cg400331h_si_002.cif (12.09 kB)

Molecular Salts of Anesthetic Lidocaine with Dicarboxylic Acids: Solid-State Properties and a Combined Structural and Spectroscopic Study

Download (12.09 kB)
posted on 19.02.2016, 07:14 by Dario Braga, Laura Chelazzi, Fabrizia Grepioni, Elena Dichiarante, Michele R. Chierotti, Roberto Gobetto
Four lidocaine molecular salts of dicarboxylic acids (oxalic, fumaric, malonic, and succinic) were synthesized and characterized by a combined use of X-ray powder and single-crystal diffraction, differential scanning calorimetry, Fourier transform infrared spectroscopy (FT-IR), and solid-state NMR (1H MAS and CRAMPS, and 13C and 15N CPMAS): all molecular salts show a dramatic increase in their melting point with respect to both lidocaine and lidocaine hydrochloride, and a higher dissolution rate and thermodynamic solubility in physiological solution with respect to the free base.