A New Route to Crystalline Salts of the Hydrolytic Dimer of Chromium(III)

✍ Scribed by Thomas Merakis; Annette Murphy; Leone Spiccia; Alan Beguin; Werner Marty

• Publisher: John Wiley and Sons
• Year: 1989
• Tongue: German
• Weight: 195 KB
• Volume: 72
• Category: Article
• ISSN: 0018-019X
• DOI: 10.1002/hlca.19890720516

✦ Synopsis

Crystalline salts of the hydrolytic dimer of Cr(III), [Cr2(p-OH),(H,O),1X,.n H 2 0 (X =p-toluenesulfonate (tos) or mesitylene-2-sulfonate (dmtos)) have been prepared in good yields via a simple two-step procedure: Ht oxidation of Cr metal to give Cr2+ (T 5 70") followed by O2 oxidation, of Cr2+ to give the dimer ( T % 25'). The mechanism of conversion of Cr2+ into the dimer is discussed. 'active' dimer hydroxide [l]. It is also better suited for the preparation of dimer solutions in perchlorate media than methods based on reduction of Cr3+ with Zn amalgam to give Cr2+ followed by 0, oxidation to the dimer [15].