CCCBDB calculation results Page

Home
- All data for one species
- Geometry
  - Experimental
  - Calculated
  - Comparisons
  - Bad Calculations
    - Bad moment of inertia
  - Tutorials and Explanations
    - Angle formulas
- Vibrations
  - Experimental
    - Vibrational frequencies
  - Calculated
    - Frequencies
  - Scale factors
- Reactions
- Entropies
- Ions
  - List Ions
  - Energy
    - Calculated Ionization Energy
    - Compare Ionzation energy
  - Electron Affinity
    - Calculated Electron affinity
    - Compare Electron affinity
  - Proton Affinity
    - Calculated Proton affinity
    - Compare Proton affinity
  - Ionization changes point group
Experimental
Calculated
- Energy
  - Optimized
  - Reaction
    - Reaction Energy 0K
    - Reaction Energy 298K
  - Internal Rotation
  - Orbital
  - Nuclear repulsion energy
  - Correlation
    - Full vs Frozen core energies
    - Partial correlation energies
  - Ion
  - Excited State
  - Basis Set Extrapolation
    - BSE energy
    - BSE Bond lengths
- Geometry
  - Calculated geometry
    - AIM bond orders
    - One type of bond
  - Rotation
  - Point group
  - State symmetry
  - <r2>
    - Sorted by r2
  - Z-matrix
  - Bad Calculations
- Vibrations
  - Frequencies
    - Animated vibrations
    - Anharmonic
  - Zero point energy (ZPE)
  - Scale Factors
  - Bad Calculations
- Electrostatics
  - Charges
  - Dipole
  - Quadrupole
  - Polarizability
  - Spin
    - Spin density
- Entropy and Heat Capacity
- Reaction
  - Reaction Energy 0K
  - Reaction Energy 298K
  - Isodesmic reactions
  - Transition State
- Lookup by property
  - By frequency
Comparisons
- Geometry
- Vibrations
- Energy
  - Reaction
  - Single point vs optimized
  - DFT grid size on energy
  - Semiempirical enthalpy
  - Internal rotation
  - Similar molecules
- Entropy
- Electrostatics
- Ion
Resources
- Info on Results
  - Calculations Done
  - Basis functions used
  - I/O files
- Glossary
- Conversion Forms
- Links
  - NIST Links
  - External links
- Thermochemistry
- Tutorials
  - Vibrations
    - Why scale vibrations
    - Zero-point energies
  - Entropy
    - Methyl rotor entropy
    - Entropy and conformations
  - Energy
  - Electrostatics
    - Dipole parts by point group
    - Quadrupoles
  - Geometry
    - Angle formulas
  - Cost
    - Cost Comparison
    - Timings Comparison
- Bad Calculations
  - Geometry
  - Vibrations
  - Low excited states
  - Oddities
    - NaCN Is not linear
FAQ Help
- Units
  - Choose Units
  - Explanations
- Credits
- Just show me
  - Show me a calculated geometry
- Summary
- Using
- List
  - Recent molecules
    - Choose a few
  - Molecules
  - Geometry
  - Vibrations
    - Big anharmonicity
  - Energy
    - Enthalpy at 0 Kelvin
  - Similar molecules
  - Ions, Dipoles, etc.
- Index of CCCBDB
- Feedback
  - Error form
  - Wants

	hartrees
Energy at 0K	-263.910319
Energy at 298.15K	-263.918412
Nuclear repulsion energy	227.015192

Mode Number	Symmetry	Frequency (cm^-1)	Scaled Frequency (cm^-1)	IR Intensities (km mol^-1)
1	A	3935	3559	63.60
2	A	3444	3115	10.04
3	A	3413	3087	9.83
4	A	3300	2985	11.73
5	A	3230	2922	36.41
6	A	3185	2880	38.80
7	A	1774	1605	65.11
8	A	1667	1508	9.32
9	A	1638	1482	8.78
10	A	1618	1463	7.73
11	A	1587	1435	49.13
12	A	1553	1405	0.60
13	A	1507	1363	2.23
14	A	1380	1248	14.93
15	A	1251	1132	15.53
16	A	1233	1115	0.31
17	A	1175	1063	31.32
18	A	1168	1056	0.92
19	A	1099	994	11.96
20	A	1054	953	6.89
21	A	1005	909	2.08
22	A	980	886	7.26
23	A	824	745	57.04
24	A	757	684	11.38
25	A	720	651	1.59
26	A	693	626	9.11
27	A	536	485	103.79
28	A	373	337	5.59
29	A	280	253	9.54
30	A	90	82	0.22

Atom	x (Å)	y (Å)	z (Å)
C1	2.100	-0.025	0.000
H2	2.480	0.488	0.878
H3	2.481	-1.035	-0.001
H4	2.480	0.489	-0.878
N5	-0.163	1.041	0.000
H6	0.158	1.977	-0.001
C7	0.607	-0.072	-0.000
N8	-0.114	-1.142	-0.000
C9	-1.420	-0.717	-0.000
H10	-2.232	-1.414	0.000
C11	-1.475	0.628	-0.000
H12	-2.293	1.317	0.000

	C1	H2	H3	H4	N5	H6	C7	N8	C9	H10	C11	H12
C1		1.0856	1.0797	1.0856	2.5018	2.7893	1.4942	2.4797	3.5875	4.5493	3.6347	4.5929
H2	1.0856		1.7584	1.7560	2.8395	2.8950	2.1432	3.1865	4.1751	5.1563	4.0539	4.9226
H3	1.0797	1.7584		1.7584	3.3622	3.8042	2.1074	2.5975	3.9143	4.7284	4.2922	5.3218
H4	1.0856	1.7560	1.7584		2.8392	2.8937	2.1433	3.1869	4.1753	5.1566	4.0537	4.9223
N5	2.5018	2.8395	3.3622	2.8392		0.9900	1.3537	2.1832	2.1612	3.2104	1.3754	2.1469
H6	2.7893	2.8950	3.8042	2.8937	0.9900		2.0982	3.1308	3.1227	4.1490	2.1184	2.5379
C7	1.4942	2.1432	2.1074	2.1433	1.3537	2.0982		1.2894	2.1268	3.1397	2.1969	3.2149
N8	2.4797	3.1865	2.5975	3.1869	2.1832	3.1308	1.2894		1.3733	2.1353	2.2331	3.2850
C9	3.5875	4.1751	3.9143	4.1753	2.1612	3.1227	2.1268	1.3733		1.0700	1.3468	2.2134
H10	4.5493	5.1563	4.7284	5.1566	3.2104	4.1490	3.1397	2.1353	1.0700		2.1782	2.7319
C11	3.6347	4.0539	4.2922	4.0537	1.3754	2.1184	2.1969	2.2331	1.3468	2.1782		1.0685
H12	4.5929	4.9226	5.3218	4.9223	2.1469	2.5379	3.2149	3.2850	2.2134	2.7319	1.0685

atom1	atom2	atom3	angle	atom1	atom2	atom3	angle
C1	C7	N5	122.846	C1	C7	N8	125.799
H2	C1	H3	108.599	H2	C1	H4	107.955
H2	C1	C7	111.377	H3	C1	H4	108.598
H3	C1	C7	108.857	H4	C1	C7	111.378
N5	C7	N8	111.355	N5	C11	C9	105.098
N5	C11	H12	122.422	H6	N5	C7	126.386
H6	N5	C11	126.401	C7	N5	C11	107.212
C7	N8	C9	105.975	N8	C9	H10	121.350
N8	C9	C11	110.359	C9	C11	H12	132.479
H10	C9	C11	128.291

All results from a given calculation for C₄H₆N₂ (1H-Imidazole, 2-methyl-)

using model chemistry: HF/6-311G*

States and conformations

	Computational Chemistry Comparison and Benchmark DataBase Release 22 (May 2022) Standard Reference Database 101 National Institute of Standards and Technology
	Home All data for one species Geometry Experimental Experimental Geometries Same bond/angle many molecules Internal Coordinates by type Bond angles Calculated Calculated geometry Rotational constant Moments of inertia Products of moments of inertia BSE Bond lengths Show me a calculated geometry Comparisons Bonds, angles Rotational Constants Products of moments of inertia Point group Bad Calculations Bad moment of inertia Tutorials and Explanations Angle formulas Vibrations Experimental Vibrational frequencies Calculated Frequencies Scale factors Reactions Entropies Ions List Ions Energy Calculated Ionization Energy Compare Ionzation energy Electron Affinity Calculated Electron affinity Compare Electron affinity Proton Affinity Calculated Proton affinity Compare Proton affinity Ionization changes point group Experimental One molecule all properties One property a few molecules Enthalpy of formation Entropy Integrated Heat Capacity Heat Capacity Rotational Constants Vibrational Frequencies Dipole moment Ionization Energy Polarizability Quadrupole Point Groups Geometry Experimental Geometries Internal Coordinates by type Bond angles Rotational Constants Point Groups Diatomic bond lengths Vibrations Vibrational frequencies Diatomic Triatomics Energy Atomization Energy Internal Rotation Electrostatics Dipole Quadrupole Polarizability Reference Data Reference states Spin Splittings Molecules with good enthalpy Enthalpy at 0 Kelvin Calculated Energy Optimized Energy Energy 298K Minimum conformation Hydrogen bonds H bond with counterpoise Reaction Reaction Energy 0K Reaction Energy 298K Internal Rotation Barriers to internal rotation Rotational barrier and dipole Rotational Barrier 2 molecules Orbital HOMO LUMO gap HOMO Orbital Energies Nuclear repulsion energy Correlation Full vs Frozen core energies Partial correlation energies Ion Calculated Ionization Energy Vertical ionization Energy Calculated Electron affinity Calculated Proton affinity Atom charge differences Excited State Singlet triplet gap Electronic state Transition state Basis Set Extrapolation BSE energy BSE Bond lengths Geometry Calculated geometry AIM bond orders One type of bond Rotation Rotational constant Products of moments of inertia Moments of inertia Inertial defects Second moments Point group State symmetry <r2> Sorted by r2 Z-matrix Bad Calculations Bad moment of inertia Bad Calculated Bond Lengths Bad point group Worst molecules Vibrations Frequencies Animated vibrations Anharmonic Zero point energy (ZPE) Scale Factors Scale factors Scale factor uncertainty Calculate a scale factor Why scale vibrations Set scaling factors Bad Calculations Bad Vib. HF vs MP2 Bad vib. Calc. vs exp. Big anharmonicity Electrostatics Charges Mulliken CHELP Aim ESP Dipole Dipole Dipole angle Dipole calculation types Quadrupole Polarizability Spin Spin density Entropy and Heat Capacity Entropy Reaction entropy Heat Capacity Reaction Reaction Energy 0K Reaction Energy 298K Isodesmic reactions Transition State Transition state Transition state frequencies Transition state geometries IRC Lookup by property By frequency Comparisons Geometry Bonds, angles Bond, angle, or dihedral DFT grid size on point group DFT grid on bond length Core correlation - bond length Same bond/angle many molecules Isoelectronic diatomics Isoelectronic triatomic angles Average bond lengths Rotation Rotational Constants Products of moments of inertia Point group Vibrations Vibrations 2 calculations Frequency differences One frequency Zero point energy Intensity Intensity for one mode Vibrational intensities Reduced mass comparison Anharmonic Triatomic Scale factors Energy Reaction Reaction Energy 0K Reaction Energy 298K Atomization 0K Atomization 298K Single point vs optimized DFT grid size on energy Semiempirical enthalpy Internal rotation Similar molecules Conformation Sets of isomers Sets of tautomers Isomers Entropy Entropy Heat capacity Entropy of several molecules Integrated heat capacity Reaction entropy Electrostatics Dipole Polarizability Several molecules Quadrupole Ion Compare Ionzation energy Koopman ionization energy Koopman IE for a few molecules Compare Electron affinity Compare Proton affinity Protonation Site Resources Info on Results Calculations Done Method and basis set List molecules One molecule Multiple conformers, states Multiple conformers, states Basis functions used I/O files Input/output files MOL file Z-matrix wfn files Glossary Conversion Forms B to I, I to B Angle formulas Integrated heat Capacity Calculating Enthalpy Links NIST Links NIST webbook bibliographic data CCCBDB Experimental data External links Basis Set Exchange Computational Chemistry List Thermochemistry in Gaussian Minnesota Database Collection Benchmark Energy and Geometry Point Groups Thermochemistry Thermochemistry Molecules with good enthalpy A → B + C Reference states Tutorials Vibrations Why scale vibrations Zero-point energies Entropy Methyl rotor entropy Entropy and conformations Energy Getting enthalpy of formation Vertical vs adiabatic IE Thermo from calculations Electrostatics Dipole parts by point group Quadrupoles Geometry Angle formulas Cost Cost Comparison Timings Comparison Bad Calculations Geometry Bad moment of inertia Bad Calculated Bond Lengths Bad point group Worst molecules Vibrations Bad vib. Calc. vs exp. Bad Vib. HF vs MP2 Bad scale factors Low excited states Oddities NaCN Is not linear FAQ Help Units Choose Units Energy Bond length Rotational Constant Moment of Inertia Dipole and Quadrupole Polarizability Explanations Hartree cm-1 Debye Credits Just show me Show me a calculated geometry Summary Using older interface Limit Basis sets Method options List Recent molecules Choose a few Molecules Number of atoms By heavy atoms Diatomics InChI Deuterated Dimers Geometry Point group Point group count Bonds types Isodesmic reactions Bad point group Multiple conformers, states Vibrations Big anharmonicity Energy Enthalpy at 0 Kelvin Similar molecules Similar Isomers Cis/trans Tautomers Multiple conformers, states Ions, Dipoles, etc. List Ions Ionization changes point group Dipole Quadrupole Polarizability Proton Affinities Index of CCCBDB Feedback Error form Wants
You are here: Calculated > Energy > Optimized > Energy

Number	Element	Mulliken	CHELPG	ESP
1	C	-0.689	-0.300	-0.515
2	H	0.225	0.070	0.124
3	H	0.258	0.110	0.165
4	H	0.224	0.070	0.124
5	N	-0.649	-0.294	-0.338
6	H	0.380	0.316	0.339
7	C	0.483	0.544	0.655
8	N	-0.424	-0.622	-0.628
9	C	-0.173	0.157	0.091
10	H	0.213	0.094	0.138
11	C	-0.082	-0.354	-0.405
12	H	0.234	0.208	0.249

	x	y	z	Total
	0.570	3.704	-0.002	3.748
CHELPG
AIM
ESP	0.532	3.670	-0.001	3.709

	x	y	z
x	9.121	0.131	0.000
y	0.131	7.872	-0.000
z	0.000	-0.000	4.602

<r²>	137.247
(<r²>)^1/2	11.715

All results from a given calculation for C4H6N2 (1H-Imidazole, 2-methyl-)

using model chemistry: HF/6-311G*

States and conformations

All results from a given calculation for C₄H₆N₂ (1H-Imidazole, 2-methyl-)