A compact planar low-energy-gap molecule with a donor-acceptor-donor nature based on a bimetal dithiolene complex

Abstract

We present the first report of a compact, planar and low-energy-gap molecule based on a π-conjugated bimetal system comprising a tetrathiooxalate (tto) skeleton. The observed low HOMO-LUMO energy gap (1.19 eV) is attributed to its donor-acceptor-donor (D-A-D) nature because the tto skeleton acts as an electron acceptor as well as a tiny and noninnocent bridging moiety.