ELENA BIANCA (GEORGESCU) STOICA, CATHERINE BRANGER, TANTA VERONA IORDACHE, ANDREI SARBU, HORIA IOVU, OLEG B. VITRIK, ANTON V. DYSHLYUK, HUGUES BRISSET CRYSTAL STRUCTURE OF TETRAKIS(2,2’-BITHIOPHENE-5-YL)SILANE The crystal structure of tetrakis(2,2’-bithiophene-5-yl)silane, C16H10S4Si0.5, has been determined at 293K in the Monoclinic (I2) symmetry. The Si atom has quasi-perfect tetrahedral geometry and bithiophene unit are quasi-planar. Comparison of Si-C bond lengths with literature data indicates an electron donating effect of the terminal thienyl ring on the first C linked to the Si central atom. The study of C-C bond lengths reveals a much more aromatic character for the four thienyl rings directly linked to the Si atom. The molecular packing arrangement shows that each molecule presents eight intermolecular contacts.