niobium

• Formula: Nb
• Molecular weight: 92.90638
• IUPAC Standard InChI: InChI=1S/Nb Copy

  
• IUPAC Standard InChIKey: GUCVJGMIXFAOAE-UHFFFAOYSA-N Copy
• CAS Registry Number: 7440-03-1
• Chemical structure:
  This structure is also available as a 2d Mol file
• Permanent link for this species. Use this link for bookmarking this species for future reference.
• Information on this page:
  • Gas phase thermochemistry data
  • Condensed phase thermochemistry data
  • Reaction thermochemistry data
  • Gas phase ion energetics data
  • Ion clustering data
  • References
  • Notes
• Data at other public NIST sites:
  • NIST Atomic Spectra Database - Lines Holdings (on physics web site)
  • NIST Atomic Spectra Database - Levels Holdings (on physics web site)
  • NIST Atomic Spectra Database - Ground states and ionization energies (on physics web site)
  • Gas Phase Kinetics Database
  • X-ray Photoelectron Spectroscopy Database, version 5.0
• Options:
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Gas phase thermochemistry data

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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Gas Phase Heat Capacity (Shomate Equation)

C_p° = A + B*t + C*t² + D*t³ + E/t²
H° − H°_298.15= A*t + B*t²/2 + C*t³/3 + D*t⁴/4 − E/t + F − H
S° = A*ln(t) + B*t + C*t²/2 + D*t³/3 − E/(2*t²) + G
    C_p = heat capacity (J/mol*K)
    H° = standard enthalpy (kJ/mol)
    S° = standard entropy (J/mol*K)
    t = temperature (K) / 1000.

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Condensed phase thermochemistry data

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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Liquid Phase Heat Capacity (Shomate Equation)

C_p° = A + B*t + C*t² + D*t³ + E/t²
H° − H°_298.15= A*t + B*t²/2 + C*t³/3 + D*t⁴/4 − E/t + F − H
S° = A*ln(t) + B*t + C*t²/2 + D*t³/3 − E/(2*t²) + G
    C_p = heat capacity (J/mol*K)
    H° = standard enthalpy (kJ/mol)
    S° = standard entropy (J/mol*K)
    t = temperature (K) / 1000.

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Solid Phase Heat Capacity (Shomate Equation)

C_p° = A + B*t + C*t² + D*t³ + E/t²
H° − H°_298.15= A*t + B*t²/2 + C*t³/3 + D*t⁴/4 − E/t + F − H
S° = A*ln(t) + B*t + C*t²/2 + D*t³/3 − E/(2*t²) + G
    C_p = heat capacity (J/mol*K)
    H° = standard enthalpy (kJ/mol)
    S° = standard entropy (J/mol*K)
    t = temperature (K) / 1000.

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View table.

Reaction thermochemistry data

Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Gas phase ion energetics data, Ion clustering data, References, Notes

Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Data compiled by: Michael M. Meot-Ner (Mautner) and Sharon G. Lias

Note: Please consider using the reaction search for this species. This page allows searching of all reactions involving this species. A general reaction search form is also available. Future versions of this site may rely on reaction search pages in place of the enumerated reaction displays seen below.

Individual Reactions

 +  = ( • )

By formula: Nb⁺ + Nb = (Nb⁺ • Nb)

Enthalpy of reaction

( • 9) +  = ( • 10)

By formula: (Nb⁺ • 9Nb) + Nb = (Nb⁺ • 10Nb)

Enthalpy of reaction

( • 2) +  = ( • 3)

By formula: (Nb⁺ • 2Nb) + Nb = (Nb⁺ • 3Nb)

Enthalpy of reaction

( • 3) +  = ( • 4)

By formula: (Nb⁺ • 3Nb) + Nb = (Nb⁺ • 4Nb)

Enthalpy of reaction

( • 4) +  = ( • 5)

By formula: (Nb⁺ • 4Nb) + Nb = (Nb⁺ • 5Nb)

Enthalpy of reaction

( • 5) +  = ( • 6)

By formula: (Nb⁺ • 5Nb) + Nb = (Nb⁺ • 6Nb)

Enthalpy of reaction

( • 6) +  = ( • 7)

By formula: (Nb⁺ • 6Nb) + Nb = (Nb⁺ • 7Nb)

Enthalpy of reaction

( • 7) +  = ( • 8)

By formula: (Nb⁺ • 7Nb) + Nb = (Nb⁺ • 8Nb)

Enthalpy of reaction

( • 8) +  = ( • 9)

By formula: (Nb⁺ • 8Nb) + Nb = (Nb⁺ • 9Nb)

Enthalpy of reaction

( • ) +  = ( • 2)

By formula: (Nb⁺ • Nb) + Nb = (Nb⁺ • 2Nb)

Enthalpy of reaction

Gas phase ion energetics data

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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Data evaluated as indicated in comments:
L - Sharon G. Lias

Data compiled as indicated in comments:
LL - Sharon G. Lias and Joel F. Liebman
LBLHLM - Sharon G. Lias, John E. Bartmess, Joel F. Liebman, John L. Holmes, Rhoda D. Levin, and W. Gary Mallard
LLK - Sharon G. Lias, Rhoda D. Levin, and Sherif A. Kafafi
RDSH - Henry M. Rosenstock, Keith Draxl, Bruce W. Steiner, and John T. Herron
B - John E. Bartmess

View reactions leading to Nb⁺ (ion structure unspecified)

Electron affinity determinations

Ionization energy determinations

Ion clustering data

Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Reaction thermochemistry data, Gas phase ion energetics data, References, Notes

Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Data compiled by: Michael M. Meot-Ner (Mautner) and Sharon G. Lias

Note: Please consider using the reaction search for this species. This page allows searching of all reactions involving this species. Searches may be limited to ion clustering reactions. A general reaction search form is also available.

Clustering reactions

 +  = ( • )

By formula: Nb⁺ + Nb = (Nb⁺ • Nb)

Enthalpy of reaction

( • ) +  = ( • 2)

By formula: (Nb⁺ • Nb) + Nb = (Nb⁺ • 2Nb)

Enthalpy of reaction

( • 2) +  = ( • 3)

By formula: (Nb⁺ • 2Nb) + Nb = (Nb⁺ • 3Nb)

Enthalpy of reaction

( • 3) +  = ( • 4)

By formula: (Nb⁺ • 3Nb) + Nb = (Nb⁺ • 4Nb)

Enthalpy of reaction

( • 4) +  = ( • 5)

By formula: (Nb⁺ • 4Nb) + Nb = (Nb⁺ • 5Nb)

Enthalpy of reaction

( • 5) +  = ( • 6)

By formula: (Nb⁺ • 5Nb) + Nb = (Nb⁺ • 6Nb)

Enthalpy of reaction

( • 6) +  = ( • 7)

By formula: (Nb⁺ • 6Nb) + Nb = (Nb⁺ • 7Nb)

Enthalpy of reaction

( • 7) +  = ( • 8)

By formula: (Nb⁺ • 7Nb) + Nb = (Nb⁺ • 8Nb)

Enthalpy of reaction

( • 8) +  = ( • 9)

By formula: (Nb⁺ • 8Nb) + Nb = (Nb⁺ • 9Nb)

Enthalpy of reaction

( • 9) +  = ( • 10)

By formula: (Nb⁺ • 9Nb) + Nb = (Nb⁺ • 10Nb)

Enthalpy of reaction

References

Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Reaction thermochemistry data, Gas phase ion energetics data, Ion clustering data, Notes

Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Chase, 1998
Chase, M.W., Jr., NIST-JANAF Themochemical Tables, Fourth Edition, J. Phys. Chem. Ref. Data, Monograph 9, 1998, 1-1951. [all data]

Loh, Lian, et al., 1988
Loh, S.K.; Lian, L.; Hales, D.A.; Armentrout, P.B., Collision - Induced Dissociation Processes of Nb4+ and Fe4+: Fission vs Evaporation, J. Chem. Phys., 1988, 89, 1, 610, https://doi.org/10.1063/1.455455 . [all data]

Armentrout and Kickel, 1994
Armentrout, P.B.; Kickel, B.L., Gas Phase Thermochemistry of Transition Metal Ligand Systems: Reassessment of Values and Periodic Trends, in Organometallic Ion Chemistry, B. S. Freiser, ed, 1994. [all data]

Feigerle, Corderman, et al., 1981
Feigerle, C.S.; Corderman, R.R.; Bobashev, S.V.; Lineberger, W.C., Binding Energies and Structure of Transition Metal Negative Ions, J. Chem. Phys., 1981, 74, 3, 1580, https://doi.org/10.1063/1.441289 . [all data]

Lide, 1992
Lide, D.R. (Editor), Ionization potentials of atoms and atomic ions in Handbook of Chem. and Phys., 1992, 10-211. [all data]

Rayner, Mitchell, et al., 1987
Rayner, D.M.; Mitchell, S.A.; Bourne, O.L.; Hackett, P.A., First-ionization potential of niobium and molybdenum by double-resonance, field-ionization spectroscopy, J. Opt. Soc. Am. B, 1987, 4, 900. [all data]

Rauh and Ackermann, 1979
Rauh, E.G.; Ackermann, R.J., The first ionization potentials of the transition metals, J. Chem. Phys., 1979, 70, 1004. [all data]

Gupta and Gingerich, 1978
Gupta, S.K.; Gingerich, K.A., Mass spectrometric observation dissociation energy of the gaseous molecule MoNb, J. Chem. Phys., 1978, 69, 4318. [all data]

Moore, 1970
Moore, C.E., Ionization potentials and ionization limits derived from the analyses of optical spectra, Natl. Stand. Ref. Data Ser., (U.S. Natl. Bur. Stand.), 1970, 34, 1. [all data]

Notes

Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Reaction thermochemistry data, Gas phase ion energetics data, Ion clustering data, References

• Symbols used in this document:
  

  EA	Electron affinity
  IE (evaluated)	Recommended ionization energy
  S°gas,1 bar	Entropy of gas at standard conditions (1 bar)
  S°liquid,1 bar	Entropy of liquid at standard conditions (1 bar)
  S°solid	Entropy of solid at standard conditions
  T	Temperature
  ΔfH°gas	Enthalpy of formation of gas at standard conditions
  ΔfH°liquid	Enthalpy of formation of liquid at standard conditions
  ΔrH°	Enthalpy of reaction at standard conditions

• Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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