首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Pnicogen Bonds between X=PH_3 (X = O, S, NH, CH_2) and Phosphorus and Nitrogen Bases
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Pnicogen Bonds between X=PH_3 (X = O, S, NH, CH_2) and Phosphorus and Nitrogen Bases

机译:X = PH_3(X = O,S,NH,CH_2)与磷和氮碱之间的电子键

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Ab initio MP2/aug′-cc-pVTZ calculations have been carried out to investigate the pnicogen bonded complexes formed between the acids O=PH_3, S= PH_3, HN=PH_3, and H_2C=PH_3 and the bases NH_3, NCH, N_2, PH_3, and PCH. All nitrogen and phosphorus bases form complexes in which the bases are lone pair electron donors. The binding energies of complexes involving the stronger bases NH_3, NCH, and PH_3 differentiate among the acids, but the binding energies of complexes with the weaker bases do not. These complexes are stabilized by charge transfer from the lone pair orbital of N or P to the σ*P=A orbital of X=PH_3, where A is the atom of X directly bonded to P. PCH also forms complexes with the X=PH_3 acids as a π electron donor to the σ*P=A orbital. The binding energies and the charge-transfer energies of the π complexes are greater than those of the complexes in which PCH is a lone pair donor. Whether the positive charge on P increases, decreases, or remains the same upon complex formation, the chemical shieldings of 31P decrease in the complexes relative to the corresponding monomers. ~(1p)J(P?N) and ~(1p)J(P?P) values correlate best with the corresponding P?N and P?P distances as a function of the nature of the base. ~1J(P? A) values do not correlate with P?A distances. Rather, the absolute values of ~1J(P?O), ~1J(P?S), and ~1J(P?N) decrease upon complexation. Decreasing ~1J(P?A) values correlate linearly with increasing complex binding energies. In contrast, ~1J(P?C) values increase upon complexation and correlate linearly with increasing binding energies.
机译:已经进行了从头算MP2 / aug'-cc-pVTZ的计算,以研究酸O = PH_3,S = PH_3,HN = PH_3和H_2C = PH_3与碱基NH_3,NCH,N_2, PH_3和PCH。所有氮和磷碱均形成络合物,其中该碱为孤对电子给体。涉及较强碱基NH_3,NCH和PH_3的复合物的结合能在酸中有所区别,但具有较弱碱基的复合物的结合能没有。通过从N或P的孤对轨道到X = PH_3的σ* P = A轨道的电荷转移来稳定这些络合物,其中A是X原子直接键合到P上的原子。PCH也与X = PH_3形成络合物酸作为σ* P = A轨道的π电子供体。 π络合物的结合能和电荷转移能大于其中PCH为孤对供体的络合物的结合能和电荷转移能。无论P上的正电荷在形成配合物时是增加,减少还是保持不变,相对于相应的单体,配合物中31P的化学屏蔽作用都会降低。 〜(1p)J(P?N)和〜(1p)J(P?P)值与相应的P?N和P?P距离之间的相关性最佳,这是基础性质的函数。 〜1J(P?A)值与P?A距离不相关。相反,〜1J(P?O),〜1J(P?S)和〜1J(P?N)的绝对值在络合时降低。减小〜1J(P?A)值与增加复杂的结合能成线性关系。相反,〜1J(P?C)值在络合时增加,并与增加的结合能线性相关。

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