Metal-carboxylate clusters are ideally suited as secondary building units (
SBU) for the assembly of extended open frameworks. Examples extracted from
the chemistry of the multidentate building block 1,4-benzenedicarboxylate (
BDC) show that Zn(BDC) clusters lead to the formation of rigid, stable and
truly microporous metal-carboxylate networks. Gas sorption isotherms measur
ed for this class of materials show type (I) gas uptake that is analogous t
o those observed for zeolites and molecular sieves.