高等学校化学学报 ›› 2019, Vol. 40 ›› Issue (7): 1439.doi: 10.7503/cjcu20190101
收稿日期:
2019-02-16
出版日期:
2019-07-10
发布日期:
2019-07-12
作者简介:
陈飞武, 男, 博士, 教授, 博士生导师, 主要从事量子化学研究. E-mail: 基金资助:
YI Jiang, QIN Xingmei, CHEN Feiwu*()
Received:
2019-02-16
Online:
2019-07-10
Published:
2019-07-12
Contact:
CHEN Feiwu
E-mail:chenfeiwu@ustb.edu.cn
Supported by:
摘要:
采用MP2/cc-pVDZ和cc-pVTZ基组分别对复合物XH2S+…NCH2P和NCH2P…PyX(X=NH2, CH3, H, CN, F, Cl, Br)中的硫键和磷键进行了研究, 讨论了键长、 键临界点的电荷密度(ρ)、 拉普拉斯密度(▽2ρ)、 范德华表面穿透距离、 二阶稳定化能和电荷转移量对硫键和磷键相互作用能的影响. 结果表明, 当取代基X为吸电子基团时, 形成的硫键较强. 当X为给电子基团时, 形成的磷键较强. 利用能量分解方法分析了取代基—CN导致硫键稳定性反常的可能原因. 还进一步讨论了三元复合物H3S+…NCH2P…PyX(X=NH2, CH3, H, CN, F, Cl, Br)中硫键和磷键的协同相互作用以及取代基对复合物稳定性的影响. 并通过对比相同的2种单体在三元复合物和二元复合物中的二阶稳定化能和相互作用能的差值, 说明了硫键与磷键起到相互促进的正协同作用, 增强了三元复合物的稳定性.
中图分类号:
TrendMD:
易江, 秦兴美, 陈飞武. 二元和三元复合物中阳离子硫键与磷键的理论研究. 高等学校化学学报, 2019, 40(7): 1439.
YI Jiang, QIN Xingmei, CHEN Feiwu. Theoretical Studies on Cationic Chalcogen and Pnicogen Bonds in Binary and Ternary Complexes†. Chem. J. Chinese Universities, 2019, 40(7): 1439.
X | ΔEAB/(kJ·mol-1) | RAB/nm | ρ/a.u. | ▽2ρ/a.u. |
---|---|---|---|---|
F | -161.70 | 0.22306 | 0.0586 | 0.1210 |
Cl | -116.45 | 0.24421 | 0.0378 | 0.1077 |
C≡N | -113.77 | 0.25719 | 0.0286 | 0.0917 |
Br | -104.56 | 0.25104 | 0.0331 | 0.0998 |
H | -94.27 | 0.26535 | 0.0235 | 0.0836 |
NH2 | -91.42 | 0.27472 | 0.0202 | 0.0717 |
CH3 | -79.49 | 0.28409 | 0.0171 | 0.0652 |
Table 1 Distance(RAB) between monomers in complexes, interaction energy(ΔE), the electron density(ρ) and Laplace density(▽2ρ) at the bond critical point of the binary complexes XH2S+…NCH2P*
X | ΔEAB/(kJ·mol-1) | RAB/nm | ρ/a.u. | ▽2ρ/a.u. |
---|---|---|---|---|
F | -161.70 | 0.22306 | 0.0586 | 0.1210 |
Cl | -116.45 | 0.24421 | 0.0378 | 0.1077 |
C≡N | -113.77 | 0.25719 | 0.0286 | 0.0917 |
Br | -104.56 | 0.25104 | 0.0331 | 0.0998 |
H | -94.27 | 0.26535 | 0.0235 | 0.0836 |
NH2 | -91.42 | 0.27472 | 0.0202 | 0.0717 |
CH3 | -79.49 | 0.28409 | 0.0171 | 0.0652 |
X | ΔEAB/(kJ·mol-1) | Δd/nm | WBI | X | ΔEAB/(kJ·mol-1) | Δd/nm | WBI |
---|---|---|---|---|---|---|---|
F | -161.70 | 0.16040 | 0.6684 | H | -94.27 | 0.12358 | 0.2985 |
Cl | -116.45 | 0.14429 | 0.4685 | NH2 | -91.42 | 0.11362 | 0.2565 |
C≡N | -113.77 | 0.13125 | 0.3564 | CH3 | -79.49 | 0.10668 | 0.2024 |
Br | -104.56 | 0.13842 | 0.4163 |
Table 2 van der Waals surface penetration distance(Δd) and Wiberg bond index(WBI) of binary complexes XH2S+…NCH2P
X | ΔEAB/(kJ·mol-1) | Δd/nm | WBI | X | ΔEAB/(kJ·mol-1) | Δd/nm | WBI |
---|---|---|---|---|---|---|---|
F | -161.70 | 0.16040 | 0.6684 | H | -94.27 | 0.12358 | 0.2985 |
Cl | -116.45 | 0.14429 | 0.4685 | NH2 | -91.42 | 0.11362 | 0.2565 |
C≡N | -113.77 | 0.13125 | 0.3564 | CH3 | -79.49 | 0.10668 | 0.2024 |
Br | -104.56 | 0.13842 | 0.4163 |
X | ΔEAB/(kJ·mol-1) | |||
---|---|---|---|---|
F | -161.70 | 176.60 | 11.80 | 0.2977 |
Cl | -116.45 | 78.23 | 5.94 | 0.2148 |
C≡N | -113.77 | 45.75 | 3.22 | 0.1749 |
Br | -104.56 | 58.48 | 4.60 | 0.1915 |
H | -94.27 | 16.95 | 2.51 | 0.1496 |
NH2 | -91.42 | 13.60 | 1.63 | 0.1308 |
CH3 | -79.49 | 12.31 | 1.38 | 0.1170 |
Table 3 ADCH charge(QNCH2P) and stabilization energy(E(2)) for binary complexes XH2S+…NCH2P
X | ΔEAB/(kJ·mol-1) | |||
---|---|---|---|---|
F | -161.70 | 176.60 | 11.80 | 0.2977 |
Cl | -116.45 | 78.23 | 5.94 | 0.2148 |
C≡N | -113.77 | 45.75 | 3.22 | 0.1749 |
Br | -104.56 | 58.48 | 4.60 | 0.1915 |
H | -94.27 | 16.95 | 2.51 | 0.1496 |
NH2 | -91.42 | 13.60 | 1.63 | 0.1308 |
CH3 | -79.49 | 12.31 | 1.38 | 0.1170 |
X | ΔEBC(1)/(kJ·mol-1) | ΔEBC(2)/(kJ·mol-1) | ΔEBC(3)/(kJ·mol-1) | ΔEBC(4)/(kJ·mol-1) | ΔEBC(5)/(kJ·mol-1) |
---|---|---|---|---|---|
NH2 | -29.76 | -31.02 | -31.48 | -29.80 | -27.38 |
CH3 | -28.34 | -29.59 | -29.38 | -29.47 | -29.01 |
H | -28.13 | -28.13 | -28.13 | -28.13 | -28.13 |
F | — | -25.32 | -25.83 | -25.24 | -24.86 |
Br | — | -25.12 | -25.66 | -25.24 | -27.63 |
Cl | — | -25.12 | -25.62 | -25.28 | -28.25 |
CN | — | -21.68 | -22.56 | -22.02 | -24.74 |
Table 4 Interaction energy(ΔE) of the binary complex NCH2P…PyX*
X | ΔEBC(1)/(kJ·mol-1) | ΔEBC(2)/(kJ·mol-1) | ΔEBC(3)/(kJ·mol-1) | ΔEBC(4)/(kJ·mol-1) | ΔEBC(5)/(kJ·mol-1) |
---|---|---|---|---|---|
NH2 | -29.76 | -31.02 | -31.48 | -29.80 | -27.38 |
CH3 | -28.34 | -29.59 | -29.38 | -29.47 | -29.01 |
H | -28.13 | -28.13 | -28.13 | -28.13 | -28.13 |
F | — | -25.32 | -25.83 | -25.24 | -24.86 |
Br | — | -25.12 | -25.66 | -25.24 | -27.63 |
Cl | — | -25.12 | -25.62 | -25.28 | -28.25 |
CN | — | -21.68 | -22.56 | -22.02 | -24.74 |
X | ΔEBC/(kJ·mol-1) | RBC/nm | ρ/a.u. | ▽2ρ/a.u. |
---|---|---|---|---|
NH2 | -31.48 | 0.27610 | 0.0218 | 0.0520 |
CH3 | -29.38 | 0.27849 | 0.0209 | 0.0504 |
H | -28.13 | 0.27993 | 0.0203 | 0.0494 |
F | -25.83 | 0.28251 | 0.0193 | 0.0478 |
Br | -25.62 | 0.28257 | 0.0192 | 0.0477 |
Cl | -25.66 | 0.28267 | 0.0192 | 0.0476 |
C≡N | -22.56 | 0.28603 | 0.0180 | 0.0453 |
Table 5 Interaction energy(ΔEBC), distance(RBC), electron density(ρ) at the critical point of the bond, Laplace density(▽2ρ) of the complex
X | ΔEBC/(kJ·mol-1) | RBC/nm | ρ/a.u. | ▽2ρ/a.u. |
---|---|---|---|---|
NH2 | -31.48 | 0.27610 | 0.0218 | 0.0520 |
CH3 | -29.38 | 0.27849 | 0.0209 | 0.0504 |
H | -28.13 | 0.27993 | 0.0203 | 0.0494 |
F | -25.83 | 0.28251 | 0.0193 | 0.0478 |
Br | -25.62 | 0.28257 | 0.0192 | 0.0477 |
Cl | -25.66 | 0.28267 | 0.0192 | 0.0476 |
C≡N | -22.56 | 0.28603 | 0.0180 | 0.0453 |
X | RAB/nm | RAB(T)/nm | ΔRAB/nm | RBC/nm | RBC(T)/nm | ΔRBC/nm | ΔρAB/a.u. | ΔρBC/a.u. |
---|---|---|---|---|---|---|---|---|
NH2 | 0.26535 | 0.25528 | -0.01007 | 0.27610 | 0.23557 | -0.04052 | 0.0049 | 0.0267 |
CH3 | 0.26535 | 0.25659 | -0.00876 | 0.27849 | 0.24076 | -0.03772 | 0.0042 | 0.0231 |
H | 0.26535 | 0.25729 | -0.00806 | 0.27993 | 0.24354 | -0.03639 | 0.0038 | 0.0214 |
Br | 0.26535 | 0.25807 | -0.00728 | 0.28257 | 0.24697 | -0.03560 | 0.0034 | 0.0196 |
Cl | 0.26535 | 0.25818 | -0.00717 | 0.28267 | 0.24729 | -0.03538 | 0.0034 | 0.0194 |
F | 0.26535 | 0.25825 | -0.00710 | 0.28251 | 0.24755 | -0.03496 | 0.0033 | 0.0192 |
CN | 0.26535 | 0.25955 | -0.00580 | 0.28603 | 0.25311 | -0.03292 | 0.0027 | 0.0165 |
Table 6 Distances(RAB) between monomers in complexes H3S+…NCH2P, distances(RBC) between monomers in binary complexes NCH2P…PyX, RAB(T)and RBC(T) in ternary complexes H3S+…NCH2P…PyX, their difference ΔRAB and ΔRBC, and density difference ΔρAB and ΔρBC at the bond critical points in the binary and ternary complexes*
X | RAB/nm | RAB(T)/nm | ΔRAB/nm | RBC/nm | RBC(T)/nm | ΔRBC/nm | ΔρAB/a.u. | ΔρBC/a.u. |
---|---|---|---|---|---|---|---|---|
NH2 | 0.26535 | 0.25528 | -0.01007 | 0.27610 | 0.23557 | -0.04052 | 0.0049 | 0.0267 |
CH3 | 0.26535 | 0.25659 | -0.00876 | 0.27849 | 0.24076 | -0.03772 | 0.0042 | 0.0231 |
H | 0.26535 | 0.25729 | -0.00806 | 0.27993 | 0.24354 | -0.03639 | 0.0038 | 0.0214 |
Br | 0.26535 | 0.25807 | -0.00728 | 0.28257 | 0.24697 | -0.03560 | 0.0034 | 0.0196 |
Cl | 0.26535 | 0.25818 | -0.00717 | 0.28267 | 0.24729 | -0.03538 | 0.0034 | 0.0194 |
F | 0.26535 | 0.25825 | -0.00710 | 0.28251 | 0.24755 | -0.03496 | 0.0033 | 0.0192 |
CN | 0.26535 | 0.25955 | -0.00580 | 0.28603 | 0.25311 | -0.03292 | 0.0027 | 0.0165 |
X | Δ | E(2) BC/(kJ·mol-1) | Δ | |||
---|---|---|---|---|---|---|
NH2 | 16.95 | 25.87 | 8.92 | 39.97 | 147.51 | 107.53 |
CH3 | 16.95 | 24.49 | 7.53 | 36.75 | 124.86 | 88.11 |
H | 16.95 | 23.78 | 6.82 | 34.87 | 113.98 | 79.11 |
Br | 16.95 | 22.98 | 6.03 | 31.60 | 102.09 | 70.49 |
Cl | 16.95 | 22.85 | 5.90 | 31.56 | 101.26 | 69.69 |
F | 16.95 | 22.81 | 5.86 | 31.98 | 100.71 | 68.73 |
CN | 16.95 | 21.60 | 4.65 | 27.88 | 83.93 | 56.05 |
Table 7 Comparison of second-order stabilization energies(ΔE(2)) of binary complexes XH2S+…NCH2P, NCH2P…PyX and ternary complexes H3S+…NCH2P…PyX
X | Δ | E(2) BC/(kJ·mol-1) | Δ | |||
---|---|---|---|---|---|---|
NH2 | 16.95 | 25.87 | 8.92 | 39.97 | 147.51 | 107.53 |
CH3 | 16.95 | 24.49 | 7.53 | 36.75 | 124.86 | 88.11 |
H | 16.95 | 23.78 | 6.82 | 34.87 | 113.98 | 79.11 |
Br | 16.95 | 22.98 | 6.03 | 31.60 | 102.09 | 70.49 |
Cl | 16.95 | 22.85 | 5.90 | 31.56 | 101.26 | 69.69 |
F | 16.95 | 22.81 | 5.86 | 31.98 | 100.71 | 68.73 |
CN | 16.95 | 21.60 | 4.65 | 27.88 | 83.93 | 56.05 |
X | ΔEAB/(kJ·mol-1) | ΔEBC/(kJ·mol-1) | ΔEAC(T)/(kJ·mol-1) | ΔEABC/(kJ·mol-1) | Ecoop/(kJ·mol-1) |
---|---|---|---|---|---|
NH2 | -94.27 | -31.48 | -14.32 | -181.00 | -40.94 |
CH3 | -94.27 | -29.38 | -11.43 | -168.82 | -39.43 |
H | -94.27 | -28.13 | -10.00 | -162.79 | -36.08 |
Br | -94.27 | -25.62 | -6.78 | -153.54 | -32.57 |
Cl | -94.27 | -25.66 | -6.74 | -153.24 | -32.27 |
F | -94.27 | -25.83 | -6.78 | -153.16 | -31.98 |
CN | -94.27 | -22.56 | -1.59 | -139.43 | -26.71 |
Table 8 Interaction energy(ΔE) of complexes and the cooperative energy (Ecoop) of ternary complexes H3S+…NCH2P…PyX
X | ΔEAB/(kJ·mol-1) | ΔEBC/(kJ·mol-1) | ΔEAC(T)/(kJ·mol-1) | ΔEABC/(kJ·mol-1) | Ecoop/(kJ·mol-1) |
---|---|---|---|---|---|
NH2 | -94.27 | -31.48 | -14.32 | -181.00 | -40.94 |
CH3 | -94.27 | -29.38 | -11.43 | -168.82 | -39.43 |
H | -94.27 | -28.13 | -10.00 | -162.79 | -36.08 |
Br | -94.27 | -25.62 | -6.78 | -153.54 | -32.57 |
Cl | -94.27 | -25.66 | -6.74 | -153.24 | -32.27 |
F | -94.27 | -25.83 | -6.78 | -153.16 | -31.98 |
CN | -94.27 | -22.56 | -1.59 | -139.43 | -26.71 |
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