Table 3. NCI interaction critical points ((+/–)ρICP) representing the intra-host and host–guest noncovalent interactions in complex PPi@OH-C3-NAR, PPi@Cy-NAR.
| Complex | Noncovalent interactions | (–)ρICP | Complex | Noncovalent interactions | (–)ρICP |
| Intra-host a | Intra-host a | ||||
| PPi@OH-C3-NAR | O–H···OH | –0.0343 | PPi@Cy-NAR | O–H···OH | –0.0341 |
| O–H···OH | –0.0153 | O–H···OH | –0.0151 | ||
| N+–H···OH | –0.0286 | N+–H···OH | –0.0170 | ||
| Total | –0.0782 | Total | –0.0662 |
| Complex | Noncovalent interactions | (–)ρICP | Complex | Noncovalent interactions | (–)ρICP |
| Host–guest a | Host–guest a | ||||
| PPi@OH-C3-NAR | O–H···–O–P (5) | –0.0454 | PPi@Cy-NAR | O–H···–O–P (2) | –0.0398 |
aThe high densities (i.e., 0.005 < ρ(r) < 0.05 au) associated with these NCI interactions are consistent with their strong noncovalent character and indicative of attractive bonding interactions.