Abstract
New copper(II) pyridinecarboxylate compounds of the composition [CuX
2(Et
2nia)
2(H
2O)
2] (where X=2-methylthionicotinate (2-MeSnic), 2-chloronicotinate (2-Clnic), 2,6-dichloronicotinate (2,6-Cl
2nic), isonicotinate (isonic) and Et
2nia=
N,N-diethylnicotinamide) have been prepared. All the [CuX
2(Et
2nia)
2(H
2O)
2] compounds seem to possess octahedral copper(II) stereochemistry with differing tetragonal distortions. An X-ray analysis of [Cu(2-Clnic)
2(Et
2nia)
2(H
2O)
2] was carried out and it featured a tetragonal-bipyramidal geometry around the copper(II) atom. The tetragonal plane is created by 2-chloronicotinate anions bonded to the copper(II) atom via the unidentate carboxylate oxygen atoms [Cu–O1=1.965(2) Å] and the pyridine ring nitrogen atoms of the neutral ligand
N,N-diethylnicotinamide [Cu–N1=2.015(2) Å], whilst in axial positions are water molecules [Cu–O1w=2.503(2) Å].
New copper(II) pyridinecarboxylate compounds of the composition [CuX
2(Et
2nia)
2(H
2O)
2] (where X=2-methylthionicotinate (2-MeSnic), 2-chloro-nicotinate (2-Clnic), 2,6-dichloronicotinate (2,6-Cl
2nic), isonicotinate (isonic) and Et
2nia=
N,
N-diethylnicotinamide) have been prepared. All the [CuX
2(Et
2nia)
2(H
2O)
2] compounds seem to possess octahedral copper(II) stereochemistry with differing tetragonal distortions. An X-ray analysis of [Cu(2-Clnic)
2(Et
2nia)
2(H
2O)
2] was carried out and it featured a tetragonal-bipyramidal geometry around the copper(II) atom.