Synthesis and Crystal Structure of a Chain Complex of Rhodium(II) Benzoate and 1,4-Diazabicyclo[2.2.2]octane Having an N₂-Adsorption Property

抄録

The title compound, a chain adduct of rhodium(II) benzoate with 1,4-diazabicyclo[2.2.2]octane (dabco), catena(tetrakis(μ-benzoato-O,O′)(μ-1,4-diazabicyclo[2.2.2]octane-N,N′)dirhodium(II)-acetonitrile(1/4)), [Rh₂(C₆H₅CO₂)₄(dabco)]_n·4nCH₃CN, was isolated. The crystal structure was determined by the single-crystal X-ray diffraction method at 293 K. It crystallizes in the tetragonal space group P4/n with a = 21.3695(18)Å, c = 9.6278(12)Å, V = 4396.6(8)ų, D_x = 1.468 g/cm³, and Z = 4. The R1 [I > 2σ(I)] and wR2 (all data) values are 0.0417 and 0.0825, respectively, for all 5185 independent reflections. The molecule has a linear chain with an alternating arrangement of Rh₂(C₆H₅CO₂)₄ [Rh-Rh 2.4062(11)Å, 2.4110(11)Å] and dabco. The adsorption property was confirmed for N₂ gas with a specific surface area of 387.8 m² g^-1 estimated from an N₂ adsorption isotherm.