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Electrodeposition behavior of homoleptic transition metal acetonitrile complexes interrogated with piezoelectric gravimetry

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Abstract

Homoleptic acetonitrile complexes of first-row transition metal ions are a common product of the detrimental speciation of coordination complexes and organometallic compounds. However, the electrochemical properties of such species are mostly unknown, introducing ambiguities into interpretation of electroanalytical data associated with studies of molecular electrocatalysis. Here, we have cataloged the cyclic voltammetric properties of the solvento complexes of Mn(II), Fe(II), Co(II), Ni(II), Cu(I), and Zn(II) in acetonitrile electrolyte, providing information on the cathodic electrodeposition and anodic stripping processes occuring with each ion. The electrochemical quartz crystal microbalance (EQCM) has been used to quantify these processes, as well as the rates of the in situ corrosion of electrodeposited materials by the strong organic acid dimethylforamidinium, [DMFH]+. Ex situ X-ray photoelectron spectroscopic results confirm the interpretations of the voltammetric and gravimetric data, and confirm the periodic relationship between the metals. Taken together, the results described here provide an electrochemical roadmap useful in distinguishing currents arising from homogeneous electrocatalysis from currents associated with the redox cycling of secondary heterogeneous materials.

Graphical abstract: Electrodeposition behavior of homoleptic transition metal acetonitrile complexes interrogated with piezoelectric gravimetry

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Article information


Submitted
01 Oct 2019
Accepted
17 Nov 2019
First published
18 Nov 2019

Analyst, 2020, Advance Article
Article type
Paper

Electrodeposition behavior of homoleptic transition metal acetonitrile complexes interrogated with piezoelectric gravimetry

D. J. Sconyers and J. D. Blakemore, Analyst, 2020, Advance Article , DOI: 10.1039/C9AN01952A

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