Structural, magnetic, and ~1H NMR spectral study on lantern-type cis- and rrans-diruthenium(II,III) complexes with two formamidinato and two acetato bridges

摘要

Lantern-type dinuciear complexes, ris-[Ru2(4-Me-pf)2(O2CMe)2Cl] and trans-[Ru2(2,6-Et2-pf)2(O2CMe)2Cl] (4-Me-pf~ = N,N'-bis(4-methylphenyl)formamidinate ion and 2,6-Et2-pf~- = N,N'-bis(2,6-diethylphenyl) formamidinate ion), were prepared and characterized. The dinuciear structures with cis- and trans-arrangements of the bridging ligands were confirmed by the X-ray crystal structures as well as ~1H NMR spectra (298 K) in CD2Cl2, where the proton signals were observed at widely spread positions 8 = —80 to 25 ppm. Variable-temperature magnetic moments (2-300 K) showed the existence of three unpaired electrons in dinuciear units with large D values (65 cm~(-1) for cis-Ru2~(II,III) and 90 cm~(-1) for trans-Ru2(II,III)).