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Computational Chemistry Comparison and Benchmark DataBase Release 22 (May 2022) Standard Reference Database 101 National Institute of Standards and Technology |
You are here: Calculated > Vibrations > Bad Calculations > Bad vib. Calc. vs exp. OR Resources > Bad Calculations > Vibrations > Bad vib. Calc. vs exp. |
Calculated frequencies that differ from experiment by more than 400 cm-1 or have a ratio with experiment outside of 0.7 to 1.2 are listed
Calculated vibrational frequencies ("theory" in table) are calculated at
MP2/CEP-121G*
Calculated values were scaled by 0.9528.
Species | Name | mode | int rot | Symmetry | Experiment | Theory | difference | ratio |
---|---|---|---|---|---|---|---|---|
C4H10O | Ethoxy ethane | 12 | A1 | 240 | 185 | -55 | 1.298 | |
C4H10O | Ethoxy ethane | 20 | A2 | 137 | 76 | -61 | 1.812 | |
CH3CONH2 | Acetamide | 20 | A | 259 | 390 | 131 | 0.663 | |
CH3COOH | Acetic acid | 18 | torsion | A" | 93 | 52 | -41 | 1.790 |
CH3OH | Methyl alcohol | 12 | torsion | A" | 200 | 337 | 137 | 0.593 |
C6H6 | Benzene | 7 | B2g | 995 | 775 | -220 | 1.285 | |
C6H6 | Benzene | 8 | B2g | 703 | -870 | -1573 | -0.808 | |
C6H6 | Benzene | 19 | E2u | 975 | 708 | -267 | 1.377 | |
CH3CCl3 | Ethane, 1,1,1-trichloro- | 6 | torsion | A2 | 214 | 323 | 109 | 0.663 |
C2H2 | Acetylene | 4 | Πg | 612 | 334 | -278 | 1.834 | |
HCN+ | hydrogen cyanide cation | 1 | Σ | 3050 | 3809 | 759 | 0.801 | |
HCN+ | hydrogen cyanide cation | 2 | Σ | 1800 | 2794 | 994 | 0.644 | |
CH3CCH | propyne | 9 | E | 633 | 499 | -134 | 1.268 | |
CHONH2 | formamide | 12 | torsion | A" | 289 | -282 | -571 | -1.023 |
CH3SCH3 | Dimethyl sulfide | 11 | torsion | A2 | 175 | 139 | -36 | 1.261 |
CH3SCH3+ | dimethyl sulfide cation | 15 | B1 | 172 | 128 | -44 | 1.347 | |
C3F8 | perfluoropropane | 13 | A2 | 276 | 214 | -62 | 1.287 | |
CH3COOCH3 | methyl acetate | 27 | torsion | A" | 110 | 17 | -93 | 6.561 |
C13H10 | Fluorene | 24 | A2 | 977 | 737 | -240 | 1.325 | |
C13H10 | Fluorene | 25 | A2 | 944 | 708 | -236 | 1.333 | |
C13H10 | Fluorene | 27 | A2 | 782 | 616 | -166 | 1.270 | |
C13H10 | Fluorene | 29 | A2 | 566 | 262 | -304 | 2.163 | |
C13H10 | Fluorene | 30 | A2 | 430 | 234 | -196 | 1.839 | |
C13H10 | Fluorene | 31 | A2 | 270 | 122 | -148 | 2.218 | |
C13H10 | Fluorene | 32 | A2 | 129 | -795 | -924 | -0.162 | |
C10H8 | naphthalene | 10 | Au | 970 | 711 | -259 | 1.364 | |
C10H8 | naphthalene | 12 | Au | 581 | 165 | -416 | 3.530 | |
C10H8 | naphthalene | 13 | Au | 195 | -693 | -888 | -0.281 | |
C10H8 | naphthalene | 14 | B1g | 943 | 719 | -224 | 1.311 | |
C10H8 | naphthalene | 16 | B1g | 386 | 304 | -82 | 1.271 | |
C10H8 | naphthalene | 25 | B2g | 980 | 759 | -221 | 1.291 | |
C10H8 | naphthalene | 26 | B2g | 876 | 665 | -211 | 1.317 | |
C10H8 | naphthalene | 27 | B2g | 770 | 262 | -508 | 2.934 | |
C10H8 | naphthalene | 28 | B2g | 461 | -1328 | -1789 | -0.347 | |
C10H8 | naphthalene | 45 | B3u | 958 | 737 | -221 | 1.300 | |
C10H8 | naphthalene | 47 | B3u | 476 | 334 | -142 | 1.425 | |
C9H8 | Indene | 36 | A" | 917 | 721 | -197 | 1.273 | |
C9H8 | Indene | 40 | A" | 690 | 443 | -247 | 1.557 | |
C9H8 | Indene | 41 | A" | 549 | 313 | -236 | 1.754 | |
C9H8 | Indene | 42 | A" | 415 | 302 | -112 | 1.371 | |
C9H8 | Indene | 43 | A" | 388 | 187 | -201 | 2.076 | |
C9H8 | Indene | 45 | A" | 189 | -689 | -877 | -0.274 | |
C6H4Cl2 | 1,2-dichlorobenzene | 12 | A2 | 975 | 730 | -245 | 1.336 | |
C6H4Cl2 | 1,2-dichlorobenzene | 14 | A2 | 695 | 334 | -361 | 2.081 | |
C6H4Cl2 | 1,2-dichlorobenzene | 15 | A2 | 504 | 122 | -382 | 4.135 | |
C6H4Cl2 | 1,2-dichlorobenzene | 16 | A2 | 152 | -910 | -1062 | -0.167 | |
C6H4Cl2 | 1,2-dichlorobenzene | 17 | B1 | 940 | 727 | -213 | 1.293 | |
C6H4Cl2 | 1,4-dichlorobenzene | 7 | Au | 951 | 716 | -235 | 1.329 | |
C6H4Cl2 | 1,4-dichlorobenzene | 16 | B2g | 687 | 264 | -423 | 2.601 | |
C6H4Cl2 | 1,4-dichlorobenzene | 17 | B2g | 298 | -797 | -1095 | -0.374 | |
C6H4Cl2 | 1,4-dichlorobenzene | 29 | B3u | 485 | 379 | -106 | 1.281 | |
C6H4Cl2 | 1,4-dichlorobenzene | 30 | B3u | 122 | 94 | -28 | 1.303 | |
C6H4O2 | parabenzoquinone | 16 | B2g | 794 | 496 | -298 | 1.602 | |
C6H4O2 | parabenzoquinone | 17 | B2g | 241 | -302 | -543 | -0.799 | |
C6H4O2 | parabenzoquinone | 30 | B3u | 109 | 75 | -34 | 1.454 | |
CH3CH2CH2CH3 | Butane | 5 | Ag | 1442 | 408 | -1034 | 3.538 | |
CH3CH2CH2CH3 | Butane | 8 | Ag | 1151 | 817 | -334 | 1.408 | |
CH3CH2CH2CH3 | Butane | 30 | Bu | 1461 | 2915 | 1454 | 0.501 | |
CH3CH2CH2CH3 | Butane | 35 | Bu | 964 | 3006 | 2042 | 0.321 | |
C3H6O | 2-Propen-1-ol | 24 | A | 188 | 105 | -83 | 1.794 | |
CH2ClCHO | chloroacetaldehyde | 15 | torsion | A | 27 | 52 | 25 | 0.515 |
CH2ClCHO | chloroacetaldehyde | 15 | A" | 59 | 142 | 83 | 0.416 | |
C4H2O3 | Maleic Anhydride | 11 | A2 | 275 | 192 | -83 | 1.434 | |
C5H12 | Pentane | 23 | A2 | 131 | 92 | -39 | 1.430 | |
C3H2N2 | Malononitrile | 6 | A1 | 167 | 130 | -37 | 1.283 | |
C4H5N | Pyrrole | 10 | A2 | 864 | 674 | -190 | 1.281 | |
C4H5N | Pyrrole | 12 | A2 | 614 | 407 | -207 | 1.507 | |
C4H4O | Furan | 11 | A2 | 603 | 385 | -218 | 1.566 | |
C4H4S | Thiophene | 11 | A2 | 567 | 418 | -149 | 1.358 | |
CHSNH2 | thioformamide | 12 | A" | 393 | -128 | -521 | -3.075 | |
CH2C(CH3)CH3 | 1-Propene, 2-methyl- | 15 | torsion | A2 | 193 | 140 | -53 | 1.379 |
C3F6 | hexafluoropropene | 21 | A" | 60 | 35 | -25 | 1.710 | |
C2Cl4 | Tetrachloroethylene | 7 | B2g | 512 | 344 | -168 | 1.490 | |
C5H8 | Cyclopentene | 18 | torsion | A' | 254 | 175 | -79 | 1.451 |
C4H4N2 | Pyridazine | 12 | A2 | 751 | 433 | -318 | 1.735 | |
C4H4N2 | Pyridazine | 13 | A2 | 421 | 217 | -204 | 1.937 | |
C6F6 | hexafluorobenzene | 7 | B2g | 719 | 249 | -470 | 2.890 | |
C6F6 | hexafluorobenzene | 8 | B2g | 205 | -138 | -343 | -1.487 | |
NH2CN | cyanamide | 5 | torsion | A' | 408 | 731 | 323 | 0.558 |
C4H6O2 | 2,3-Butanedione | 21 | torsion | Bg | 240 | 108 | -132 | 2.218 |
CH(CN)3 | tricyanomethane | 12 | E | 149 | 117 | -32 | 1.272 | |
C4H2 | Diacetylene | 6 | Πg | 627 | 1132 | 505 | 0.554 | |
CH2FCH2CH3 | 1-Fluoropropane | 13 | A' | 1391 | 996 | -395 | 1.397 | |
CH2CO | Ketene | 6 | B1 | 528 | 396 | -132 | 1.333 | |
C6H6 | Fulvene | 15 | A2 | 494 | 370 | -124 | 1.335 | |
C3H6O | Oxetane | 18 | B1 | 90 | -88 | -178 | -1.017 | |
C3O2 | Carbon suboxide | 7 | Πu | 61 | 169 | 108 | 0.360 | |
HCNO | fulminic acid | 5 | torsion | Π | 224 | -386 | -610 | -0.581 |
C6H4F2 | 1,4-difluorobenzene | 16 | B2g | 692 | 385 | -307 | 1.797 | |
C6H4F2 | 1,4-difluorobenzene | 18 | B2g | 374 | -292 | -666 | -1.282 | |
C6H4Cl2 | 1,3-dichlorobenzene | 13 | A2 | 532 | 400 | -132 | 1.328 | |
C6H4Cl2 | 1,3-dichlorobenzene | 15 | B1 | 964 | 747 | -217 | 1.290 | |
C6H4Cl2 | 1,3-dichlorobenzene | 18 | B1 | 672 | 359 | -313 | 1.873 | |
C6H4Cl2 | 1,3-dichlorobenzene | 19 | B1 | 433 | 153 | -280 | 2.825 | |
C6H4Cl2 | 1,3-dichlorobenzene | 20 | B1 | 175 | -705 | -880 | -0.248 | |
C5H8 | 1,4-Pentadiene | 16 | A | 137 | 289 | 152 | 0.474 | |
HCCCl | Chloroacetylene | 4 | Π | 604 | 474 | -130 | 1.273 | |
HCCCl | Chloroacetylene | 5 | Π | 326 | 144 | -182 | 2.267 | |
P(CH3)3 | trimethylphosphine | 22 | E | 259 | 181 | -78 | 1.427 | |
C5H6S | Thiophene, 3-methyl- | 27 | A" | 594 | 429 | -165 | 1.386 | |
CH3SSCH3 | Disulfide, dimethyl | 13 | torsion | A | 117 | 86 | -31 | 1.363 |
CO+ | carbon monoxide cation | 1 | Σ | 2184 | 2714 | 530 | 0.805 | |
C6H6 | Benzvalene | 10 | A1 | 996 | 728 | -268 | 1.369 | |
C2F2 | difluoroacetylene | 4 | Πg | 270 | 104 | -166 | 2.603 | |
H2CS- | thioformaldehyde anion | 4 | B1 | 450 | -178 | -628 | -2.527 | |
CH2CHSH | Ethenethiol | 13 | A" | 972 | 737 | -235 | 1.320 | |
CH2ClCCCl | 1,3-dichloropropyne | 14 | A" | 337 | 174 | -163 | 1.940 | |
CH2ClCCCl | 1,3-dichloropropyne | 15 | A" | 176 | 135 | -41 | 1.306 | |
LiOH | lithium hydroxide | 3 | Π | 257 | 385 | 129 | 0.665 | |
SiF2+ | Silicon difluoride cation | 2 | A1 | 350 | 275 | -75 | 1.271 | |
C5H8 | 1,3-Pentadiene, (Z)- | 22 | A' | 144 | 213 | 69 | 0.677 | |
C5H8 | 1,3-Pentadiene, (Z)- | 31 | A" | 456 | 305 | -151 | 1.496 | |
C5H8 | 1,3-Pentadiene, (Z)- | 32 | A" | 171 | 103 | -68 | 1.665 | |
CH2NH+ | Methanimine cation | 4 | A' | 1370 | 1785 | 415 | 0.767 | |
CN | Cyano radical | 1 | Σ | 2042 | 2661 | 619 | 0.768 | |
C6H5O | phenoxy radical | 19 | B1 | 472 | 175 | -297 | 2.692 | |
C2H | Ethynyl radical | 2 | Σ | 1841 | 2307 | 466 | 0.798 | |
C2H | Ethynyl radical | 3 | torsion | Π | 372 | 785 | 413 | 0.474 |
C2H+ | Ethynyl cation | 3 | Π | 550 | 802 | 253 | 0.685 | |
CH3OO | methylperoxy radical | 12 | torsion | A" | 170 | 126 | -44 | 1.354 |
CH3 | Methyl radical | 2 | torsion | A2" | 606 | 405 | -201 | 1.496 |
C6H5 | phenyl | 17 | B1 | 655 | 452 | -203 | 1.448 | |
C6H5 | phenyl | 18 | B1 | 415 | 150 | -265 | 2.768 | |
CH2OH | Hydroxymethyl radical | 8 | torsion | A | 482 | 758 | 276 | 0.636 |
CH2OH | Hydroxymethyl radical | 9 | torsion | A | 234 | 448 | 214 | 0.522 |
C6H8 | (Z)-hexa-1,3,5-triene | 11 | A1 | 1136 | 854 | -282 | 1.330 | |
C6H8 | (Z)-hexa-1,3,5-triene | 18 | A2 | 331 | 248 | -83 | 1.334 | |
C6H8 | (Z)-hexa-1,3,5-triene | 19 | torsion | A2 | 264 | 103 | -161 | 2.570 |
C6H8 | (Z)-hexa-1,3,5-triene | 24 | torsion | B1 | 358 | 88 | -270 | 4.068 |
HCCN | cyanomethylene | 5 | Π | 129 | -540 | -668 | -0.239 | |
CCl3 | Trichloromethyl radical | 2 | A1 | 251 | 366 | 115 | 0.685 | |
C6H6 | Trimethylenecycopropane | 9 | A2" | 885 | 693 | -192 | 1.277 | |
CHCl2 | dichloromethyl radical | 4 | A' | 190 | 293 | 103 | 0.649 | |
C4H6 | Methylenecyclopropane | 17 | B1 | 360 | 253 | -107 | 1.423 | |
CH2Cl | chloromethyl radical | 4 | B1 | 402 | -323 | -725 | -1.245 | |
HNC+ | hydrogen isocyanide cation | 2 | Σ | 2195 | 2632 | 436 | 0.834 | |
ClFO3 | Perchloryl fluoride | 6 | E | 405 | 314 | -91 | 1.288 | |
BF3+ | boron trifluoride cation | 5 | B2 | 1791 | 3274 | 1483 | 0.547 | |
O2+ | diatomic oxygen cation | 1 | Σg | 1873 | 1217 | -656 | 1.539 | |
HN3+ | Hydrazoic acid cation | 2 | A' | 1850 | 3189 | 1339 | 0.580 | |
HN3+ | Hydrazoic acid cation | 4 | A' | 850 | 644 | -206 | 1.321 | |
MgF2 | Magnesium fluoride | 3 | Πu | 165 | 116 | -49 | 1.419 | |
HOCl+ | hypochlorous acid cation | 3 | A' | 830 | 1308 | 478 | 0.634 | |
O3 | Ozone | 3 | B2 | 1042 | 2339 | 1297 | 0.445 | |
NO | Nitric oxide | 1 | Σ | 1876 | 3905 | 2029 | 0.480 | |
NO2 | Nitrogen dioxide | 3 | B2 | 1618 | 2039 | 421 | 0.794 | |
NO2+ | Nitrogen dioxide cation | 3 | Πu | 639 | 500 | -139 | 1.279 | |
N2O4 | Dinitrogen tetroxide | 9 | B2u | 265 | 177 | -88 | 1.501 | |
N2O3 | Dinitrogen trioxide | 9 | torsion | A" | 63 | 150 | 87 | 0.421 |
C3O | Tricarbon monoxide | 5 | Π | 109 | 241 | 132 | 0.452 | |
NaO2 | Sodium superoxide | 3 | B2 | 333 | 7486 | 7153 | 0.044 | |
Li2O | dilithium oxide | 3 | Πu | 112 | 83 | -29 | 1.345 | |
FO | Oxygen monofluoride | 1 | Σ | 1033 | 2267 | 1234 | 0.456 | |
SiC2 | Silicon dicarbide | 3 | B2 | 196 | -112 | -308 | -1.756 | |
C3 | carbon trimer | 3 | Πu | 63 | 307 | 244 | 0.206 | |
C5H5- | cylopentadienyl anion | 8 | E1" | 625 | 416 | -209 | 1.503 | |
C5H5- | cylopentadienyl anion | 14 | E2" | 600 | 104 | -496 | 5.751 | |
LiO2 | Lithium dioxide | 3 | B2 | 509 | 2580 | 2071 | 0.197 | |
MgOH | magnesium hydroxide | 3 | torsion | Π | 188 | 65 | -123 | 2.907 |
C4 | Carbon tetramer | 4 | Πg | 323 | 524 | 201 | 0.617 | |
SiH2D2 | silane-d2 | 6 | B1 | 2183 | 1563 | -620 | 1.396 | |
SiH2D2 | silane-d2 | 8 | B2 | 1601 | 2163 | 562 | 0.740 | |
PO | Phosphorus monoxide | 1 | Σ | 1220 | 5217 | 3997 | 0.234 | |
AlO | Aluminum monoxide | 1 | Σ | 965 | 589 | -376 | 1.638 | |
SCN | thiocyanato radical | 1 | Σ | 1942 | 2459 | 517 | 0.790 | |
ClOO | chloroperoxy radical | 2 | A' | 414 | 1024 | 610 | 0.404 | |
ClOO | chloroperoxy radical | 3 | A' | 201 | 466 | 265 | 0.432 | |
B4H10 | Tetraborane(10) | 11 | A1 | 785 | 570 | -215 | 1.377 | |
B4H10 | Tetraborane(10) | 12 | A1 | 559 | 231 | -328 | 2.420 | |
B4H10 | Tetraborane(10) | 19 | A2 | 662 | 410 | -252 | 1.614 | |
B4H10 | Tetraborane(10) | 36 | B2 | 236 | 355 | 119 | 0.664 | |
FSN | Thiazyl fluoride | 3 | A' | 366 | 287 | -79 | 1.276 | |
BH3PH3 | borane phosphine | 12 | E | 447 | 353 | -94 | 1.266 | |
B5H9 | pentaborane9 | 13 | B1 | 240 | 610 | 370 | 0.394 | |
B5H9 | pentaborane9 | 16 | B2 | 1036 | 774 | -262 | 1.339 | |
B5H9 | pentaborane9 | 18 | B2 | 600 | 474 | -126 | 1.266 | |
B5H9 | pentaborane9 | 22 | E | 1409 | 1074 | -335 | 1.312 | |
OPCl | Phosphorus oxychloride | 2 | A' | 308 | 478 | 170 | 0.645 | |
OPCl | Phosphorus oxychloride | 3 | A' | 492 | 279 | -213 | 1.762 | |
NCO | isocyanato radical | 1 | Σ | 1921 | 2353 | 432 | 0.816 | |
H2POH | Phosphinous acid | 9 | A" | 375 | 251 | -124 | 1.496 | |
Mg2 | Magnesium diatomic | 1 | Σg | 48 | 31 | -17 | 1.561 | |
ClOF3 | Chlorine trifluoride oxide | 5 | A' | 319 | 247 | -72 | 1.294 | |
ClOF3 | Chlorine trifluoride oxide | 6 | A' | 224 | 175 | -49 | 1.277 | |
ClOF3 | Chlorine trifluoride oxide | 9 | A" | 412 | 315 | -97 | 1.310 | |
CHFCl | Chlorofluoromethyl radical | 6 | A | 540 | 385 | -155 | 1.404 | |
H2CNCN | cyanamide, methylene | 3 | A' | 2208 | 2981 | 773 | 0.741 | |
SNO | Nitrogen oxide sulfide | 3 | A' | 792 | 503 | -289 | 1.576 | |
ONNO | NO dimer | 3 | A1 | 135 | 282 | 148 | 0.477 | |
ONNO | NO dimer | 4 | torsion | A2 | 117 | 259 | 142 | 0.452 |
AlNC | Aluminum isocyanide | 3 | Π | 100 | 152 | 52 | 0.656 | |
ClONO | chlorine nitrite | 4 | A' | 406 | 319 | -87 | 1.273 | |
ONONO | Nitrosyl nitrite | 9 | B2 | 380 | 240 | -140 | 1.585 |