitively amenable to fragmentation. The Hamiltonian matrix elements are directly defined in terms of embedded-fragment …
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Applications of fluorous chalcogenides and of radical cations in organic synthesis.
Applications of fluorous chalcogenides and of radical cations in organic synthesis.
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Synthesis and electron spin resonance spectroscopy of organo-sulfur radical cations
<p>A series of new radical cations in 1,4-dithiin, 1,4-benzodithiin, 2,3-dihydro-1,4-dithiin, 1,4-dithiepin, 1,2-dithietane, 1,2-dithiolane, 1,2-dithiane series were prepared. The SOMO of 1,4-dithiin, 1,4-benzodithiin, 2,3-dihydro-1,4-dithiin radical cations were found to be symmetrical while the …
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