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Experimental data for HCP (Phosphaethyne)

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Other names
Methinophosphide cation; Phosphaethyne radical cation;
INChI INChIKey SMILES IUPAC name
InChI=1S/CHP/c1-2/h1H/q+1 C#[P+]
State Conformation
2Π C*V
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 Σ 2986 3125 2007Sun/Zha:104312      
2 Σ 1282 1156 2007Sun/Zha:104312       nu3 in ref
3 Π 718 643 2007Sun/Zha:104312       nu2 in ref

vibrational zero-point energy: 2851.5 cm-1 (from fundamental vibrations)
Calculated vibrational frequencies for HCP (Phosphaethyne).
Rotational Constants (cm-1) rotational constants
See section I.F.4 to change rotational constant units
A B C reference comment
  0.62254   2007Sun/Zha:104312

Calculated rotational constants for HCP (Phosphaethyne).
Product of moments of inertia moments of inertia
27.07879amu Å2   4.49661E-39gm cm2
Geometric Data
picture of Phosphaethyne

Point Group C∞v


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
rCH 1.077 0.002 3 2007Sun/Zha:104312 r0
rCP 1.601 0.000 1 2 2007Sun/Zha:104312
aHCP 180 2 1 3 2007Sun/Zha:104312

Cartesians
Atom x (Å) y (Å) z (Å)
C1 0.0000 0.0000 0.0000
P2 0.0000 0.0000 1.6013
H3 0.0000 0.0000 -1.0770

Atom - Atom Distances bond lengths
Distances in Å
  C1 P2 H3
C1   1.60131.0770
P2 1.6013   2.6783
H3 1.07702.6783  

Calculated geometries for HCP (Phosphaethyne).

Experimental Bond Angles (degrees) from cartesians bond angles

atom1 atom2 atom3 angle
P2 C1 H3 180.000

Bond descriptions


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

Connectivity
Atom 1 Atom 2
C1 P2
C1 H3
Electronic energy levels (cm-1)
Energy (cm-1) Degeneracy reference description
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 2Π C∞v True           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 HCP (Phosphaethyne).
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 2Π C∞v True       C∞v 1 1

Calculated electric quadrupole moments for HCP (Phosphaethyne).

References
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squib reference DOI
2007Sun/Zha:104312 FX Sunahori, X Zhang, DJ Clouthier "Electronic spectroscopy of jet-cooled HCP+: Molecular structure, phosphorus hyperfine structure, and Renner-Teller analysis" J. Chem. Phys. 127, 104312 (2007) 10.1063/1.2767264

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