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Table 4 The electron density (ρBCP) and the associated value of Laplacian (▽2ρBCP), as well as the potential energy density (HBCP) at the bond critical point in ILs-Tyr complexes.

ILs-Tyr H-bond ρBCP/(a.u.) ▽2ρBCP/ (a.u.) HBCP/(10-3 a.u.) [C4-3mim][BF4]-Ty C2-H…OCOO 0.011 0.035 1.300 NTyr-H…F1 0.011 0.045 1.462 NTyr-H…F1 N/A N/A N/A NTyr-H…F2 0.022 0.093 2.007 [C4-2mim][BF4]-Tyr N3-H…OCOO 0.050 0.141 -7.241 NTyr-H…F1 0.027 0.115 1.922 CBen-H…F2 0.006 0.022 0.867 CBen-H…F3 0.008 0.030 0.995 [C12-3mim][BF4]-Tyr C2-H…Ocoo 0.007 0.023 0.556 CAlkyl-H…OOH 0.013 0.043 1.455 NTyr-H…F2 0.022 0.091 2.022 NTyr-H…F1 N/A N/A N/A NTyr-H…F1 N/A N/A N/A CBen-H…F1 0.007 0.028 1.015 [C12-2mim][BF4]-Tyr N3-H…OCOO 0.047 0.137 -5.678 NTyr-H…F1 0.024 0.100 1.959 NTyr-H…F2 N/A N/A N/A