CCCBDB listing of experimental data page 2

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Property	Value	Uncertainty	units	Reference
Hfg(298.15K)	200.50	2.50	kJ mol^-1	1991Set/Fen:1658
Hfg(0K)	206.00	2.50	kJ mol^-1	1991Set/Fen:1658
Entropy (298.15K)	217.30	4.00	J K^-1 mol^-1	1991Set/Fen:1658
Integrated Heat Capacity (0 to 298.15K)	10.44		kJ mol^-1	Gurvich
Heat Capacity (298.15K)	40.43		J K^-1 mol^-1	Gurvich

Mode Number	Symmetry	Frequency			Intensity			Comment	Description
Mode Number	Symmetry	Fundamental(cm^-1)	Harmonic(cm^-1)	Reference	(km mol^-1)	unc.	Reference	Comment	Description
1	A₁	2136		VEEL5
2	A₁	728		VEEL5
3	E	2185		VEEL5
4	E	922		1998Gup/Pra:1607

Description	Value	unc.	Connectivity				Reference	Comment
Description	Value	unc.	Atom 1	Atom 2	Atom 3	Atom 4	Reference	Comment
rSiH	1.468		1	2			1986Yam/Hir:923
aHSiH	110.5		2	1	3		1986Yam/Hir:923
aXSiH	108.42		255	1	2		1986Yam/Hir:923	from symmetry

Atom	x (Å)	y (Å)	z (Å)
Si1	0.0000	0.0000	0.0819
H2	0.0000	1.3928	-0.3820
H3	1.2062	-0.6964	-0.3820
H4	-1.2062	-0.6964	-0.3820

	Si1	H2	H3	H4
Si1		1.4680	1.4680	1.4680
H2	1.4680		2.4124	2.4124
H3	1.4680	2.4124		2.4124
H4	1.4680	2.4124	2.4124

	Computational Chemistry Comparison and Benchmark DataBase Release 22 (May 2022) Standard Reference Database 101 National Institute of Standards and Technology
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State	Config	State description	Conf description	Exp. min.	Dipole (Debye)				Reference	comment	Point Group	Components
State	Config	State description	Conf description	Exp. min.	x	y	z	total	Reference	comment	Point Group	dipole	quadrupole
1	1	²A₁	C_3v	True							C_3v	1	1

squib	reference	DOI
1986Yam/Hir:923	C Yamada, E Hirota "Detection of the Silyl Radical SiH3 by Infrared Diode-Laser Spectroscopy" Phys. Rev. Lett. 56(9), 923, 1986	10.1103/PhysRevLett.56.923
1991Set/Fen:1658	JA Seetula, Y Feng, D Gutman, PW Seakins, MJ Pilling, "Kinetic and Thermochemical Study of the SiH3 + HBr = SiH4 + Br and SiH3 + HI = SiH4 + I Equilibria" J. Phys. Chem. 1991, 95, 1658-1664	10.1021/j100157a030
1998Gup/Pra:1607	Gupte, Prasad, Ground State Geometries and Vibrational Spectra of Small Hyrdogenated Silicon Clusters Using Nonorthogonal Tight-binding Molecular Dynamics, Inter. J. of Mod. Phys. B, Vol. 12, #15, pgs. 1607-1622	10.1142/S0217979298000880
Gurvich	Gurvich, L.V.; Veyts, I. V.; Alcock, C. B., Thermodynamic Properties of Individual Substances, Fouth Edition, Hemisphere Pub. Co., New York, 1989
VEEL5	M.E. Jacox, Vibrational and Electronic Energy Levels of Polyatomic Transient Molecules, J. Phys. Chem.Ref. Data, Monograph 3 (1994) (updated data in NIST Chemistry Webbook - http://webbook.nist.gov/chemistry/
webbook	NIST Chemistry Webbook (http://webbook.nist.gov/chemistry)	10.18434/T4D303

atom1	atom2	atom3	angle		atom1	atom2	atom3	angle
H2	Si1	H3	110.502		H2	Si1	H4	110.502
H3	Si1	H4	110.502

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Experimental data for SiH3- (Silyl anion)

Experimental data for SiH₃^- (Silyl anion)