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Charge mobility in discotic liquid crystalline porphyrins and phthalocyanines measured by PR-TRMC

John M. Warman

Radiation Chemistry Department, IRI, Delft University of Technology, Mekelweg 15, 2629 JB Delft, The Netherlands

Corresponding author, fax: +31 15-278-7421.

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Jessica E. Kroeze

Radiation Chemistry Department, IRI, Delft University of Technology, Mekelweg 15, 2629 JB Delft, The Netherlands

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Pieter G. Schouten

Radiation Chemistry Department, IRI, Delft University of Technology, Mekelweg 15, 2629 JB Delft, The Netherlands

Current address: Dr. P.G. Schouten, Philips Lighting Components, Building TY-p, P.O. Box 80020, 5600 JM Eindhoven, The Netherlands.

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, and

Anick M. van de Craats

Radiation Chemistry Department, IRI, Delft University of Technology, Mekelweg 15, 2629 JB Delft, The Netherlands

Current address: Dr. A.M. van de Craats, Netherlands Forensic Institute, Chemistry Department, PO Box 3110, 2280 GC Rijswijk, The Netherlands.

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https://doi.org/10.1142/S1088424603000446Cited by:15 (Source: Crossref)

Abstract

The pulse-radiolysis time-resolved microwave conductivity technique, “PR-TRMC”, has been used to determine the charge carrier mobility within columnar stacks of mesomorphic discotic porphyrins and phthalocyanines. The influences of temperature, morphology and variations in the primary molecular structure are demonstrated and discussed. Both the mesomorphic and conductive properties are shown to be dramatically influenced by subtle changes in the peripheral alkyl chain structure or the core-to-chain coupling element. Mobilities close to 1 cm².V⁻¹.s⁻¹ are found in crystalline solids, and well in excess of 0.1 cm².V⁻¹.s⁻¹ in columnar, liquid crystalline phases. These values which are even larger than those determined by PR-TRMC for conjugated polymers and similar to values found for electrons and holes in organic single crystals.

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