Exploring the Volatility, Phase Transitions, and Solubility Properties of Five Halogenated Benzaldehydes.

Area of Science:

• Chemical Thermodynamics
• Environmental Chemistry
• Physical Organic Chemistry

Background:

• Halogenated benzaldehydes are vital industrial chemicals.
• Limited thermodynamic data hinders environmental fate prediction.
• Accurate physical property data is essential for risk assessment.

Purpose of the Study:

• To determine key physical properties of selected halogenated benzaldehydes.
• To provide essential thermodynamic data for environmental modeling.
• To enhance understanding of the environmental behavior of these compounds.

Main Methods:

• Vapor pressure measurements using static method.
• Differential scanning calorimetry for phase transitions and heat capacity.
• Saturation shake-flask method and UV-Vis spectroscopy for water solubility.

Main Results:

• Determined standard molar enthalpies, entropies, and Gibbs energies of sublimation and vaporization.
• Measured triple points, melting temperatures, and molar enthalpies.
• Calculated Gibbs energies of hydration and Henry's law constants.

Conclusions:

• Experimental data significantly improves predictive models for melting temperature, vapor pressure, and solubility.
• Enhanced models provide valuable insights into the mobility and fate of halogenated benzaldehydes.
• Findings support improved environmental risk assessment and management strategies.