4,4’-dipyridylcopper(II) nitrate as a 2D organometallic framework

The crystal structure of the organometallic framework, namely, 4,4’-dipyridylcopper(II) nitrate with the DMSO molecule in the copper coordination sphere, has been described, the structural features have been established by the X-ray method. Crystallographic data: C55H93Cu2N12O23S7, M 1641.91; monoclinic syngony, space group P 1 21/n 1; cell parameters: a = 15.490(3), b = 14.760(3), c = 15.980(3); a = 90, β = 90.10(3), g = 90 deg.; V = 3653.5(13) Å3, Z = 2, ρcalc = 1.493 g/cm3. The bidental ligand in the organometallic framework is 4,4’-bipyridyl; copper, being a complexing ion, forms a coordination octahedron, the nitrogen atoms of bipyridine fragments are in four equatorial positions, the oxygen atoms of nitrate ion and dimethyl sulfoxide are in two axial positions. The Cu-N bond lengths in the equatorial position are in the range of 2.014-2.031 Å, and the Cu-O bond lengths are 2.297 Å and 2.515 Å. The occupation of the equatorial positions by 4,4’-dipyridyl leads to formation of a layered structure, which distinguishes the resulting compound from another MOF based on copper(II), nitrate ions and 4,4’-dipyridyl, in which all the equatorial positions are occupied by NO3-groups. The individual layers in the obtained 4,4’-dipyridylcopper(II) nitrate are not crosslinked; they are shifted relative to neighboring layers. The pyridyl rings of 4,4’-dipyridyl are rotated at an angle of 5.77(2) degrees. relative to each other.