Dimethyltetraphenylcyclotrisiloxane

Formula: C₂₆H₂₆O₃Si₃
Molecular weight: 470.7393
IUPAC Standard InChI: InChI=1S/C26H26O3Si3/c1-30(2)27-31(23-15-7-3-8-16-23,24-17-9-4-10-18-24)29-32(28-30,25-19-11-5-12-20-25)26-21-13-6-14-22-26/h3-22H,1-2H3
IUPAC Standard InChIKey: QLEMFNDSSPDDRW-UHFFFAOYSA-N
CAS Registry Number: 1438-86-4
Chemical structure:
This structure is also available as a 2d Mol file
Species with the same structure:
- 2,2-dimethyl-4,4,6,6-tetraphenyl-[1,3,5,2,4,6]cyclotrisiloxane
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Condensed phase thermochemistry data

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

Quantity	Value	Units	Method	Reference	Comment
S°_{solid,1 bar}	150.6	cal/mol*K	N/A	Kuliev, Dzhafarov, et al., 1982

Constant pressure heat capacity of solid

C_p,solid (cal/mol*K)	Temperature (K)	Reference	Comment
136.6	298.15	Kuliev, Dzhafarov, et al., 1982	T = 4.7 to 300 K. Data given graphically except for data at 298.15 K.

Phase change data

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Data compiled as indicated in comments:
TRC - Thermodynamics Research Center, NIST Boulder Laboratories, Chris Muzny director
AC - William E. Acree, Jr., James S. Chickos
DH - Eugene S. Domalski and Elizabeth D. Hearing

Quantity	Value	Units	Method	Reference	Comment
T_triple	361.06	K	N/A	Kuliev, Dzhafarov, et al., 1982, 2	Crystal phase 1 phase; Uncertainty assigned by TRC = 0.02 K; TRC

Enthalpy of fusion

Δ_fusH (kcal/mol)	Temperature (K)	Reference	Comment
6.74	361.1	Domalski and Hearing, 1996	AC

Enthalpy of phase transition

ΔH_trs (kcal/mol)	Temperature (K)	Initial Phase	Final Phase	Reference	Comment
6.7400	361.06	crystaline, I	liquid	Kuliev, Dzhafarov, et al., 1982	DH

Entropy of phase transition

ΔS_trs (cal/mol*K)	Temperature (K)	Initial Phase	Final Phase	Reference	Comment
18.7	361.06	crystaline, I	liquid	Kuliev, Dzhafarov, et al., 1982	DH

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:

References

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Kuliev, Dzhafarov, et al., 1982
Kuliev, A.M.; Dzhafarov, O.I.; Karasharli, K.A.; Kostryukov, V.N., Heat capacity and thermodynamic functions of cyclic methylphenylsiloxanes, Zhur. Fiz. Khim., 1982, 56, 310-313. [all data]

Kuliev, Dzhafarov, et al., 1982, 2
Kuliev, A.M.; Dzhafarov, O.I.; Karasharli, K.A.; Kostryukov, V.N., Heat capacity and thermodynamic functions of cyclic methylphenylsiloxanes, Zh. Fiz. Khim., 1982, 56, 310-13. [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]

Notes

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Symbols used in this document:

C_p,solid	Constant pressure heat capacity of solid
S°_{solid,1 bar}	Entropy of solid at standard conditions (1 bar)
T_triple	Triple point temperature
ΔH_trs	Enthalpy of phase transition
ΔS_trs	Entropy of phase transition
Δ_fusH	Enthalpy of fusion

Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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