Iodosilylidyne
- Formula: ISi
- Molecular weight: 154.9900
- IUPAC Standard InChI: InChI=1S/HISi/c1-2/h2H
- IUPAC Standard InChIKey: BEADMLIDEVGQBP-UHFFFAOYSA-N
- CAS Registry Number: 13841-19-5
- Chemical structure:
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Gas phase thermochemistry data
Go To: Top, Constants of diatomic molecules, References, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔfH°gas | 313.63 | kJ/mol | Review | Chase, 1998 | Data last reviewed in December, 1976 |
| Quantity | Value | Units | Method | Reference | Comment |
| S°gas,1 bar | 253.85 | J/mol*K | Review | Chase, 1998 | Data last reviewed in December, 1976 |
Gas Phase Heat Capacity (Shomate Equation)
Cp° = 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
Cp = heat capacity (J/mol*K)
H° = standard enthalpy (kJ/mol)
S° = standard entropy (J/mol*K)
t = temperature (K) / 1000.
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| Temperature (K) | 298. - 1200. | 1200. - 6000. |
|---|---|---|
| A | 48.90217 | 39.76691 |
| B | -19.02582 | -0.555238 |
| C | 12.94843 | -0.047700 |
| D | -3.085237 | 0.064392 |
| E | -0.468319 | -0.206919 |
| F | 298.2150 | 301.9459 |
| G | 315.5217 | 302.6530 |
| H | 313.6293 | 313.6293 |
| Reference | Chase, 1998 | Chase, 1998 |
| Comment | Data last reviewed in December, 1976 | Data last reviewed in December, 1976 |
Constants of diatomic molecules
Go To: Top, Gas phase thermochemistry 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: Klaus P. Huber and Gerhard H. Herzberg
Data collected through September, 1977
| Symbol | Meaning |
|---|---|
| State | electronic state and / or symmetry symbol |
| Te | minimum electronic energy (cm-1) |
| ωe | vibrational constant – first term (cm-1) |
| ωexe | vibrational constant – second term (cm-1) |
| ωeye | vibrational constant – third term (cm-1) |
| Be | rotational constant in equilibrium position (cm-1) |
| αe | rotational constant – first term (cm-1) |
| γe | rotation-vibration interaction constant (cm-1) |
| De | centrifugal distortion constant (cm-1) |
| βe | rotational constant – first term, centrifugal force (cm-1) |
| re | internuclear distance (Å) |
| Trans. | observed transition(s) corresponding to electronic state |
| ν00 | position of 0-0 band (units noted in table) |
| State | Te | ωe | ωexe | ωeye | Be | αe | γe | De | βe | re | Trans. | ν00 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Unassigned bands in the region 41500 - 43600 cm-1. | ||||||||||||
| ↳Olddershaw and Robinson, 1972 | ||||||||||||
| F | F ← X1 V | 44995 H | ||||||||||
| ↳missing citation | ||||||||||||
| (E) 1 | (E ← X) | (44104) | ||||||||||
| ↳missing citation | ||||||||||||
| D | D ← X1 V | 42859 H | ||||||||||
| ↳missing citation | ||||||||||||
| State | Te | ωe | ωexe | ωeye | Be | αe | γe | De | βe | re | Trans. | ν00 |
| C | 42711 | 486 H | 3.5 | C ← X1 V | 42772 H | |||||||
| ↳missing citation | ||||||||||||
| B 2Σ | 32380.3 | 471.7 H | 0.9 | B ← X1 V | 32434.3 H | |||||||
| ↳Oldershaw and Robinson, 1968; missing citation | ||||||||||||
| A 2Σ | 21204.9 | 208.6 H | 1.66 2 | 0.079 | 3 | A ← X1 R | 21127.2 H | |||||
| ↳missing citation | ||||||||||||
| a (4Σ1/2-) | x + 20289.7 | 275.7 H | 5.6 | [(0.118)] 4 | [(2.50)] | a ↔ X2 5 R | 20246.9 H | |||||
| ↳missing citation; missing citation | ||||||||||||
| State | Te | ωe | ωexe | ωeye | Be | αe | γe | De | βe | re | Trans. | ν00 |
| X2 2Π3/2 | x 6 | 359.0 H | 1.1 | |||||||||
| X1 2Π1/2 | 0 | 363.8 H | [(1.25)] 7 | [(2.45)] | ||||||||
Notes
| 1 | Diffuse bands, assignment uncertain. |
| 2 | ωeze = -0.0055. |
| 3 | Only the 7-0 and 8-0 bands of A ← X1 have been analyzed Billingsley, 1972, B' ~ 0.085 Billingsley, 1972. Of the six expected branches only four have been observed; R11 and Q P 21 (i.e. Ree and Pff) lines are absent. Extensive perturbations by levels of a 4Σ1/2- state; see 4. |
| 4 | As a full rotational analysis of the emission bands [called A' → X by Billingsley, 1972 and A → X by Lakshminarayana and Haranath, 1970] was not possible, the nature of the a state is not known. Billingsley, 1972 suggests that this is the same 4Σ1/2- state whose higher vibrational levels (ΔG ~ 176, B ~ 0.097) have been identified in perturbations of A 2Σ(v=7,8). |
| 5 | A much weaker system reported by Lakshminarayana and Haranath, 1970 at 650 cm-1 to the red of the main system was not confirmed by Billingsley, 1972. Transitions to or from X1 2Π1/2 have not been observed. |
| 6 | Billingsley, 1972 assumes x ~ 700 cm-1 Billingsley, 1972. Tentative assignments of weak absorption bands would give x=649 cm-1 Billingsley, 1972 or x=757 cm-1 Oldershaw and Robinson, 1968. |
| 7 | Estimated by assuming the same percentage decrease in bond length from HSiI to SiI as from HSiCl to SiCl Billingsley, 1972. The rotational analysis of the A ← X1 7-0 and 8-0 bands gives B"- |p"|/2 = 0.10987 and D"= 2.1E-7. |
| 8 | Extrapolation of the vibrational levels in A2Σ Billingsley, 1972. An upper limit of 4.02 eV follows from the predissociation in B 2Σ. |
| 9 | The bands become progressively more diffuse with increasing v' Billingsley, 1972. |
References
Go To: Top, Gas phase thermochemistry data, Constants of diatomic molecules, 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]
Olddershaw and Robinson, 1972
Olddershaw, G.A.; Robinson, K.,
Ultraviolet spectra of GeI and SiI: lower wavelength bands,
J. Mol. Spectrosc., 1972, 44, 602. [all data]
Oldershaw and Robinson, 1968
Oldershaw, G.A.; Robinson, K.,
Ultra-violet absorption spectra of GeI and SiI,
Trans. Faraday Soc., 1968, 64, 2256. [all data]
Billingsley, 1972
Billingsley, J.,
The absorption and emission spectrum of silicon monoiodide,
J. Mol. Spectrosc., 1972, 43, 3, 128-147. [all data]
Lakshminarayana and Haranath, 1970
Lakshminarayana, A.; Haranath, P.B.V.,
The emission band spectrum of silicon monoiodide,
J. Phys. B:, 1970, 3, 4, 576-579. [all data]
Notes
Go To: Top, Gas phase thermochemistry data, Constants of diatomic molecules, References
- Symbols used in this document:
S°gas,1 bar Entropy of gas at standard conditions (1 bar) ΔfH°gas Enthalpy of formation of gas at standard conditions - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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