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1900 3 ) , zinkenite , jamesonite , and boulangerite . Antimony pentasulfide is non @-@ stoichiometric and features antimony in the + 3 oxidation state and S @-@ S bonds . Several thioantimonides are known , such as [ Sb
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1901 6S
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1902 10 ] 2 − and [ Sb
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1903 8S
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1904 13 ] 2 − .
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1905 = = = Halides = = =
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1906 Antimony forms two series of halides : SbX
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1907 3 and SbX
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1908 5 . The trihalides SbF
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1909 3 , SbCl
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1910 3 , SbBr
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1911 3 , and SbI
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1912 3 are all molecular compounds having trigonal pyramidal molecular geometry .
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1913 The trifluoride SbF
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1914 3 is prepared by the reaction of Sb
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1915 2O
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1916 3 with HF :
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1917 Sb
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1918 2O
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1919 3 + 6 HF → 2 SbF
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1920 3 + 3 H
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1921 2O
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1922 It is Lewis acidic and readily accepts fluoride ions to form the complex anions SbF −
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1923 4 and SbF2 −
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1924 5 . Molten SbF
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1925 3 is a weak electrical conductor . The trichloride SbCl
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1926 3 is prepared by dissolving Sb
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1927 2S
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1928 3 in hydrochloric acid :
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1929 Sb
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1930 2S
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1931 3 + 6 HCl → 2 SbCl
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1932 3 + 3 H
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1933 2S
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1934 The pentahalides SbF
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1935 5 and SbCl
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1936 5 have trigonal bipyramidal molecular geometry in the gas phase , but in the liquid phase , SbF
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1937 5 is polymeric , whereas SbCl
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1938 5 is monomeric . SbF
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1939 5 is a powerful Lewis acid used to make the superacid fluoroantimonic acid ( " H2SbF7 " ) .
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1940 Oxyhalides are more common for antimony than arsenic and phosphorus . Antimony trioxide dissolves in concentrated acid to form oxoantimonyl compounds such as SbOCl and ( SbO )
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1941 2SO
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1942 4 .
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1943 = = = Antimonides , hydrides , and organoantimony compounds = = =
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1944 Compounds in this class generally are described as derivatives of Sb3 − . Antimony forms antimonides with metals , such as indium antimonide ( InSb ) and silver antimonide ( Ag
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1945 3Sb ) . The alkali metal and zinc antimonides , such as Na3Sb and Zn3Sb2 , are more reactive . Treating these antimonides with acid produces the unstable gas stibine , SbH
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1946 3 :
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1947 Sb3 − + 3 H + → SbH
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1948 3
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1949 Stibine can also be produced by treating Sb3 + salts with hydride reagents such as sodium borohydride.Stibine decomposes spontaneously at room temperature . Because stibine has a positive heat of formation , it is thermodynamically unstable and thus antimony does not react with hydrogen directly .