Bisulfide

The Bisulfide ion, also called hydrosulfide, is the anion with the formula [HS] ⁻ (commonly written [SH] ⁻). This species is the conjugate base of hydrogen sulfide::H₂S unicode|⇌ HS⁻ + H⁺In aqueous solutions, at pH greater than 7, hydrogen sulfide is the dominant species; at pH > 7, bisulfide dominates.

A variety of salts are known, including sodium hydrosulfide and potassium hydrosulfide. Ammonium hydrosulfide, a component of "stink bombs" has not been isolated as a pure solid. Some compounds described as salts of the sulfide dianion contain primarily hydrosulfide. For example, the hydrated form of sodium sulfide, nominally with the formula Na₂S·(H₂O)₉, is better described as NaSH·NaOH·(H₂O)₈.Aqueous bisulfide absorbs light at around 230nm in the UV/VIS spectrum [Citation
last1 = Goldhaber | first1 = M. B.
last2 = Kaplan | first2 = I. R.
title = Apparent Dissociation Constants of Hydrogen Sulfide in Chloride Solutions
journal =Marine Chemistry
volume = 3(1)
pages = 83–104
date = 1975] . Groups have used field spectrometers to measure the absorption due to bisulfide (and hence its concentration) continuously in the ocean [Citation
last1 = Johnson
first1 = K. S.
last2 = Coletti
first2 = L. S.
title = In situ ultraviolet spectrophotometery for high resolution and long-term monitoring of nitrate, bromide and bisulfide in the ocean
journal = Deep Sea Research
volume = 1(49)
pages = 1291–1305
date = 2001] [Citation
last1 = Guenther | first1 = E. A. | last2 = Johnson | first2 = K. S. | last3 = Coale | first3 = K. H.
title = Direct Ultraviolet Spectrophotometric Determination of Total Sulfide and Iodide in Natural Waters
journal = Analytical Chemistry
volume = 73
pages = 3481–3487
date = 2001
doi = 10.1021/ac0013812] and in sewage ["In Press" Citation
last1 = Sutherland-Stacey | first1 = L.
last2 = Corrie| first2 = S.
last3 = Neethling | first3 = A.
last4 = Johnson | first4 = I.
last5 = Gutierrez
last6 = Dexter | first6 = R.
last7 = Yuan | first7 = Z.
last8 = Keller | first8 = J.
last9 = Hamilton | first9 = G.
title = Continuous Measurement of Dissolved Sulfide in Sewer Systems
journal = Water Science and Technology
volume =
pages =
date = 2007
unused_data = |first5 O.] . Bisulfide is sometimes confused with the disulfide dianion, S₂²⁻.

Coordination chemistry

SH⁻ is a soft anionic ligand that forms complexes with most metal ions. Examples include [Au(SH)₂] ⁻ and (C₅H₅)₂Ti(SH)₂, derived from gold(I) chloride and titanocene dichloride, respectively. [cite journal | author = Peruzzini, M.; de los Rios, I. and Romerosa, A. | title = Coordination Chemistry of Transition Metals with Hydrogen Chalcogenide and Hydrogen Chalcogenido Ligands | journal = Progress in Inorganic Chemistry | volume = 49 | pages = 169–543 | year = 2001 | doi = ]

References