Field-effect transistors using cyclo[6]pyrrole as active layers were prepared by Langmuir-Blodgett (LB) method. Cyclo[6]pyrrole is a porphyrin analogue with an extended pi-system(22-pi-electron). It could form a stable, reproducible monolayer at the air-water interface, which could be transferred onto a substrate with nearly unity transfer ratio and resulted in multilayer structure with the cyclo[6]pyrrole molecules stacking in a face-to-face configuration due to strong intermolecular pi-pi interactions. An un-optimized device based on this LB films displayed a mobility of 0.014 cm(2) V-1 s(-1), which is higher than the highest value of the devices based on typical porphyrins reported. (c) 2005 Elsevier B.V. All rights reserved.