Date Published: August 01, 2009
Publisher: International Union of Crystallography
Author(s): Mon-Wei Hsiao, Chu-Chieh Lin.
In the title centrosymmetric dimeric ZnII complex, [Zn2(C27H27N4O)2(C7H7O)2], the ZnII center is coordinated by two N atoms and one O atom of the ketiminate ligand and two bridging O atoms of the benzylalkoxy groups. The geometry around the ZnII ions is distorted trigonal-bipyramidal.
For the potential applications of polyesters, see: Gref et al. (1994 ▶); Jeong et al. (1997 ▶). Many zinc complexes with various ligands are effective initiators/catalysts for the ring-opening polymerization (ROP) of cyclic esters, see: Chamberlain et al. (2001 ▶); Williams et al. (2003 ▶); Dechy-Cabaret et al. (2004 ▶); Chen et al. (2005 ▶); Wu et al. (2006 ▶); Huang et al. (2009 ▶); Hung et al. (2008 ▶). Tripodal tridentate ligand-supported zinc complexes have been used for the polymerization of lactides, see: Chisholm et al. (2000 ▶). Recently, a series of zinc alkoxides (Yu et al., 2002 ▶; Lee et al., 2007 ▶) coordinated with simple N,N,O-tridentate ketiminate ligands has been synthesized and these derivatives showed highly catalytic activity with regard to the ROP of lactides. For Zn—O and Zn—N distances in other zinc ketiminate complexes, see: Hung & Lin (2009 ▶).