Fig. 2: Synthetic routes for the SiO-bridged ladder-type π-skeletons.

a The route for producing ladder-type π-skeleton SiO5T-5. b The route for producing ladder-type π-skeleton SiO5T-10.

a The route for producing ladder-type π-skeleton SiO5T-5. b The route for producing ladder-type π-skeleton SiO5T-10.