Absorption Coefficient of Acetonitrile in the Visible Spectrum

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Discussion Overview

The discussion revolves around the molar absorption coefficient of acetonitrile, specifically seeking information about its absorbance in the visible spectrum. Participants explore the feasibility of using acetonitrile for experiments related to thermodynamics and absorption properties.

Discussion Character

  • Exploratory
  • Debate/contested
  • Technical explanation

Main Points Raised

  • One participant inquires about the molar absorption coefficient of acetonitrile in the visible spectrum, indicating a need for this information for experimental purposes.
  • Another participant asserts that acetonitrile does not have an appreciable absorbance in the visible range and suggests checking a Fisher catalog for confirmation.
  • A different participant expresses a need for an alternative liquid that is immiscible in water and absorbs in the visible spectrum.
  • One participant questions the miscibility of acetonitrile in water, noting that it is completely miscible, which may affect its suitability for the intended experiments.
  • Another participant speculates that acetonitrile is UV active, implying potential absorbance outside the visible spectrum.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the absorbance characteristics of acetonitrile, with some asserting it lacks visible absorbance while others suggest it may be UV active. The discussion remains unresolved regarding suitable alternatives for the intended experiments.

Contextual Notes

There is uncertainty regarding the specific absorbance characteristics of acetonitrile, particularly in the visible spectrum, and the implications of its miscibility with water on experimental design.

Who May Find This Useful

This discussion may be of interest to researchers or students exploring solvent properties in spectrophotometry, particularly those looking for alternatives to acetonitrile for experiments involving visible light absorption.

sicjeff
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Does anyone know the molar absorption coefficient for acetonitrile? I need to know what wavelength the coefficient is at of course as well. Hopefully I can find one in the visible spectrum. My department does not have an ultra violet spectrophotometer.

I guess I should pick easier thermodynamic experiments :rolleyes:
 
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Acentonitrile does not have an appreciable visible absorbance.

Look in a Fisher catalog for the Optima grade. You will see that it has no appreciable absorbance down to 200 nm (deep in the UV!).

Absorbance (200nm) <= 0.07
 
thank you. I guess I will have to pick something else. Could anyone suggest a liquid immiscible in water that absorbs in the vis spectrum?
 
What is the solute and what, in general terms, are you trying to investigate?

BTW, acetonitrile is completely miscible in water. Good thing it didn't work out, yes?
 
i would suspect that acetonitrile is uv active
 

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