National Institute of Standards and Technology
Computational Chemistry Comparison and Benchmark DataBase
Release 22May 2022
NIST Standard Reference Database 101
IIntroduction
IIExperimental data
IIICalculated data
IVData comparisons
VCost comparisons
VIInput and output files
VIITutorials and Units
VIIILinks to other sites
IXFeedback
XOlder CCCBDB versions
XIIGeometries
XIII Vibrations
XIVReaction data
XVEntropy data
XVIBibliographic data
XVIIIon data
XVIIIBad calculations
XIXIndex of properties
XXH-bond dimers
XXIOddities

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II.B.3. (XII.A.3.)

List of experimental bond lengths for bond type rNN

Bond lengths in Å.
Click on an entry for more experimental geometry data.
bond type Species Name Length Comment
rN#N N2 Nitrogen diatomic 1.098 re
rN#N N2O Nitrous oxide 1.128
rN#N HN3 hydrogen azide 1.133
rN=N CH2NN diazomethane 1.139 rs
rNN N3 azide radical 1.181 r0
rN=N N2 Nitrogen diatomic 1.213 re
rN=N N2F2 (Z)-Difluorodiazene 1.214
rN=N CH2N2 diazirine 1.228
rNN HN3 hydrogen azide 1.237
rN=N N2H2 (E)-diazene 1.252
rN:N C4H4N2 Pyridazine 1.332
rNN C3H4N2 1H-Pyrazole 1.351
rNN C2H2N2S 1,3,4-Thiadiazole 1.371
rNN C2H3N3 1H-1,2,4-Triazole 1.380
rNN C2H6N2O2 Dimethylnitroamine 1.382
rNN N2H4 Hydrazine 1.446
rNN N2O4 Dinitrogen tetroxide 1.782
rNN N2O3 Dinitrogen trioxide 1.864
rNN ONNO NO dimer 2.236
 
Average 1.367 ±0.293
Min 1.098
Max 2.236