Deprotonated and non-deprotonated cobalt(II) complexes of the bis-amide tetradentate ligand N,N′-(dipicolyl)-1,8-naphthylene diamine. Three different modes of coordination by the ligand. - Galinos, Andreas; Perlepes, Spyros; Zafiropoulos, Theodore; Ioannou, Panayiotis; Kouinis, John (Chemical Monthly / Monatshefte für Chemie, 1981)