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Disilane, hexamethyl-

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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.

Data compiled by: Eugene S. Domalski and Elizabeth D. Hearing

Constant pressure heat capacity of liquid

Cp,liquid (cal/mol*K) Temperature (K) Reference Comment
61.159295.67Suga and Seki, 1959T = 200 to 300 K. Value is unsmoothed experimental datum.

Phase change 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 compiled as indicated in comments:
BS - Robert L. Brown and Stephen E. Stein
TRC - Thermodynamics Research Center, NIST Boulder Laboratories, Chris Muzny, director
AC - William E. Acree, Jr., James S. Chickos
CAL - James S. Chickos, William E. Acree, Jr., Joel F. Liebman, Students of Chem 202 (Introduction to the Literature of Chemistry), University of Missouri -- St. Louis
DH - Eugene S. Domalski and Elizabeth D. Hearing

Quantity Value Units Method Reference Comment
Tboil386.KN/AFarchan Laboratories, 1990BS
Tboil386.KN/APCR Inc., 1990BS
Quantity Value Units Method Reference Comment
Tfus287.1KN/ATakagi, Ishikawa, et al., 1986Uncertainty assigned by TRC = 0.1 K; TRC
Tfus287.22KN/ATakagi, Ishikawa, et al., 1986Uncertainty assigned by TRC = 0.05 K; TRC
Tfus287.7KN/ASuga and Seki, 1959, 2Crystal phase 1 phase; Uncertainty assigned by TRC = 0.2 K; TRC

Enthalpy of vaporization

DeltavapH (kcal/mol) Temperature (K) Method Reference Comment
8.68320.EBTakagi, Ishikawa, et al., 1986, 2Based on data from 305. - 387. K.; AC
8.89288. - 310.N/ASuga and Seki, 1959See also Takagi, Ishikawa, et al., 1986, 2.; AC
8.80294. - 334.N/ABrockway and Davidson, 1941See also Takagi, Ishikawa, et al., 1986, 2.; AC

Enthalpy of fusion

DeltafusH (kcal/mol) Temperature (K) Reference Comment
0.722287.7Domalski and Hearing, 1996AC

Entropy of fusion

DeltafusS (cal/mol*K) Temperature (K) Reference Comment
10.50221.8Domalski and Hearing, 1996CAL
2.507287.7

Enthalpy of phase transition

DeltaHtrs (kcal/mol) Temperature (K) Initial Phase Final Phase Reference Comment
2.330221.8crystaline, IIcrystaline, ISuga and Seki, 1959DH
0.7211287.7crystaline, IliquidSuga and Seki, 1959DH

Entropy of phase transition

DeltaStrs (cal/mol*K) Temperature (K) Initial Phase Final Phase Reference Comment
10.51221.8crystaline, IIcrystaline, ISuga and Seki, 1959DH
2.507287.7crystaline, IliquidSuga and Seki, 1959DH

In addition to the Thermodynamics Research Center (TRC) data available from this site, much more physical and chemical property data is available from the following TRC products:


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 compiled as indicated in comments:
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

Ionization energy determinations

IE (eV) Method Reference Comment
8.27 ± 0.05PIPECOSzepes and Baer, 1984T = 298K; LBLHLM
8.27 ± 0.05PIPECOSzepes and Baer, 1984T = 0K; LBLHLM
8.27 ± 0.05PIPECOSzepes and Baer, 1984, 2T = 0K; LBLHLM
8.4PESzepes, Koranyi, et al., 1981LLK
8.0PEPotzinger, Ritter, et al., 1975LLK
8.35 ± 0.12EILappert, Pedley, et al., 1971LLK
8.46 ± 0.15EIGaidis, Briggs, et al., 1971LLK
8.00 ± 0.01EIPitt, Bursey, et al., 1970RDSH
8.35 ± 0.12EILappert, Simpson, et al., 1969RDSH
8.79 ± 0.08EIHess, Lampe, et al., 1965RDSH
8.68PEMochida, Worley, et al., 1985Vertical value; LBLHLM
8.7 ± 0.05PESzepes, Koranyi, et al., 1981Vertical value; LLK
8.69PEKhvostenko, Zykov, et al., 1981Vertical value; LLK
8.69PEBock and Ensslin, 1971Vertical value; LLK

Appearance energy determinations

Ion AE (eV) Other Products MethodReferenceComment
C3H9Si+9.8 ± 0.1C3H9SiPIPECOSzepes and Baer, 1984T = 0K; LBLHLM
C3H9Si+9.9(CH3)3SiEIPotzinger, Ritter, et al., 1975LLK
C3H9Si+10.22 ± 0.18(CH3)3SiEILappert, Pedley, et al., 1971LLK
C3H9Si+10.22 ± 0.18?EILappert, Simpson, et al., 1969RDSH
C3H9Si+10.0 ± 0.1?EIBand, Davidson, et al., Commun. 1967RDSH
C3H9Si+10.0 ± 0.1?EIConnor, Finney, et al., 1966RDSH
C3H9Si+10.69 ± 0.04?EIHess, Lampe, et al., 1964RDSH
C5H15Si2+9.6 ± 0.1CH3PIPECOSzepes and Baer, 1984T = 0K; LBLHLM
C5H15Si2+9.6 ± 0.1CH3PIPECOSzepes and Baer, 1984, 2T = 0K; LBLHLM
C5H15Si2+10.74 ± 0.08CH3EIHess, Lampe, et al., 1965RDSH

IR Spectrum

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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 compiled by: Coblentz Society, Inc.

Condensed Phase Spectrum

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IR spectrum
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Notice: Except where noted, spectra from this collection were measured on dispersive instruments, often in carefully selected solvents, and hence may differ in detail from measurements on FTIR instruments or in other chemical environments. More information on the manner in which spectra in this collection were collected can be found here.

Notice: Concentration information is not available for this spectrum and, therefore, molar absorptivity values cannot be derived.

Additional Data

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Owner Copyright (C) 1987 by the Coblentz Society
Collection (C) 2018 copyright by the U.S. Secretary of Commerce
on behalf of the United States of America. All rights reserved.
Origin DOW CORNING CORP.
Source reference COBLENTZ NO. 5542
Date 1965/11/10
Name(s) 1,1,1,2,2,2-hexamethyldisilane
State SOLUTION (10% CCl4 FOR 3800-1300, 2% CS2 FOR 1300-650, AND 10% CCl4 FOR 650-250)
Instrument PERKIN-ELMER 521 (GRATING)
Instrument parameters FILTERS AT 3150, 2500, 2000, 1150, 700, 410. GRATING CHANGES: 2000, 630
Path length 0.010 CM, 0.011 CM, AND 0.010 CM
Resolution 2
Boiling point 113 C

This IR spectrum is from the Coblentz Society's evaluated infrared reference spectra collection.


Mass spectrum (electron ionization)

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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 compiled by: NIST Mass Spectrometry Data Center, William E. Wallace, director

Spectrum

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Mass spectrum
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Additional Data

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Owner NIST Mass Spectrometry Data Center
Collection (C) 2014 copyright by the U.S. Secretary of Commerce
on behalf of the United States of America. All rights reserved.
Origin Japan AIST/NIMC Database- Spectrum MS-NW-9254
NIST MS number 236663

All mass spectra in this site (plus many more) are available from the NIST/EPA/NIH Mass Spectral Library. Please see the following for information about the library and its accompanying search program.


Gas Chromatography

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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 compiled by: NIST Mass Spectrometry Data Center, William E. Wallace, director

Kovats' RI, non-polar column, isothermal

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Column type Active phase Temperature (C) I Reference Comment
PackedC78, Branched paraffin130.686.1Dallos, Sisak, et al., 2000He; Column length: 3.3 m
PackedC78, Branched paraffin130.685.9Reddy, Dutoit, et al., 1992Chromosorb G HP; Column length: 3.3 m

Normal alkane RI, non-polar column, temperature ramp

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Column type Active phase I Reference Comment
CapillarySqualane698.Szekely, Nefedov, et al., 1967Nitrogen, 5. K/min; Column length: 50. m; Column diameter: 0.25 mm; Tstart: 60. C; Tend: 250. C

Normal alkane RI, non-polar column, custom temperature program

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Column type Active phase I Reference Comment
CapillarySqualane699.Szekely, Nefedov, et al., 1967Nitrogen; Column length: 50. m; Column diameter: 0.25 mm; Program: not specified

References

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

Suga and Seki, 1959
Suga, H.; Seki, S., On the phase transition of hexamethyldisilane, Bull. Chem. Soc. Japan, 1959, 32, 1088-1093. [all data]

Farchan Laboratories, 1990
Farchan Laboratories, Research Chemicals Catalog, Farchan Laboratories, Gainesville, FL, 1990, 91. [all data]

PCR Inc., 1990
PCR Inc., Research Chemicals Catalog 1990-1991, PCR Inc., Gainesville, FL, 1990, 1. [all data]

Takagi, Ishikawa, et al., 1986
Takagi, S.; Ishikawa, M.; Kumada, M.; Kimura, T.; Fujishiro, R., Vapor Pressure and Thermo. Prop. of Hexamethyldisilane at 305-387 K, Thermochim. Acta, 1986, 109, 55. [all data]

Suga and Seki, 1959, 2
Suga, H.; Seki, S., On the phase transition of hexamethyldisilane, Bull. Chem. Soc. Jpn., 1959, 32, 1088. [all data]

Takagi, Ishikawa, et al., 1986, 2
Takagi, Sadao; Ishikawa, Mitsuo; Kumada, Makoto; Kimura, Takayoshi; Fujishiro, Ryoichi, Vapour pressure and thermodynamic properties of hexamethyldisilane at 305--387 K, Thermochimica Acta, 1986, 109, 1, 55-61, https://doi.org/10.1016/0040-6031(86)85007-9 . [all data]

Brockway and Davidson, 1941
Brockway, L.O.; Davidson, N.R., The Molecular Structures of the Dimers of Aluminum Dimethyl Chloride, Aluminum Dimethyl Bromide, and Aluminum Trimethyl and of Hexamethyldisilane, J. Am. Chem. Soc., 1941, 63, 12, 3287-3297, https://doi.org/10.1021/ja01857a018 . [all data]

Domalski and Hearing, 1996
Domalski, Eugene S.; Hearing, Elizabeth D., Heat Capacities and Entropies of Organic Compounds in the Condensed Phase. Volume III, J. Phys. Chem. Ref. Data, 1996, 25, 1, 1, https://doi.org/10.1063/1.555985 . [all data]

Szepes and Baer, 1984
Szepes, L.; Baer, T., Dissociation dynamics of energy selected hexamethyldisilane ions and the heats of formation of (CH3)3Si+ and (CH3)3Si, J. Am. Chem. Soc., 1984, 106, 273. [all data]

Szepes and Baer, 1984, 2
Szepes, L.; Baer, T., (CH3)3SiX tipusu vegyuletek vizsgalata fotoelectron-fotoion koincidenciaval,I. Meghatarozott belso energiaju hexametil-diszilan-ionok disszociaciojanak dinamikaja, Magy. Kem. Foly., 1984, 90, 104. [all data]

Szepes, Koranyi, et al., 1981
Szepes, L.; Koranyi, T.; Naray-Szabo, G.; Modelli, A.; Distefano, G., Ultraviolet photoelectron spectra of group IV hexamethyl derivatives containing a metal-metal bond, J. Organomet. Chem., 1981, 217, 35. [all data]

Potzinger, Ritter, et al., 1975
Potzinger, P.; Ritter, A.; Krause, J., Massenspektrometrische Bestimmung von Bindungsenergien in siliciumorganischen Verbindungen, Z. Naturforsch. A:, 1975, 30, 347. [all data]

Lappert, Pedley, et al., 1971
Lappert, M.F.; Pedley, J.B.; Simpson, J.; Spalding, T.R., Bonding studies of compounds of boron and the Group IV elements. VI. Mass spectrometric studies on compounds Me4M and Me3M-M'Me3 (M and M'=C, Si, Ge, Sn, and Pb): thermochemical data, J. Organomet. Chem., 1971, 29, 195. [all data]

Gaidis, Briggs, et al., 1971
Gaidis, J.M.; Briggs, P.R.; Shannon, T.W., Mass spectra of disilanes. Phenyl-silicon interaction and silicon-silicon bond strength, J. Phys. Chem., 1971, 75, 974. [all data]

Pitt, Bursey, et al., 1970
Pitt, C.G.; Bursey, M.M.; Rogerson, P.F., Catenates of the group IV elements. Correlation of «sigma» electron energies, J. Am. Chem. Soc., 1970, 92, 519. [all data]

Lappert, Simpson, et al., 1969
Lappert, M.F.; Simpson, J.; Spalding, T.R., Bonding studies of compounds of the group IV elements: ionisation potentials of the Me3M radicals, J.Organometal. Chem., 1969, 17, PI. [all data]

Hess, Lampe, et al., 1965
Hess, G.G.; Lampe, F.W.; Sommer, L.H., An electron impact study of ionization and dissociation of trimethylsilanes, J. Am. Chem. Soc., 1965, 87, 5327. [all data]

Mochida, Worley, et al., 1985
Mochida, K.; Worley, S.; Kochi, J., UV photoelectron spectra of peralkylated catenates of Group 4B elements (silicon, germanium, and tin), Bull. Chem. Soc. Jpn., 1985, 58, 3389. [all data]

Khvostenko, Zykov, et al., 1981
Khvostenko, V.I.; Zykov, B.G.; Yuriev, V.P.; Mironov, V.F.; Kovel'zon, G.I.; Panasenko, A.A.; Sheludyakov, V.D.; Gailyunas, I.A., Study of d(«pi»)-p(«pi») interaction in vinyl- and alkylsilicon-containing compounds by photoelectron spectroscopy, J. Organomet. Chem., 1981, 218, 155. [all data]

Bock and Ensslin, 1971
Bock, H.; Ensslin, W., Bond-bond interaction in polysilanes, Angew. Chem. Int. Ed. Engl., 1971, 10, 404. [all data]

Band, Davidson, et al., Commun. 1967
Band, S.J.; Davidson, I.M.T.; Lambert, C.A.; Stephenson, I.L., Bond dissociation energies and heats of formation of trimethylsilyl compounds, Chem., Commun. 1967, 723. [all data]

Connor, Finney, et al., 1966
Connor, J.A.; Finney, G.; Leigh, G.J.; Haszeldine, R.N.; Robinson, P.J.; Sedgwick, R.D.; Simmons, R.F., Bond dissociation energies in organosilicon compounds, Chem. Commun., 1966, 178. [all data]

Hess, Lampe, et al., 1964
Hess, G.G.; Lampe, F.W.; Sommer, L.H., Bond dissociation energies and ion energetics in organosilicon compounds by electron impact, J. Am. Chem. Soc., 1964, 86, 3174. [all data]

Dallos, Sisak, et al., 2000
Dallos, A.; Sisak, A.; Kulcsár, Z.; Kováts, E., Pair-wise interactions by gas chromatography VII. Interaction free enthalpies of solutes with secondary alcohol groups, J. Chromatogr. A, 2000, 904, 2, 211-242, https://doi.org/10.1016/S0021-9673(00)00908-0 . [all data]

Reddy, Dutoit, et al., 1992
Reddy, K.S.; Dutoit, J.-Cl.; Kovats, E. sz., Pair-wise interactions by gas chromatography. I. Interaction free enthalpies of solutes with non-associated primary alcohol groups, J. Chromatogr., 1992, 609, 1-2, 229-259, https://doi.org/10.1016/0021-9673(92)80167-S . [all data]

Szekely, Nefedov, et al., 1967
Szekely, T.; Nefedov, O.M.; Garzo, G.; Shiryayav, V.I.; Fritz, D., Gas chromatographic investigation of the thermal decomposition of polydimethylsilylene, Acta Chim. Acad. Sci. Hung., 1967, 54, 3-4, 241-254. [all data]


Notes

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