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A possibility of a metal-insulator transition in molecular conductors hasbeen studied for systems composed of donor molecules and fully ionized anionswith an incommensurate ratio close to 2:1 based on a one-dimensional extendedHubbard model, where the donor carriers are slightly deviated from quarterfilling and under an incommensurate periodic potential from the anions. By useof the renormalization group method, interplay between commensurability energyon the donor lattice and that from the anion potential has been studied and ithas been found that an "incommensurate Mott insulator" can be generated. Thistheoretical finding will explain the metal-insulator transition observed in(MDT-TS)(AuI$_2$)$_{0.441}$.Comment: 4 pages, 4 figures, submitted to J. Phys. Soc. Jpn. at December 24  200

Incommensurate Mott Insulator in One-Dimensional Electron Systems Close to Quarter Filling