Pentaborane(11)

Formula: B₅H₁₁
Molecular weight: 65.142
IUPAC Standard InChI: InChI=1S/B5H11/c6-1-3-2-5(3,7-2)4(1,3,6)8-5/h4-5H,1-3H2
IUPAC Standard InChIKey: LVRADNQEQFFNNW-UHFFFAOYSA-N
CAS Registry Number: 18433-84-6
Chemical structure:
This structure is also available as a 2d Mol file
Other names: Boron hydride (B5H11)
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Information on this page:
Other data available:
- Mass spectrum (electron ionization)
Data at other public NIST sites:
- Gas Phase Kinetics Database
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Gas phase ion energetics data

Data compiled as indicated in comments:
LLK - Sharon G. Lias, Rhoda D. Levin, and Sherif A. Kafafi
RDSH - Henry M. Rosenstock, Keith Draxl, Bruce W. Steiner, and John T. Herron

Ionization energy determinations

IE (eV)	Method	Reference	Comment
10.1	PE	Ulman and Fehlner, 1978	LLK
10.7	PE	Ulman and Fehlner, 1978	Vertical value; LLK

Appearance energy determinations

Ion	AE (eV)	Other Products	Method	Reference	Comment
B₅H₄⁺	14.2 ± 0.4	3H₂+H	EI	Fehlner and Koski, 1964	RDSH
B₅H₅⁺	12.7 ± 0.2	3H₂	EI	Fehlner and Koski, 1964	RDSH
B₅H₆⁺	12.6 ± 0.3	2H₂+H	EI	Fehlner and Koski, 1964	RDSH
B₅H₇⁺	11.5 ± 0.2	2H₂	EI	Fehlner and Koski, 1964	RDSH
B₅H₈⁺	12.0 ± 0.3	H₂+H	EI	Fehlner and Koski, 1964	RDSH
B₅H₉⁺	10.3	H₂	EI	Fehlner and Koski, 1964	RDSH
B₅H₁₀⁺	11.8	H	EI	Fehlner and Koski, 1964	RDSH

References

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Ulman and Fehlner, 1978
Ulman, J.A.; Fehlner, T.P., Ultraviolet photoelectron spectroscopy of boranes and carboranes. Five-, six-, and seven- atom frameworks, J. Am. Chem. Soc., 1978, 100, 449. [all data]

Fehlner and Koski, 1964
Fehlner, T.P.; Koski, W.S., The fragmentation of some boron hydrides by electron impact, J. Am. Chem. Soc., 1964, 86, 581. [all data]

Notes

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Symbols used in this document:

AE Appearance energy
Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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