Research on the Structure of the Tetrahydrofuran Complex of 2,4,6-Trinitro-3-Hydroxypyridine Silver.

Silver salts and their complexes play crucial roles as catalysts in organic chemistry. In this study, pyridine-3-ol was employed as the raw material to synthesize the tetrahydrofuran complex of 2,4,6-trinitro-3-hydroxypyridine silver (4) through nitration, salt formation, and other reactions. The structure was characterized using nuclear magnetic resonance spectroscopy (NMR), Fourier transform infrared spectroscopy (FT-IR), elemental analysis (EA), and single-crystal X-ray diffraction (SC-XRD). Its thermal properties were investigated by differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). The results show that the crystal of compound 4 belongs to the orthorhombic system, with the space group Pna21. The unit cell parameters are as follows: a = 11.263(4) Å, b = 12.405(5) Å, c = 19.598(7) Å, α = 90°, β = 90°, γ = 90°, V = 2738.2(17) Å3, and Z = 4. The crystal density is 1.985 g·cm-3 (300 K). Compound 4 undergoes thermal decomposition at 226.4 °C.