Four new copper(II) complexes with di-substituted s-triazine-based ligands

► Four new copper complexes with di-substituted triazine-based ligands have been prepared and characterized. ► Compound 2 displays strong nitrate-π interaction with the closest contact of O⋯centroid distance of 2.736 Å. ► Two thiophene rings in 3 appear in clockwise orientation, whereas those in 4 are in counterclockwise orientation.