Hydrothermal synthesis and structural characterization of organically templated zincophosphites: [C6H22N4]0.5⋠[Zn2(HPO3)3] and [C3N2H5]⋠[Zn1.5(HPO3)2]

Two novel organically templated zincophosphites, [C6H22N4]0.5⋅[Zn2(HPO3)3] and [C3N2H5]⋅[Zn1.5(HPO3)2] were synthesized using triethylenetetramine and imidazole as templates and characterized by single-crystal X-ray diffraction. [C6H22N4]0.5⋅[Zn2(HPO3)3] crystallizes in monoclinic P-1 with cell parameters a=7.6468(6)Å, b=8.4084(6)Å, c=12.3097(6)Å, and α=70.488(4)°, β=73.687(4)°, γ=64.772(4)°. [C3N2H5]⋅[Zn1.5(HPO3)2] crystallizes in monoclinic C2/c with cell parameters a=10.3397(6)Å, b=14.7632(6)Å, c=13.7726(7)Å, and β=100.734(5)°. Two zincophosphites consist of alternatively linked ZnO4 tetrahedra and [HPO32−] pseudo pyramidal units. [C6H22N4]0.5⋅[Zn2(HPO3)3] has two-dimensional structure and possesses a triple unit of 4-membered ring building-unit. [C3N2H5]⋅[Zn1.5(HPO3)2] has three-dimensional structure and imidazole cations are located in the 12-membered ring channel systems. Both of the compounds were also characterized by IR spectroscopy, thermogravimetric and differential thermal analyses.