| abstract |
Embodiments of the present disclosure are directed to metal complexes that can be used to form polymers. As an example, the present disclosure provides a metal complex of formula I, wherein m is zr, hf, or ti; each het is independently a heterocyclic; each 1 is independently a bridging group; each x is independently cl, br, i or alkyl; each R 1 is independently selected from the group including hydrogen, alkalis, alkenis, alkynis, cycloalkyls, aris, acis, alcohols, aryloxy, alkylthio, dialkylamines, alkylamido, alkoxycarbonis, aryloxycarbonis, carbomois, alkyl and dialkylcarbamoyl, acyloxy, acylamino, aroylamines, aromatic rings, fused aromatic rings, and combinations thereof; and each n is independently an integer with a value from one to five. formula i |