期刊
JOURNAL OF PHYSICAL CHEMISTRY A
卷 116, 期 21, 页码 5199-5206出版社
AMER CHEMICAL SOC
DOI: 10.1021/jp300540z
关键词
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资金
- Ministerio de Ciencia e Innovacion of Spain [CTQ2009-13129-C02-02]
- Comunidad Autonoma de Madrid [S2009/PPQ-1533]
Quantum calculations at the MP2/cc-pVTZ, MP2/aug-cc-pVTZ, and CCSD(T)/c-cpVTZ levels have been used to examine 1:1 and 1:2 complexes between O2NX (X = Cl, Br, and I) with NH3. The interaction of the lone pair of the ammonia with the sigma-hole and pi-hole of O2NX molecules have been considered. The 1:1 complexes can easily be differentiated using the stretching frequency of the N-X bond. Thus, those complexes with sigma-hole interaction show a blue shift of the N-X bond stretching whereas a red shift is observed in the complexes along the pi-hole. The SAPT-DFT methodology has been used to gain insight on the source of the interaction energy. In the 1:2 complexes, the cooperative and diminutive energetic effects have been analyzed using the many-body interaction energies. The nature of the interactions has been characterized with the atoms in molecules (AIM) and natural bond orbital (NBO) methodologies. Stabilization energies of 1:1 and 1:2 complexes including the variation of the zero point vibrational energy (Delta ZPVE) are in the ranges 7-26 and 14-46 kJ mol(-1), respectively.
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