Structure D 2000 SrSi 6 N 8 -A Reduced Nitridosilicate with a Si-Si Bond. -Single crystals of the title compound are obtained from the reaction of Sr with Si(NH)2 at 1650°C (N2 atmosphere, tungsten crucible, r.f. furnace, 6.5 h). SrSi6N8 crystallizes in the orthorhombic space group Imm2 with Z = 2. The structure contains SiN4 tetrahedra as well as N3Si-SiN3 units with Si-Si single bonds of 235.2 pm lengths. The compound represents the first ternary silicate with a partially reduced silicate substructure in which Si is present in the oxidation states +3 and +4. -(STADLER, F.; OECKLER, O.; SENKER, J.; HOEPPE, H. A.; KROLL, P.; SCHNICK*, W.; Angew. Chem., Int. Ed. 44 (2005) 4, 567-570; Fachbereich Chem. Biochem.,
Europium I 3400Crystal Structure, Physical Properties and HRTEM Investigation of the New Oxonitridosilicate EuSi2O2N2. -The new layered title compound is synthesized from a mixture of Eu2O3 and Si(NH)2 (1400°C, r.f. furnace, 40 h). The compound crystallizes in the triclinic space group P1 with Z = 4. Its anionic Si2O2 layers consist of corner-sharing SiON3 tetrahedra with threefold connecting nitrogen and terminal oxygen atoms. Magnetic susceptibility measurements show Curie-Weiss behavior above 20 K with an effective magnetic moment of 7.80 µB/Eu, indicating divalent europium. Luminescence measurements show a narrow emission band with regard to the four crystallographic europium sites with an emission maximum at 575 nm. -(STADLER, F.; OECKLER, O.; HOEPPE, H. A.; MOELLER, M. H.; POETTGEN, R.; MOSEL, B. D.; SCHMIDT, P.; DUPPEL, V.; SIMON, A.; SCHNICK*, W.; Chem. Eur. J. 12 (2006) 26, 6984-6990; Fachbereich Chem. Biochem.,
Single-Walled Carbon Nanotubes Filled with MOH (M: K, Cs) and Then Washed and Refilled with Clusters and Molecules. -MOH-filled (M: K, Cs) single-walled carbon nanotubes (SWNT) are synthesized in good yield (ca. 20-30%) by heating SWNTs with molten MOH (573-723 K, 4 h). The samples are characterized by TEM. The hydroxide filling is removed by treatment with water at room temperature. The resulting SWNTs are then refilled using aqueous solutions of UO 2 (OAc) 2 or UO 2 (NO 3 ) 2 at room temperature giving SWNTs filled with UO2 clusters and uranyl acetate molecules. -(THAMAVARANUKUP, N.; HOEPPE, H. A.; RUIZ-GONZALEZ, L.; COSTA, P. M. F. J.; SLOAN*, J.; KIRKLAND, A.; GREEN, M. L. H.; Chem.
Layer Silicate. -Colorless lath-shaped single crystals of the title compound are synthesized by reaction of CaCO3 with Si3N4 at 1580°C in a radio frequency furnace. As revealed by single crystal XRD, Ca[Si2O2N2] crystallizes in the monoclinic space group P21 with Z = 12. The compound is a layer silicate composed of SiON3 tetrahedra. Every N atom links three neighboring Si tetrahedral centers, whereas the O atoms are exclusively bonded terminally to Si atoms. -(HOEPPE, H. A.; STADLER, F.; OECKLER, O.; SCHNICK*, W.; Angew. Chem., Int. Ed. 43 (2004) 41, 5540-5542; Fachbereich Chem.,
Die Untersuchung von Terpenen und ihren Derivaten, hauptsächlich aus der Carvonund Campher‐Reihe, auf ihre bakteriostatische, fungistatische und verminoxe Aktivität ergibt, daß sich beim Carvon die bakteriostatische und venninoxe Wirkun durch Halogenierung steigem läßt. Die Hydrierung und Blockierung von Ketogruppen hat eine Abschwächung der bakteriostatischen und fungistatischen Aktivität zur Folge.
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