A reaction
between a ZrIV salt and a porphyrinic tetracarboxylic
acid leads to a metal–organic framework (MOF) with two types
of open channels, representing a MOF featuring a (4,8)-connected sqc net. The MOF remains intact in both boiling water and
aqueous solutions with pH ranging from 1 to 11, a remarkably extensive
pH range that a MOF can sustain. Given its exceptional stability and
pH-dependent fluorescent intensity, the MOF can potentially be applied
in fluorescent pH sensing.