Structural study of a new 1-(2-thienyl)-3-(3-methyl-2-thienyl)-propenone, in situ radiation-induced dimerization products

• Y MORENO ^[1] ; D CONTRERAS ^[1] ; A BULJAN ^[1] ; F BROVELLI ^[1] ; R BAGGIO ^[2]
  1. [1] Universidad de Concepción

     Universidad de Concepción

     Comuna de Concepción, Chile

     
  2. [2] Comisión Nacional de Energía Atómica Departamento de Física
• Localización: Journal of the Chilean Chemical Society (Boletín de la Sociedad Chilena de Química), ISSN-e 0717-6309, ISSN 0366-1644, Vol. 55, Nº. 4, 2010, págs. 519-521
• Idioma: inglés
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• Resumen

  • The new conjugated system ("chalcone kind") reported herein, 1-(2-thienyl)-3-(3-methyl-2-thienyl)-propenone, C12H10OS2 presents a monomeric molecular structure, and it most interesting aspects are to be found in it intermolecular interactions, of varied type (C-H-O, C-H---7C, n-n) and strength. Some anomalies detected in the refinement process, however, provided evidence that an unexpected in-situ, radiation-induced dimerization reaction had taken place during data collection, with the starting and final products coexisting in a topotactic fashion. This effect is depended of structural packing; that is not all this kind of conjugated system presents this effect. The main factor is the distance between the double bonds of neighboring monomers (about 3 A).