In our previous work, we demonstrated that bismuth and zinc-based homometallic catalysts can be attractive, less toxic alternatives to DBTDL for the synthesis of photocurable ester-urethane macromonomers for elastomeric networks preparation . Here, we aim to investigate heterometallic complexes, because they may offer higher catalytic activity and greater selectivity, as compared to their homometallic analogues . For example, Qi Shen et al. demonstrated that anionic lanthanide-sodium-2,6-di-tert-butyl-phenoxide complexes have much higher activity than those of the corresponding neutral complexes in ring-opening polymerization of ε-caprolactone and trimethyl carbonate .