ESR Lab Activity

Introduction

We are going to collect an ESR spectrum from a series of substituted hydroquinones.

A=Hydroquinone (110.11 g/mol)

B=methylhydroquinone (124.14 g/mol)

C=2,3-dimethylhydroquinone (138.16 g/mol)

(enter a table here with information, molar mass, sigma product number, cost)

Name	Molar Mass	Sigma Product Number	Cost
Hydroquinone	110.11 g/mol	H9003	22.90 / 100g
Methylhydroquinone	124.14 g/mol	112968	59.20 / 250g
2,3-dimethylhydroquinone	138.16 g/mol	300756	118.00 / 5g

Experimental

Beaker Method

• Solution A: 1 M NaOH; 1 gram NaOH (39.997 g/mol) into 25 mL EtOH.
• Solution B: 1 M hydroquinone solution.
• Procedure: To 2 ml of 1 M hydroquinone solution add 2-3 drops of solution A. A color change will indicate the reaction has occurred. Quickly transfer colored sample to ESR sample tube, place in ESR spectrometer, tune, and collected data.

Flow Method

• Solution A: 0.05 M NaOH; 0.05 grams NaOH (39.997 g/mol) into 25 ml EtOH.
• Solution B: 1 M hydroquinone solution.
• Procedure: Prepare two syringed with