CCCBDB Experimental bond lengths 3

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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	±1.340
Min			1.243
Max			1.382

	Computational Chemistry Comparison and Benchmark DataBase Release 22 (May 2022) Standard Reference Database 101 National Institute of Standards and Technology
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List of experimental bond lengths for bond type rC=C