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Experimental data for C6H4Cl2 (1,4-dichlorobenzene)

22 02 02 11 45
Other names
Benzene, p-dichloro-; p-Dichlorobenzene; paradichlorobenzene;
INChI INChIKey SMILES IUPAC name
InChI=1S/C6H4Cl2/c7-5-1-2-6(8)4-3-5/h1-4H OCJBOOLMMGQPQU-UHFFFAOYSA-N ClC1=CC=C(Cl)C=C1 1,4-Dichlorobenzene
State Conformation
1AG D2H
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 24.90 4.20 kJ mol-1 TRC
Hfg(0K) enthalpy of formation   4.20 kJ mol-1 TRC
Entropy (298.15K) entropy 337.40 3.40 J K-1 mol-1 TRC
Heat Capacity (298.15K) heat capacity 114.30 1.10 J K-1 mol-1 TRC
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 Ag 3072   1970Gre:1503       1
2 Ag 1574           2
3 Ag 1169           3
4 Ag 1096           4
5 Ag 747           5
6 Ag 328           6
7 Au 951           16
8 Au 405           17
9 B1g 815           7
10 B1u 3078           18
11 B1u 1477           19
12 B1u 1090           20
13 B1u 1015           21
14 B1u 550           22
15 B2g 934           8
16 B2g 687           9
17 B2g 298           10
18 B2u 3087           23
19 B2u 1394           24
20 B2u 1220           25
21 B2u 1107           26
22 B2u 226           27
23 B3g 3065           11
24 B3g 1574           12
25 B3g 1290           13
26 B3g 626           14
27 B3g 350           15
28 B3u 819           28
29 B3u 485           29
30 B3u 122           30

vibrational zero-point energy: 17325.5 cm-1 (from fundamental vibrations)
Calculated vibrational frequencies for C6H4Cl2 (1,4-dichlorobenzene).
Gas-phase IR spectra can be found in the NIST Chemistry Webbook here.
Rotational Constants (cm-1) rotational constants
See section I.F.4 to change rotational constant units
A B C reference comment

Calculated rotational constants for C6H4Cl2 (1,4-dichlorobenzene).
Product of moments of inertia moments of inertia
amu3Å6   0gm3 cm6
Geometric Data
picture of 1,4-dichlorobenzene

Point Group D2h


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
rCC 1.388 0.001 1 3 1987Kuchitsu(II/15)
rCC 1.394 0.002 3 6 1987Kuchitsu(II/15)
rCCl 1.729 0.001 1 7 1987Kuchitsu(II/15)
rHC 1.081 0.004 3 9 1987Kuchitsu(II/15)
aCCC 121.6 0.1 3 1 4 1987Kuchitsu(II/15)
aHCC 120 3 6 12 1987Kuchitsu(II/15) assumed

These cartesians were determined using some assumed coordinate values. Cartesians
Atom x (Å) y (Å) z (Å)

Atom - Atom Distances bond lengths
Distances in Å
 

Calculated geometries for C6H4Cl2 (1,4-dichlorobenzene).

Bond descriptions


Examples: C-C single bond, C=C, double bond, C#C triple bond, C:C aromatic bond
Bond Type Count
C:C 6
H-C 4
C-Cl 2

Connectivity
Atom 1 Atom 2
C1 C3
C1 C4
C1 Cl7
C2 C5
C2 C6
C2 Cl8
C3 C6
C3 H9
C4 C5
C4 H10
C5 H11
C6 H12
Electronic energy levels (cm-1)
Energy (cm-1) Degeneracy reference description
0 1   1AG

Ionization Energies (eV)
Ionization Energy I.E. unc. vertical I.E. v.I.E. unc. reference
8.920 0.030     webbook
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 1AG D2h True           D2h 0 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 C6H4Cl2 (1,4-dichlorobenzene).
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 1AG D2h True       D2h 0 2

Calculated electric quadrupole moments for C6H4Cl2 (1,4-dichlorobenzene).

References
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squib reference DOI
1970Gre:1503 JHS Green "Vibrational spectra of benzene derivatives - VI. p-Disubstituted compounds" Spectrochimica Acta A 26, 1503-1513, 1970 10.1016/0584-8539(70)80211-2
1987Kuchitsu(II/15) Kuchitsu (ed.), Landolt-Bornstein: Group II: Atomic and Molecular Physics Volume 15: Structure Data of Free Polyatomic Molecules. Springer-Verlag, Berlin, 1987.  
TRC Frenkel, M; Marsh, K.N.; Wilhoit, R.C.; Kabo, G.J.; Roganov, G.N.,Thermodynamics of Organic Compounds in the Gas State,Thermodynamics Research Center, College Station, TX, 1994  
webbook NIST Chemistry Webbook (http://webbook.nist.gov/chemistry) 10.18434/T4D303

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