Synthesis and gas occlusion of rhodium(II) benzoate bridged by pyrazine derivatives

Rhodium(II) benzoate bridged by pyrazine derivatives occlude a large amount of N-2 gas, reversibly. The maximum amounts of the occluded N-2 were 1.8, 1.7, 0.5, 0.1, 1.3, and 1.3 mol per one mole of rhodium(II) salt with 2-met hylpyrazine, 2,3-dimethylpyrazine, quinoxaline, 1,5-naphthyrizine, and trie thylenediamine, respectively, indicating the presence of a large number of micropores in these rhodium(II) carboxylates. The porous structure which is formed by the self-assembly of linear rhodium(II) benzoate-pyrazine deriva tives was deduced by analogy to the structure of rhodium(II) benzoate-pyrad ine reported previously.