Abstract
The rational selection of ligands is vitally important in the construction of new organic-inorganic hybrid three-dimensional perovskite complexes. As part of an exploration of perovskite-type materials, two new Na-I compounds based on the piperazine ligand, namely poly[piperazinediium [tri-μ-iodido-sodium]], {(C4H12N2)[NaI3]}n, 1, and catena-poly[tris(piperazinediium) [[triiodidosodium]-μ-iodido] triiodide monohydrate], {(C4H12N2)3[NaI4]I3·H2O}n, 2, have been synthesized by adjusting the stoichiometric ratio of sodium iodide and piperazine, and were characterized by single-crystal X-ray diffraction. In the crystal structures of 1 and 2, each NaI cation is linked to six I atoms, but the compounds show completely different configurations. In 1, the structure includes a perovskite-like array of vertex-sharing NaI6 octahedra stretching along the direction of the three axes, and each piperazinediium dication is enclosed in the NaI3 perovskite cage. However, in 2, each NaI atom bridges a single I atom to form a one-dimensional linear chain, and complex intermolecular hydrogen bonds connect these one-dimensional chains into a three-dimensional supramolecular network.
Highlights
In recent decades, three-dimensional organic–inorganic hybrid perovskites have been of interest to researchers, for their remarkable structural variability and highly tunable properties, and for their rich physical properties, such as superconductivity, ionic conductivity and ferroelectric related properties (Jin et al, 2009; Saparov & Mitzi, 2016; Veldhuis et al, 2016)
Following on from this work, we report the new threedimensional organic–inorganic hybrid perovskite C4H12N2ÁNaI3 (1)
Compound 1 crystallizes in the monoclinic system and exhibits the three-dimensional perovskite framework
Summary
Three-dimensional organic–inorganic hybrid perovskites have been of interest to researchers, for their remarkable structural variability and highly tunable properties, and for their rich physical properties, such as superconductivity, ionic conductivity and ferroelectric related properties (Jin et al, 2009; Saparov & Mitzi, 2016; Veldhuis et al, 2016). Such hybrid perovskites have a simple generic formula of AMX3 (A = organic cation, M = metal cation and X = halogen anion) and the structural characteristic of corner-sharing MX6 octahedra. Yellow needle-shaped crystals of 2 were obtained by slow volatilization of the aqueous solution at 330 K after 2 d
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