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CCSDT and CCSD(T) Calculations on Model H-Bonded and Stacked Complexes

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    0101121 - UFCH-W 20040130 RIV NL eng J - Journal Article
    Pittner, Jiří - Hobza, Pavel
    CCSDT and CCSD(T) Calculations on Model H-Bonded and Stacked Complexes.
    [CCSDT a CCSD(T) výpočty modelových vodíkově vázaných a stacked komplexů.]
    Chemical Physics Letters. Roč. 390, 4/6 (2004), s. 496-499. ISSN 0009-2614. E-ISSN 1873-4448
    R&D Projects: GA MŠMT LN00A032
    Institutional research plan: CEZ:AV0Z4040901
    Keywords : basic-set calculations * energies * MP2
    Subject RIV: CF - Physical ; Theoretical Chemistry
    Impact factor: 2.438, year: 2004

    The CCSD(T) and CCSDT interaction energies were determined for model planar H-bonded complexes (formamide... form-formamide, formamidine... formamidine) and stacked complexes (ethylene... ethylene, formaldehyde... formaldehyde). Various basis sets from the 6-31G*(0.25) to aug-cc-pVDZ were used. Difference between CCSD(T) and CCSDT interaction energies were small and become negligible (bellow 0.1 kcal/mol) if the aug-cc-pVDZ (or aug-cc-pVDZ/cc-pVDZ) basis set was applied. This result strongly supports the use of the CCSD(T) method for determination of true stabilization energies of extended complexes.

    CCSDT a CCSD(T) interakční energie byly vypočteny pro modelové planární vodíkově vázané komplexy (formamide...formamide, formamidine...formamidine) a stackované komplexy (ethylene...ethylene, formaldehyde...formaldehyde). Byly použity různé báze 6-31G* až aug-cc-pVDZ. Rozdíly mezi interakčními energiemi CCSDT a CCSD(T) byly malé a staly se aznedbatelné při použití bází aug-cc-pVDZ (či aug-cc-pVDZ/c-pVDZ). Tento výsledek silně podporuje používání metody CCSD(T) pro výpočty stabilizačních energií rozsáhlejších komplexů.
    Permanent Link: http://hdl.handle.net/11104/0000033

     
     
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