Potassium hexacyanoferrate 3

Manufactured by Thermo Fisher Scientific

Sourced in Germany

Potassium hexacyanoferrate(III) is a chemical compound with the formula K3[Fe(CN)6]. It is a crystalline, yellow-to-orange solid that is soluble in water. The compound consists of a central iron(III) ion coordinated by six cyanide ligands, which form a stable, octahedral complex. Potassium hexacyanoferrate(III) is commonly used as a calibration standard and analytical reagent in various laboratory applications.

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3 protocols using potassium hexacyanoferrate 3

Reagent Preparation for Analytical Experiments

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L-ascorbic acid (99.0%), nickel(II) acetate tetrahydrate (99.0%), trisodium citrate (≥99.0%), rhodamine-B (≥95.0%) and 4,4′-Isopropylidendiphenol (≥99.0%; bisphenol-A) were purchased from Sigma Aldrich (Taufkirchen, Germany). Potassium hexacyanoferrate(III) (98.0%) and tetramethylammonium hydroxide pentahydrate (98%) were purchased from Alfa Aesar (Kandel, Germany). Potassium peroxymonosulfate triple salt (PMS) and tert-butanol (99.0%) were purchased from Merck (Taufkirchen, Germany). Methanol (99.9%) was purchased from Carl Roth (Fontenay-sous-Bois, France)). Ethanol absolute (≥99.8%) was purchased from VWR (Fontenay-sous-Bois, France). All aqueous solutions and dispersions were prepared by using deionized Milli-Q water (18.2 mΩ cm⁻¹) obtained from a Milli-Q Direct-8 system.

Keßler S., Reinalter E.R., Schmidt J, & Cölfen H. (2021). Environmentally Benign Formation of Nickel Hexacyanoferrate-Derived Mesoframes for Heterogeneous Catalysis. Nanomaterials, 11(10), 2756.

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Quantification of Neurotransmitters and Metabolites

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Chemicals 3-Mercaptopropionic acid (MPA), DA hydrochloride (DA•HCl), L-DOPA, L-DOPA-( phenyl-d 3 ), DOPAC, γ-aminobutyric acid (GABA), (-)-epinephrine, (-)-norepinephrine, L-ascorbic acid (AA), KNO 3 , Na 2 S 2 O 5 , EDTA and H 2 O 2 were bought from Sigma-Aldrich (Austria). Potassium hexacyanoferrate(II) trihydrate was bought from Fluka, potassium hexacyanoferrate (III) was bought from Alfa Aesar. KOH was bought from Lachema, absolute ethanol was bought from CL Chemlab. Formic acid LC-MS grade and acetonitrile LC-MS grade were bought from Merck. DI water (18.2 MΩ cm -1 ) was obtained with a Simplicity UV water purification system (Merck). Phosphate Buffer Saline (PBS) 10X was bought from VWR.

Zanetti C ., Spitz S ., Berger E ., Bolognin S ., Smits LM ., Crepaz P ., Rothbauer M ., Rosser JM ., Marchetti-Deschmann M ., Schwamborn JC , & Ertl P . (2021). Monitoring the neurotransmitter release of human midbrain organoids using a redox cycling microsensor as a novel tool for personalized Parkinson's disease modelling and drug screening. The Analyst, 146(7).

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Preparation of Redox Electrolytes for Electrochemical Studies

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The [Fe(CN) 6 ] 3À/4À electrolyte was prepared from deionized water (Millipore, 418.2 MO cm), deuterium oxide (99.9% atom% D, Aldrich), potassium hexacyanoferrate(III) (499%, Alfa Aesar) and potassium hexacyanoferrate(II) trihydrate (99.5%, Sigma). Iron(III) chloride hexahydrate (498%, Sigma-Aldrich) and iron(II) chloride tetrahydrate (98%, Sigma-Aldrich) were used for the preparation of the [Fe(H 2 O) 6 ] 3+/2+ electrolyte. For cation dependent measurements, tetrabutylammonium chloride (TBACl, 498%, Sigma-Aldrich), tetraethylammonium chloride (TEACl 498%, Sigma-Aldrich), tetramethylammonium chloride (TMACl 498%, Sigma-Aldrich), lithium chloride (498%, Alfa Aesar), sodium chloride (99.99%, Alfa Aesar), potassium chloride (99.995%, Alfa Aesar), rubidium chloride (99.8%, Alfa Aesar), cesium chloride (99.9%, Alfa Aesar), lithium perchlorate (495%, Sigma-Aldrich), potassium perchlorate, sodium perchlorate (499%, Alfa Aesar), lithium nitrate (99%, Alfa Aesar), potassium nitrate (99%, Alfa Aesar), rubidium nitrate (99.7%, Sigma-Aldrich) and cesium nitrate (99.99%, Sigma-Aldrich) were used. Furthermore, both [Fe(CN) 6 ] 3À/4À and [Fe(H 2 O) 6 ] 3+/2+ redox couples were stable in the presence of perchlorate salts, as shown in the cyclic voltammograms (ESI2, †). This journal is © the Owner Societies 2018

Huang B., Muy S., Feng S., Katayama Y., Lu Y.C., Chen G, & Shao-Horn Y. (2018). Non-covalent interactions in electrochemical reactions and implications in clean energy applications. Physical chemistry chemical physics : PCCP, 20(23).

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