Syntheses, structures, and host-guest interactions of 2-D grid-type cyanide-bridged compounds [Zn(L)(H₂O)₂][M(CN)₄]·3H₂O (L = N,N′-bis(4-pyridylformamide)-1,4-benzene; M = Ni, Pd or Pt)

Abstract

Self-assembly of Zn²⁺, the pillar ligand N,N′-bis(4-pyridylformamide)-1,4-benzene, and [M(CN)₄]²⁻ (M = Ni, Pd, or Pt) formed three compounds [Zn(L)(H₂O)₂][M(CN)₄]·3H₂O (1–3). Single-crystal X-ray diffraction (XRD) analysis reveals that 1–3 are isostructural and consist of cyanide-bridged 2-D grid-type layers built of [Zn(L)(H₂O)₂]²⁺ chains cross-linked by [M(CN)₄]²⁻ units. Thermogravimetric and powder XRD analyses indicate that 1 has a high thermal stability and exhibits reversibility for desorption/resorption of water guest molecules.

Keywords:

• Tetracyanometalates
• Structures
• Grid
• Host-guest

Acknowledgments

This research was supported by the projects of National Natural Science Foundation (51072072, 51102119, 51272095), Natural Science Foundation of Jiangsu Province (BK2011518).