doi:10.1021/jo300373mengMartí­nez De Baroja, NataliaGarí­n, JavierOrduna, JesúsAndreu, Raquel.Blesa, María JesúsVillacampa, BelénAlicante, RaquelFranco,SantiagoSynthesis, characterization, and optical properties of 4 H-pyran-4-ylidene donor-based chromophores: The relevance of the location of a thiophene ring in the spacerART-2012-78342A series of new 4H-pyran-4-ylidene donor-based chromophores with a thiophene ring in the spacer has been synthesized. The linear and nonlinear optical (NLO) properties of these compounds have been determined and compared with the results of computational calculations. The position of the thiophene ring proved essential to optimize the figure of merit μβ, with the best results obtained when the heterocyclic system was closer to the donor moiety.2012http://zaguan.unizar.es/record/16533910.1021/jo300373mhttp://zaguan.unizar.es/record/165339oai:zaguan.unizar.es:165339Journal of Organic Chemistry 77, 10 (2012), 4634-4644All rights reservedhttp://www.europeana.eu/rights/rr-f/info:eu-repo/semantics/openAccess