Two zinc(II) coordination polymers of tetrazolate-5-carboxylate with self-penetrating three-dimensional nets: Synthesis, structure, and luminescence properties

Two coordination compounds of the ligand tetrazolate-5-carboxylate (tzc) with zinc(II), namely, [Zn₂(tzc)₂(bpp)] (1) and [Zn ₂(tzc)₂(bpea)] (2) [bpp = 1,3-bis(4-pyridyl)propane, bpea = 1,2-bis(4-pyridyl)ethane] were synthesized by hydrothermal methods involving the in situ generation of the ligand from sodium ethyl tetrazolate-5- carboxylate. Both compounds 1 and 2 exhibit a three-dimensional structure with 3,4-connected self-penetrating net topology in which two-dimensional Zn ^II-tzc layers are interlinked by the bpp or bpea spacers, with the tzc ligand being in the μ₃-N1,O1:N4,O2:N2 coordination mode. The luminescence properties of 1 and 2 were also investigated.