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Experimental data for C2H2N2O (Furazan)

22 02 02 11 45
Other names
1,2,5-Oxadiazole; Azoxazole; 1-Oxa-2,5-diazacyclopentadiene;
INChI INChIKey SMILES IUPAC name
InChI=1S/C2H2N2O/c1-2-4-5-3-1/h1-2H JKFAIQOWCVVSKC-UHFFFAOYSA-N n1oncc1
State Conformation
1A1 C2V
Enthalpy of formation (Hfg), Entropy, Integrated heat capacity (0 K to 298.15 K) (HH), Heat Capacity (Cp)
Property Value Uncertainty units Reference Comment
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 A1 3157   2005Pfl/Pau:327-332      
2 A1 1418          
3 A1 1316          
4 A1 1036          
5 A1 1005          
6 A1 872          
7 A2 824          
8 A2 635          
9 B1 839           B1 B2 numbering changed
10 B1 631          
11 B2 3144           B1 B2 numbering changed
12 B2 1541          
13 B2 1176          
14 B2 953          
15 B2 888          

vibrational zero-point energy: 9717.5 cm-1 (from fundamental vibrations)
Calculated vibrational frequencies for C2H2N2O (Furazan).
Rotational Constants (cm-1) rotational constants
See section I.F.4 to change rotational constant units
A B C reference comment
0.34881 0.32294 0.16757 1988Sti:597-606

Calculated rotational constants for C2H2N2O (Furazan).
Product of moments of inertia moments of inertia
253783.1amu3Å6   1.16206560880819E-114gm3 cm6
Geometric Data
picture of Furazan

Point Group C2v


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
rNO 1.373 0.001 1 2 1988Sti:597-606
rCN 1.303 0.001 2 4 1988Sti:597-606
rCC 1.421 0.001 4 5 1988Sti:597-606
rHC 1.076 0.001 4 6 1988Sti:597-606
aNON 111.15 0.08 2 1 3 1988Sti:597-606
aCNO 105.53 0.05 1 2 4 1988Sti:597-606
aCCN 108.89 0.03 2 4 5 1988Sti:597-606
aHCC 130.16 0.03 4 5 7 1988Sti:597-606

Cartesians
Atom x (Å) y (Å) z (Å)
O1 0.0000 0.0000 1.1289
N2 0.0000 1.1325 0.3527
N3 0.0000 -1.1325 0.3527
C4 0.0000 0.7104 -0.8803
C5 0.0000 -0.7104 -0.8803
H6 0.0000 1.4045 -1.7029
H7 0.0000 -1.4045 -1.7029

Atom - Atom Distances bond lengths
Distances in Å
  O1 N2 N3 C4 C5 H6 H7
O1   1.37291.37292.13102.13103.16093.1609
N2 1.3729   2.26491.30322.21732.07353.2652
N3 1.37292.2649   2.21731.30323.26522.0735
C4 2.13101.30322.2173   1.42091.07632.2693
C5 2.13102.21731.30321.4209   2.26931.0763
H6 3.16092.07353.26521.07632.2693   2.8090
H7 3.16093.26522.07352.26931.07632.8090  

Calculated geometries for C2H2N2O (Furazan).

Experimental Bond Angles (degrees) from cartesians bond angles

atom1 atom2 atom3 angle         atom1 atom2 atom3 angle
O1 N2 C4 105.530 O1 N3 C5 105.530
N2 O1 N3 111.150 N2 C4 C5 108.895
N2 C4 H6 120.950 N3 C5 C4 108.895
N3 C5 H7 120.950 C4 C5 H7 130.155
C5 C4 H6 130.155

Bond descriptions


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

Connectivity
Atom 1 Atom 2
O1 N2
O1 N3
N2 C4
N3 C5
C4 C5
C4 H6
C5 H7
Electronic energy levels (cm-1)
Energy (cm-1) Degeneracy reference description
0 1   1A1
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 1A1 C2v True       3.380 1988Sti:597-606 MW μ0 C2v 1 2
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 C2H2N2O (Furazan).
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 1A1 C2v True       C2v 1 2

Calculated electric quadrupole moments for C2H2N2O (Furazan).

References
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squib reference DOI
1988Sti:597-606 OL Stiefvater "Microwave Spectra of Furazan" Z. Naturforsch. 43a, 597-606 (1988)  
2005Pfl/Pau:327-332 K Pflüger, M Paulus, S Jagiella, T Burkert, G Rauhut "Multi-level vibrational SCF calculations and FTIR measurements on furazan" Theor Chem Acc (2005) 114: 327–332 10.1007/s00214-005-0678-4

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