2.2. Quantum chemistry computational methods
The X-ray structure of CB[6] was used as initial geometry for the
calculation [35]. The ONIOM optimization and SP (single-point)
Energy were all computed using the Gaussian 09 package [36]. The
ONIOM-type approach (oniom(b3lyp/6-31þg:uff)) was adopted
according to reference [37], in which the supramolecular complex was divided into two layers: (1) the host, being set as the lower
layer, described by a simple molecular mechanics field (UFF), and
(2) the guest (DSMI), treated with DFT methodology (B3LYP/6-
31Gþ) as the higher layer. The positions of the host and DSMI were
manually set to form at least five different conformations, typically
with DSMI partially or fully included by the host cavity. After the
host-guest system was optimized to achieve the local energy
minimum state, a single-point energy calculation for the inclusion
complex was carried out by B3LYP/6-31Gþ methods.
2.2. Quantum chemistry computational methodsThe X-ray structure of CB[6] was used as initial geometry for thecalculation [35]. The ONIOM optimization and SP (single-point)Energy were all computed using the Gaussian 09 package [36]. TheONIOM-type approach (oniom(b3lyp/6-31þg:uff)) was adoptedaccording to reference [37], in which the supramolecular complex was divided into two layers: (1) the host, being set as the lowerlayer, described by a simple molecular mechanics field (UFF), and(2) the guest (DSMI), treated with DFT methodology (B3LYP/6-31Gþ) as the higher layer. The positions of the host and DSMI weremanually set to form at least five different conformations, typicallywith DSMI partially or fully included by the host cavity. After thehost-guest system was optimized to achieve the local energyminimum state, a single-point energy calculation for the inclusioncomplex was carried out by B3LYP/6-31Gþ methods.
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