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Mixed-metal chain complexes constructed from lantern-type dinuclear ruthenium(II,III) carboxylate unit and tetracyanidonickelate(II), (PPh 4 ) n (Ru 2 (O 2 CCH 3 ) 4 Ni(CN) 4 ) n ·nH 2 O (1) and (PPh 4 ) n (Ru 2 {O 2 CC(CH 3 ) 3 } 4 ) 3n (Ni(CN) 4 ) 2n ·2nH 2 O (2), were synthesized and characterized by elemental analysis, IR, and UV-vis spectroscopies. These data are in accordance with the formation of the chain complex with an alternative arrangement of the dinuclear Ru 2 unit and tetracyanidonickelate(II). A broad band at near-IR and a band at visible region (1058 and 452 nm for 1 and 1082 and 454 nm for 2) were observed in the diffused refl ectance spectra and ascribed to a δ(Ru 2 )→δ*(Ru 2 ) and a π(RuO, Ru 2 )→π*(Ru 2 ) transitions, respectively. Temperature-dependence of magnetic susceptibility (4.5—300 K) showed that the antiferromagnetic interaction between the dinuclear units is weak (zJ = −0.2 cm −1 ) with D value of 75 cm −1 for both complexes.

Mixed-Metal Complexes of Mixed-Valent Dinuclear Ruthenium(II,III) Carboxylate and Tetracyanidonickelate(II)