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(2) The defects as Brønsted acid sites were evaluated by potentiometric acid–base titration and then correlated with the Brønsted acid catalyzed epoxide ring-opening reaction with alcohol. (49,50) ...

Stark effect measurements have been performed on six Lewis acid−base complexes containing 32SO3 and 11BF3. The following dipole moments have been obtained: HC14N−SO3 (4.4172 ± 0.0031 D); CH3C14N−S ...

Raw images of Mars taken by the Perseverance rover and Ingenuity Mars helicopter in Jezero Crater.