title: Experimental and theoretical evidence for HS4.
abstract: The new radical HS(4) containing three sulfur-sulfur bonds has been detected in the gas phase by mass spectrometric experiments. Structures and energies of HS(4) in the three oxidation states +/0/- have been investigated by ab initio calculations. HS(4) is characterized by the HSSSS open-chain structure, and it is stable toward dissociation into S(2) and HS(2) by 23 kcal mol(-1). The first detection of HS(4)(-), the conjugate base of the strong acid H(2)S(4) is also reported.
authors: Dipartimento di Chimica e Tecnologie del Farmaco, Università La Sapienza, Piazzale Aldo Moro, 5-00185 Rome, Italy. giulia.depetris@uniromal.it
authors: Giulia
authors: G
authors: de Petris
authors: Antonella
authors: A
authors: Cartoni
authors: Romano
authors: R
authors: Cipollini
authors: Marzio
authors: M
authors: Rosi
authors: Anna
authors: A
authors: Troiani
mesh_terms: D005609:Free Radicals / Q000737:chemistry; D006860:Hydrogen Bonding; D011789:Quantum Theory; D013455:Sulfur; D013457:Sulfur Compounds / Q000737:chemistry*; D013816:Thermodynamics
chemical_list: D005609:Free Radicals; D013457:Sulfur Compounds; D013455:Sulfur