Coordination Chemistry of Open-Ring Hemiporphyrazines

Abstract

Hemiporphyrazines, phthalocyanine analogues consisting of two isoindoline subunits and two pyridine or other aromatic subunits, have attracted considerable interest not only from the viewpoint of their fundamental properties but also in materials science. Since the first report on hemiporphyrazine about 70 years ago, various types of hemiporphyrazines have been synthesized to date. However, when comparing the rich chemistry of porphyrins and other porphyrinoids, the structural diversity of hemiporphyrazines and azaporphyrinoids is still limited. In particular, much less attention has been paid for acyclic hemiporphyrazines, which is in sharp contrast to many reports on acyclic porphyrinoids. Herein we report synthesis of open-ring hemiporphyrazines and their coordination chemistry. Helical metal complexes (1M ) and dinuclear metal complexes ((2M)2 ) were obtained depending on the terminal subunit of the open-hemiporphyrazine ligands. The effects of the central metal ion on molecular and electronic structures will be discussed in the presentation. Figure 1