Two two-dimensional hydrogen-bonded coordination networks: bis(3-carboxybenzoato-κO)bis(4-methyl-1H-imidazole-κN3)copper(II) and bis(3-methylbenzoato-κN)bis(4-methyl-1H-imidazole-κN3)copper(II) monohydrate
Abstract
The title two-dimensional hydrogen-bonded coordination compounds, [Cu(C8H5O4)2(C4H6N2)2], (I), and [Cu(C8H7O2)2(C4H6N2)2]·H2O, (II), have been synthesized and structurally characterized. The molecule of complex (I) lies across an inversion centre, and the Cu2+ ion is coordinated by two N atoms from two 4-methyl-1H-imidazole (4-MeIM) molecules and two O atoms from two 3-carboxybenzoate (HBDC−) anions in a square-planar geometry. Adjacent molecules are linked through intermolecular N—H...O and O—H...O hydrogen bonds into a two-dimensional sheet with (4,4) topology. In the asymmetric part of the unit cell of (II) there are two symmetry-independent molecules, in which each Cu2+ ion is also coordinated by two N atoms from two 4-MeIM molecules and two O atoms from two 3-methylbenzoate (3-MeBC−) anions in a square-planar coordination. Two neutral complex molecules are held together via N—H...O(carboxylate) hydrogen bonds to generate a dimeric pair, which is further linked via discrete water molecules into a two-dimensional network with the Schläfli symbol (43)2(46,66,83). In both compounds, as well as the strong intermolecular hydrogen bonds, π–π interactions also stabilize the crystal stacking.
