Hydrothermal Synthesis and Crystal Structure of Bis(pyrazinium-2,3-dicarboxylato)manganate dihydrate

Abstract

 

The coordination compound Mn(C₆H₃N₂O₄)₂·2H₂O has been synthesized
and its crystal structure was determined by X-ray diffraction. Crystal
data: orthorhombic, space group C2/c, a = 14.4451(16) Å, b = 8.4711(11)
Å, c = 13.0204(14) Å, β =11.689(2)º, V = 1447.6(3) ų, M_r = 425.18,
F(000) = 860, Z = 4, D_c = 1.951 Mg/m³, μ = 0.986 mm^-1. The final R₁ =
0.0585 and wR₂ = 0.1449 for 1270 observed reflections (I > 2σ(I)). In the
title compound, bis(pyrazinium-2,3-dicarboxylato)-manganate dihydrate
[Mn(C₆H₃N₂O₄)₂·2H₂O], the Mn²⁺ ions are bridged by the pyrazine-
2,3-dicarboxylate (PZDA) ligands to build two-dimensional polymeric
layers. Each Mn²⁺ ion is six-coordinated by two N and two O atoms
with chelating mode, respectively from the two PZDA ligands and two
O atoms with mono-mode, respectively from other different PZDA
ligands. The lattice water molecules lie between the polymeric layers,
which form strong hydrogen bonds to form three-dimensional crystal
structure.