Abstract
The absolute pK a values of the α-COOH, α-NH, and CH groups of the fullerene derivative l-Ala-C60H in water were calculated by quantum chemical methods. The gas phase basicities were calculated by the DFT method B3LYP/6-31G(d)//B3LYP/6-311++G(2d,p). The Gibbs free energies of solvation were calculated at the Hartree-Fock and B3LYP levels in combination with the polarizable continuum model. The stabilities of the l-Ala-C60H isomers and the lowest-energy conformers for neutral and anionic states were determined at the B3LYP/6-31G(d) level. The CH group at fullerene in l-Ala-C60H is less basic in the gas phase than the CH group in C60H2 and than the COOH group in l-Ala-C60H and AcOH. The calculated pK a values of the dissociating groups in water increase in the order: NH2 +(COOH-CH(Me)-NH 2 +-C60H) < COOH (COOH-CH(Me)-NH-C60H) < COOH (AcOH) < CH (COOH-CH(Me)-NH-C60 H) < CH (C60 H 2) < NH3 + (Me-NH 3 +). The amino group in l-Ala-C60H is electrically neutral, while the carboxy group is negatively charged at physiological pH values. The COOH group in l-Ala-C60H is more acidic (pK a = 4.2) than the CH group at fullerene (pK a = 5.8). The results of the calculations agree with the experimental data on the chemical reactivities of these compounds.
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Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 3, pp. 0567–0571, March, 2014.
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Luzhkov, V.B., Romanova, V.S. & Kotelnikov, A.I. Quantum chemical calculations of the dissociation constants pK a for l-Ala-C60H (an amino acid derivative of fullerene) in water. Russ Chem Bull 63, 567–571 (2014). https://doi.org/10.1007/s11172-014-0474-1
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DOI: https://doi.org/10.1007/s11172-014-0474-1