Synthesis and gas occlusion of new micropore substance rhodium(II) carboxylates bridged by pyrazine

Rhodium(II) carboxylates bridged by pyrazine occlude a large amount of N-2 gas, reversibly. The maximum amounts of the occluded N-2 gas were 1.8, 1.1, 0.8, 0.6, 0.2, 0.2, 0.5, and 0.6 mol per one mole of rhodium(II) salt with benzoate, o-hydroxybenzoate, m-hydroxybenzoate, p-hydroxybenzoate, o-tolua te, m-toluate and p-toluate, respectively indicating the presence of a larg e number of micropores in these rhodium(II) carboxylates. The porous structure which is formed by self-assembly of linear rhodium(II) carboxylates-pyrazine was deduced from the magnetic susceptibilities and b y analogy to the structure of copper(II) dicarboxylates which show similar gas-occlusion behavior.