Synthesis and characterization of lithium and yttrium complexes containing tridentate pyrrolyl ligands. Single-crystal X-ray structures of {Li[C 4H 2N(CH 2NMe 2) 2-2,5]} 2 ( 1) and {[C 4H 2N(CH 2NMe 2) 2-2,5]YCl 2(μ-Cl) · Li(OEt 2) 2} 2 ( 2) and ring-opening polymerization of ε-caprolactone

Abstract

The lithiated pyrrolyl ligand, {Li[C 4H 2N(CH 2NMe 2) 2-2,5]} 2 ( 1) was synthesized and structurally characterized. Reaction of 1 with YCl 3 in the molar ratio 1:1 in diethyl ether at room temperature afforded a di-yttrium di-lithium tetranuclear complex, {[C 4H 2N(CH 2NMe 2) 2-2,5]YCl 2(μ-Cl) · Li(OEt 2) 2} 2 ( 2) in 87% yield. Compounds 1 and 2 were characterized by NMR spectroscopy and single crystal X-ray crystallography. Compound 1 shows high reactivity for the ring-opening polymerization of ε-caprolactone.