Synthesis and characterization of a new (2-NH2-6-CH3C5H4N)H2XO4 (X=P, As)

Crystals of 2-amino-6-methylpyridinium dihydrogenmonophosphate (denoted as 2A6MPP) and 2-amino-6-methylpyridinium dihydrogenmonoarsenate (denoted as 2A6MPAs), have been prepared and grown at room temperature. They crystallize with triclinic unit cells and are isotopic. The following unit cell parameters were found, (2-NH2-6-CH3C5H4N)H2PO4: a=7.5165(6), b=8.2640(5), c=8.5674(7)A, α=64.845(5), β=80.156(3), γ=85.783(5), Z=2, V=474.61(6)A3; (2-NH2-6-CH3C5H4N)H2AsO4: a=7.6011(4), b=8.4261(6), c=8.7074(6)A, α=64.228(3), β=81.047(4), γ=85.972(4), Z=2, V=496.09(6)A3. The common space group is P1-bar . We have determined the structure of the phosphate. It exhibits infinite (H2PO4)n-n chains. The organic groups (2-NH2-6-CH3C5H4N)+ are anchored between adjacent polyanions through multiple hydrogen bonds. The thermal property of the compound was investigated as well as was the IR property supported by group theoretical analyses