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Complex formations of copper(II) with some analogous ligands of N,N¢-bis(pyrdin-2-ylmethyl)propane-1,3-diamine and their crystal structures have been reported.1–4 In a research of the complex formation of CuSO4·5H2O with N,N¢-bis(pyridin-2ylmethyl)propane-1,3-diamine, which was prepared, according to a published method,5 a green product was accidentally found. It is interesting to identify the unknown green product, because it sometimes leads to finding unexpected compounds.6,7 Since the green product gave single-crystals in a methanolic solution, the crystal structure was determined. The green product was a copper(II)-2-Py complex ([Cu2(2Py)2(H2O)(OH)2(SO4)]), where 2-Py is 2-pyrdinecarboxylic acid anhydride. When 0.08 mol of 2-pyridinecarbaldehyde (Wako, Osaka, Japan) mixed with 0.40 mol of 1,3-propanediamine (Wako) as the starting material of N,N¢-bis(pyrdin-2-ylmethyl) propane-1,3-diamine was heated in an absolute methanolic solution, the 2-Py might be prepared from the dehydration of 2-pyridinecarboxylic acid via the oxidation of 2-pyrdinecarbaldehyde. When CuSO4·5H2O (Wako) in an absolute methanolic solution was added to the resulting 2-Py in X-ray Structure Analysis Online

Crystal Structure of a Copper(II)-2-pyridinecarboxylic Acid Anhydride Complex