Selective gas adsorption in a microporous metal-organic framework constructed of CoII4 clusters.

A porous metal-organic framework, [Co(II)(4)(micro-OH(2))(4)(MTB)(2) x (H(2)O)(4)](n) x 13nDMF x 11nH(2)O (SNU-15), has been prepared; the X-ray crystal structure reveals a CaF(2)-like structure that generates 3D channels and the desolvated solid [Co(II)(4) (micro-OH(2))(4)(MTB)(2)](n) (SNU-15') exhibits selective gas sorption properties for H(2) and O(2) gases over N(2) at 77 K, with exceptionally high O(2) density, as well as for CO(2) over CH(4) at 195 and 273 K, suggesting its potential application in gas separation processes.