Summary

IUPAC name2-methylbuta-1,3-diene
Synonyms78-79-5, InChI=1S/C5H8/c1-4-5(2)3/h4H,1-2H2,3H3, 2-methyl-1,3-butadiene, isoprene, 2-methyl-13-butadiene, 2-methyl-13-butadien
CAS number78-79-5
ChemSpider ID6309
PubChem ID6557
Molecular weight68.1167 Da
FormulaC5H8
Multiplicity1
Point groupCs
Symmetry number1
Rotatable bonds1
StdInChiInChI=1S/C5H8/c1-4-5(2)3/h4H,1-2H2,3H3


Liquid properties

PropertyUnitT (K)ExperimentGAFF-ESP-2012OPLSCGenFFCOSMO-RSkowwinGAFF-ESPXlogP3
ρg/l298.15675.01669.32
ΔHvapkJ/mol298.1526.17326.362
log kOW298.152.4242.505
2.426

Flexible models Hydrogen constrained All bonds constrained.


Gas properties

PropertyUnitT (K)ExperimentG2G3G4CBS-QB3W1BDW1UB3LYP/aug-cc-pVTZBSCGenFFGAFF-BCC-2018GAFF-ESP-2018AXppAXpgAXps
EkJ/mol298.15313.027300.688
E-scaledkJ/mol298.15310.268
ΔHformkJ/mol0103.4797.3797.17105.3790.1789.77
ΔHformkJ/mol298.1575.7381.4775.2775.8784.1768.8768.47
75.3±1.39
84.61
75.510
75.7±1.011
ΔGformkJ/mol298.15145.93154.37148.17147.77155.87140.67140.27
ΔSformJ/mol K298.150.03-244.67-244.67-241.17-240.47-240.87-240.87
S0J/mol K298.150.323306.807306.807310.377311.007310.597310.597378.578
314.961
S0-scaledJ/mol K298.15376.318
ZPEkJ/mol298.15297.77284.08
ZPE-scaledkJ/mol298.15293.98
CVJ/mol K298.1594.4±1.91281.7781.7788.2788.5788.2788.2792.18
CV-scaledJ/mol K298.1589.38
αanisoų298.151.83131.83131.8213


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