Synthesis and characterization of a new organic dihydrogen phosphate–arsenate: [H 2(C 4H 10N 2)][H 2(As, P)O 4] 2

Abstract

Chemical preparation, crystal structure, calorimetric and spectroscopic investigations (IR and RMN) are given for a new non-centrosymmetric organic-cation dihydrogen phosphate–arsenate [H 2(C 4H 10N 2)][H 2(As, P)O 4] 2. This compound is triclinic P1 with the following unit-cell parameters: a = 7.082(2) Å, b = 7.796(1) Å, c = 12.05(3) Å, α = 95.37(2)°, β = 98.38(3)°, γ = 62.98(1)°, Z = 2, V = 586.2(1) Å 3 and D x = 1.836 g cm −3. The crystal structure has been solved and refined to R = 0.03 using 2328 independent reflections. The structure can be described as infinite (H 2XO) n chains spreading parallel to the b direction. These chains are themselves interconnected by a set of N H⋯O hydrogen bonds generated by the organic entities, alternating with the chains. Solid-state 13C, 15N and 31P MAS NMR spectroscopies are in agreement with the X-ray structure.