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Experimental data for CH3OC2H5 (Ethane, methoxy-)

22 02 02 11 45
Other names
Ethane, methoxy-; Ether, ethyl methyl; Ethyl methyl ether; Methane, ethoxy-; Methoxyethane; Methyl ethyl ether; ether;
INChI INChIKey SMILES IUPAC name
InChI=1S/C3H8O/c1-3-4-2/h3H2,1-2H3 XOBKSJJDNFUZPF-UHFFFAOYSA-N CCOC Methoxyethane
State Conformation
1A' CS
Enthalpy of formation (Hfg), Entropy, Integrated heat capacity (0 K to 298.15 K) (HH), Heat Capacity (Cp)
Property Value Uncertainty units Reference Comment
Hfg(298.15K) enthalpy of formation -216.50   kJ mol-1 TRC
Hfg(0K) enthalpy of formation -193.60   kJ mol-1 TRC
Entropy (298.15K) entropy 309.25   J K-1 mol-1 TRC
Integrated Heat Capacity (0 to 298.15K) integrated heat capacity 18.47   kJ mol-1 TRC
Heat Capacity (298.15K) heat capacity 93.30   J K-1 mol-1 webbook
Information can also be found for this species in the NIST Chemistry Webbook
Vibrational levels (cm-1) vibrations
Mode Number Symmetry Frequency Intensity Comment Description
Fundamental(cm-1) Harmonic(cm-1) Reference (km mol-1) unc. Reference
1 A' 2995   2002Dur/Jin:1      
2 A' 2968          
3 A' 2954          
4 A' 2835          
5 A' 2869          
6 A' 1492          
7 A' 1481          
8 A' 1473           from solid
9 A' 1448          
10 A' 1396          
11 A' 1368          
12 A' 1214          
13 A' 1135          
14 A' 1100          
15 A' 1020          
16 A' 858          
17 A' 475          
18 A' 288          
19 A" 2981          
20 A" 2935          
21 A" 2893          
22 A" 1464          
23 A" 1456          
24 A" 1277          
25 A" 1175          
26 A" 1148           from solid
27 A" 818           from solid
28 A" 278           from solid
29 A" 248          
30 A" 115          

vibrational zero-point energy: 23078.5 cm-1 (from fundamental vibrations)
Calculated vibrational frequencies for CH3OC2H5 (Ethane, methoxy-).
Rotational Constants (cm-1) rotational constants
See section I.F.4 to change rotational constant units
A B C reference comment
0.93378 0.13876 0.12979 2002Dur/Jin:1

Calculated rotational constants for CH3OC2H5 (Ethane, methoxy-).
Product of moments of inertia moments of inertia
284860.5amu3Å6   1.30436811031312E-114gm3 cm6
Geometric Data
picture of Ethane, methoxy-

Point Group Cs


Internal coordinates
distances (r) in Å, angles (a) in degrees, dihedrals (d) in degrees
Description Value unc. Connectivity Reference Comment
Atom 1 Atom 2 Atom 3 Atom 4
rCO 1.415 0.005 1 2 2002Dur/Jin:1 to methyl
rCO 1.407 0.004 2 3 2002Dur/Jin:1 ethyl
rCC 1.521 0.007 3 4 2002Dur/Jin:1
rCH 1.086 0.010 1 5 2002Dur/Jin:1 methyl in plane
rCH 1.099 0.007 1 6 2002Dur/Jin:1 methyl out of place
rCH 1.100 0.003 3 8 2002Dur/Jin:1 ethyl inner C
rCH 1.089 0.008 4 10 2002Dur/Jin:1 ethyl outer C in plane
rCH 1.092 0.007 4 11 2002Dur/Jin:1 ethyl outer C out of plane
aCOC 111.7 0.47 1 2 3 2002Dur/Jin:1
aCCO 108.15 0.38 2 3 4 2002Dur/Jin:1
aHCO 107.48 0.57 2 1 5 2002Dur/Jin:1 methyl in-plane
aHCO 111.05 0.5 2 1 6 2002Dur/Jin:1 methyl out-of-plane
aHCH 108.57 0.62 6 1 7 2002Dur/Jin:1 methyl out-of-plane
aHCO 110.32 0.47 2 3 8 2002Dur/Jin:1 ethyl inner H
aHCC 110.25 0.87 4 3 8 2002Dur/Jin:1
aHCH 107.4 0.28 8 3 9 2002Dur/Jin:1
aHCC 110.5 0.63 3 4 10 2002Dur/Jin:1 ethyl end C in-plane H
aHCC 110.13 0.57 3 4 11 2002Dur/Jin:1 ethyl end C out-of-plane H
aHCH 108.63 0.6 11 4 12 2002Dur/Jin:1 ethyl end C out-of-plane H
dCCOC 180 1 2 3 4 2002Dur/Jin:1
dHCOC 180 3 2 1 5 2002Dur/Jin:1
dHCCO 180 2 3 4 10 2002Dur/Jin:1

Cartesians
Atom x (Å) y (Å) z (Å)

Atom - Atom Distances bond lengths
Distances in Å
 

Calculated geometries for CH3OC2H5 (Ethane, methoxy-).

Bond descriptions


Examples: C-C single bond, C=C, double bond, C#C triple bond, C:C aromatic bond
Bond Type Count
H-C 8
C-C 1
C-O 2

Connectivity
Atom 1 Atom 2
C1 O2
C1 H5
C1 H6
C1 H7
O2 C3
C3 C4
C3 H8
C3 H9
C4 H10
C4 H11
C4 H12
Electronic energy levels (cm-1)
Energy (cm-1) Degeneracy reference description
0 1   1A'

Ionization Energies (eV)
Ionization Energy I.E. unc. vertical I.E. v.I.E. unc. reference
9.720 0.070 9.720   webbook
Dipole, Quadrupole and Polarizability
Electric dipole moment dipole
State Config State description Conf description Exp. min. Dipole (Debye) Reference comment Point Group Components
x y z total dipole quadrupole
1 1 1A' Cs True 0.146 1.165 0.000 1.174 2002Dur/Jin:1   Cs 2 3
Experimental dipole measurement abbreviations: MW microwave; DT Dielectric with Temperature variation; DR Indirect (usually an upper limit); MB Molecular beam
Calculated electric dipole moments for CH3OC2H5 (Ethane, methoxy-).
Electric quadrupole moment quadrupole
State Config State description Conf description Exp. min. Quadrupole (D Å) Reference comment Point Group Components
xx yy zz dipole quadrupole
1 1 1A' Cs True       Cs 2 3

Calculated electric quadrupole moments for CH3OC2H5 (Ethane, methoxy-).

References
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squib reference DOI
2002Dur/Jin:1 JR Durig, Y Jin, HV Phan, J Liu, DT Durig "Far-Infrared Spectra, Conformational Stability, Barriers to Internal Rotation, Ab Initio Calculations, r0 Structural Parameters, and Vibrational Assignment of Ethyl Methyl Ether" Structural Chemistry, 13(1) 2002, 1 10.1023/A:1013410428690
TRC Frenkel, M; Marsh, K.N.; Wilhoit, R.C.; Kabo, G.J.; Roganov, G.N.,Thermodynamics of Organic Compounds in the Gas State,Thermodynamics Research Center, College Station, TX, 1994  
webbook NIST Chemistry Webbook (http://webbook.nist.gov/chemistry) 10.18434/T4D303

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