Abstract
Mixed-metal complexes constructed from mixed-valent dinuclear ruthenium(II,III) carboxylate and dicyanidoargentate(I), K[Ru2(O2CCH3)4Ag(CN)2]⋅4H2O (1) and K2.5[Ru2{O2CC(CH3)3}4(Ag(CN)2)3.5]⋅3H2O (2), were synthesized and characterized by elemental analysis and IR and UV-visible-NIR spectroscopies. These data supported the formulation of mixed-metal adduct of Ru2(O2CCH3)4 + with two Ag(CN)2 − for 1 and mixed-metal dimer of Ru2{O2CC(CH3)3}4 + with aggregated {Ag(CN)2 −}2or3 through argentophilic Ag ⋅⋅⋅ Ag interaction for 2, respectively. A broadband (δ(Ru2) → δ ∗(Ru2)) at near-IR and two bands(δ ∗/π ∗ (Ru2) → σ ∗□u−O and π(Ru-O, Ru2) → π ∗(Ru2)) at visible region were observed in the diffused reflectance spectra (920sh, 634, and 444 nm for 1 and 930sh, 638, and 478 nm for 2, respectively). Temperature dependence of magnetic susceptibility measurement (4.5–300 K) showed that the former is paramagnetic (S = 3/2) with D (zero-field splitting parameter) = 78 cm−1 and the latter weakly antiferromagnetic with g = 2.07, zJ (the exchange integral multiplied by the number of interacting neighbors) =−0.5 cm−1, and D = 90 cm−1.
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The present work was partially supported by Grant-in-Aid for Scientific Research No. 26410080 from the Ministry of Education, Culture, Sports, Science and Technology (MEXT, Japan) and the MEXT-Supported Program for the Strategic Research Foundation at Private Universities, 2010–2014.
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Mikuriya, M., Tanaka, Y., Yoshioka, D. et al. Molecule-Based Magnetic Compounds Made Up from Dinuclear Ruthenium(II,III) Carboxylate and Dicyanidoargentate(I). J Supercond Nov Magn 28, 1013–1016 (2015). https://doi.org/10.1007/s10948-014-2646-5
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DOI: https://doi.org/10.1007/s10948-014-2646-5