3,3'-[Ethane-1,2-diylbis(aminomethylene)]bis(pentane-2,4-dione) and the Nickel(II) Complex of a Condensation Product

3,3′-[Ethane-1,2-diylbis(aminomethylene)]bis(pentane-2,4-dione) [C₁₄H₂₀N₂O₄, (1)] displays crystallographic twofold symmetry. The N—H function forms the donor part of a three-centre hydrogen bond, with two oxygen acceptors. [6,13-Diacetyl-5,12-dimethyl-1,4,8,11-tetraazacyclotetradeca- 4,6,11,13-tetraenato(2-)-κ⁴N]nickel(II) bis(deuterochloroform) solvate {[Ni(C₁₆H₂₂N₄O₂)].2CDCl₃, (2)} is a nickel complex of a condensation product of (1). It displays non-crystallographic inversion symmetry, with square-planar geometry at nickel and Ni—N bond lengths of 1.881 (3) and 1.882 (3) Å to N1 and N8 (with a neighbouring α-methyl group), respectively, and bond lengths of 1.835 (3) and 1.839 (3) Å to N4 and N11. Hydrogen bonds are formed from the carbonyl O atoms to the solvent D atoms.

-1