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Experimental data for CH2PH (Phosphaethene)

22 02 02 11 45
Other names
Phosphaethene; methylenephosphane;
INChI INChIKey SMILES IUPAC name
InChI=1S/CH3P/c1-2/h2H,1H2 HIQXJRBKNONWAH-UHFFFAOYSA-N [CH2]=[PH] methylenephosphane
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
Hfg(298.15K) enthalpy of formation     kJ mol-1 webbook
Hfg(0K) enthalpy of formation -281.83   kJ mol-1 webbook
Entropy (298.15K) entropy     J K-1 mol-1  
Integrated Heat Capacity (0 to 298.15K) integrated heat capacity     kJ mol-1  
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

Calculated vibrational frequencies for CH2PH (Phosphaethene).
Rotational Constants (cm-1) rotational constants
See section I.F.4 to change rotational constant units
A B C reference comment
4.61997 0.54765 0.48864 1981Kro/Nix:367

Calculated rotational constants for CH2PH (Phosphaethene).
Product of moments of inertia moments of inertia
3874.881amu3Å6   1.77429731942402E-116gm3 cm6
Geometric Data
picture of Phosphaethene

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
rCH 1.090 0.015 1 3 1981Kro/Nix:367 cis
rCH 1.090 0.015 1 4 1981Kro/Nix:367 trans
rCP 1.673 0.002 1 2 1981Kro/Nix:367
rPH 1.420 0.006 2 5 1981Kro/Nix:367
aHCP 124.4 0.8 2 1 3 1981Kro/Nix:367 cis H
aHCP 118.4 1.2 2 1 4 1981Kro/Nix:367 trans H
aHCH 117.2 1.2 3 1 4 1981Kro/Nix:367
aHPC 97.4 0.4 1 2 5 1981Kro/Nix:367
dHCPH 0 3 1 2 5 1981Kro/Nix:367

Cartesians
Atom x (Å) y (Å) z (Å)

Atom - Atom Distances bond lengths
Distances in Å
 

Calculated geometries for CH2PH (Phosphaethene).

Bond descriptions


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

Connectivity
Atom 1 Atom 2
C1 P2
C1 H3
C1 H4
P2 H5
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
    10.300 0.200 1981Kro/Nix:367
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 True       0.869 1981Kro/Nix:367 μa=0.731, μb=0.470 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 CH2PH (Phosphaethene).
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 True       Cs 2 3

Calculated electric quadrupole moments for CH2PH (Phosphaethene).

References
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squib reference DOI
1981Kro/Nix:367 HW Kroto, JF Nixon, K Ohno "THE MICROWAVE-SPECTRUM, STRUCTURE, AND DIPOLE-MOMENT OF THE UNSTABLE MOLECULE PHOSPHAETHENE, CH2=PH" J. Mol. Spect. 90(2) 367-373, 1981 10.1016/0022-2852(81)90134-X
webbook NIST Chemistry Webbook (http://webbook.nist.gov/chemistry) 10.18434/T4D303

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