Synthesis, Spectroscopic and Magnetic Studies of Cobalt(II), Nickel(II) and Copper(II) Complexes with 3′- and 5′-Methoxysalicylaldimine-3-Ethylene-1H-Indole. X-Ray Structure of BIS(1H-Indole-3-Ethylene-5′-Methoxysalicylaldimine)Copper(II) | Publicación