Binuclear Metal Complexes. XV. Copper(II) and Nickel(II) Complexes of Binucleating Ligands Derived From 3-Formyl-salicylic Acid and Diamines

Abstract

Copper(II) and nickel(II) complexes of the 3-formylsalicylic acid-diamine Schiff bases, H4fsaen, H4fsapn, H4fsatn, H4fsaph, and H4fsach, where en, pn, tn, ph, and ch denote ethylenediamine, propylenediamine, trimethylenediamine, o-phenylenediamine, and 1,2-cyclohexanediamine respectively, have been obtained and characterized. Binuclear copper(II) complexes, Cu2(fsaen)·2H2O, Cu2(fsapn)·2H2O, Cu2(fsatn)·2H2O, Cu2(fsaph)·H2O, and Cu2(fsach)·2H2O, show a strong antiferromagnetic spin-exchange interaction between metal ions, −2J values being more than 555 cm−1. It was revealed that Ni2(fsaen)·3H2O, Ni2(fsapn)·3H2O, Ni2(fsaph)·5H2O, and Ni2(fsach)·3H2O are novel binuclear complexes composed of one paramagnetic and one diamagnetic nickel(II) ions. On the other hand, Ni2(fsatn)·5H2O is a binuclear complex of paramagnetic nickel(II) ions. Its magnetism obeys the Curie-Weiss law in the range from liquid nitrogen temperature to room temperature with the Weiss constant of −40 K.