Cyclometallated Ni(II) and Pd(II) Complexes of the Azomethine Compounds: Synthesis and Structures

Abstract

New Ni(II) and Pd(II) complexes (Ia and Ib) are synthesized on the basis of the azomethine compound 2-[(E)-[4-methyl-2-[(Z)-p-tolylazo]phenyl]iminomethyl]phenol. The structures and properties of the complexes are characterized by IR spectroscopy, ¹Н NMR spectroscopy, and X-ray diffraction analysis (СIF files CCDC nos. 1899223 (Ia) and 1899224 (Ib)). The complex formation affords cyclometallated chelates. According to the X-ray diffraction data, the crystals of the Ni(II) and Pd(II) complexes are isostructural with the square geometry of the coordination mode (MCN₂O, M = Ni, Pd) and formation of two five-membered and one six-membered metallocycles.