return to home page Computational Chemistry Comparison and Benchmark DataBase Release 22 (May 2022) Standard Reference Database 101 National Institute of Standards and Technology
You are here: Experimental > One molecule all properties

Experimental data for HNCS (Isothiocyanic acid)

22 02 02 11 45
Other names
Hydrogen isothiocyanate;
INChI INChIKey SMILES IUPAC name
InChI=1S/CHNS/c2-1-3/h2H GRHBQAYDJPGGLF-UHFFFAOYSA-N S=C=N
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
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' 3539   1974Dra/Wer:369      
2 A' 1989   1974Dra/Wer:369      
3 A' 857   1974Dra/Wer:369      
4 A' 615   1974Dra/Wer:369      
5 A' 469   1974Dra/Wer:369      
6 A" 539   1974Dra/Wer:369      

vibrational zero-point energy: 4004.0 cm-1 (from fundamental vibrations)
Calculated vibrational frequencies for HNCS (Isothiocyanic acid).
Rotational Constants (cm-1) rotational constants
See section I.F.4 to change rotational constant units
A B C reference comment
45.27301 0.19625 0.19499 1980Yam/Win:295

Calculated rotational constants for HNCS (Isothiocyanic acid).
Product of moments of inertia moments of inertia
2765.213amu3Å6   1.26618346360371E-116gm3 cm6
Geometric Data
picture of Isothiocyanic acid

Point Group


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
rHN 0.993 0.006 1 4 1998Kuc
rCN 1.207 0.002 1 2 1998Kuc
rCS 1.567 0.001 2 3 1998Kuc
aHNC 131.7 1.9 2 1 4 1998Kuc
aNCS 173.8 2.3 1 2 3 1998Kuc trans to H

Cartesians
Atom x (Å) y (Å) z (Å)
N1 -0.1610 1.6872 0.0000
C2 0.0000 0.4911 0.0000
S3 0.0401 -1.0748 0.0000
H4 0.4855 2.4406 0.0000

Atom - Atom Distances bond lengths
Distances in Å
  N1 C2 S3 H4
N1   1.20682.76930.9928
C2 1.2068   1.56652.0090
S3 2.76931.5665   3.5435
H4 0.99282.00903.5435  

Calculated geometries for HNCS (Isothiocyanic acid).

Experimental Bond Angles (degrees) from cartesians bond angles

atom1 atom2 atom3 angle         atom1 atom2 atom3 angle
N1 C2 S3 173.800 C2 N1 H4 131.700

Bond descriptions


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

Connectivity
Atom 1 Atom 2
N1 C2
N1 H4
C2 S3
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 Comment
9.920       webbook upper limit
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 False           Cs 2 3
1 2 1Σ C∞v False           C∞v 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 HNCS (Isothiocyanic acid).
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 False       Cs 2 3
1 2 1Σ C∞v False       C∞v 1 1

Calculated electric quadrupole moments for HNCS (Isothiocyanic acid).

References
By selecting the following links, you may be leaving NIST webspace. We have provided these links to other web sites because they may have information that would be of interest to you. No inferences should be drawn on account of other sites being referenced, or not, from this page. There may be other web sites that are more appropriate for your purpose. NIST does not necessarily endorse the views expressed, or concur with the facts presented on these sites. Further, NIST does not endorse any commercial products that may be mentioned on these sites. Please address comments about this page to [email protected].
squib reference DOI
1974Dra/Wer:369 GR Draper, RL Werner "The Rotational-Vibrational Spectra of HNCS and DNCS. An Analysis of the High Resolution Spectra" J. Mol. Spect. 50, 369-402 (1974) 10.1016/0022-2852(74)90242-2
1980Yam/Win:295 K Yamada, M Winnewisser, G Winnewisser, LB Szalanski, MCL Gerry "Ground State Spectroscopic Constants of H[15N]CS, HN{13C]S, and HNC[34S], and the Molecular Strucutre of Isothiocyanic Acid" J. Mol. Spect. 79, 295-313 (1980) 10.1016/0022-2852(80)90215-5
1998Kuc K Kuchitsu(ed) "Structure of Free Polyatomic Molecules - Basic Data" Springer, Berlin, 1998 10.1007/978-3-642-45748-7 
webbook NIST Chemistry Webbook (http://webbook.nist.gov/chemistry) 10.18434/T4D303

Got a better number? Please email us at [email protected]


Browse
PreviousNext