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Experimental data for C2H5N (Aziridine)

22 02 02 11 45
Other names
1H-Azirine, dihydro-; Aethylenimin; Aminoethylene; Azacyclopropane; Aziran; Azirane; Aziridin; Aziridine; Dihydro-1H-azirine; Dihydroazirene; Dimethyleneimine; Dimethylenimine; EI; ENT-50324; Ethirydine; Ethyleenimine; Ethylene imine, inhibited; Ethyleneimine; Ethylenimine; Ethylimine; Etilenimina; TL 337;
INChI INChIKey SMILES IUPAC name
InChI=1S/C2H5N/c1-2-3-1/h3H,1-2H2 NOWKCMXCCJGMRR-UHFFFAOYSA-N N1CC1 Aziridine
State Conformation
1A' C1
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 126.00   kJ mol-1 TRC
Hfg(0K) enthalpy of formation 142.50   kJ mol-1 TRC
Entropy (298.15K) entropy 250.23   J K-1 mol-1 TRC
Integrated Heat Capacity (0 to 298.15K) integrated heat capacity 11.08   kJ mol-1 TRC
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' 3338   Shim      
2 A' 3079   Shim      
3 A' 3015   Shim      
4 A' 1482   Shim      
5 A' 1237   Shim       moved to 6 (was 1211)
6 A' 1211   Shim       moved to 16 (was 1095)
7 A' 1090   Shim      
8 A' 998   Shim      
9 A' 856   Shim      
10 A' 773   Shim      
11 A" 3079   Shim      
12 A" 3015   Shim      
13 A" 1463   Shim      
14 A" 1268   Shim      
15 A" 1131   Shim       moved to 5 (was 1237)
16 A" 1095   Shim       moved to 15 (was 1131)
17 A" 904   Shim      
18 A" 817   Shim      

vibrational zero-point energy: 14925.5 cm-1 (from fundamental vibrations)
Calculated vibrational frequencies for C2H5N (Aziridine).
Rotational Constants (cm-1) rotational constants
See section I.F.4 to change rotational constant units
A B C reference comment
0.75840 0.70690 0.44641 1971Bak/Ska:385

Calculated rotational constants for C2H5N (Aziridine).
Product of moments of inertia moments of inertia
20017.04amu3Å6   9.16574613900937E-116gm3 cm6
Geometric Data
picture of Aziridine

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
rNH 1.016   1 2 1998Kuc
rCN 1.475   1 3 1998Kuc
rCC 1.481   3 4 1998Kuc
rCH 1.084   3 6 1998Kuc on H side
rCH 1.083   3 5 1998Kuc on side away from NH
aCNC 60.25 3 1 4 1998Kuc
aHNC 109.31 2 1 3 1998Kuc
aHCH 115.72 5 3 6 1998Kuc
aHCC 117.75 4 3 6 1998Kuc H on NH side
aHCN 118.26 1 3 6 1998Kuc H on NH side
aHCC 119.32 4 3 5 1998Kuc H away from NH side
aHCN 114.27 1 3 5 1998Kuc H away from NH side

Cartesians
Atom x (Å) y (Å) z (Å)
N1 -0.0037 0.8559 -0.1934
H2 -0.0140 1.4040 0.6620
C3 -0.7380 -0.4043 0.0261
C4 0.7425 -0.3952 0.0380
H5 -1.2757 -0.4486 0.9652
H6 -1.2332 -0.8641 -0.8216
H7 1.2820 -0.7584 -0.8280
H8 1.2404 -0.5270 0.9918

Atom - Atom Distances bond lengths
Distances in Å
  N1 H2 C3 C4 H5 H6 H7 H8
N1   1.01601.47501.47502.15912.20562.15912.2056
H2 1.0160   2.04912.04912.26192.97192.92842.3262
C3 1.47502.0491   1.48061.08301.08402.22162.2049
C4 1.47502.04911.4806   2.22162.20491.08301.0840
H5 2.15912.26191.08302.2216   1.83493.13902.5174
H6 2.20562.97191.08402.20491.8349   2.51743.0855
H7 2.15912.92842.22161.08303.13902.5174   1.8349
H8 2.20562.32622.20491.08402.51743.08551.8349  

Calculated geometries for C2H5N (Aziridine).

Experimental Bond Angles (degrees) from cartesians bond angles

atom1 atom2 atom3 angle         atom1 atom2 atom3 angle
N1 C3 C4 59.875 N1 C3 H5 114.270
N1 C3 H6 118.260 N1 C4 C3 59.875
N1 C4 H7 114.270 N1 C4 H8 118.260
H2 N1 C3 109.310 H2 N1 C4 109.310
C3 N1 C4 60.250 C3 C4 H7 119.320
C3 C4 H8 117.750 C4 C3 H5 119.320
C4 C3 H6 117.750 H5 C3 H6 115.721
H7 C4 H8 115.721

Bond descriptions


Examples: C-C single bond, C=C, double bond, C#C triple bond, C:C aromatic bond
Bond Type Count
H-C 4
H-N 1
C-C 1
C-N 2

Connectivity
Atom 1 Atom 2
N1 H2
N1 C3
N1 C4
C3 C4
C3 H5
C3 H6
C4 H7
C4 H8
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
9.200 0.100 9.850   webbook

Proton Affinity (kJ mol-1)
Proton Affinity unc. Product reference comment
905.5   C2H5NH+ 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' C1 True 0.000 1.670 0.890 1.890 1953Joh/Mye:1425 y=b, z=c +-0.01D 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 C2H5N (Aziridine).
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' C1 True 1.300 -2.600 1.300 1971Fly/Ben:225 Qxx=-2.6+-0.6, Qyy=1.3+-0.6, Qzz=1.3+-0.6 Cs 2 3

Calculated electric quadrupole moments for C2H5N (Aziridine).

References
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squib reference DOI
1953Joh/Mye:1425 RD Johnson, RJ Myers, WD Gwinn "Microwave Spectrum and Dipole Moment of Ethylenimine" J. Chem. Phys. 21, 1425 (1953) 10.1063/1.1699266
1971Bak/Ska:385 B Bak, S Skaarup, "The substitution structure of ethyleneimine" J. Mol. Struct. 10 (1971) 385-391 10.1016/0022-2860(71)85060-3
1971Fly/Ben:225 WH Flygare, RC Benson "The molecular Zeeman effect in diamagnetic molecules and the determination of molecular magnetic moments (g values), magnetic susceptibilities, and molecular quadrupole moments" Mol. Phys. 1971, 20 (2), 225-250 10.1080/00268977100100221
1998Kuc K Kuchitsu(ed) "Structure of Free Polyatomic Molecules - Basic Data" Springer, Berlin, 1998 10.1007/978-3-642-45748-7 
Shim Shimanouchi, T. , Tables of Molecular Vibrational Frequencies, Consolidated Volu 10.6028/NBS.NSRDS.39
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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