Dimetalated Crown Ether Schiff Base Palladacycles. Influence of the Carbon Chain Length on the Coordination Mode of Bidentate Phosphines. Crystal and Molecular Structure of the Novel Complex [Pd21,4-[C(H)═N9,10-(C8H16O5)C6H3]2C6H2-C2,C5(Cl)2μ-Ph2P(CH2)5PPh22] | Publicación