Magneto-structural correlation in Cu(II) complexes with iPr-bpa studied by ESR spectroscopy

Reaction of the bis(2-picolyl)amine (bpa) ligand with copper(II) results in formation of four complexes with a large structural variety: monomer, bromo-bridged dimer, a coordination polymer and a cyclic trimer that binds atmospheric CO2. Here we present an X-band electron spin resonance (ESR) study of the copper(II) complexes, from room down to liquid helium temperature. The spectral simulations were obtained using spin-Hamiltonian approach and EasySpin software [1]. The results obtained from the study will be discussed in terms of copper coordination geometries and magnetic interactions of copper spins S = 1/2 [2, 3].