L energy surface for the CH3F + Cl reaction program is shown in Fig. 2a. The H-abstraction reaction CH3F + Cl is actually a weakly exothermic approach. The calculated reaction enthalpy is of -5.9 kJ mol -1 at 0 K. The post-reaction adduct, CH two F…HCl (MC2F) may be the lowest energy molecular structure formed through the reaction. The prospective energy of MC2F at 0 K calculated in the G2 level is by 9.8 kJ mol-1 lower than the reactants’ energy. The thermal stability of MC2F with respect to the reaction solutions, CH2F + HCl is estimated of four.8 kJ mol-1 at 0 K. The initial elementary step is related to an power barrier determined by the energy on the transition state, CH2F…H…Cl (TS1F). The height on the energy barrier is comparatively smaller of 9.9 kJ mol-1, which indicates that the decay in the reactants must be a quick course of action, using the rate constant of ten – 1 three cm three molecule – 1 s – 1 at space temperature. In the case in the reactions CH3Cl/CH3Br + Cl, the Habstraction method requires three elementary methods:CH3 X ?Cl ! CH3 X . . . Cl ! CH2 X . . . HCl ! CH2 X ?HCl;??exactly where X 0 Cl, Br. The hydrogen abstraction from CH3Cl and CH3Br by chlorine atom is a lot more exothermic compared using the reaction of CH3F + Cl. The profiles from the prospective energy surface for these reaction systems are also shown in Fig. 2a. The first and third elementary processes areJ Mol Model (2013) 19:1489?505 Table 1 Molecular properties in the reactants and products on the reactions below investigation calculated at the G2 levela) CH3F (C3v) 1.1427158-38-0 In stock 390 1.092 109.14 109.81 157.134 25.454 25.454 1059 1171 1171 1475 1476 1476 2887 2958 2958 -139.55421 CD3F (Cs) 78.627 20.353 20.353 897 897 980 1072 1072 1163 2066 2198 2198 -139.56353 CH2F 1.350 1.081 122.16 114.28 262.823 30.431 27.626 768 1133 1143 1443 2963 3089 -138.89290 CD2F 133.088 25.982 CH3Cl (C3v) 1.777 1.088 108.91 110.03 157.847 13.375 13.375 699 1016 1016 1373 1454 1454 2917 3010 3010 -499.55382 CD3Cl (Cs) 78.984 10.883 ten.883 667 762 762 1037 1053 1053 2086 2237 2237 -499.56307 CH2Cl 1.701 1.078 122.90 117.45 275.192 15.849 15.012 440 780 975 1382 2998 3129 -498.89566 CD2Cl 138.110 13.497 CH3Br (C3v) 1.947 1.086 107.85 111.04 156.354 9.519 9.519 570 945 945 1323 1451 1451 2930 3032 3032 -2612.39042 CD3Br (Cs) 78.237 7.666 7.666 537 702 702 999 1052 1052 2093 2253 2253 -2612.39962 CH2Br 1.Formula of 7-Chloropyrido[3,4-b]pyrazine 863 1.PMID:23819239 079 122.52 116.74 272.310 11.245 ten.823 450 632 901 1352 2993 3128 -2611.73031 CD2Br 136.945 9.C-X C-H H-C-X H-C-H A B C 1 two three 4 five six 7 eight 9 E0(G2) A B C 1 two three 4 five six 7 8 9 E0(G2) C-X C-H X-C-H H-C-H A B C 1 2 three 4 five 6 E0(G2) A B1036 1147 1147 1457 1465 1465 2913 3006(1049) (1182) (1182) (1464) (1467) (1467) (2930) (3006) (3006)747 1031 1031 1395 1469 1469 2997 3103(732) (1017) (1017) (1355) (1452) (1452) (2937) (3039) (3039)591 939 939 1309 1442 1442 2958 3074(611) (955) (955) (1306) (1443) (1443) (2935) (3056) (3056)878 878 961 1064 1064 1145 2085 2234(903) (903) (991) (1072) (1072) (1136) (2110) (2258) (2258)709 775 775 1057 1063 1063 2145 2305(701) (768) (768) (1029) (1060) (1060) (2160) (2283) (2283)555 699 699 991 1046 1046 2115 2283(577) (713) (713) (992) (1056) (1056) (2160) (2297) (2297)707 1128 1134 1445 3014(1170) (1223) (1420) (3044) (3184)316 840 1006 1422 3106(395) (829) (1391) (3055)400 666 912 1362 3048(368) (693) (953) (1356)1494 Table 1 (continued) C 1 2 3 4 five 6 E0(G2)a)J Mol Model (2013) 19:1489?22.096 604 875 991 1184 2137 2310 -138.556 868 988 1183 2173(976) (1011) (1191) (2176)12.324 344 731 739 1031 2161 2339 -498.247 75.