Folded accordion polymers

Folded accordion polymers are another example of main-chain polymers with transverse orientation of the chromophore [85, 86],... 

A variation to the head-to-tail main-chain polymer was recently reported by Lindsay and co-workers [135]. In this strategy the polymer backbone is folded into an accordion shape. The long axes of the rigid chromophoric units in these polymers were essentially perpendicular to the axis of the polymer chain the bridging groups were generally U-shaped connections. One of these such-shaped polymers [Structure (16)] L-B films was not SHG active, but a poled polymer with similar structure had a of about 5 pm... 

---