Poly[[bis{μ2- N2, N6-bis[(pyridin-3-yl)methyl]pyridine-2,6-dicarboxamide}dichloridonickel(II)] N, N-dimethylformamide tetrasolvate].

In the title compound, {[NiCl2(C19H17N5O2)2]·4C3H7NO} n, the NiII atom is located on an inversion centre and is in a six-coordinated octahedral geometry, formed by four pyridine N atoms from four N2, N6-bis[(pyridin-3-yl)methyl]pyridine-2,6-dicarboxamide (BPDA) ligands occupying the equatorial plane and two chloride anions at the axial sites. The bidentate bridging BPDA ligands link the NiII atoms into a two-dimensional corrugated grid-like flexible layer with a (4,4)-connected topology, which consists of left- and right-handed helical chains sharing the common NiII atoms. Investigation of the thermal stability shows that the network is stable up to 573 K. [ABSTRACT FROM AUTHOR]