A cobalt(II)-based spin triangle shows a significant spin-electric coupling. [Co (pytag)(py) Cl ]ClO ⋅3 py crystallizes in the acentric monoclinic space group P2 . The intra-triangle antiferromagnetic interaction, of the order of ca. -15 cm (H=-JS S ), leads to spin frustration. The two expected energy-degenerate ground doublets are, however, separated by a few wavenumbers, as a consequence of magnetic anisotropy and deviations from threefold symmetry. The Co planes of symmetry-related molecules are almost parallel, allowing for the determination of the spin-electric properties of single crystals by EFM-ESR spectroscopy. The spin-electric effect detected when the electric field is applied in the Co plane was revealed by a shift in the resonance field. It was quantified as Δg /E=0.11×10 m V , which in terms of frequency corresponds to approximately 0.3 Hz m V . This value is comparable to what was determined for a Cu triangle despite the antiferromagnetic interaction being 20 times larger for the latter.
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