Hydrothermal syntheses and structures of a novel zincophosphite, [C6N2H18] · [Zn3(HPO3)4]

A novel three-dimensional organically templated zincophosphite, [C6N2H18] · [Zn3(HPO3)4], was synthesized under milder hydrothermal conditions and structurally characterized by single-crystal X-ray diffraction, differential thermal-thermogravimetric analysis, powder X-ray diffraction, 31P MAS NMR spectrum, and IR spectroscopy. It crystallizes in the monoclinic system, space group C2/c with cell parameters: a = 8.7820(4) Å, b = 14.9417(7) Å, c = 15.4943(5) Å, β = 92.940(2)°, and Z = 4. The structure consists of a network of strictly alternating ZnO4 tetrahedra and [HPO32-] pseudo-pyramid, forming 4-membered ring chains. The structure has a 4.8.16-net and 8- and 16-membered ring channels where completely protonated N,N,N′,N′-tetramethylenediamine cations are encapsulated. The structure is stabilized by template-to-framework hydrogen bonding. In phosphites system, this compound possesses extra-large-pores.

Graphical abstract[C6N2H18] · [Zn3(HPO3)4], zinc phosphite templated by N,N,N′,N′-tetramethylenediamine, has been synthesized under milder hydrothermal conditions. Here, we describe the characterization and crystal structure of the compound with an open framework of 16-membered ring channels. The 16-membered ring channels are built up by linking adjacent chains via Zn–O–P. They are extra-large-pores in phosphites system.Figure optionsDownload full-size imageDownload as PowerPoint slide