Three-dimensional iron-series coordination networks based on antiferromagnetic and ferromagnetic dinuclear motifs with mixed carboxylate and aqua bridges

Two new carboxylate–oxygen bridged trinuclear M(II) (MMn and Co) compounds with zwitterionic dicarboxylate ligands: crystal structures and magnetism

“…The leastsquares fit of the experimental data for the experimental χT/T plot in the whole temperature range was done and the best-fit parameter set is J = −2.21 cm −1 , λ = −172 cm −1 , α = 1.18 and Δ = −575 cm −1 . The values of the single-ion parameters λ, α and Δ fall within the most common ranges expected for six-coordinated Co(II) complexes [33,40]. The J value confirms an intramolecular AF interaction through the mixed (μ-COO) 2 (μ-H 2 O) triple bridges.…”

“…The χ −1 versus T plot above 14 K follows the Curie-Weiss law with C = 9.11 emu K mol −1 and θ = −21.8 (K). The negative Weiss constant also indicates an AF interaction between adjacent Co(II) ions, which is found in other Co(II) complexes with similar bridges [33,39].…”

“…S2) [34]. Polymeric coordination networks especially 3D networks containing mixed (μ-COO) 2 (μ-H 2 O) motifs as secondary building units are relatively rarely reported [30][31][32][33]. To our knowledge, coordination polymer with 3D networks which is based on linear trinuclear [Co 3 (μ-COO) 2 (μ-H 2 O)] units has not yet been reported.…”