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Based on the method of density functional theory B3LYP with a 6-311++G(d, p) basis set, the potential energy surface of conformational isomerization along the two-dimensional coordinates formed by the dihedral angles ϕ 1(C9N1C2C5) and ϕ 2(C16N1C9C12) in a range of –180°–180° is investigated. And 12 ground state conformers of triethylamine are identified. Furthermore,with the second-order Moller-Plesset perturbation theory MP2 on the same basis set level, the structures of six lower-energy conformers are optimized and their energy values are estimated. The results show that G1 and G1' with C 3symmetry are the most stable conformers and G4 and G4' with new methyl orientations are identified. In addition, some vibrational modes in the infrared spectra of G1–G4 are assigned and discussed. The infrared spectra of G1–G4 show that the intensity is weak in a range of 0–1600 cm –1, while the intensity is strong in a range of 2800–3300 cm –1. The characteristic vibration modes such as umbrella vibration and CH stretching vibration are assigned. The average shift of the corresponding infrared peaks on different conformations is estimated at less than 20 cm –1. -
Keywords:
- conformation isomerization/
- density-functional theory calculation/
- potential energy surface/
- infrared spectra
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Conformers ϕ1/(°) ϕ2/(°) ϕ3/(°) Energy/Hartree RelativeE/meV G1 (GGG) 155.42 155.60 155.64 –292.501669 0 G1' (G'G'G') 77.67 77.63 77.63 –292.501620 1.33 G2 (TG'G') –66.62 76.02 63.21 –292.500061 43.76 G3 (TGG) –64.76 165.17 151.59 –292.500061 43.76 G4 (GG'G'') 162.85 67.24 115.28 –292.499824 50.21 G4' (G'G''G) 67.24 115.26 162.86 –292.499824 50.21 G5 (G'GT) –167.71 –60.28 65.25 –292.499826 50.15 G6 (GGT) –75.99 –63.21 66.63 –292.500061 43.76 G7 (G'G'T) –165.17 –151.59 64.75 –292.500061 43.76 G8 (G'TG) 60.28 –65.24 167.73 –292.499826 50.15 G9 (GTG) 151.58 –64.74 165.19 –292.500061 43.76 G10 (TG'T) 56.64 –156.48 76.67 –292.497311 118.59 
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Conformers ϕ1/(°) ϕ2/(°) ϕ3/(°) Energy/Hartree RelativeE/meV G1 (GGG) 157.62 157.63 157.63 –291.559737 0 G1' (G'G'G') 79.53 79.53 79.53 –291.559737 0 G2 (TG'G') –66.91 75.27 57.80 –291.558559 32.06 G3 (TGG) –59.62 175.87 158.42 –291.558563 31.95 G4 (GG'G'') 166.11 67.66 117.32 –291.558516 33.23 G4' (G'G''G) 67.74 117.11 166.19 –291.558517 33.20 DownLoad:
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Modes Frequency /cm–1 Infrared /(arb. units) G1 G2 G3 G4 G1 G2 G3 G4 ν1 87.22 55.02 55.10 50.35 0.1532 0.0639 0.0639 0.0004 ν2 90.98 87.43 87.41 96.49 0.1978 0.1857 0.1857 0.0238 ν3 95.03 109.27 109.28 140.35 0.1084 0.2932 0.2933 0.7795 ν4 188.06 178.51 178.54 178.16 1.1011 2.0829 2.0830 1.1365 ν5 208.61 203.62 203.58 205.94 0.0793 0.0717 0.0724 0.0393 ν6 214.02 224.68 224.73 223.87 0.0468 0.0690 0.0687 0.1212 ν7 294.38 268.43 268.36 256.33 1.0986 0.3758 0.3757 0.1000 ν8 304.06 290.93 290.98 328.65 0.3330 1.0227 1.0225 1.6826 ν9 305.06 331.61 331.61 332.28 0.3301 0.6897 0.6908 0.3791 ν10 427.73 407.68 407.74 390.84 3.0184 1.9295 1.9286 1.8981 ν11 465.12 465.26 465.28 449.38 1.9245 2.3956 2.3948 1.6278 ν12 466.51 519.32 519.35 495.27 1.9272 6.0474 6.0464 0.2229 ν13 732.52 721.09 721.08 734.07 12.9402 9.4813 9.4797 10.9942 ν14 786.67 769.53 769.53 763.17 3.8307 4.3371 4.3412 6.1536 ν15 787.30 788.70 788.71 790.73 3.8921 2.6364 2.6346 1.2979 ν16 797.88 799.48 799.50 799.56 0.0602 1.6382 1.6374 1.5619 ν17 907.63 886.81 886.80 911.00 1.2513 1.6792 1.6806 1.3188 ν18 907.82 906.38 906.37 911.59 1.2450 1.3085 1.3102 0.5529 ν19 1002.59 983.42 983.41 1003.17 6.7677 11.0738 11.0739 5.7366 ν20 1059.24 1035.02 1035.00 1056.02 29.6466 8.2727 8.2697 18.7155 ν21 1059.73 1059.50 1059.46 1058.63 30.0288 30.8396 31.1034 16.0090 ν22 1065.72 1062.07 1062.06 1069.23 3.2100 8.4580 8.2166 30.8172 ν23 1078.10 1078.78 1078.77 1076.49 8.5384 3.6151 3.6028 1.3100 ν24 1078.68 1090.02 1090.04 1102.40 8.3190 28.7911 28.7831 8.1051 ν25 1145.20 1130.09 1130.09 1132.97 12.0682 10.1819 10.1824 19.8481 ν26 1208.09 1204.99 1204.96 1210.21 23.0883 18.4553 18.4412 17.6571 ν27 1208.58 1213.11 1213.11 1213.26 23.1735 25.1079 25.1196 35.4460 ν28 1295.98 1286.87 1286.86 1275.96 6.1543 5.5069 5.5346 4.4355 ν29 1299.90 1291.74 1291.73 1307.05 19.8870 19.0478 19.0085 20.9498 ν30 1301.08 1338.30 1338.29 1319.27 19.5949 13.3278 13.3106 1.2005 ν31 1368.21 1352.09 1352.09 1354.63 1.9917 11.3690 11.3924 37.8361 ν32 1369.16 1366.65 1366.64 1357.26 1.2772 3.0836 3.0821 5.3537 ν33 1377.64 1375.36 1375.35 1377.69 0.3191 3.9451 3.9459 0.5963 ν34 1388.04 1377.00 1377.00 1381.06 17.8509 14.4179 14.4269 19.6423 ν35 1388.15 1386.56 1386.55 1382.64 18.3740 20.6580 20.6282 12.8529 ν36 1388.87 1390.27 1390.26 1404.98 19.7944 15.6998 15.6974 5.4524 ν37 1457.17 1452.04 1452.05 1453.70 2.7473 4.8488 4.8565 5.2712 ν38 1457.42 1458.81 1458.81 1455.34 1.6935 4.5549 4.5301 0.3420 ν39 1457.69 1461.08 1461.08 1458.89 2.2572 2.7707 2.7867 3.6730 ν40 1462.71 1465.68 1465.67 1462.41 1.8527 2.0538 2.0584 4.0415 ν41 1470.31 1469.26 1469.25 1465.41 1.2048 3.4122 3.4014 0.0857 ν42 1470.92 1470.19 1470.18 1473.12 1.5336 1.3596 1.3783 3.1465 ν43 1480.41 1477.89 1477.88 1478.47 7.1590 2.9233 2.9249 1.5156 ν44 1481.40 1480.62 1480.60 1484.66 7.0152 14.8916 14.8851 10.1121 ν45 1485.83 1490.87 1490.86 1487.68 12.4306 1.4478 1.4478 14.3785 ν46 2840.18 2846.52 2846.55 2823.87 23.2447 36.5331 36.7500 30.6694 ν47 2840.74 2855.55 2855.62 2833.67 23.3082 133.4917 133.2390 190.3336 ν48 2852.73 2964.14 2964.10 2931.98 238.2268 28.9250 28.9420 52.7107 ν49 2966.71 2965.86 2965.83 2961.43 29.7433 22.5935 22.5842 24.4676 ν50 2967.27 2967.80 2967.77 2962.15 29.7303 26.9332 26.9495 32.0017 ν51 2967.73 2969.71 2969.69 2966.69 20.4277 26.6680 26.6499 55.0959 ν52 3005.55 2985.78 2985.82 2967.51 12.9188 19.0174 18.9607 9.9999 ν53 3006.00 2999.96 2999.91 2982.63 12.0858 16.2484 16.2880 1.3433 ν54 3009.33 3003.92 3003.90 2993.29 0.0669 7.0967 7.1223 29.3355 ν55 3025.88 3022.39 3022.35 3025.08 9.0331 39.4849 39.4879 51.7362 ν56 3028.87 3026.72 3026.71 3026.92 48.6932 15.0249 15.0950 24.4990 ν57 3029.12 3029.64 3029.64 3028.60 44.4949 61.7552 61.8929 54.1919 ν58 3037.74 3031.73 3031.72 3036.45 53.6899 42.2463 42.0251 3.3194 ν59 3039.70 3037.26 3037.24 3037.37 45.2729 52.3351 52.2987 69.7071 ν60 3040.26 3040.20 3040.20 3041.40 46.0316 44.4987 44.5093 31.7214 DownLoad:
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