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Basis sets were obtained from the Extensible Computational Chemistry Environment Basis Set Database, Version 02/02/06, as developed and distributed by the Molecular Science Computing Facility, Environmental and Molecular Sciences Laboratory, which is part of the Pacific Northwest Laboratory, P.O. Box 999, Richland, Washington 99352, and funded by the U.S. Department of Energy. The Pacific Northwest Laboratory is a multiprogram laboratory operated by Battelle Memorial Institute for the U.S. Department of Energy under contract DE-AC06-76RLO 1830. See also https://bse.pnl.gov/bse/portal.
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Only in the case of PMCB(which has an intermediate number of atoms between HFCB and TDCB)was a full frequency analysis performed with the CRYSTAL06 program, as this version of the code allows the evaluation of the vibration modes in the condensed phase at the G point. The calculation took about 3 weeks on a very powerful computing platform with a 3056 MHz CPU. As expected, only the first three modes(i.e. those corresponding to the lowest frequencies)showed very small(̃10-9)and negative eigenvalues. Actually, the latter should be zero at the G point, as they correspond to the translational(acoustic) degrees of freedom of the molecule as a whole. No other negative eigenvalue has been found, confirming that the optimized solid-state geometry of PMCB corresponds to a true minimum on the PES
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-9)and negative eigenvalues. Actually, the latter should be zero at the G point, as they correspond to the translational(acoustic) degrees of freedom of the molecule as a whole. No other negative eigenvalue has been found, confirming that the optimized solid-state geometry of PMCB corresponds to a true minimum on the PES.
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For the gas-phase calculations, we also checked the 6-31G(d)basis set, which is the same used in the periodic optimizations, with the same DFT B3LYP Hamiltonian. Qualitatively, we obtained the same results as in the 6-311+G(d)calculations; anyhow, a larger basis set with diffuse functions on C and F atoms is essential to properly describe the electrostatic properties and the relaxation energies of the isolated molecules. The Mulliken dipole vector modulus, as an example, is equal to 1.289, 4.274, and 4.377 D in HFCB, PMCB, and TDCB optimized gas-phase geometries at the 6-31G(d)theory level, respectively. The introduction of the diffuse functions on the heavy atoms(6-31+G(d)basis set)increases the same quantities to 1.476, 4.600, and 5.210 D, respectively. When the larger 6-311 +G(d)basis set is used, a further(although much smaller)increment of the vector moduli takes place, their values becoming 1.556, 4.680, and 5.283 D, respectively. Additional introduction of diffuse functions6-31
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For the gas-phase calculations, we also checked the 6-31G(d)basis set, which is the same used in the periodic optimizations, with the same DFT B3LYP Hamiltonian. Qualitatively, we obtained the same results as in the 6-311+G(d)calculations; anyhow, a larger basis set with diffuse functions on C and F atoms is essential to properly describe the electrostatic properties and the relaxation energies of the isolated molecules. The Mulliken dipole vector modulus, as an example, is equal to 1.289, 4.274, and 4.377 D in HFCB, PMCB, and TDCB optimized gas-phase geometries at the 6-31G(d)theory level, respectively. The introduction of the diffuse functions on the heavy atoms(6-31+G(d)basis set)increases the same quantities to 1.476, 4.600, and 5.210 D, respectively. When the larger 6-311 +G(d)basis set is used, a further(although much smaller)increment of the vector moduli takes place, their values becoming 1.556, 4.680, and 5.283 D, respectively. Additional introduction of diffuse functions(6-311++G(d)basis set)or polarization functions(6-311+G(d,p)basis set)on the hydrogen atoms in the two methoxy derivatives has a negligible influence on both their dipole vectors and their relaxation energies. We therefore chose the 6-311 +G(d)basis set as our reference theory level for all the present gas-phase optimizations.
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