96.1 Star FM
96.1 Star FM (ACMA callsign: 5SEF) is an Australian commercial radio station based in Mount Gambier, South Australia, owned by Southern Cross Austereo. It commenced broadcasting on May 16, 1998. Currently, the only local program broadcast on the station is the Jess and Ryan breakfast show from 6am to 9am Monday to Friday - all other programming is broadcast from Albury or Gold Coast.
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Selenium hexafluoride
Selenium hexafluoride is the inorganic compound with the formula SeF6. It is a colourless gas described as having a "repulsive" odor. It is not widely encountered and has no commercial applications.
Structure, preparation, and reactions
Like many compounds of selenium, SeF6 is hypervalent. The compound has octahedral molecular geometry with Se-F bond length 168.8 pm.
SeF6 can be prepared from the elements or by the reaction of bromine trifluoride (BrF3) with selenium dioxide. The crude product is purified by sublimation.
The relative reactivity of the hexafluorides of S, Se, and Te follows the order TeF6 > SeF6 > SF6, the latter being completely inert toward hydrolysis until high temperatures. SeF6 also resists hydrolysis. The gas can be passed through 10% NaOH or KOH without change, but reacts with gaseous ammonia at 200 °C.
Safety
Although selenium hexafluoride is quite inert and slow to hydrolyze, it is toxic even at low concentrations, especially by longer exposure. In the U.S., OSHA and ACGIH standards for selenium hexafluoride exposure is an upper limit of 0.05 ppm in air averaged over an eight-hour work shift. Additionally, selenium hexafluoride is designated as IDLH chemical with a maximum allowed exposure limit of 2 ppm.
Selenium tetrafluoride
Selenium tetrafluoride (SeF4) is an inorganic compound. It is a colourless liquid that reacts readily with water. It can be used as a fluorinating reagent in organic syntheses (fluorination of alcohols, carboxylic acids or carbonyl compounds) and has advantages over sulfur tetrafluoride in that milder conditions can be employed and it is a liquid rather than a gas.
Synthesis
The first reported synthesis of selenium tetrafluoride was by Paul Lebeau in 1907, who treated selenium with fluorine:
A synthesis involving more easily handled reagents entails the fluorination of selenium dioxide with sulfur tetrafluoride:
An intermediate in this reaction is seleninyl fluoride (SeOF2).
Other methods of preparation include fluorinating elemental selenium with chlorine trifluoride:
Structure and bonding
Selenium in SeF4 has an oxidation state of +4. Its shape in the gaseous phase is similar to that of SF4, having a see-saw shape. VSEPR theory predicts a pseudo-trigonal pyramidal disposition of the five electron pairs around the selenium atom. The axial Se-F bonds are 177 pm with an F-Se-F bond angle of 169.2°. The two other fluorine atoms are attached by shorter bonds (168 pm), with an F-Se-F bond angle of 100.6°. In solution at low concentrations this monomeric structure predominates, but at higher concentrations evidence suggests weak association between SeF4 molecules leading to a distorted octahedral coordination around the selenium atom. In the solid the selenium center also has a distorted octahedral environment.
Leven
Leven can refer to:
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Pokémon Colosseum
Pokémon Colosseum (ポケモンコロシアム, Pokemon Koroshiamu) is a role-playing video game developed by Genius Sonority and published by Nintendo as part of the Pokémon series. It was released exclusively for the GameCube on November 21, 2003, in Japan; March 22, 2004, in North America; and May 14, 2004, in Europe. Unlike previous titles, the game does not feature random encounters with Pokémon; instead, the player can steal ("snag") the Pokémon of other Pokémon Trainers. The game also features several battle modes for single-player and multiplayer gameplay.
The game is set in the desertous region of Orre. The player protagonist is Wes, a former member of Team Snagem. Throughout the game, the player rescues "Shadow Pokémon"—Pokémon who have had their hearts darkened by Cipher, an antagonistic organization—via snagging. Rui, a non-player girl, serves as Wes's sidekick and identifies Shadow Pokémon.
Pokémon Colosseum was exhibited at E3 2003. North American pre-orders were packaged with a bonus disc that allows the player to download the Pokémon Jirachi. Upon release, the game was generally well-received, with praise directed at its graphics and music. It was a commercial success, with 1.5 million copies sold in the United States and 656,270 in Japan.
Leven, Manitoba, railway station
Leven Railway Station is a flag stop station in Leven, Manitoba, Canada. The stop is served by Via Rail's Winnipeg – Churchill train.
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