Issue 2, 2001


A series of bis[octakis(alkylthio)phthalocyaninato]rare-earth-metal(III) discotic compounds, [(CnS)8Pc]2M (M = Eu(III), Tb(III), Lu(III); n = 8, 10, 12, 14, 16, 18), has been synthesized. The mesomorphic and supramolecular structures have been investigated by using differential scanning calorimetry, polarization microscopy and temperature-dependent X-ray diffraction techniques. From the X-ray diffraction and spectroscopic results, it was revealed that in each of the rare-earth compound classes, [(CnS)8Pc]2Eu (n = 10, 12), [(CnS)8Pc]2Tb (n = 10, 12, 14) and [(CnS)8Pc]2Lu (n = 10, 12), derivatives were found which displayed a novel unique pseudo-hexagonal mesophase.

The temperature dependence of the one-dimensional intracolumnar charge carrier mobilities, Σμ1D, has been measured for [(C12S)8Pc]2Lu and [(C18S)8Pc]2Lu using the PR-TRMC (pulse-radiolysis time-resolved microwave conductivity) technique. The mobility values in both the K and D phases are more than an order of magnitude larger than found previously for [(C12O)8Pc]2Lu and are close to the maximum values ever found for discotic materials. The lack of a decrease in Σμ1D at the mesophase to isotropic liquid transition suggests that these compounds may represent the first liquid phase organic semiconducting materials.

Supplementary files

Article information

Article type
18 May 2000
11 Sep 2000
First published
15 Nov 2000

J. Mater. Chem., 2001,11, 321-331

Discotic liquid crystals of transition metal complexes 29: mesomorphism and charge transport properties of alkylthio-substituted phthalocyanine rare-earth metal sandwich complexes

K. Ban, K. Nishizawa, K. Ohta, A. M. van de Craats, J. M. Warman, I. Yamamoto and H. Shirai, J. Mater. Chem., 2001, 11, 321 DOI: 10.1039/B003984P

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