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Fundacao para a Ciencia e Tecnologia (Portugal) for financial support to the Portuguese NMR network (PTNMR, Bruker Avance III 400 - Univ. Minho), FCT and FEDER (European Fund for Regional Development) - COMPETEQREN - EU for financial support to project PTDC/CTM/105597/2008 and to the research centre CQ/UM [PEst-C/QUI/UI0686/2013 (FCOMP-01-0124-FEDER-037302)]

&lt;strong&gt;Synthesis and characterization of novel 4&lt;em&gt;H&lt;/em&gt;-pyran-4-ylidene indole-based heterocyclic systems for several optical applications&lt;/strong&gt;