Synthesis of new heteroaromatic nitrogen ligands: Pyrimido-[4″, 5″:4′,5′]-thieno[3′,2′:4,5]thieno[3,2-d] pyrimidines and 1,2,3-triazine[4″,5″:4′,5′] thieno[3′,2′:4,5]thieno[3,2-d]-1,2,3-triazines

1. Blanco, G.
2. Quintela, J.M.
3. Peinador, C.