Hans Engelkamp, Cornelis F. van Nostrum, Roeland J. M. Nolte, Hans Engelkamp, Cornelis F. van Nostrum and Stephen J. Picken
The phthalocyanine units in a new optically active phthalocyaninatopolysiloxane are arranged in a rigid helical structure, providing a new kind of main-chain chirality in polymers.