Crystal Structure of Tetrakis Imidazole Copper(II) Diadipate Complex

Abstract

The title compound, [Cu(C₃H₄N₂)₄(COO–(CH₂)₄–COOH)₂] is a neutral complex and exist as a monomeric unit. The Cu atom occupies at the center of symmetry (0, 0.5, 0) with a distorted octahedral geometry. Imidazole nitrogens N1 and N6 (Cu1–N1 = 1.993(3) Å; Cu1–N6 = 2.008(3) Å) from two different imidazole group which are symmetrically disposed provides the square base and the long carboxylate oxygens (Cu1–O2 = 2.582(3) Å) from the protonated end of symmetrically oriented dibasic acid at the trans axial position. The adipate monoanion is in weak coordination with the metal center via monodentate fashion. The strong carboxylate-carboxylic acid intermolecular O–H…O interaction between the adjacent molecules is present in this structure as observed in the crystal structure of hexanedioic acid is noteworthy. In addition to the O–H…O H-bonding other molecular interactions such as N–H…O and C–H…O in packing generates a 3-D hydrogen bond network.

Graphical Abstract

The title compound tetrakis imidazole Cu(II) diadipate is a neutral complex and exist as a monomeric unit with the metal atom occupies at the center of symmetry. Strong inter and intramolecular H-bonding interactions such as O–H…O, N–H…O and C–H…O in packing generates a 3-D hydrogen bond network.