Crystal structure and solid state IR-LD analysis of a mononuclear Cu(II) complex of 4-aminopyridine

A new mononuclear Cu(II) complex of 4-aminopyridine (4AP), [Cu(4AP)₄]Cl₂·2CH₃OH (1), was obtained and structurally characterized by single-crystal X-ray diffraction methods. The complex is square-planar involving four monodentate 4AP molecules coordinated through the N_py atoms. A solid-state linear-dichroic spectroscopic analysis (IR-LD) as a suspension in a nematic liquid crystal was carried out over the 4000–400?cm^?1 range and determined stereochemical parameters compared crystallographic data. Detailed IR characteristics are reported.