Ruthenium hexamine reversible cyclic voltagram¶

Ruthenium hexamine Ru(NH₃)₆ is a well-known reversible redox couple.

An example voltammogram of this redox couple is demonstrated in the Pine electrode literature.

Hexaammineruthenium(III) chloride is readily available from Sigma-Aldrich (Cat # 262005). A 250 mg sample size is plenty of material for most experiments. We have repeated this experiment using the CheapStat and a screen printed carbon electrode as described below.

Reagents & Equipment¶

CheapStat with adapter ver A
Pine screen printed carbon electrode
0.1M KCl solution in distilled or deionized water [1]
Hexaammineruthenium(III) chloride [2]
Micropipettes
Microcentrifuge tubes
Deionized or distilled water

Cyclic voltammetry parameters¶

Start: -500 mV
Stop: 300 mV
Slope: 50 mV/sec
Sample rate: 3 mV/sample
Cycles: 3

Method¶

Prepare a stock solution of 10mM Ru(NH₃)₆ in 0.1M KCl as follows:
- Add 4 mL of 0.1M KCl to the bottle containing 250mg of 10mM Ru(NH₃)₆. Mix until dissolved.
- Add 50uL of the 0.2M stock solution to 1mL of 0.1M KCl in a microcentrifuge tube
Connect the screen printed adapter ver A to the CheapStat and insert a screen printed electrode
Pipette 50 uL of 0.1M KCl onto the screen printed electrode
Take a background reading
Next, pipette 50 uL of 10 mM Ru(NH₃)₆ onto the screen printed electrode and repeat measurement.

Sample data¶

Background data shown in red¶

Red = Background (0.1 mM KCl);
Cyan = 10 mM Ru(NH₃)₆ in 0.1M KCl.

Footnotes

[1]	To prepare 500 mL of a 0.1M KCl solution: transfer 33 mL of 3M KCl stock (LabChem Part # LC18795-1) into a 500 mL volumetric flask. Fill to line with distilled or deionized water. Place stopper in flask and invert several times to mix.

[2]	Sigma-Aldrich (http://www.sigmaaldrich.com/united-states.html) Part # 262005-250MG Cost $44 + shipping

IO Rodeo Documentation for CheapStat

Ruthenium hexamine reversible cyclic voltagram