Structural , spectroscopic and passivation properties of a novel binuclear clamshell-type zinc ( II ) phthalocyanine as gate dielectric for OFET

This issue of JPP is dedicated to Professor Kazuchika Ohta on the occasion of his retirement in the end of March 2018. It consists of 28 original research papers presented by his colleagues and friends. Professor Ohta is a very ingenious scientist. He developed a new field of metal-containing liquid crystals, namely metallomesogens in 1978. His continual creativity has brought about a number of phthalocyaninebased liquid crystals with original molecular and phase structures showing unique properties. The cover picture shows the spiranthes-like supra molecular structure of some selected phthalocyanine-fullerene dyads that were designed and characterized by Professor Ohta. From precise analysis of the SAXS and CD spectra, he established the helical structure of fullerenes in the Colho mesophase. Fullerenes pile up in left-handed and right-handed helicity in a ratio of 50:50. This helical structure resembles spiranthes flower. The helical stacking of C60 moieties is very favorable as an electron carrier path. About the Cover