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List of experimental bond lengths for bond type rC=C

Bond lengths in Å.
Click on an entry for more experimental geometry data.
bond type Species Name Length Comment
rC=C C2 Carbon diatomic 1.243 re
rC=C C3O2 Carbon suboxide 1.251 crystal structure
rC=C C2H2+ acetylene cation 1.253 rz
rC=C C3 carbon trimer 1.277
rC=C F2CCCF2 tetrafluoroallene 1.282
rC=C H2CCCCH2 Butatriene 1.283
rC=C C3H4 cyclopropene 1.296
rC=C C4H6 1-Methylcyclopropene 1.300 !assumed
rC=C CH2CCHCH3 1,2-Butadiene 1.301
rC=C C2H2CO cyclopropenone 1.302
rC=C C4 Carbon tetramer 1.304 assumed all CC bonds equal
rC=C C3H4O Methylketene 1.306
rC=C CH2CCH2 allene 1.308
rC=C C2F4 Tetrafluoroethylene 1.311
rC=C CH2CO Ketene 1.314
rC=C CH2CCHCH3 1,2-Butadiene 1.314 from end
rC=C CH2CS Thioketene 1.314
rC=C C2H3 vinyl 1.316
rC=C CHClCHCl Ethene, 1,2-dichloro-, (Z)- 1.317
rC=C H2CCCCH2 Butatriene 1.318
rC=C C2H2F2 Ethene, 1,2-difluoro-, (Z)- 1.324
rC=C CH2CCl2 Ethene, 1,1-dichloro- 1.324
rC=C CH2CHOH ethenol 1.326
rC=C C2H2ClF 1-chloro-1-fluoroethylene 1.327
rC=C C2H2F2 Ethene, 1,2-difluoro-, (E)- 1.329
rC=C CH2CHF Ethene, fluoro- 1.329
rC=C C3F6 hexafluoropropene 1.329 held equal to rC-F
rC=C CH2C(CH3)CH3 1-Propene, 2-methyl- 1.330
rC=C CH2C(CH3)OCH3 1-Propene, 2-methoxy- 1.330
rC=C C6H6 Trimethylenecycopropane 1.330
rC=C C5H8 Cyclobutane, methylene- 1.331
rC=C C3H2O3 vinylene carbonate 1.331
rC=C C6H8 Bicyclo[2.1.1]hex-2-ene 1.332
rC=C C4H6 Methylenecyclopropane 1.332
rC=C C4H2O3 Maleic Anhydride 1.332
rC=C C2H3Cl Ethene, chloro- 1.332
rC=C C2H3Br vinyl bromide 1.332
rC=C CH2CHCH2F Allyl Fluoride 1.333
rC=C C5H10 2-Pentene, (E)- 1.334
rC=C C5H8 Ethenylcyclopropane 1.334
rC=C C2H3NO Nitrosoethylene 1.335
rC=C C4F6 perfluorobutadiene 1.336
rC=C C4H5N (E)-2-Butenenitrile 1.336 !assumed
rC=C C5H6 1-Buten-3-yne, 2-methyl- 1.336 !assumed
rC=C C7H8 Norbornadiene 1.336
rC=C C3H6O 2-Propen-1-ol 1.337
rC=C CHClCCl2 Trichloroethylene 1.337
rC=C CH2CHOCHCH2 Vinyl ether 1.337 average
rC=C CH2CHCHCH2 1,3-Butadiene 1.337
rC=C CH2CHCHClCH3 1-Butene, 3-chloro- 1.337
rC=C C6H8 (Z)-hexa-1,3,5-triene 1.337 end =
rC=C C8H8 cyclooctatetraene 1.337 re
rC=C C5H10 2-Pentene, (Z)- 1.338
rC=C C6H8 Bicyclo[3.1.0]hex-2-ene 1.338
rC=C C5H8O 2H-Pyran, 3,4-dihydro- 1.338 !assumed
rC=C C3H3N acrylonitrile 1.339
rC=C CH2CHCHO Acrolein 1.339
rC=C C2H4 Ethylene 1.339
rC=C C6H6 Benzvalene 1.339
rC=C C5H8 1,4-Pentadiene 1.339
rC=C CH2CHCH2CH2Cl 1-Butene, 4-chloro- 1.339
rC=C C4H6S Thiophene, 2,5-dihydro- 1.340
rC=C C5H6 1,3-Cyclopentadiene 1.340
rC=C C4H4N2O2 Uracil 1.340
rC=C CH2CF2 Ethene, 1,1-difluoro- 1.340
rC=C C5H8 1,3-Butadiene, 2-methyl- 1.340
rC=C C6H10 cyclohexene 1.340
rC=C CH2CHCHO Acrolein 1.341
rC=C C2HF3 Trifluoroethylene 1.341
rC=C C5H4O2 4-Cyclopentene-1,3-dione 1.341
rC=C C4H6 Cyclobutene 1.342
rC=C CH2ClCHCHCH3 2-Butene, 1-chloro- 1.342
rC=C CH2CHCH2CH3 1-Butene 1.342
rC=C CH2CClCHCH2 1,3-Butadiene, 2-chloro- 1.344
rC=C CH2CClCHCH2 1,3-Butadiene, 2-chloro- 1.344
rC=C C2H3CCH 1-Buten-3-yne 1.344
rC=C CF2CCl2 difluorodichloroethylene 1.345
rC=C CHOCHCHCH3 2-Butenal 1.345 !assumed
rC=C C10H10 bullvalene 1.346
rC=C CH3CHCHCH3 2-Butene, (Z)- 1.346
rC=C C6H8 1,4-Cyclohexadiene 1.347
rC=C CH3CHCHCH3 2-Butene, (E)- 1.347
rC=C C4H6O Furan, 2,5-dihydro- 1.347
rC=C C6H6 Fulvene 1.349 out of ring
rC=C C6H8 1,3-Cyclohexadiene 1.349
rC=C C6H12 (E)-3-methylpent-2-ene 1.349
rC=C C5H8 Cyclopentene 1.350 !assumed
rC=C CH2CHCH2F Allyl Fluoride 1.350
rC=C C3H3NO Oxazole 1.353
rC=C C6H12 2,3-dimethyl-but-2-ene 1.353
rC=C CH2CHCH3 Propene 1.353
rC=C C2Cl4 Tetrachloroethylene 1.354
rC=C CHClCHCl Ethene, 1,2-dichloro-, (E)- 1.354
rC=C C6H6 Fulvene 1.355 in ring
rC=C C3H3NO Isoxazole 1.356
rC=C C4H4O Furan 1.361
rC=C C4H5NO Isoxazole, 5-methyl- 1.362 !assumed
rC=C C4H5NO 3-Methylisoxazole 1.362 !assumed
rC=C C3H4N2 1H-Imidazole 1.364
rC=C C6H8 (Z)-hexa-1,3,5-triene 1.368 center =
rC=C C4H4Se selenophene 1.370
rC=C C4H4S Thiophene 1.370
rC=C C5H6S Thiophene, 3-methyl- 1.370 !assumed
rC=C C3H4N2 1H-Pyrazole 1.374
rC=C C4H5N Pyrrole 1.382
 
Average 1.334 ±0.024
Min 1.243
Max 1.382