Three types of alkyl-substituted vanadyl phthalocyanines (OVPcs) were synthesized and their organic thin film
transistors (OTFTs) were prepared by solution casting with a bottom gate and top contact device geometry. A peripheral
octaoctyl-substituted OVPc (OVPc-op-C8) showed the mobility in the order of 10-5 cm2/V•s. Both peripheral and nonperipheral
tetraalkyl-substituted OVPcs are a mixture of four isomers, and exhibited the mobility of 10-4-10-2 cm2/V•s,
depending on the length of the alkyl chains. Four isomers of non-peripheral tetraalkyl-substituted OVPcs can be
separated by common lab column chromatography. A mobility of 0.13 cm2/V•s has been demonstrated with a pure
isomer.
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