synthesis and x-ray crystal structure of the first pure and air-stable salt of peroxymonosulphuric acid (ph)4phso5合成和x射线晶体结构的第一个纯和air-stable盐peroxymonosulphuric酸(ph)4 phso5.pdf

Molecules 2000, 5, 886-894 molecules ISSN 1420-3049 Synthesis and X-Ray Crystal Structure of the First Pure and Air-Stable Salt of Peroxymonosulphuric Acid: (Ph) PHSO 4 5 1 2 Sandro Campestrini * and Marco Crisma 1Università di Padova, Dipartimento di Chimica Organica, Centro CNR di Studio sui Meccanismi di Reazioni Organiche, Via Marzolo 1, 35131 Padova, Italia Fax: +39 49 8275239, E-mail: scampestrini@chor.unipd.it 2Università di Padova, Dipartimento di Chimica Organica, Centro CNR di Studio sui Biopolimeri, Via Marzolo 1, 35131 Padova, Italia Fax: +39 49 8275239, E-mail: biop02@pdchor.chor.unipd.it Received: 10 May 2000 / Accepted: 21 June 2000 / Published: 28 June 2000 Abstract: In this paper we describe the synthesis of tetraphenylphosphonium peroxy- monosulphate, its crystal structure and packing mode. The asymmetric unit accomodates two independent molecules of the monopersulphate anion, which are held together by hydrogen bonds. In the packing mode, rows of such dimers are surrounded by four rows of tetraphenyl ¯ cations. The consequence is that the highly water sensitive HSO5 anions are segregated in- side hydrophobic channels composed by the lipophilic cations. This circumstance presumably accounts for the exceptional stability of the title compound. Keywords: Monopersulphate, X-Ray Crystallography, Oxidation. Introduction Peroxymonosulphuric acid (1) (Caro’s acid)