(C6H16N2)Zn3(HPO3)4H2O: a new layered zinc phosphite templated by diprotonated trans-1,4-diaminocyclohexane

Employing trans-1,4-diaminocyclohexane (trans-1,4-DACH) as a template, a new two-dimensional layered zinc phosphite (C6H16N2)Zn3(HPO3)4H2O (1) has been prepared hydrothermally. Single-crystal X-ray diffraction analysis shows that it crystallizes in the monoclinic space group P21/n with a=10.458(2)Å, b=14.720(3)Å, c=13.079(3)Å, β=97.93(3)°, V=1994.1(7)Å3, Z=4, R1=0.0349 (I>2σ(I)) and wR2=0.0605 (all data). The inorganic layer is built up by alternation of ZnO4 tetrahedra and HPO3 pseudo pyramids forming a 4.6.8-net. The sheet is featured by a series of capped six-membered rings. The diprotonated trans-1,4-DACH molecules reside in the interlayer region and interact with the inorganic network through H-bonds.