Frontispiece: Mixed Allyl Rare‐Earth Borohydride Complexes: Synthesis, Structure, and Application in (Co‐)Polymerization Catalysis of Cyclic Esters

Abstract

Such rare‐earth (RE) complexes (RE=La, Nd, Sm, Y, Sc) contain allyl and borohydride groups that are both potential initiators towards the ring‐opening polymerization of cyclic esters. They display high activity towards homo‐ and co‐polymerization of l‐LA and ϵ‐CL, producing a wide range of copolymers. The borohydride moiety is shown to preferentially initiate the polymerization. For more information see the Full Paper by F. Bonnet, M. Visseaux et al. on page 15644 ff.

Precise Microstructure Control in Poly(hydroxybutyrate-co-lactic Acid) Copolymers Prepared by an Yttrium Amine Bis(phenolate) Complex

“…Therefore, we reasoned that combining these two features (as in 1 ) should provide an initiator with enhanced activity in rac -β-BL ROP versus rac -LA ROP and provide copolymer structures that deviated from a blocky microstructure. The strategies of selecting an initiator with high reactivity toward the homopolymerization of the less reactive monomer to enable more favorable competition between monomers in copolymerizations and use of bulky substituents in the coordination sphere of the metal to reduce the coordination ability of LA , have both been used successfully in LA/ε-caprolactone copolymerizations to favor the formation of statistical copolymers.…”

Construction of three types of lanthanide complexes based on 3,4‐dimethylbenzoic acid and 5,5′‐dimethyl‐2,2′‐bipyridine: Syntheses, Structures, Thermodynamic properties, Luminescence, and Bacteriostatic activities

“…The most important crystallographic data and selected bond length for the monocrystalline complexes were listed in Tables and , respectively. Obviously, the structures are quite different: the complex 1 is mononuclear molecule with three 3,4‐DMBA − ligands, one 5,5′‐DM‐2,2′‐bipy ligand, one Er (III) ion and one coordination water, and the molar ratio of each molecule is 3:1:1:1; complex 2 is binuclear molecule with six 3,4‐DMBA − ligands, two 5,5′‐DM‐2,2′‐bipy ligands, two Tb (III) ions and one coordination water, that is to say, the molar ratio of each molecule is 6:2:2:1; while complex 3 is binuclear molecule with six deprotonated 3,4‐DMBA − ligands, two unprotonated 3,4‐DMHBA ligand, two 5,5′‐DM‐2,2′‐bipy ligands and two Eu (III) ions, in the end, the molar ratio of each molecule is 3:1:1:1 . In order to make a comparison, the structures of single‐crystal complexes 1 – 3 will be described in detail, respectively.…”