Coordinatively Unsaturated Metal Centers as Building Blocks for High Coordination Number Metallomesogens

✍ Scribed by Koen Binnemans; Katleen Lodewyckx

• Publisher: John Wiley and Sons
• Year: 2001
• Tongue: English
• Weight: 166 KB
• Volume: 113
• Category: Article
• ISSN: 0044-8249
• DOI: 10.1002/1521-3757(20010105)113:1<248::aid-ange248>3.0.co;2-j

✦ Synopsis

Most literature on metal-containing liquid crystals (metallomesogens) is devoted to compounds with Rh I , Ir I , Ni II , Pd II , Pt II , Cu II , and Ag I as the central metal ion, because these complexes have a linear or planar geometry and mimic therefore conventional organic calamitic (rodlike) liquid crystals. [1] Obtaining high coordination number calamitic metallomesogens is a challenge. [2] One approach is to make the ligand as anisometric as possible by increasing the number of aromatic rings. [3, 4] The design of lanthanide-containing liquid crystals is difficult [5] because the trivalent lanthanide ions have even 0.22 mmol) was heated to reflux with stirring for 1 d. After cooling, the solvent was removed in vacuo. The residue was purified by column chromatography on silica gel (CH 2 Cl 2 /ethanol (30/1) as eluent). Yield: 128 mg (59 %).