Selected ATcT [1, 2] enthalpy of formation based on version 1.202 of the Thermochemical Network [3]This version of ATcT results[3] was generated by additional expansion of version 1.176 in order to include species related to the thermochemistry of glycine[4].
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1-Ethynyl-2-propyn-1-ylidene |
| Formula: HCCCCCH (g, triplet) |
| CAS RN: 882068-94-2 |
| ATcT ID: 882068-94-2*1 |
| SMILES: C#C[C]C#C |
| InChI: InChI=1S/C5H2/c1-3-5-4-2/h1-2H |
| InChIKey: ONLBGIDTQSBRIM-UHFFFAOYSA-N |
| Hills Formula: C5H2 |
2D Image: |
![C#C[C]C#C](../images/855.png) |
| Aliases: HCCCCCH; 1-Ethynyl-2-propyn-1-ylidene; 117992-78-6; 2,4-Pentadiynylidene; Penta-1,2-dien-4-yn-1-ylium-3-ide; 2,4-Pentadiyn-1-ylidene; 1800066-01-6; 1,2,3,4-Pentatetraene-1,5-diyl |
| Relative Molecular Mass: 62.0694 ± 0.0040 |
| ΔfH°(0 K) | ΔfH°(298.15 K) | Uncertainty | Units |
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| 727.1 | 734.1 | ± 1.7 | kJ/mol |
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3D Image of HCCCCCH (g, triplet) |
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| spin ON spin OFF |
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Top contributors to the provenance of ΔfH° of HCCCCCH (g, triplet)The 6 contributors listed below account for 92.1% of the provenance of ΔfH° of HCCCCCH (g, triplet).
Please note: The list is limited to 20 most important contributors or, if less, a number sufficient to account for 90% of the provenance. The Reference acts as a further link to the relevant references and notes for the measurement. The Measured Quantity is normaly given in the original units; in cases where we have reinterpreted the original measurement, the listed value may differ from that given by the authors. The quoted uncertainty is the a priori uncertainty used as input when constructing the initial Thermochemical Network, and corresponds either to the value proposed by the original authors or to our estimate; if an additional multiplier is given in parentheses immediately after the prior uncertainty, it corresponds to the factor by which the prior uncertainty needed to be multiplied during the ATcT analysis in order to make that particular measurement consistent with the prevailing knowledge contained in the Thermochemical Network.
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Contribution
(%) | TN
ID | Reaction | Measured Quantity | Reference | | 64.5 | 9193.1 | 5 CH4 (g) → HCCCCCH (g, triplet) + 9 H2 (g) | ΔrH°(0 K) = 1059.82 ± 2.00 kJ/mol | Klippenstein 2017 | | 9.6 | 9194.2 | HCCCCCH (g, triplet) + CH2 (g, triplet) → 2 HCCCH (g, triplet) | ΔrH°(0 K) = -7.19 ± 1.0 kcal/mol | Ruscic G4 | | 7.9 | 9194.1 | HCCCCCH (g, triplet) + CH2 (g, triplet) → 2 HCCCH (g, triplet) | ΔrH°(0 K) = -6.84 ± 1.1 kcal/mol | Ruscic G3X | | 3.8 | 9194.4 | HCCCCCH (g, triplet) + CH2 (g, triplet) → 2 HCCCH (g, triplet) | ΔrH°(0 K) = -5.79 ± 1.0 (×1.576) kcal/mol | Ruscic CBS-n | | 3.8 | 9194.3 | HCCCCCH (g, triplet) + CH2 (g, triplet) → 2 HCCCH (g, triplet) | ΔrH°(0 K) = -8.89 ± 1.3 (×1.215) kcal/mol | Ruscic CBS-n | | 2.1 | 9194.5 | HCCCCCH (g, triplet) + CH2 (g, triplet) → 2 HCCCH (g, triplet) | ΔrH°(0 K) = -9.42 ± 0.9 (×2.327) kcal/mol | Ruscic W1RO | | 64.5 | 9193.1 | 5 CH4 (g) → HCCCCCH (g, triplet) + 9 H2 (g) | ΔrH°(0 K) = 1059.82 ± 2.00 kJ/mol | Klippenstein 2017 | | 9.6 | 9194.2 | HCCCCCH (g, triplet) + CH2 (g, triplet) → 2 HCCCH (g, triplet) | ΔrH°(0 K) = -7.19 ± 1.0 kcal/mol | Ruscic G4 | | 7.9 | 9194.1 | HCCCCCH (g, triplet) + CH2 (g, triplet) → 2 HCCCH (g, triplet) | ΔrH°(0 K) = -6.84 ± 1.1 kcal/mol | Ruscic G3X | | 3.8 | 9194.4 | HCCCCCH (g, triplet) + CH2 (g, triplet) → 2 HCCCH (g, triplet) | ΔrH°(0 K) = -5.79 ± 1.0 (×1.576) kcal/mol | Ruscic CBS-n | | 3.8 | 9194.3 | HCCCCCH (g, triplet) + CH2 (g, triplet) → 2 HCCCH (g, triplet) | ΔrH°(0 K) = -8.89 ± 1.3 (×1.215) kcal/mol | Ruscic CBS-n | | 2.1 | 9194.5 | HCCCCCH (g, triplet) + CH2 (g, triplet) → 2 HCCCH (g, triplet) | ΔrH°(0 K) = -9.42 ± 0.9 (×2.327) kcal/mol | Ruscic W1RO |
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Top 10 species with enthalpies of formation correlated to the ΔfH° of HCCCCCH (g, triplet) |
Please note: The correlation coefficients are obtained by renormalizing the off-diagonal elements of the covariance matrix by the corresponding variances.
The correlation coefficient is a number from -1 to 1, with 1 representing perfectly correlated species, -1 representing perfectly anti-correlated species, and 0 representing perfectly uncorrelated species.
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Correlation
Coefficent
(%) | Species Name | Formula | Image | ΔfH°(0 K) | ΔfH°(298.15 K) | Uncertainty | Units | Relative
Molecular
Mass | ATcT ID | | 100.0 | 1-Ethynyl-2-propyn-1-ylidene | HCCCCCH (g) | ![C#C[C]C#C](../images/3025.png) | 727.1 | 734.1 | ± 1.7 | kJ/mol | 62.0694 ±
0.0040 | 882068-94-2*0 | | 100.0 | 1-Ethynyl-2-propyn-1-ylidene | HCCCCCH (g) | | 727.1 | 734.1 | ± 1.7 | kJ/mol | 62.0694 ±
0.0040 | 882068-94-2*0 | | 80.4 | 1-Ethynyl-2-propyn-1-ylidene | HCCCCCH (g, singlet) | ![C#C[C]C#C](../images/3026.png) | 787.5 | 793.0 | ± 2.1 | kJ/mol | 62.0694 ±
0.0040 | 882068-94-2*2 | | 80.4 | 1-Ethynyl-2-propyn-1-ylidene | HCCCCCH (g, singlet) | | 787.5 | 793.0 | ± 2.1 | kJ/mol | 62.0694 ±
0.0040 | 882068-94-2*2 | | 80.4 | 1-Ethynyl-2-propyn-1-ylidene | HCCCCCH (g, singlet C2v) | ![C#C[C]C#C](../images/1956.png) | 787.5 | 792.5 | ± 2.1 | kJ/mol | 62.0694 ±
0.0040 | 882068-94-2*21 | | 80.4 | 1-Ethynyl-2-propyn-1-ylidene | HCCCCCH (g, singlet C2v) | | 787.5 | 792.5 | ± 2.1 | kJ/mol | 62.0694 ±
0.0040 | 882068-94-2*21 | | 79.2 | 1,3-Pentadiyne-1.5-diyl | CH2CCCC (g) | ![[CH2+]C#CC#[C-]](../images/1958.png) | 783.8 | 787.4 | ± 2.1 | kJ/mol | 62.0694 ±
0.0040 | 117992-81-1*0 | | 79.2 | 1,3-Pentadiyne-1.5-diyl | CH2CCCC (g) | | 783.8 | 787.4 | ± 2.1 | kJ/mol | 62.0694 ±
0.0040 | 117992-81-1*0 | | 68.7 | 1,2-Pentadien-4-ynylidene | HCCCHCC (g) | ![C#CC=C=[C]](../images/3031.png) | 791.3 | 794.1 | ± 2.4 | kJ/mol | 62.0694 ±
0.0040 | 195524-67-5*0 | | 68.7 | 1,2-Pentadien-4-ynylidene | HCCCHCC (g) | | 791.3 | 794.1 | ± 2.4 | kJ/mol | 62.0694 ±
0.0040 | 195524-67-5*0 | | 65.0 | 1-Ethynyl-2-propyn-1-ylium-1-yl | [HCCCCCH]+ (g) | ![C#C[C+]C#C](../images/3023.png) | 1537.2 | 1540.9 | ± 2.6 | kJ/mol | 62.0688 ±
0.0040 | 217822-76-9*0 | | 65.0 | 1-Ethynyl-2-propyn-1-ylium-1-yl | [HCCCCCH]+ (g) | | 1537.2 | 1540.9 | ± 2.6 | kJ/mol | 62.0688 ±
0.0040 | 217822-76-9*0 | | 64.9 | 1-Ethynyl-2-propyn-1-ylidene | HCCCCCH (g, singlet Cs) | ![C#C[C]C#C](../images/1957.png) | 796.1 | 801.0 | ± 2.6 | kJ/mol | 62.0694 ±
0.0040 | 882068-94-2*22 | | 64.9 | 1-Ethynyl-2-propyn-1-ylidene | HCCCCCH (g, singlet Cs) | | 796.1 | 801.0 | ± 2.6 | kJ/mol | 62.0694 ±
0.0040 | 882068-94-2*22 | | 52.1 | 2-Ethynyl-2-cyclopropen-1-ylidene | HCCC(CCH) (g) | ![C#CC1=C[C]1](../images/2214.png) | 726.2 | 727.4 | ± 3.2 | kJ/mol | 62.0694 ±
0.0040 | 117992-84-4*0 | | 52.1 | 2-Ethynyl-2-cyclopropen-1-ylidene | HCCC(CCH) (g) | | 726.2 | 727.4 | ± 3.2 | kJ/mol | 62.0694 ±
0.0040 | 117992-84-4*0 | | 48.8 | 2-Cyclopropen-1-ylideneethenylidene | CCC(CHCH) (g) | ![[C]=C=C1C=C1](../images/3032.png) | 807.2 | 808.8 | ± 3.4 | kJ/mol | 62.0694 ±
0.0040 | 195524-69-7*0 | | 48.8 | 2-Cyclopropen-1-ylideneethenylidene | CCC(CHCH) (g) | | 807.2 | 808.8 | ± 3.4 | kJ/mol | 62.0694 ±
0.0040 | 195524-69-7*0 | | 47.0 | 1-Ethynyl-2-propyn-1-ylidene anion | [HCCCCCH]- (g) | ![C#C[C-]C#C](../images/3024.png) | 584.3 | 589.3 | ± 3.5 | kJ/mol | 62.0699 ±
0.0040 | 217822-70-3*0 | | 47.0 | 1-Ethynyl-2-propyn-1-ylidene anion | [HCCCCCH]- (g) | | 584.3 | 589.3 | ± 3.5 | kJ/mol | 62.0699 ±
0.0040 | 217822-70-3*0 |
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Most Influential reactions involving HCCCCCH (g, triplet)Please note: The list, which is based on a hat (projection) matrix analysis, is limited to no more than 20 largest influences.
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Influence
Coefficient | TN
ID | Reaction | Measured Quantity | Reference | | 1.000 | 9195.1 | HCCCCCH (g) → HCCCCCH (g, triplet) | ΔrH°(0 K) = 0 ± 0 cm-1 | Ruscic W1RO, Ruscic G4, Ruscic CBS-n | | 0.732 | 9205.9 | CH2CCCC (g) → HCCCCCH (g, triplet) | ΔrH°(0 K) = -13.53 ± 0.35 kcal/mol | Thimmakondu 2019 | | 0.674 | 9197.7 | HCCCCCH (g, triplet) → HCCCCCH (g, singlet C2v) | ΔrH°(0 K) = 14.12 ± 0.35 kcal/mol | Thimmakondu 2019 | | 0.657 | 9193.1 | 5 CH4 (g) → HCCCCCH (g, triplet) + 9 H2 (g) | ΔrH°(0 K) = 1059.82 ± 2.00 kJ/mol | Klippenstein 2017 | | 0.400 | 9190.5 | [HCCCCCH]- (g) → HCCCCCH (g, triplet) | ΔrH°(0 K) = 1.460 ± 0.050 eV | Ruscic W1RO | | 0.280 | 9187.1 | HCCCCCH (g, triplet) → [HCCCCCH]+ (g) | ΔrH°(0 K) = 8.36 ± 0.03 (×1.242) eV | Reusch 2019 | | 0.269 | 9190.2 | [HCCCCCH]- (g) → HCCCCCH (g, triplet) | ΔrH°(0 K) = 1.537 ± 0.061 eV | Ruscic G4 | | 0.243 | 9187.6 | HCCCCCH (g, triplet) → [HCCCCCH]+ (g) | ΔrH°(0 K) = 8.414 ± 0.040 eV | Ruscic W1RO | | 0.243 | 9187.7 | HCCCCCH (g, triplet) → [HCCCCCH]+ (g) | ΔrH°(0 K) = 8.417 ± 0.040 eV | Lam 2021, est unc | | 0.166 | 9194.2 | HCCCCCH (g, triplet) + CH2 (g, triplet) → 2 HCCCH (g, triplet) | ΔrH°(0 K) = -7.19 ± 1.0 kcal/mol | Ruscic G4 | | 0.140 | 9205.8 | CH2CCCC (g) → HCCCCCH (g, triplet) | ΔrH°(0 K) = -14.24 ± 0.80 kcal/mol | Thimmakondu 2019 | | 0.138 | 9190.1 | [HCCCCCH]- (g) → HCCCCCH (g, triplet) | ΔrH°(0 K) = 1.489 ± 0.085 eV | Ruscic G3X | | 0.137 | 9194.1 | HCCCCCH (g, triplet) + CH2 (g, triplet) → 2 HCCCH (g, triplet) | ΔrH°(0 K) = -6.84 ± 1.1 kcal/mol | Ruscic G3X | | 0.129 | 9197.6 | HCCCCCH (g, triplet) → HCCCCCH (g, singlet C2v) | ΔrH°(0 K) = 14.94 ± 0.80 kcal/mol | Thimmakondu 2019 | | 0.118 | 9190.3 | [HCCCCCH]- (g) → HCCCCCH (g, triplet) | ΔrH°(0 K) = 1.466 ± 0.092 eV | Ruscic CBS-n | | 0.073 | 9187.3 | HCCCCCH (g, triplet) → [HCCCCCH]+ (g) | ΔrH°(0 K) = 8.392 ± 0.073 eV | Ruscic G4 | | 0.069 | 9187.5 | HCCCCCH (g, triplet) → [HCCCCCH]+ (g) | ΔrH°(0 K) = 8.415 ± 0.075 eV | Ruscic CBS-n | | 0.066 | 9194.4 | HCCCCCH (g, triplet) + CH2 (g, triplet) → 2 HCCCH (g, triplet) | ΔrH°(0 K) = -5.79 ± 1.0 (×1.576) kcal/mol | Ruscic CBS-n | | 0.066 | 9194.3 | HCCCCCH (g, triplet) + CH2 (g, triplet) → 2 HCCCH (g, triplet) | ΔrH°(0 K) = -8.89 ± 1.3 (×1.215) kcal/mol | Ruscic CBS-n | | 0.059 | 9190.4 | [HCCCCCH]- (g) → HCCCCCH (g, triplet) | ΔrH°(0 K) = 1.350 ± 0.090 (×1.445) eV | Ruscic CBS-n | | 1.000 | 9195.1 | HCCCCCH (g) → HCCCCCH (g, triplet) | ΔrH°(0 K) = 0 ± 0 cm-1 | Ruscic W1RO, Ruscic G4, Ruscic CBS-n | | 0.732 | 9205.9 | CH2CCCC (g) → HCCCCCH (g, triplet) | ΔrH°(0 K) = -13.53 ± 0.35 kcal/mol | Thimmakondu 2019 | | 0.674 | 9197.7 | HCCCCCH (g, triplet) → HCCCCCH (g, singlet C2v) | ΔrH°(0 K) = 14.12 ± 0.35 kcal/mol | Thimmakondu 2019 | | 0.657 | 9193.1 | 5 CH4 (g) → HCCCCCH (g, triplet) + 9 H2 (g) | ΔrH°(0 K) = 1059.82 ± 2.00 kJ/mol | Klippenstein 2017 | | 0.400 | 9190.5 | [HCCCCCH]- (g) → HCCCCCH (g, triplet) | ΔrH°(0 K) = 1.460 ± 0.050 eV | Ruscic W1RO | | 0.280 | 9187.1 | HCCCCCH (g, triplet) → [HCCCCCH]+ (g) | ΔrH°(0 K) = 8.36 ± 0.03 (×1.242) eV | Reusch 2019 | | 0.269 | 9190.2 | [HCCCCCH]- (g) → HCCCCCH (g, triplet) | ΔrH°(0 K) = 1.537 ± 0.061 eV | Ruscic G4 | | 0.243 | 9187.6 | HCCCCCH (g, triplet) → [HCCCCCH]+ (g) | ΔrH°(0 K) = 8.414 ± 0.040 eV | Ruscic W1RO | | 0.243 | 9187.7 | HCCCCCH (g, triplet) → [HCCCCCH]+ (g) | ΔrH°(0 K) = 8.417 ± 0.040 eV | Lam 2021, est unc | | 0.166 | 9194.2 | HCCCCCH (g, triplet) + CH2 (g, triplet) → 2 HCCCH (g, triplet) | ΔrH°(0 K) = -7.19 ± 1.0 kcal/mol | Ruscic G4 | | 0.140 | 9205.8 | CH2CCCC (g) → HCCCCCH (g, triplet) | ΔrH°(0 K) = -14.24 ± 0.80 kcal/mol | Thimmakondu 2019 | | 0.138 | 9190.1 | [HCCCCCH]- (g) → HCCCCCH (g, triplet) | ΔrH°(0 K) = 1.489 ± 0.085 eV | Ruscic G3X | | 0.137 | 9194.1 | HCCCCCH (g, triplet) + CH2 (g, triplet) → 2 HCCCH (g, triplet) | ΔrH°(0 K) = -6.84 ± 1.1 kcal/mol | Ruscic G3X | | 0.129 | 9197.6 | HCCCCCH (g, triplet) → HCCCCCH (g, singlet C2v) | ΔrH°(0 K) = 14.94 ± 0.80 kcal/mol | Thimmakondu 2019 | | 0.118 | 9190.3 | [HCCCCCH]- (g) → HCCCCCH (g, triplet) | ΔrH°(0 K) = 1.466 ± 0.092 eV | Ruscic CBS-n | | 0.073 | 9187.3 | HCCCCCH (g, triplet) → [HCCCCCH]+ (g) | ΔrH°(0 K) = 8.392 ± 0.073 eV | Ruscic G4 | | 0.069 | 9187.5 | HCCCCCH (g, triplet) → [HCCCCCH]+ (g) | ΔrH°(0 K) = 8.415 ± 0.075 eV | Ruscic CBS-n | | 0.066 | 9194.4 | HCCCCCH (g, triplet) + CH2 (g, triplet) → 2 HCCCH (g, triplet) | ΔrH°(0 K) = -5.79 ± 1.0 (×1.576) kcal/mol | Ruscic CBS-n | | 0.066 | 9194.3 | HCCCCCH (g, triplet) + CH2 (g, triplet) → 2 HCCCH (g, triplet) | ΔrH°(0 K) = -8.89 ± 1.3 (×1.215) kcal/mol | Ruscic CBS-n | | 0.059 | 9190.4 | [HCCCCCH]- (g) → HCCCCCH (g, triplet) | ΔrH°(0 K) = 1.350 ± 0.090 (×1.445) eV | Ruscic CBS-n |
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References
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1
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B. Ruscic, R. E. Pinzon, M. L. Morton, G. von Laszewski, S. Bittner, S. G. Nijsure, K. A. Amin, M. Minkoff, and A. F. Wagner,
Introduction to Active Thermochemical Tables: Several "Key" Enthalpies of Formation Revisited.
J. Phys. Chem. A 108, 9979-9997 (2004)
[DOI: 10.1021/jp047912y]
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2
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B. Ruscic, R. E. Pinzon, G. von Laszewski, D. Kodeboyina, A. Burcat, D. Leahy, D. Montoya, and A. F. Wagner,
Active Thermochemical Tables: Thermochemistry for the 21st Century.
J. Phys. Conf. Ser. 16, 561-570 (2005)
[DOI: 10.1088/1742-6596/16/1/078]
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3
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B. Ruscic and D. H. Bross,
Active Thermochemical Tables (ATcT) values based on ver. 1.202 of the Thermochemical Network (2024); available at ATcT.anl.gov |
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4
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B. Ruscic and D. H. Bross
Accurate and Reliable Thermochemistry by Data Analysis of Complex Thermochemical Networks using Active Thermochemical Tables: The Case of Glycine Thermochemistry
Faraday Discuss. (in press) (2024)
[DOI: 10.1039/D4FD00110A]
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5
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B. Ruscic,
Uncertainty Quantification in Thermochemistry, Benchmarking Electronic Structure Computations, and Active Thermochemical Tables.
Int. J. Quantum Chem. 114, 1097-1101 (2014)
[DOI: 10.1002/qua.24605]
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6
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B. Ruscic and D. H. Bross,
Thermochemistry
Computer Aided Chem. Eng. 45, 3-114 (2019)
[DOI: 10.1016/B978-0-444-64087-1.00001-2]
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Formula
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The aggregate state is given in parentheses following the formula, such as: g - gas-phase, cr - crystal, l - liquid, etc.
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Uncertainties
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The listed uncertainties correspond to estimated 95% confidence limits, as customary in thermochemistry (see, for example, Ruscic [5] and Ruscic and Bross[6]).
Note that an uncertainty of ± 0.000 kJ/mol indicates that the estimated uncertainty is < ± 0.0005 kJ/mol.
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Website Functionality Credits
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The reorganization of the website was developed and implemented by David H. Bross (ANL).
The find function is based on the complete Species Dictionary entries for the appropriate version of the ATcT TN.
The molecule images are rendered by Indigo-depict.
The XYZ renderings are based on Jmol: an open-source Java viewer for chemical structures in 3D. http://www.jmol.org/.
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Acknowledgement
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This work was supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, Division of Chemical Sciences, Geosciences and Biosciences under Contract No. DE-AC02-06CH11357.
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