First Examples of Metal–Organic Frameworks with the Novel 3,3′-(1,2,4,5-Tetrazine-3,6-diyl)dibenzoic Spacer. Luminescence and Adsorption Properties

We report the synthesis of a novel ligand, 3,3′-(1,2,4,5-tetrazine-3,6-diyl)­dibenzoic
acid (1). In this fragment, we have introduced two carboxylate
groups with the aim of using this ligand as a linker to construct
three-dimensional metal–organic frameworks (MOFs). We have
been successful in the formation of zinc (2) and lanthanum
(3) MOFs. The zinc compound is a two-dimensional structure,
while the lanthanum material is a three-dimensional MOF with interesting
channels. We include the luminescence and adsorption studies of these
materials. Moreover, we have evaluated the in vitro toxicity of this
novel ligand, concluding that it can be considered negligible.