The silicon analogues of the oligo (p-phenylenevinylene) s (Si-OPVs) with highly planar structures have been synthesized using a newly developed ligand, the 1, 1, 3, 3, 5, 5, 7, 7- octaethyl-s-hydrindacen-4-yl (Eind) group. Their X-ray crystal structures and spectroscopic data demonstrate that the π-conjugation effectively extends over the Si-OPV framework. Notably, tetrasiladistyrylbenzene exhibits an orange fluorescence even at room ...