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. 2019 Jan 25;9:767. doi: 10.1038/s41598-018-36987-9

Figure 1.

Figure 1

Theoretically optimized geometries and counterpoise-corrected interaction energies for N+-C-H··O hydrogen bond models. The geometry optimizations and energy calculations were carried out at the M06-2X/6-311++G** level of theory in the gas phase. (A) Trimethylammonium (6) complexed with N-methylacetamide (1). (B) 6 complexed with propanoate (2). (C) 6 complexed with ethanol (3). (D) N-methylpiperidium (7) complexed with phenol (4).