Clusters on Clusters: closo-Dodecaborate as a Ligand for Au55 Clusters

✍ Scribed by Günter Schmid; Raphaël Pugin; Wolfgang Meyer-Zaika; Ulrich Simon

• Publisher: John Wiley and Sons
• Year: 1999
• Tongue: English
• Weight: 433 KB
• Volume: 1999
• Category: Article
• ISSN: 1434-1948
• DOI: 10.1002/(sici)1099-0682(199911)1999:11<2051::aid-ejic2051>3.0.co;2-o

✦ Synopsis

The exchange of PPh 3 in Au 55 (PPh 3 ) 12 Cl 6 by Na 2 [B 12 H 11 SH] properties of 2 and 4 are compared with those of Au 55 [Ph 2 PC 6 H 4 SO 3 N(octyl) 4 ] 12 Cl 6 (3), the ammonium using a phase-transfer reaction from CH 2 Cl 2 to water needs 6 weeks for reaction, but finally results in the quantitative derivative of the sodium salt. Cluster 3 shows the expected increase of activation energy in the temperature range of formation of Au 55 [(B 12 H 11 SH)Na 2 ] 12 Cl 6 (2). Cluster 2, which is of considerable stability in aqueous solution, has been 130-250 K owing to the increase of cluster spacing compared with the sodium derivative. However, clusters 2 and 4, show characterized by 1 H-NMR, 11 B-NMR, and IR spectroscopy as well as by transmission electron microscopy (TEM). The Na + electromigration in the electric field, caused by the huge amount of ionic charges in the ligand shell. cations can be exchanged by (octyl) 4 N + making the resulting cluster 4 soluble in polar organic solvents. The electrical [a] Institut für Anorganische Chemie, Universität Essen the lability of the triphenylphosphane coordinated to the