Solvent-Induced Topological Diversity of Two Zn(II) Metal–Organic Frameworks and High Sensitivity in Recyclable Detection of Nitrobenzene

The solvent-induced
topological diversity and different framework
stabilities were studied in two Zn­(II) metal–organic frameworks
(MOFs), {[Zn­(L)]·DMA}n (1) and {[Zn­(L)]·MeOH·0.5NMP}n (2) (H2L = 5-(4H-1,2,4-triazol-4-yl)­isophthalic
acid). Despite the fact that both of these MOFs are (3,6)-connected
networks based on the same coordination environment of Zn­(II) ions
and the same coordination mode of the ligands, they adopt distinct
nets with apo and rtl topologies, respectively,
which originate from the template effects of the solvents and the
conformational flexibility of the ligand. The two Zn­(II) MOFs show
remarkably different framework stability upon guest exchange due to
their different topological structures. The luminescent properties
of MOF 1 with different solvents have been studied in
detail, which shows high sensitivity in the detection of nitrobenzene
(NB). In addition, MOF 1 can be reused by simply washing
with fresh solvent.