Synthesis and characterization of copper(I) coordination compounds with (1-(2-pyridylazo)-2-naphthol) and (4-(2-pyridylazo)resorcinol)

Two cuprous complexes with 1-(2-pyridylazo)-2-naphthol (PAN) or 4-(2-pyridylazo)resorcinol (PAR) and triphenylphosphines, [Cu(PAN)(PPh3)2]BF4 (1) and [Cu(PAR)(PPh3)2]BF4 (2), are described in this work. The structures of both compounds were characterized by NMR and UV–Vis spectroscopies, mass spectrometry, IR-ATR measurements and DFT calculations. The single crystal diffraction of both complexes confirmed that the coordination polyhedrons around the copper centres are distorted tetrahedrons. Interestingly, the PAR and the PAN ligands are not planar in the synthesized complexes. The ligands coordinate to the central copper(I) ions by only two nitrogen atoms: one from pyridine and one from an azo group. The oxygen atoms from the hydroxyl groups do not form bonds with copper, but take part in strong intramolecular hydrogen bonds, which stabilize the conformations of the ligands. It is noteworthy that these bonds have different characters. In complex 2 we observed a typical O–H⋯N hydrogen bond, whereas in complex 1 proton transfer takes place, resulting in O⋯H–N bond formation. DFT data confirm the different characters of the H-bonds observed in the X-ray structures.

Graphical abstractThe single crystal X-ray diffraction analysis of two cuprous complexes with 1-(2-pyridylazo)-2-naphthol (PAN) or 4-(2-pyridylazo)resorcinol (PAR) and triphenylphosphines, [Cu(PAN)(PPh3)2]BF4 and [Cu(PAR)(PPh3)2]BF4, showed that the coordination polyhedrons around the copper centers are distorted tetrahedrons, with non-planar PAR and PAN ligands. The oxygen atoms from the hydroxyl group of PAR and PAN do not form bonds with copper, but take part in strong intramolecular hydrogen bonds of different character, which stabilize the conformations of the ligands.Figure optionsDownload full-size imageDownload as PowerPoint slide