One more year we celebrate this congress that brings together chemistry professionals from both sides of the Miño. With the same enthusiasm as the first time, that November 14, 1985, when we met in Santiago de Compostela somewhat nervous but with the conviction that it was necessary to establish an exchange of knowledge that would favor "getting to know each other better," and allow enhance the interpersonal relationships of Chemistry professionals. It will be 40 years sharing research and experiences.