Studies on Magnetic and Dielectric Properties of Antiferromagnetically Coupled Dinuclear Cu(II) in a One-Dimensional Cu(II) Coordination Polymer

A one-dimensional Cu­(II) coordination polymer with encapsulated
antiferromagnetically coupled binuclear Cu­(II) has been synthesized
by using 5-nitroisophthalic acid (5-N-IPA) and 4-aminopyridine (4-APY)
[Cu2(5-N-IPA)2(4-APY)4]n (1). Electrical properties are examined
by complex impedance (Z*), dielectric permittivity
(ε*), and ac conductivity studies at different frequencies (10
kHz–5 MHz) and temperatures (253–333 K). The contribution
of grain and grain boundary has been explained by a different theoretical
model. The variable temperature magnetic susceptibility data for compound 1 were recorded between 300 and 2 K. The shape of the curve
(χMT vs T) indicates
dominant antiferromagnetic coupling, which results from the interaction
between the copper­(II) atoms.