Supporting Information Theoretical Investigations on 4,4’,5,5’-tetranitro-2,2’-1H,1’H2,2’-biimidazole derivatives as potential nitrogen-rich high energy materials Qing Maa,b, Tao Jiangb, Xiaoyu Zhangb, Guijuan Fanb, Jun Wangb* and Jinglun Huangb* a School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China b Institute of Chemical Materials, China Academy of Engineering Physics, Mianyang 621900, China E-mail: wangjun01@caep.cn; jinglunhuang@caep.cn A List of Contents ......................................................................................................S1 1. Cartesian coordinates of optimized geometries and the corresponding absolute energies……………………………………………………………………………….……...………………………………………………………………………………………….……. S2 2. Thermodynamic properties of the title molecules at different temperatures…………………………………………………………………………………………………………………….……...…………………………………………….. S8 Table S1. Thermodynamic properties of the title molecules at different temperatures…………………………………………………………………………………………………………………………………………….………. S8 Total: 9 pages S1 1. Cartesian coordinates of optimized geometries and the corresponding absolute energies Structure T1 N C C N C C N C C N N N N N O O O O O O O O H H 1.4700870 2.7433400 2.7881360 1.4794940 0.7224220 -0.7224190 -1.4700860 -2.7433420 -2.7881320 -1.4794890 3.8577920 3.8559140 -3.8577810 -3.8559070 4.5650100 3.9577880 3.5270310 4.9940240 -3.9577020 -4.5651500 -4.9940090 -3.5270180 1.1640760 -1.1640700 -1.1134120 -0.6729860 0.7118200 1.1183820 -0.0078780 0.0078890 1.1134200 0.6729900 -0.7118140 -1.1183740 -1.6261930 1.6623070 1.6262070 -1.6623040 -1.5966240 -2.3777500 2.8505460 1.2229920 2.3778500 1.5964720 -1.2229900 -2.8505430 2.0840470 -2.0840380 -0.0090710 -0.0056850 0.0162250 0.0228850 0.0033820 -0.0033690 0.0091010 0.0057090 -0.0162210 -0.0228600 -0.0440170 0.0747940 0.0440590 -0.0748000 -1.0396150 0.9136010 0.0239480 0.1789180 -0.9135000 1.0395450 -0.1790140 -0.0239990 0.0425550 -0.0425180 Zero-point correction= Thermal correction to Energy= Thermal correction to Enthalpy= Thermal correction to Gibbs Free Energy= Sum of electronic and zero-point Energies= Sum of electronic and thermal Energies= Sum of electronic and thermal Enthalpies= Sum of electronic and thermal Free Energies= Structure T2 N C -1.4327460 -2.7185580 1.1652170 0.7918580 0.0080010 -0.0162500 S2 0.131776 (Hartree/Particle) 0.149914 0.150858 0.080706 -1269.286492 -1269.268355 -1269.267410 -1269.337562 C N C C N C C N N N N N N N O O O O O O O O H H H H -2.8263500 -1.5344090 -0.7212300 0.7212710 1.4328800 2.7186540 2.8263300 1.5343650 -1.1479300 1.1477250 -3.7782540 -3.9581010 3.7784420 3.9579150 -3.5506230 -4.7962480 -3.8191780 -4.9576640 4.7962450 3.5510710 4.9575640 3.8188070 -1.6979080 -0.1414550 0.1414010 1.6982650 -0.5971920 -1.0699660 0.0311090 -0.0312940 -1.1653630 -0.7918980 0.5971570 1.0698250 -2.3962580 2.3960550 1.7885650 -1.4834800 -1.7884880 1.4835570 2.8856910 1.4475380 -2.5820620 -1.0910390 -1.4473720 -2.8855880 1.0908710 2.5824780 -2.9862690 -2.4584860 2.4583330 2.9862010 -0.0414720 -0.0173510 0.0001280 -0.0001010 -0.0081970 0.0159180 0.0415290 0.0172480 -0.2252620 0.2251420 0.0900420 -0.0891460 -0.0906460 0.0898670 -0.4011900 0.6805700 0.4601740 -0.6673490 -0.6814460 0.4007600 0.6677600 -0.4587730 0.3977760 -0.0483490 0.0474030 -0.3972720 Zero-point correction= Thermal correction to Energy= Thermal correction to Enthalpy= Thermal correction to Gibbs Free Energy= Sum of electronic and zero-point Energies= Sum of electronic and thermal Energies= Sum of electronic and thermal Enthalpies= Sum of electronic and thermal Free Energies= Structure T3 N C C N C C -1.2700780 -2.6271190 -2.8207640 -1.6398240 -0.7148900 0.7141100 -1.3578630 -1.1783410 0.1950770 0.8436990 -0.1179130 0.1162750 0.1557130 0.1687950 0.1926680 0.1889270 0.1718470 0.1718760 S3 0.168859 (Hartree/Particle) 0.189004 0.189948 0.117535 -1379.580630 -1379.560485 -1379.559541 -1379.631955 N C C N N N N N N N O O O O O O O O O O O O H H 1.2689800 2.6260970 2.8200490 1.6393190 -1.2399490 1.2432350 -3.5192200 -4.0724990 3.5184100 4.0722330 -4.7056480 -2.9998800 -4.8633390 -4.1988420 2.9992270 4.7051600 4.8600440 4.2017860 -2.1078250 -0.2646450 0.2635750 2.1119140 -0.7879670 0.7865990 1.3563250 1.1771000 -0.1961740 -0.8451680 3.9236860 -3.9180680 -2.3009410 0.9529090 2.2993560 -0.9533510 -2.0666010 -3.4123370 0.6331070 1.8596830 3.4110770 2.0643390 -0.6371810 -1.8559620 4.7125200 3.9352330 -3.9356430 -4.7055530 -2.2612970 2.2596100 0.1552010 0.1686090 0.1931900 0.1895860 -0.7806070 -0.7797130 0.0966340 0.2588840 0.0964950 0.2595230 -0.0907040 0.2159620 1.1337460 -0.5525680 0.2133890 -0.0883060 1.1383930 -0.5560210 -0.9815340 -0.0669960 -0.0721320 -0.9824060 0.1136830 0.1133260 Zero-point correction= Thermal correction to Energy= Thermal correction to Enthalpy= Thermal correction to Gibbs Free Energy= Sum of electronic and zero-point Energies= Sum of electronic and thermal Energies= Sum of electronic and thermal Enthalpies= Sum of electronic and thermal Free Energies= Structure T4 N C C N C C N C 1.2774780 2.6188990 2.8860290 1.6636530 0.7105170 -0.7105600 -1.2774960 -2.6189290 -1.3063290 -1.0768930 0.2652310 0.8844650 -0.1261780 0.1259660 1.3061160 1.0767100 -0.4956050 -0.5089410 -0.3887870 -0.2959210 -0.3563680 -0.3564360 -0.4958100 -0.5090140 S4 0.150734 (Hartree/Particle) 0.178626 0.179570 0.080910 -1679.437204 -1679.409312 -1679.408368 -1679.507028 C N N N N N N N O O O O O O O O N H H N O O O O -2.8860900 -1.6637320 1.5076210 -1.5077580 3.5931810 4.1255540 -3.5931970 -4.1256320 4.7699370 3.1735520 4.5151770 4.6261560 -3.1736130 -4.7698980 -4.6292100 -4.5122920 1.2365420 0.6933120 -0.6936840 -1.2363860 0.8076530 1.5224600 -1.5225940 -0.8070310 -0.2653850 -0.8846240 2.2357980 -2.2358660 -2.1416220 1.0458840 2.1413690 -1.0460220 -1.7850240 -3.2818340 1.4049100 1.2783920 3.2817440 1.7845450 -1.2738570 -1.4096660 2.5344800 2.6017750 -2.6022280 -2.5339310 3.6488300 1.6724520 -1.6717300 -3.6480450 -0.3886580 -0.2956650 -0.0693640 -0.0684750 -0.6537300 -0.3957400 -0.6544140 -0.3955480 -0.6455620 -0.7718500 -1.4948690 0.6904620 -0.7711010 -0.6482070 0.6902380 -1.4942320 1.3696330 -0.5723150 -0.5715140 1.3705310 1.5404760 2.1657400 2.1663690 1.5417620 Zero-point correction= Thermal correction to Energy= Thermal correction to Enthalpy= Thermal correction to Gibbs Free Energy= Sum of electronic and zero-point Energies= Sum of electronic and thermal Energies= Sum of electronic and thermal Enthalpies= Sum of electronic and thermal Free Energies= Structure T5 N C C N C C N C -0.0064700 0.9994650 2.0333960 1.6184250 0.3740980 -0.3796070 0.1497430 -0.8837260 1.8128410 2.7007600 2.1626880 0.8769830 0.7248400 -0.5129920 -1.7122600 -2.5706450 -1.1089560 -0.9609480 -0.2256090 0.0966880 -0.4654190 -0.4562000 -0.5323050 -0.6919620 S5 0.167818 (Hartree/Particle) 0.193938 0.194882 0.104714 -1788.901301 -1788.875181 -1788.874237 -1788.964405 C N N N N N N N O O O O O O O O C H H C N N N N N N O O O O O O O O O O O O -2.0856000 -1.7597850 2.2331390 -2.6230930 0.8640230 3.3071830 -0.6187120 -3.4369890 1.4815280 0.1326400 3.7170870 3.8726900 0.4104810 -1.4429550 -3.7711110 -4.1105140 3.1316600 2.5839630 -2.4272840 -3.2756590 2.8628750 4.6084040 3.1211560 -3.6897460 -2.4580210 -4.5597000 3.7800710 1.8108720 5.4795150 4.7035290 3.0322490 3.2506710 -4.0905270 -3.5706520 -3.0762880 -1.2704210 -4.3238610 -5.6309880 -1.9007390 -0.5641880 -0.0374230 0.5117780 4.0578810 2.6840900 -3.9952300 -2.3601480 4.9332180 4.1962740 2.2816370 3.4627230 -4.4236010 -4.6225310 -3.4129430 -1.6392590 -1.0240670 0.4179350 1.2227060 0.9715230 -2.3884540 -0.7090630 -1.2647540 2.4531190 0.9976560 0.1531690 -3.1835940 -2.4861820 -0.8311520 -0.3698170 -2.4051970 -0.2417760 3.0422500 2.8656470 0.8122150 1.2542730 -1.0065010 0.7042140 -0.7472390 -0.5609160 0.9370060 -0.5651780 -1.4838200 0.1930420 -0.8747500 -1.0127790 -0.8865990 -2.4538280 1.2900310 -0.5535640 -0.3720770 -1.5309890 -0.4972750 -1.7466710 0.4740970 1.7810580 -1.2688790 0.5744790 1.2341330 0.8885800 -1.0362990 0.3317920 1.9142450 0.8964860 1.1598310 1.8240380 0.0564480 2.0585200 -1.4284420 -1.6974790 1.3117810 -0.8096830 2.9377540 1.7802260 1.1961910 0.7695170 Zero-point correction= Thermal correction to Energy= Thermal correction to Enthalpy= Thermal correction to Gibbs Free Energy= Sum of electronic and zero-point Energies= 0.231768 (Hartree/Particle) 0.270898 0.271842 0.152527 -2685.068643 S6 Sum of electronic and thermal Energies= Sum of electronic and thermal Enthalpies= Sum of electronic and thermal Free Energies= Structure T6 N C C N C C N C C N N N N N N N O O O O O O O O C H H C N N F N F N O O O O 0.0038130 -1.0297810 -2.1099340 -1.6974270 -0.3999660 0.4377430 0.0392320 1.1289240 2.2355060 1.8102050 -2.4156870 2.6551030 -0.8783720 -3.3775240 1.0804730 3.6179860 -1.1503360 -0.4703330 -3.9460970 -3.7806160 -0.0063920 2.1620560 3.8084890 4.4449880 -3.1973250 -2.9051600 2.3407900 3.0538330 -3.6391940 -4.5353070 -2.5334800 3.2510470 2.2063570 4.4612670 -3.8329000 -3.7642190 -4.3562930 -5.5785740 -1.6846940 -2.5289700 -1.8789930 -0.5553450 -0.4972290 0.6896750 1.9310230 2.7146440 1.9569880 0.6514320 0.5218330 -0.4196830 -3.9538390 -2.3709250 4.1607990 2.2999640 -4.7433560 -4.2109470 -1.7005310 -3.4111610 4.6740210 4.7365530 2.7278160 2.1035840 1.2622830 0.2927090 -1.0079890 -1.2041800 2.5800890 0.5495920 1.5194060 -2.6813030 -1.1999650 -0.7808870 3.5167670 2.5186830 -0.3739420 0.9412300 -0.5729300 -0.3816250 0.1721160 0.3215780 -0.1340310 -0.1413490 0.0407020 -0.1259450 -0.4267970 -0.4197720 0.8170870 -0.6798430 -0.6996190 0.6324340 0.0161990 -0.7580500 0.1928080 -1.8206750 1.5032670 0.1440230 0.2232150 -0.0860270 -1.8826220 0.1191020 -0.1087270 1.6799300 -1.4537630 0.4340770 0.5803170 -0.5691530 -1.2275870 -0.0347820 1.4678560 0.9877320 -0.1593520 1.7904710 -1.3453420 -0.0941020 S7 -2685.029514 -2685.028569 -2685.147884 O O O O 3.5540320 3.0708380 4.4949610 5.3710420 -3.4498840 -2.9160020 -0.3360070 -0.9494950 0.8508130 -1.2154700 2.1120860 0.1992790 Zero-point correction= Thermal correction to Energy= Thermal correction to Enthalpy= Thermal correction to Gibbs Free Energy= Sum of electronic and zero-point Energies= Sum of electronic and thermal Energies= Sum of electronic and thermal Enthalpies= Sum of electronic and thermal Free Energies= 0.211565 (Hartree/Particle) 0.247064 0.248008 0.136187 -2475.031374 -2474.995874 -2474.994930 -2475.106752 2. Thermodynamic properties of the title molecules at different temperatures Table S1. Thermodynamic properties of the title molecules at different temperatures T/K T1 500.0 600.0 700.0 800.0 C p ,m /J·mol-1·K-1 213.49 282.31 341.76 389.42 426.10 454.02 475.41 S m / J·mol-1·K-1 787.04 861.43 929.31 991.40 82.98 119.64 160.50 204.57 251.08 C p ,m /J·mol-1·K-1 244.39 324.18 391.54 445.67 487.73 520.16 545.39 S m / J·mol-1·K-1 846.56 931.70 1009.43 1080.61 93.65 135.62 182.38 232.84 286.17 C p ,m /J·mol-1·K-1 313.33 388.91 455.79 510.21 552.48 584.84 609.71 H m / kJ·mol-1 T2 H m / kJ·mol-1 T3 S m / J·mol-1·K-1 H m / kJ·mol-1 T4 200.0 300.0 400.0 516.00 615.81 705.43 26.83 51.68 535.76 650.34 753.14 29.23 57.76 731.04 872.56 993.87 1101.67 1198.59 1286.30 1366.09 78.23 120.56 168.97 222.20 279.14 338.92 C p ,m /J·mol-1·K-1 288.95 381.42 459.18 520.90 568.24 604.24 631.77 S m / J·mol-1·K-1 973.19 1072.54 1162.97 1245.53 H m / kJ·mol-1 43.07 607.96 743.05 863.81 35.16 68.79 110.95 S8 160.09 214.65 273.36 335.22 T5 C p ,m /J·mol-1·K-1 467.91 541.65 602.73 S m / J·mol-1·K-1 H m / kJ·mol-1 T6 653.59 706.93 751.00 794.30 794.56 901.24 994.75 1082.78 1168.97 1249.84 1335.80 54.30 108.54 175.74 252.98 337.71 427.97 522.34 C p ,m /J·mol-1·K-1 447.27 502.34 554.50 600.77 645.96 690.61 729.20 S m / J·mol-1·K-1 H m / kJ·mol-1 793.56 882.57 962.73 1040.71 1119.47 1201.13 1280.10 51.91 102.34 164.34 S9 235.31 312.95 395.51 481.72