Characterization of ofloxacin-oxalic acid complex by PXRD, NMR, and THz spectroscopy.
A novel ofloxacin-oxalic acid complex was prepared by the cogrinding method. The obtained complex was characterized by powder X-ray diffraction (PXRD), infrared (IR), solid-state nuclear magnetic resonance (NMR), and terahertz (THz) spectroscopy. The PXRD measurement revealed that the ofloxacin-oxalic acid complex induced by cogrinding was formed at a molar ratio of 1:2. Weak interaction between two components, not a hydrogen bonding, was found by IR and solid-state NMR spectroscopy. The distinctive THz spectrum showed that the vibrational modes of the complex were different from those of the starting materials, suggesting that THz spectroscopy is an alternative tool to evaluate complex formation through weak interactions.
Limwikrant
Waree
W
Graduate School of Pharmaceutical Sciences, Chiba University, 1-33 Yayoi-cho, Inage-ku, Chiba 263-8522, Japan.
Higashi
Kenjirou
K
Yamamoto
Keiji
K
Moribe
Kunikazu
K
D000900:Anti-Bacterial Agents / Q000737:chemistry*; D018360:Crystallography, X-Ray; D005240:Feasibility Studies; D009682:Magnetic Resonance Spectroscopy; D015242:Ofloxacin / Q000737:chemistry*; D019815:Oxalic Acid / Q000737:chemistry*; D033362:Powder Diffraction; D017550:Spectroscopy, Fourier Transform Infrared; D013678:Technology, Pharmaceutical / Q000379:methods*; D055069:Terahertz Imaging
D000900:Anti-Bacterial Agents; D019815:Oxalic Acid; D015242:Ofloxacin