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Liquid crystalline dendritic metalloporphyrins formed via 'click' chemistry: Light-harvesting and hole-transporting systems

AutorConcellón, Alberto; Barberá, Joaquín; Marcos, Mercedes; Romero, Pilar ; Serrano, José Luis; Termine, Roberto; Golemme, Attilio
Fecha de publicación2016
Citación6th EuCheMS (2016)
ResumenThe field of branched and globular polymers such as dendrimers has attract considerable attention because their special architecture has found use in specialized applications, for example, target drug delivering, sensors, optoelectronics or light harvesting systems. In addition, liquid crystal dendrimers present an appealing tool for the preparation of functional materials as they combine the dendritic properties with the self-organization into liquid crystalline phases. In previous works, we studied new families of liquid crystal dendrimers, prepared by hydrogen bonding between a triazine core and three peripherial bifunctional dendrons containing a carboxyl group at their focal point, and carbazole, coumarin and pyrene groups. The photoconductivity of these materials was studied and it was concluded that this type of dendritic systems may be useful in the preparation of polymeric materials for optoelectronic applications. As a continuation of our research in this area, and encouraged by the improvement on the preparation of ordered materials with photophysical and electrochemical properties, we report this time a new class of discotic liquid crystalline porphyrin-core dendrimers which have 12 (first generation) or 24 (second generation) coumarin or carbazole functional units around the porphyrin core (see Figure). The chemical structures were confirmed by IR, NMR and MS. The liquid crystalline properties were studied by DSC, POM and X-ray diffraction. The optical, photoluminescence, electrochemical and charge transport properties were also investigated. All synthesized dendrimers showed mesogenic behavior. The charge mobilities are among the highest values reported for discotic liquid crystals. Besides, it was demonstrated that antennae effect was facile in this systems, the porphyrin unit serves as acceptor whereas multiple donors are present in the dendrimer periphery.
DescripciónResumen del trabajo presentado al 6th EuCheMS Chemistry Congress, celebrado en Sevilla (España) del 11 al 15 de septiembre de 2016.
URIhttp://hdl.handle.net/10261/149053
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