氢键相互作用等体系的结构,相互作用及其性质的理论研究
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  • 英文题名:Theoretical Studies of Structures, Interactions and Properties in Some Hydrogen Bonds and Other Interaction Systems
  • 作者:李茹姣
  • 论文级别:博士
  • 学科专业名称:物理化学
  • 学位年度:2005
  • 导师:李志儒
  • 学科代码:070304
  • 学位授予单位:吉林大学
  • 论文提交日期:2005-04-01
  • 答辩委员会主席:付宏刚
摘要
本文对氢键相互作用等体系的结构,相互作用和性质进行了理论研究,主要包括以下几个体系:
    (1)使用基函数x-aug-cc-pVXZ (x = s, d, t; X = D, T, Q)研究了基组效应。在CCSD(T)/ d-aug-cc-pVTZ 水平上计算了HCN-HF 和HNC-HF的电学性质(偶极矩μ,平均极化率α,各向异性极化率?α,第一超极化率β以及第二超极化率γ)。讨论了电学性质的电子相关效应。HCN-HF 的每一个电学性质的值都小于HNC-HF 的相应的电学性质值。
    (2)在B3LYP/ d-aug-cc-pVDZ 水平上计算得到了NH3-HCl-(H2O) n (n = 0 ~ 4)的几何结构。其中,n = 1 的结构发生质子转移,这与文献上报道的使用小基函数的计算结果不同。计算了静态偶极矩μ,极化率α,第一超极化率β,并且研究了基函数效应对物理性质(μ, α和β)的影响。随着水分子数的增加,体系的μ和β减小,α值增加。子体系NH3-HCl 的性质(μ, α和β)随着质子转移程度的增加而增大。
    (3)仅在单分子催化下的NH3-HCl 的质子转移研究使用MP2 方法和较大基函数6-311++G(2d,2p)。优化得到15 个发生从HCl 到NH3的质子转移的最小单元(NH3-HCl-A,A = H2SO4, H2SO3, HCOOH (a), HF, H2O2, HNO3, HNO2 (a), CH3OH, HCl, HNC, H2O, HNO2 (b), NH3, HCOOH (b) 和HCHO,三聚体环形结构)。提议用质子环流模型解释质子转移的机理。发现当两个氢键长的和(R = R1 + R2)小于5.0 ?时,分子A 具有催化质子转移的能力。
    (4)在MP2/aug-cc-pVTZ 水平上优化得到含有分子间三氢原子相互作用的5 个二聚体结构BH3-HY (HY = HCCH, HCCF, HCN, HCl 和HNC)。除BH3-HCl 外,其余4 个复合物都是C2v 对称结构。使用基
Hydrogen bond is one of the most important interactions encountered in gas, liquid, and solid phases. It plays a crucial role in chemistry, physics and biology. The theoretical studies were performed on the structures, interactions and properties of some representative systems containing hydrogen bond and other interactions in this thesis. The results obtained on new structures and intermolecular interactions may be valuable for improving our understanding of the nature of intermolecular interaction, and enriching our knowledge of hydrogen bonds and other weak intermolecular interactions. There are five main aspects included in this thesis:
    (1) Ab initio study of the interaction hyperpolarizabilities of HCN-HF and HNC-HF complexes: The effects of the intermolecular interaction on dipole moment (μ), the mean (α) and anisotropy (?α) of the polarizability, the first and second hyperpolarizabilities (βand γrespectively) of HCN-HF and HNC-HF complexes have been calculated using finite-field approximate approach. The augmented correlation consistent basis sets x-aug-cc-pVXZ (x = s, d, t; X = D, T, Q) are employed to study the effects of the basis sets. With
    the d-aug-cc-pVTZ basis set, the electric properties are obtained at the coupled-cluster theory with single, double substitutions and perturbatively linked triple excitations CCSD(T) level. For the saturated molecules HF dimer, the βvalue is about 1/4 of the sum of two monomers. For the dimer HCN-HF containing π-bond, the βvalue is about 3/5 of the sum of two monomers. Similar to the organic systems, the existence of π-bond obviously enhances the first hyperpolarizability of the hydrogen-bonded dimer. The electron correlation effects for those electric properties are discussed. The value of each electric property calculated for HCN-HF is less than that for HNC-HF. The μ= 2.2918 a.u., α= 23.186 a.u., ?α=14.393 a.u., β= -6.03 a.u. and γ= 2553.4 a.u. for HCN-HF; μ= 2.3338 a.u., α= 24.383 a.u., ?α= 14.875 a.u., β= 7.60 a.u. and γ= 3049.3 a.u. for HNC-HF. The electric properties comes from the interaction parts are: μint = 0.3908 a.u.(17.1 %), αint = 0.181 a.u.(0.8 %), ?αint = 4.300 a.u.(29.9 %), βint = 6.02.(-99.8 % ) a.u. and γint = -492.0 a.u.(-19.3 %) for HCN-HF; μint = 0.4080 a.u.(17.5 %), αint = -0.084 a.u.(0.3 %), ?αint = 5.041 a.u.(33.9 %), βint = -7.20 a.u. (-94.7 % ) and γint = -931.7 a.u.(-30.6 %) for HNC-HF. The data above indicate significant effect of intermolecular interaction on the electric properties. The estimated electron correlation corrections are βcorr = 6.59 a.u., γcorr = 549.2 a.u. for HCN-HF and βcorr = -9.49 a.u., γcorr = 1056.5 a.u. for HNC-HF, which show large electron correlation effects in the electric properties of intermolecular interaction systems.
    (2) DFT (Density functional theory) study on structures and interaction hyperpolaribilities of NH3-HCl-(H2O) n (n = 0 ~ 4) clusters: The optimized structures of NH3-HCl-(H2O)n (n = 0 ~ 4) clusters have been obtained by B3LYP/d-aug-cc-PVDZ method. It is found that, in the structure for n = 1 proton transfer occurs. It is different from the results by smaller basis sets from the references [Chem. Phys. Lett. 1998, 287, 549, J. Phys. Chem. A 1998, 102, 5117, Chem. Phys. Lett. 1999, 313, 366], in which it is concluded that the
    proton transfer occurs in the NH3-HCl-(H2O)n (n = 0 ~ 4) clusters only for n=2. Using the optimized structures, the static dipole moments (μ), polarizabilities (α) and the first hyperpolarizabilities (β) of the clusters were calculated and the basis set effects on the physical properties (μ, αand β) were also studied with aug-cc-pVDZ, aug-cc-pVDZ+BF, aug-cc-pVTZ, d-aug-cc-pVDZ, t-aug-cc-pVDZ basis sets. The solvent effects on the electric properties of the NH3–HCl cluster are as follows: the μand βvalue reduce, and the αvalue increases with the number of water molecules. For the NH3-HCl, the properties (μ, αand β) all increase with the strength of proton transfer, which is related to the solvent effects of water molecules. Consequently, the proton transfer is brought forward as a new factor in influencing electric properties.
    (3) Proton transfer of the NH3-HCl by only one molecule catalyze: The smallest units with proton transfer occurring were studied. The proton transfer in NH3-HCl by only one molecule catalyze was studied using MP2 method with the large 6-311++G(2d,2p) basis set. The 18 structures are obtained for the smallest units, NH3-HCl-A trimers, for which the proton transfer maybe occurred. The final results show that the proton transfers have occurred in the 15 cyclic shape structures for A = H2SO4, H2SO3, HCOOH (a), HF, H2O2, HNO3, HNO2 (a), CH3OH, HCl, HNC, H2O, HNO2 (b), NH3, HCOOH (b) and HCHO, and not occurred in another 3 trimer structures for A = HCN, H2S and PH3. These results show that the proton transfer occurs from HCl to NH3 when catalyst molecule A (acidic, neutral or basic) not only as a proton donor strongly donates the proton to the Cl atom but as an acceptor strongly accepts the proton from the NH3 molecule in the cyclic H-bond structure. In this work, a proton circumfluence model is proposed to explain the mechanism of the proton transfer. We find that, for the trimer, when the sum of two hydrogen bond lengths (R = R1 + R2) is shorter than 5.0 ?, the molecule A has the ability of catalyzing the proton transfer. In addition, we also find that the interaction
    energy Eint between NH3-HCl and A is nearly related to the extent (RH1-Cl) of proton transfer, that is, the interaction energy Eint increases with the proton transfer.
    (4) Ab Initio study on three hydrogen atoms interaction in the dimers BH3-HY (HY = HCCH, HCCF, HCN, HCl and HNC): The new geometrical structures of BH3-HCCH, BH3-FCCH BH3-HCN, BH3-HCl and BH3-HNC dimers were optimized at the MP2/aug-cc-pVTZ level, and the five dimers are the smallest structures including three hydrogen atoms interaction. Each structure of these dimers has C2v symmetry, except BH3-HCl. With aug-cc-pVTZ basis set the interaction energies Eint between three hydrogen atoms were calculated at seven levels of theory [HF, MP2, MP3, MP4(SDQ), MP4(SDTQ), CCSD and CCSD(T) ]. In the BH3-HY (HY = HCCH, HCCF, HCN, HCl and HNC) the largest interaction energy Eint is -1.73 kcal/mol (BH3-HNC, the corresponding RH1···H2 is the shortest, 2.207?), the smallest interaction energy Eint is -0.72 kcal/mol (BH3-HCCH, the corresponding RH1···H2 is the longest, 2.523?). The interaction between three hydrogen atoms is rather weak; it is a very weak intermolecular hydrogen-bonded interaction.
    (5) Single electron donor-acceptor bonds in the methyl radical complexes H3C-BH3, H3C-AlH3 and H3C-BF3: an ab initio study: A new kind of donor-acceptor complexes between methyl radical H3C and YZ3 (YZ3 = borane BH3, alane AlH3 and boron trifluoride BF3) molecules is predicted and intermolecular single electron donor-acceptor bonds in these methyl radical complexes are found. The optimized structures and harmonic vibrational frequencies (all real) of those methyl radical complexes are obtained by MP2/aug-cc-pVDZ approach. The single electron bond lengths of H3C-BH3, H3C-AlH3 and H3C-BF3 complexes are 2.181 ?, 2.594 ? and 2.823 ?, respectively. The intermolecular single electron donor-acceptor bond energies are calculated by the CCSD(T)/aug-cc-pVDZ method with Counterpoise
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