The crystal structure of pararealgar, As₄S₄

Abstract

Other| April 01, 1995 The crystal structure of pararealgar, As4S4 Paola Bonazzi; Paola Bonazzi Universita di Firenze, Dipartimento di Scienze della Terra, Florence, Italy Search for other works by this author on: GSW Google Scholar Silvio Menchetti; Silvio Menchetti Search for other works by this author on: GSW Google Scholar Giovanni Pratesi Giovanni Pratesi Search for other works by this author on: GSW Google Scholar American Mineralogist (1995) 80 (3-4): 400–403. https://doi.org/10.2138/am-1995-3-422 Article history first online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Twitter LinkedIn Tools Icon Tools Get Permissions Search Site Citation Paola Bonazzi, Silvio Menchetti, Giovanni Pratesi; The crystal structure of pararealgar, As4S4. American Mineralogist 1995;; 80 (3-4): 400–403. doi: https://doi.org/10.2138/am-1995-3-422 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu nav search search input Search input auto suggest search filter All ContentBy SocietyAmerican Mineralogist Search Advanced Search Abstract Pararealgar, a polymorph of realgar (α-As4S4), crystallizes in the monoclinic space group P21/C, with a = 9.909(2), b = 9.655(1), c = 8.502(1) Å, 0 = 97.29(1)°, V = 806.8(2) Å3. A single crystal of pararealgar was obtained by light exposure of realgar. The structure was determined by direct methods and refined by least-squares technique to a final R index of 3.39%. The structure consists of discrete covalently bonded As4S4 molecules, which are held together by van der Waals forces. In each molecule, one As atom links 2As + 1S, another links 3S, and the other two link 1As + 2S. Therefore this molecule differs from that of α-As4S4 but is the same as that found in As4S4(II). The difference between the structure of pararealgar and As4S4(II) is due to different molecular packing. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not currently have access to this article.