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・ Sodium sulfate
・ Sodium sulfate (data page)
・ Sodium sulfate symporter
・ Sodium sulfide
・ Sodium sulfite
・ Sodium superoxide
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Sodium tetrasulfide
・ Sodium tetrathionate
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・ Sodium thiocyanate
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・ Sodium triacetoxyborohydride
・ Sodium triethylborohydride
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・ Sodium trimetaphosphate
・ Sodium triphosphate
・ Sodium tungstate
・ Sodium tungsten bronze
・ Sodium uranate
・ Sodium vanadate


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Sodium tetrasulfide : ウィキペディア英語版
Sodium tetrasulfide

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Sodium tetrasulfide is an inorganic compound with the formula Na2S4. It is a yellow-orange solid that dissolved with hydrolysis in water.〔Handbook of Preparative Inorganic Chemistry, 2nd Ed. Edited by G. Brauer, Academic Press, 1963, NY. Vol. 1. p. 365.〕 They are precursors to some specialty polymers and intermediates in prototypes of the sodium-sulfur battery.
==Synthesis and structure==
It is produced through the reaction between elemental sulfur and sodium hydrosulfide in alcoholic solution:
:2NaSH + 4 S → Na2S4 + H2S
The polysulfide anions adopt zig-zag chains of sulfur atoms. The S-S distances are about 2.05 Å and the S-S-S-S dihedral angles are around 90°.〔R. Tegman "The crystal structure of sodium tetrasulphide, Na2S4" Acta Cryst. (1973). B29, 1463-1469 〕

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