Photochromic materials are molecules that undergo interconversion or isomerization between two stable and meta-stable states upon irradiation. This property allows potential applications in optical switches, and sensors due to their reversible changes in structure and photo-responsive electronic properties. An efficient photochromic class is bicyclic aziridines. This photochromic unit presents not only efficient behavior in liquid-state but also good behavior in solid-state. In this work, bicyclic aziridine contained thiophene monomers were synthesized. The structural characterization of these monomers was performed by using <sup>1</sup>H and <sup>13</sup>C NMR, Uv-Xis, and X-Ray techniques. Thus, the bicyclic aziridine will be incorporated in conjugated small molecules for switchable molecular electronic properties.

Incorporation of a photochromic bicyclic aziridine in thiophene based

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