CRYSTAL STRUCTURE OF NORFLOXACINIUM AND 2,2 '-BIPYRIDYL-1 '-IUM 2-THIOBARBITURATES

Organic salts with the composition NfH₂(Htba)·6H₂O (I) and BipyH(Htba)·2H₂O (II) (Н₂tba is 2-thiobarbituric acid, NfH is norfloxacin and Bipy is 2,2′-dipyridyl) are prepared. Their structures are determined by XRD (CCDC cif-file No. 1967494-1967495). Crystals I are triclinic: a = 11.8821(4) Å, b = 11.9959(5) Å, c = 12.0038(4) Å, α = 119.835(1)°, β = 107.691(1)°, γ = 95.237(1)°, V = 1351.80(9) Å³, space group P-1, Z = 2. Crystals II are monoclinic: a = 7.9587(2) Å, b = 19.6272(4) Å, c = 10.1118(2) Å, β = 98.118(1)°, V = 1563.71(6) Å³, space group P2₁/n, Z = 4. The structures are stabilized by numerous hydrogen bonds and π–π interactions involving Нtba⁻, NfH+2NfH2+, and BipyH⁺ ions. Thermal decomposition of these compounds in air includes dehydration and oxidative degradation stages.