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The Global ETD Search service is a free service for researchers
to find electronic theses and dissertations. This service is
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Networked Digital Library of Theses and Dissertations.
Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
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Showing 1 to 2 of 2 (0.026 seconds)Spelling suggestions: "subject:"pseudosymmetrie"" "subject:"pseudosymmetric""
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Ba(BO2OH) – A Monoprotonated Monoborate from Hydroflux Showing Intense Second Harmonic GenerationLi, Yuxi, Hegarty, Peter A., Rüsing, Michael, Eng, Lukas M., Ruck, Michael 30 May 2024 (has links)
Pure samples of colorless, air-stable Ba(BO2OH) crystals were obtained from Ba(NO3)2 and H3BO3 under the ultra-alkaline conditions of a KOH hydroflux at about 250 °C. The product formation depends on the water-base molar ratio and the molar ratio of the starting materials. B(OH)3 acts as a proton donor (Brønsted acid) rather than a hydroxide acceptor (Lewis acid). Ba(BO2OH) crystallizes in the non-centrosymmetric orthorhombic space group P212121. Hydrogen bonds connect the almost planar (BO2OH)2− anions, which are isostructural to HCO3−, into a syndiotactic chain. IR and Raman spectroscopy confirm the presence of hydroxide groups, which are involved in weak hydrogen bonds. Upon heating in air to about 450 °C, Ba(BO2OH) dehydrates to Ba2B2O5. Moreover, the non-centrosymmetric structure of Ba(BO2OH) crystals was verified with power-dependent confocal Second Harmonic Generation (SHG) microscopy indicating large conversion efficiencies in ambient atmosphere.
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Structural and biochemical characterization of diheme <i>c</i>-type cytochromes / Strukturelle und biochemische Charakterisierung von dihäm <i>c</i>-Typ CytochromenHeitmann, Daniel 24 October 2008 (has links)
No description available.
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