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Toward Ultralow‐Bandgap Liquid Crystalline Semiconductors: Use of Triply Fused Metalloporphyrin Trimer–Pentamer as Extra‐large π‐Extended Mesogenic Motifs
Author(s) -
Tanaka Seiya,
Sakurai Tsuneaki,
Honsho Yoshihito,
Saeki Akinori,
Seki Shu,
Kato Kenichi,
Takata Masaki,
Osuka Atsuhiro,
Aida Takuzo
Publication year - 2012
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201201101
Subject(s) - mesogen , pentamer , trimer , materials science , liquid crystal , crystallography , phase (matter) , porphyrin , band gap , liquid crystalline , chemistry , photochemistry , optoelectronics , organic chemistry , dimer , biochemistry
Abstract In contrast with their dimeric homologue, triply fused zinc porphyrin trimer–pentamer, as extra‐large π‐extended mesogens, assemble into columnar liquid crystals (LCs) when combined with 3,4,5‐tri(dodecyloxy)phenyl side groups ( 3 P Zn – 5 P Zn , Figure 1). Their LC mesophases develop over a wide temperature range, namely, 41–280 °C (on heating) for 5 P Zn , and all adopt an oblique columnar geometry, typically seen in columnar LC materials involving strong mesogenic interactions. These LC materials are characterized by their wide light‐absorption windows from the entire visible region up to a near infrared (NIR) region. Such ultralow‐bandgap LC materials are chemically stable and serve as hole transporters, in which 5 P Zn gives the largest charge carrier mobility (2.4×10 −2 cm V −1 s −1 ) among the series. Despite a big dimensional difference, they coassemble without phase separation, in which the resultant LC materials display essentially no deterioration of the intrinsic conducting properties.