Magnetization studies of hexakis(pyridine N-oxide)nickel(II) tetrafluoroborate and perchlorate down to 2 K

Abstract

The principal magnetizations of [Ni(pyo)₆][BF₄]₂ and average magnetization of [Ni(pyo)₆][ClO₄]₂ have been measured from 2 to 20 K at magnetic-field strengths up to 50 kG (pyo = pyridine N-oxide). The magnetization of [Ni(pyo)₆][BF₄]₂ parallel to the c axis can be reproduced by the spin-Hamiltonian parameters g_∥= 2.28 and D= 5 cm^–1. The perpendicular magnetization is reduced by antiferromagnetic exchange interactions with T_N < 2 K. The average magnetization of [Ni(pyo)₆][ClO₄]₂ is similar to that of the tetrafluoroborate salt indicating that the exchange interactions in the two compounds are also similar.