Supramolecular 2D structure of Co(2-Me-Pyz)2(H2O)42 (original) (raw)

The complex [ Co (2-Me -Pyz ) 2 ( H 2 O ) 4 ]( NO 3 ) 2 is synthesized and its structure is determined. The crystals are monoclinic: space group P 2 1 / n , a = 10.685(2) Å, b = 6.837(1), c = 12.515(3) Å , β = 91.84(3)°, V = 913.8(3) Å 3 , ρ calcd = 1.042 g/cm 3 , Z = 2. The Co 2+ ion (in the inversion center) is coordinated at the vertices of the distorted octahedron by two nitrogen atoms of methylpyrazine and four oxygen atoms of the water molecules (Co(1)-N(1) 2.180(3), average Co(1)-O( w ) 2.079(3) Å, angles at the Co atom 87.9(1)-92.1(1)° ). Supramolecular pseudometallocycles are formed in the structure through the O( w )-H ···N (1) hydrogen bonds between the coordinated H 2 O molecules and the terminal nitrogen atoms of the 2-methylpyrazine molecules. Their interaction results in the formation of supramolecular layers joined by the N O 3 groups into a three-dimensional framework.