High‐Temperature Ferromagnetism of a Discotic Liquid Crystal Dilutely Intercalated with Iron(III) Phthalocyanine

Abstract

Room-temperature ferromagnetism of an organic discotic liquid crystalline compound (DLC) is achieved by intercalation at low levels with paramagnetic iron(III) phthalocyanine (see figure). These ferromagnetic DLCs are very similar to the so-called dilute magnetic semiconductors of inorganic nature. It is expected that this novel approach will open up a new way of preparing the high-temperature organic ferromagnetic compounds needed for molecular spintronics.

Twofold Light and Magnetic Responsive Behavior in Nanoparticle–Lyotropic Liquid Crystal Systems

“…Hybrid complex fluids composed of liquid crystals and nanoparticles are intriguing materials both for fundamental research and industrial applications. It has been shown that devices can be engineered from these hybrid systems with unique electronic, optical, thermal, and mechanical properties, showing great potential in optoelectronic devices, magnetic storage, actuators, catalysis, and in the biomedical field. , To fully exploit the potential of these systems in real applications, the possibility of controlling their structural and physical properties via external stimuli is a highly desired feature…”

Organische Chemie 2010

“…Über lyotrope, flüssigkristalline Eigenschaften einer Mischung von vier kleinen miteinander supramolekular wechselwirkenden Bausteinen (3,6‐Di‐(4‐pyridyl)‐pyridazin‐4,5‐dicarbonsäurediethyl‐ester, Tris(4‐pyridyl)‐2,4,6‐triazin, Triphenylen, (en)Pd(NO3)2) in wässriger Lösung berichteten Fujita, Kato et al20 Dieses Verhalten wurde auf die Selbstorganisation zu komplexen kolumnaren Segmenten zurückgeführt. Die Mischung von metallfreien Phthalocyaninmesogenen und Eisen(III)phthalocyanin ergab magnetische LC‐Materialien, die bei Raumtemperatur eine ferromagnetische Hysterese zeigten 21. Letztere wurde jedoch nur bei niedrigen Eisen(III)phthalocyaninkonzentrationen festgestellt, weshalb Jin et al annehmen, dass die kolumnar flüssigkristalline Ordnung des LC‐Halbleiters eine entscheidende Rolle für die ferromagnetischen Eigenschaften spielt.…”

Comparative Investigation of Peripheral and Nonperipheral Zinc Phthalocyanine-Based Polycarbazoles in Terms of Optical, Electrical, and Sensing Properties

“…20−22 These kinds of compounds possess intense bluegreen color due to the electronic delocalization of their 18-π electrons. These properties caused them to be initially utilized in various fields such as photosensitizers in photodynamic therapy, 23−26 chemical and biosensors, 27−30 catalysts, 31 liquid crystals, 32,33 and sensitizers in photodynamic therapy. 34−37 Recently, we have focused our research on the synthesis, characterization, electropolymerization, and electro-optic and biosensor application of peripherally octa-substituted carbazole zinc phthalocyanine.…”

“…Peripheral or nonperipherally functionalized phthalocyanines have been investigated in a variety of areas because of their numerous properties such as chemical and thermal stability that possess unique physical and chemical properties. − These kinds of compounds possess intense blue-green color due to the electronic delocalization of their 18-π electrons. These properties caused them to be initially utilized in various fields such as photosensitizers in photodynamic therapy, − chemical and biosensors, − catalysts, liquid crystals, , and sensitizers in photodynamic therapy. − …”