Abstract
We present a continuous-wave electron paramagnetic resonance (EPR) study of Cu(ipa)(H2O) (ipa stands for isophthalate ligand) metal–organic framework (MOF) that is based on the kagome topology. The main structural unit of this compound is a copper paddle-wheel (PW) consisting of two Cu2+ ions interconnected via four carboxylate groups in the syn–syn fashion. X- and Q-band EPR measurements of this MOF allow us to probe distinct magnetic interactions of different magnitudes that originate from these dinuclear units. EPR experiments performed at different temperatures reveal that two Cu2+ ions in a single PW are antiferromagnetically coupled to the total spin S = 0 state with the exchange coupling constant J = −285 cm–1. The fine structure pattern observed in the spectra indicates the thermal population of the excited triplet S = 1 spin states of the Cu2+ pairs. Spectral simulations are used to determine the fine and hyperfine structure tensors of the PW units. At higher temperatures a collapse of the fine s...
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