The titled Schiff base derived from picolinaldehyde N-oxide with semicarbazone (PNOS) and it's copper(II) complex [Cu(PNOS)(NO_3)_2] have been synthesized. X-ray diffraction study shows that PNOS molecules form a bilayer 2D network via classical H-bonds, and further assemble to give a 3D infinite network through unclassical H-bonds. In the complex, PNOS is coordinated to copper(II) via the N-O oxygen, the C=N nitrogen and the C=O oxygen atoms, with one nitrate group serving as monodentate ligand, and the other as a bidentate ligand. The coordination geometry is a distorted octahedron. In the crystal, the complex molecules assemble to form a monolayer net via classical H- bonds and the monolayer net further forms a bilayer network through unclassical H-bonds.

Key words: COPPER COMPLEX, PYRIDINE P, FORMALDEHYDE P, SEMICARBAZIDE P, SCHIFF BASE, RETICULAR FORMATION, XRD