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Experimental data for CH(CN)3 (tricyanomethane)

22 02 02 11 45
Other names
Cyanoform; Methanetricarbonitrile;
INChI INChIKey SMILES IUPAC name
nChI=1S/C4HN3/c5-1-4(2-6)3-7/h4H HFWIMJHBCIGYFH-UHFFFAOYSA-N C(#N)C(C#N)C#N Methanetricarbonitrile
State Conformation
1A1 C3V
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 2928   2017Ban/Chi:9582– 9586      
2 A1 2288          
3 A1 823          
4 A1 571          
5 A1 164          
6 A2 349          
7 E 2268          
8 E 1268          
9 E 1023          
10 E 556          
11 E 349          
12 E 149          

vibrational zero-point energy: 9174.9 cm-1 (from fundamental vibrations)
Calculated vibrational frequencies for CH(CN)3 (tricyanomethane).
Rotational Constants (cm-1) rotational constants
See section I.F.4 to change rotational constant units
A B C reference comment
  0.09557   1977Bak/Sva:153-156

Calculated rotational constants for CH(CN)3 (tricyanomethane).
Product of moments of inertia moments of inertia
amu3Å6   0gm3 cm6
Geometric Data
picture of tricyanomethane

Point Group C3v


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
rCN 1.158   3 6 1977Bak/Sva:153-156
rCC 1.460   1 3 1977Bak/Sva:153-156
rCH 1.100   1 2 1977Bak/Sva:153-156
aHCC 106.59 2 1 3 1977Bak/Sva:153-156
aCCN 177 1 3 6 1977Bak/Sva:153-156

Cartesians
Atom x (Å) y (Å) z (Å)
C1 0.0000 0.0000 0.4537
H2 0.0000 0.0000 1.5537
C3 0.0000 1.3992 0.0369
C4 1.2118 -0.6996 0.0369
C5 -1.2118 -0.6996 0.0369
N6 0.0000 2.5248 -0.2352
N7 2.1865 -1.2624 -0.2352
N8 -2.1865 -1.2624 -0.2352

Atom - Atom Distances bond lengths
Distances in Å
  C1 H2 C3 C4 C5 N6 N7 N8
C1   1.10001.46001.46001.46002.61712.61712.6171
H2 1.1000   2.06372.06372.06373.09433.09433.0943
C3 1.46002.0637   2.42352.42351.15803.45533.4553
C4 1.46002.06372.4235   2.42353.45531.15803.4553
C5 1.46002.06372.42352.4235   3.45533.45531.1580
N6 2.61713.09431.15803.45533.4553   4.37314.3731
N7 2.61713.09433.45531.15803.45534.3731   4.3731
N8 2.61713.09433.45533.45531.15804.37314.3731  

Calculated geometries for CH(CN)3 (tricyanomethane).

Experimental Bond Angles (degrees) from cartesians bond angles

atom1 atom2 atom3 angle         atom1 atom2 atom3 angle
C1 C3 N6 177.000 C1 C4 N7 177.000
C1 C5 N8 177.000 H2 C1 C3 106.590
H2 C1 C4 106.590 H2 C1 C5 106.590
C3 C1 C4 112.192 C3 C1 C5 112.192
C4 C1 C5 112.192

Bond descriptions


Examples: C-C single bond, C=C, double bond, C#C triple bond, C:C aromatic bond
Bond Type Count
H-C 1
C-C 3
C#N 3

Connectivity
Atom 1 Atom 2
C1 H2
C1 C3
C1 C4
C1 C5
C3 N6
C4 N7
C5 N8
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 C3v True           C3v 1 1
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 CH(CN)3 (tricyanomethane).
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 C3v True       C3v 1 1

Calculated electric quadrupole moments for CH(CN)3 (tricyanomethane).

References
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squib reference DOI
1977Bak/Sva:153-156 R Bak, H Svanholt "THE EXISTENCE OF GASEOUS CYANOFORM AS OBSERVED BY MICROWAVE SPECTRA" Journal of Molecular Structure. 37 (1977) 153-156 10.1016/0022-2860(77)87015-4
2017Ban/Chi:9582– 9586 K Banert, M Chityala, M Hagedorn, H Beckers, T Stuker, S Riedel, T Ruffer, H Lang "Tricyanomethane and Its Ketenimine Tautomer: Generation from Different Precursors and Analysis in Solution, Argon Matrix, and as a Single Crystal" Angew. Chem., Int. Ed. 2017, 56, 9582– 9586 10.1002/anie.201704561

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