unter vollstandiger Minimisierung der Gesamtenergie beziiglich der geometrischen Parameter (Bindungslangen und -winkel) erhalten. Daraus geht die energetische Stabilisierung der Kationen mit zunehmender Methylsubstitution befriedigend hervor. Die positive Ladung am mittleren C-Atom E ER EK Es -0.303 -0.262 -0.286 -0.271 -0.100 -0.082 +0.082 +0.092
C12TeS.7 forms orthorhombic crystals, space group D: ; -Pmnb,a=8.82,b=9.01, c=13.28 A; Z = 4 ; d~-~~~= 2 . 6 5 g/cm3. Preliminary results from an X-ray structure analysis indicate the following structure:The eight-membered ring has the same "crown shape" as the s 8 ring of the cr-[ll and @-modification[2] of sulfur. The Te atom is coordinated as a distorted trigonal bipyramid: The C1 atoms occupy the apices of the pyramids, the lone pair taking up an equatorial position.
Procedure:A solution of "crude sulfane"[31 (20 g) in CS2 (0.5 1) is added dropwise to a stirred solution of TeC14 (20 g) in CHzCI?: (1 1) and CS2 (0.5 1) at room temperature over a period of 4-5 h. About 18 g of C12TeS7 is precipitated; concentration of the filtrate to a volume of 200 ml yields another 2 g of product. Purification is by recrystallization from CSz.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.