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This is a structure in a family concerning new polythiophene derivatives. This kind of compounds, a chalcones, has interesting aspects about its intermolecular interactions, of varied type (C-H···O, C-H···π, π···π) and strength. In the case of the title compound, C 15 H 14 OS 2 , interactions of all three types generate a rather compact, evenly connected 3D structure. e-mail: ymoreno@udec.cl INTRODUCTION The electronic and optoelectronic applications of conjugated polymers as organic wide-gap semi-conductors have attracted considerable interest in the last decade. In this field, polythiophenes derivatives are among the most studied because of their potential use in organic light-emitting diodes. 1-3 These polymers (used to prepare electroluminicent devices) are obtained through monomer polymerization via electrochemical deposition on indium tin oxide. 4,5 The polymeric films obtained show photoluminiscent emission between 660 and 720 nm and exhibit a turn-on voltage at about 2-4 V. The I-V curves of device have been interpreted by mean tunneling process described by the Fowler—Nordheim theory.

SYNTHESIS AND STRUCTURAL DETERMINATION OF A NEW CHALCONE 1,5-BIS(3-METHYL-2-THIENYL)PENTA-1,4-DIEN-3-ONE, C15H14OS2