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Cationic substitution in MgSiO3 perovskite
Physics of the Earth and Planetary Interiors, 2003Abstract Various MgSiO 3 -based compositions were used to investigate the possible cationic substitutions in Earth’s lower mantle perovskite at about 25 GPa and 1750 K, using a multi-anvil press apparatus. Recovered samples were characterized using X-ray diffraction and electron microprobe. Inserted in the silicate perovskite structure were found (i)
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Improved Photoactivity of Pyroxene Silicates by Cation Substitutions
ChemPhysChem, 2018AbstractWe investigated the possibility of band structure engineering of pyroxene silicates with chemical formula A+1B+3Si2O6 by proper cation substitution. Typically, band gaps of naturally formed pyroxene silicates such as NaAlSi2O6 are quite high (≈5 eV).
Merid Legesse +5 more
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Conversion of Phenyl-Substituted Cyclopentadienes to Pyrylium Cations
The Journal of Organic Chemistry, 2004Phenyl-substituted cyclopentadienes are proved to form phenylated pyrylium cations in the presence of silver(I) perchlorate by insertion of an oxygen atom into the cyclopentadiene-ring. Three phenylated pyrylium compounds, [(Ph(5)C(5)O(+))(ClO(4)(-))](2)(CH(2)Cl(2)) (1), Ag(ClO(4))(H(2)O)(Ph(4)HC(5)O(+)) (ClO(4)(-)) (2), and (Ph(3)H(2)C(5)O(+))(ClO(4)(-
Gui Ling, Ning +5 more
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Optical Properties of Cation-Substituted Zinc Oxide
Inorganic Chemistry, 2008Zinc oxide (ZnO)-based optoelectronics has emerged as a frontier area in semiconductor research in recent years. In the design of ZnO-based optoelectronic devices, cation-substituted ZnO serves as essential components for the desired device functions.
Young-Il, Kim, Ram, Seshadri
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Cationic Chains of Parent Arsanylboranes and Substituted Phosphanylboranes
Chemistry – A European Journal, 2017AbstractThe substituted monomeric phosphanylboranes Ph2P−BH2⋅NMe3 (1) and tBuHP−BH2⋅NMe3 (2) have been used for the synthesis of cationic chain compounds built up by R2P−BH2 units. With a simple synthesis route, the highly stable cations [Me3N⋅H2B−PR1R2−BH2⋅NMe3]+ (1 a, 2 a) and [Me3N⋅H2B−PR1R2−BH2−PR1R2−BH2⋅NMe3]+ (1 b, 2 b) (R1=R2=Ph; R1=H, R2=tBu ...
Christian Marquardt +4 more
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Improving the Alkaline Stability of Imidazolium Cations by Substitution
ChemPhysChem, 2014AbstractImidazolium cations are promising candidates for preparing anion‐exchange membranes because of their good alkaline stability. Substitution of imidazolium cations is an efficient way to improve their alkaline stability. By combining density functional theory calculations with experimental results, it is found that the LUMO energy correlates with
Huilong, Dong +8 more
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Photochemistry and Photobiology, 2004
It is well established that for successful photoinactivation (PI) of gram-negative bacteria a cationic photosensitizer is required. This requirement suggests a charge-dependent interaction between the photosensitizer and the gram-negative bacterium, which may be influenced by the presence of ions in the suspending medium.
Lambrechts, Saskia A. G. +4 more
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It is well established that for successful photoinactivation (PI) of gram-negative bacteria a cationic photosensitizer is required. This requirement suggests a charge-dependent interaction between the photosensitizer and the gram-negative bacterium, which may be influenced by the presence of ions in the suspending medium.
Lambrechts, Saskia A. G. +4 more
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Cationic polymerization initiated by substituted vinyl cations in dichloromethane solution
Die Makromolekulare Chemie, Rapid Communications, 1989Polymerisation de: ether butylvinyl, p-methyl-styrene, oxyde de cyclohexene, N-vinylcarbazole et ...
Yusuf Yagci +2 more
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[Modified substitution of intracellular cations].
Der Anaesthesist, 1987In order to ascertain the effect of modified supplementation of electrolytes and trace metals on intracellular uptake, 75 patients undergoing mitral valve replacement were randomly divided into three groups: group A (n = 25) received potassium and sodium chloride while group B (n = 25) was treated with potassium aspartate; in group C (n = 25), a ...
B, von Bormann +6 more
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Journal of the American Chemical Society, 1988
In this study, we calculate the stabilization of /3-substituted ethyl cations (R = H, Li, BeH, BH,. CH,, NH,, OH, F, Na, MgH, A1H2, SiH,, PH2, SH, CI) and a-substituted methyl cations (R = H, Li, CH,, NH,, OH, F, Na, SiH,, PH,, SH, CI) in order to obtain a relationship between the nature of the substituent and the degree of stabilization of the cation.
Julia C. White +2 more
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In this study, we calculate the stabilization of /3-substituted ethyl cations (R = H, Li, BeH, BH,. CH,, NH,, OH, F, Na, MgH, A1H2, SiH,, PH2, SH, CI) and a-substituted methyl cations (R = H, Li, CH,, NH,, OH, F, Na, SiH,, PH,, SH, CI) in order to obtain a relationship between the nature of the substituent and the degree of stabilization of the cation.
Julia C. White +2 more
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