首页> 美国卫生研究院文献>Molecules >Nucleophilicities of Lewis Bases B and Electrophilicities of Lewis Acids A Determined from the Dissociation Energies of Complexes B⋯A Involving Hydrogen Bonds Tetrel Bonds Pnictogen Bonds Chalcogen Bonds and Halogen Bonds
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Nucleophilicities of Lewis Bases B and Electrophilicities of Lewis Acids A Determined from the Dissociation Energies of Complexes B⋯A Involving Hydrogen Bonds Tetrel Bonds Pnictogen Bonds Chalcogen Bonds and Halogen Bonds

机译:Lewis碱B的亲核性和Lewis酸A的亲电性由涉及氢键Tetrel键Pnictogen键硫属元素键和卤素键的配合物B⋯A的解离能确定

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摘要

It is shown that the dissociation energy De for the process B⋯A = B + A for 250 complexes B⋯A composed of 11 Lewis bases B (N2, CO, HC≡CH, CH2=CH2, C3H6, PH3, H2S, HCN, H2O, H2CO and NH3) and 23 Lewis acids (HF, HCl, HBr, HC≡CH, HCN, H2O, F2, Cl2, Br2, ClF, BrCl, H3SiF, H3GeF, F2CO, CO2, N2O, NO2F, PH2F, AsH2F, SO2, SeO2, SF2, and SeF2) can be represented to good approximation by means of the equation De = cNBEA, in which NB is a numerical nucleophilicity assigned to B, EA is a numerical electrophilicity assigned to A, and c is a constant, conveniently chosen to have the value 1.00 kJ mol−1 here. The 250 complexes were chosen to cover a wide range of non-covalent interaction types, namely: (1) the hydrogen bond; (2) the halogen bond; (3) the tetrel bond; (4) the pnictogen bond; and (5) the chalcogen bond. Since there is no evidence that one group of non-covalent interaction was fitted any better than the others, it appears the equation is equally valid for all the interactions considered and that the values of NB and EA so determined define properties of the individual molecules. The values of NB and EA can be used to predict the dissociation energies of a wide range of binary complexes B⋯A with reasonable accuracy.
机译:结果表明,对于由11个路易斯碱B(N2,CO,HC≡CH,CH2 = CH2,C3H6,PH3,H2S,HCN组成的250个配合物B⋯A而言,过程B⋯A = B + A的离解能De ,H2O,H2CO和NH3)和23种路易斯酸(HF,HCl,HBr,HC≡CH,HCN,H2O,F2,Cl2,Br2,ClF,BrCl,H3SiF,H <3 GeF,F 2 CO,CO 2 ,N 2 O,NO 2 F,PH 2 F,AsH 2 F,SO 2 ,SeO 2 ,SF 2 和SeF 2 )可以通过等式D e = c ' N B E A < / sub>,其中N B 是分配给B的数字亲核性,E A 是分配给A的数字亲电性,c '是一个常数,可以方便地选择值为1.00 kJ mol -1 。选择了250种配合物以涵盖各种非共价相互作用类型,即:(1)氢键; (2)卤素键; (3)锡铁键; (4)光原键; (5)硫属元素键。由于没有证据表明一组非共价相互作用比其他一组拟合得更好,因此该方程对于所有考虑的相互作用都同样有效,并且N B 和E <这样确定的sub> A 定义了单个分子的特性。 N B 和E A 的值可用于以合理的精度预测各种二元配合物B⋯A的解离能。

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