Synthesis and Crystal Structure of Novel Biheterometal and Triheterometal Alkoxide Clusters – Highly Active Catalysts for the Polymerization of ϵ-Caprolactone

✍ Scribed by Hongting Sheng; Yan Feng; Yong Zhang; Qi Shen

• Publisher: John Wiley and Sons
• Year: 2010
• Tongue: English
• Weight: 558 KB
• Volume: 2010
• Category: Article
• ISSN: 1434-1948
• DOI: 10.1002/ejic.201000831

✦ Synopsis

The effect of the alkali metal on the synthesis, crystal structure, and catalytic reactivity of lanthanide-alkali metal alkoxide clusters is reported. Anhydrous LnCl 3 reacts with 6.5 equiv. of KOCH 2 CH 2 N(CH 3 ) 2 and 1.5 equiv. of KOH in tetrahydrofuran (THF) to give the corresponding lanthanidepotassium biheterometal alkoxide clusters [Ln 4 K 20 -(OCH 2 CH 2 NMe 2 ) 26 (OH) 6 ] [Ln = Nd (1), Pr (2), Yb (3)] in high yield. Anhydrous YbCl 3 reacts with KOCH 2 CH 2 N(CH 3 ) 2 and NaOH with different molar ratios of 1:9:3 and 1:9:4 to afford the lanthanide-potassium-sodium triheterometal alkoxide clusters [Yb 2 K 10 Na 6 (OCH 2 CH 2 NMe 2 ) 18 (OH) 4 ] (4) and [Yb 2 -K 8 Na 8 (OCH 2 CH 2 NMe 2 ) 18 (OH) 4 ] (5), respectively. These