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Determine the absolute integrated intensities of characteristic infrared absorption bands across aliphatic hydrocarbons and evaluate structural group additivity.

June 1, 1950The Journal of Chemical Physics

Absolute Intensities of Characteristic Infra-Red Absorption Bands of Aliphatic Hydrocarbons

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SFS. A. FrancisIndian Institute of Management Tiruchirappalli

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Implication

Spectroscopic analysis demonstrates additive infrared absorption intensities for structural groups in aliphatic hydrocarbons, indicating independent functional group behavior.

Key Points

Determine the absolute integrated intensities of characteristic infrared absorption bands across aliphatic hydrocarbons and evaluate structural group additivity.
Measured integrated intensities for the 2900, 1460, and 1370 cm⁻¹ infrared absorption bands across twelve aliphatic hydrocarbons.
Modeled molecules as non-interacting mixtures of CH3, CH2, and CH structural groups to derive unit group intensities and carbon-hydrogen bond dipole properties.
Unit group intensities for the 2900 cm⁻¹ band were 4.41×10⁻⁷, 3.81×10⁻⁷, and 1.39×10⁻⁷ cm²/(molecule·second) for CH3, CH2, and CH groups, respectively.
Intensities for the 1460 cm⁻¹ band were 0.544×10⁻⁷ (CH3) and 0.232×10⁻⁷ (CH2), while the 1370 cm⁻¹ band was 0.394×10⁻⁷ cm²/(molecule·second) for CH3.
Calculated C–H bond dipole moments divided by equilibrium bond length ranged from approximately 0.2×10⁻¹⁸ to 0.4×10⁻¹⁸ c.g.s. units, with a dipole moment derivative of approximately −0.75×10⁻¹⁰ with respect to bond length.

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S. A. Francis (1950) studied this question.

synapsesocial.com/papers/6a7e9e6f366dd125a6c2fdfa https://doi.org/10.1063/1.1747787

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Implication

Spectroscopic analysis demonstrates additive infrared absorption intensities for structural groups in aliphatic hydrocarbons, indicating independent functional group behavior.

Absolute Intensities of Characteristic Infra-Red Absorption Bands of Aliphatic Hydrocarbons

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Member takes

Implication

Key Points

Cite This Study

Absolute Intensities of Characteristic Infra-Red Absorption Bands of Aliphatic Hydrocarbons

Discussion

Member takes

Implication

Key Points

Cite This Study

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