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	-265.467841
Energy at 298.15K	-265.475442
Nuclear repulsion energy	222.381249

Mode Number	Symmetry	Frequency (cm^-1)	Scaled Frequency (cm^-1)	IR Intensities (km mol^-1)
1	A	3525	3518	26.66
2	A	3197	3191	3.67
3	A	3170	3164	4.40
4	A	3066	3060	4.35
5	A	2994	2989	20.45
6	A	2949	2943	40.53
7	A	1525	1522	28.67
8	A	1455	1453	4.75
9	A	1432	1429	3.59
10	A	1421	1418	6.13
11	A	1371	1369	33.83
12	A	1358	1355	0.30
13	A	1327	1325	1.06
14	A	1225	1222	15.49
15	A	1135	1132	4.67
16	A	1093	1090	2.73
17	A	1057	1055	21.50
18	A	1018	1016	0.44
19	A	967	966	10.21
20	A	929	928	2.34
21	A	895	893	2.70
22	A	814	813	12.02
23	A	693	692	50.15
24	A	663	662	6.21
25	A	656	655	0.78
26	A	620	619	11.49
27	A	523	522	60.28
28	A	339	338	5.09
29	A	242	241	5.56
30	A	68	68	0.33

Atom	x (Å)	y (Å)	z (Å)
C1	2.133	-0.024	0.000
H2	2.531	0.493	0.895
H3	2.512	-1.058	-0.001
H4	2.532	0.495	-0.894
N5	-0.170	1.063	0.000
H6	0.150	2.029	-0.002
C7	0.631	-0.068	-0.000
N8	-0.121	-1.172	-0.000
C9	-1.443	-0.738	-0.000
H10	-2.274	-1.446	0.000
C11	-1.502	0.646	-0.000
H12	-2.331	1.355	0.000

	C1	H2	H3	H4	N5	H6	C7	N8	C9	H10	C11	H12
C1		1.1076	1.1015	1.1076	2.5469	2.8538	1.5027	2.5296	3.6468	4.6310	3.6965	4.6720
H2	1.1076		1.7915	1.7894	2.9027	2.9723	2.1743	3.2568	4.2557	5.2584	4.1344	5.0184
H3	1.1015	1.7915		1.7915	3.4192	3.8865	2.1249	2.6346	3.9674	4.8012	4.3605	5.4102
H4	1.1076	1.7894	1.7915		2.9022	2.9696	2.1743	3.2576	4.2562	5.2591	4.1342	5.0181
N5	2.5469	2.9027	3.4192	2.9022		1.0179	1.3863	2.2355	2.2048	3.2737	1.3951	2.1800
H6	2.8538	2.9723	3.8865	2.9696	1.0179		2.1516	3.2124	3.1925	4.2366	2.1542	2.5710
C7	1.5027	2.1743	2.1249	2.1743	1.3863	2.1516		1.3355	2.1794	3.2151	2.2498	3.2861
N8	2.5296	3.2568	2.6346	3.2576	2.2355	3.2124	1.3355		1.3919	2.1707	2.2838	3.3572
C9	3.6468	4.2557	3.9674	4.2562	2.2048	3.1925	2.1794	1.3919		1.0917	1.3855	2.2732
H10	4.6310	5.2584	4.8012	5.2591	3.2737	4.2366	3.2151	2.1707	1.0917		2.2300	2.8011
C11	3.6965	4.1344	4.3605	4.1342	1.3951	2.1542	2.2498	2.2838	1.3855	2.2300		1.0903
H12	4.6720	5.0184	5.4102	5.0181	2.1800	2.5710	3.2861	3.3572	2.2732	2.8011	1.0903

atom1	atom2	atom3	angle	atom1	atom2	atom3	angle
C1	C7	N5	123.617	C1	C7	N8	125.965
H2	C1	H3	108.381	H2	C1	H4	107.754
H2	C1	C7	111.918	H3	C1	H4	108.378
H3	C1	C7	108.378	H4	C1	C7	111.920
N5	C7	N8	110.419	N5	C11	C9	104.915
N5	C11	H12	122.121	H6	N5	C7	126.313
H6	N5	C11	125.722	C7	N5	C11	107.965
C7	N8	C9	106.071	N8	C9	H10	121.389
N8	C9	C11	110.630	C9	C11	H12	132.964
H10	C9	C11	127.981

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

using model chemistry: BLYP/aug-cc-pVDZ

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
1	C	1.178
2	H	-0.261
3	H	-0.336
4	H	-0.261
5	N	0.011
6	H	-0.244
7	C	-0.281
8	N	-0.269
9	C	0.675
10	H	-0.573
11	C	0.960
12	H	-0.599

	x	y	z	Total
	0.576	3.487	-0.003	3.535
CHELPG
AIM
ESP

	x	y	z
x	12.535	-0.072	0.000
y	-0.072	10.306	-0.000
z	0.000	-0.000	6.824

<r²>	142.462
(<r²>)^1/2	11.936

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

using model chemistry: BLYP/aug-cc-pVDZ

States and conformations

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