Structure of 2-Aminopyridinium Dihydrogendiphosphate Monohydrate

Abstract  

Chemical preparation, X-ray single-crystal of the bis(2-aminopyridinium)-dihydrogendiphosphate monohydrate (C₅H₇N₂)₂H₂P₂O₇·H₂O are described. The title compound crystallizes in the triclinic system with P \mathop 1^- \mathop 1\limits^{-} space group. The unit cell dimensions are a = 8.4378(4) ?, b = 8.5567(4) ?, c = 12.3245(5) ?, α = 105.678(2)°, β = 94.503(3)°, γ = 104.885(3)° with V = 817.44(6) ?³ and Z = 2. The structure of this compound includes two types of hydrogen bonds: (i) O–H···O, links the H₂P₂O₇ groups to form infinite inorganic layers \textH ₂ \textP ₂ \textO ₇ ( \textH ₂ \textO)]_n ^{2n -} . {\text{H}}_{ 2} {\text{P}}_{ 2} {\text{O}}_{ 7} ( {\text{H}}_{ 2} {\text{O)}}]_{n}^{ 2n - } . in (101) plan, (ii) N–H···O assemble inorganic layers leading to a three-dimensional arrangement.