Journal
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
Volume 2022, Issue 8, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ejic.202101059
Keywords
Electrochemistry; Ferrocenyl beta-ketoamines; SolidState structure; Spectroelectrochemistry
Categories
Funding
- Deutsche Akademische Austauschdienst (DAAD)
- Croatian Ministry of Science and Education
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The reaction between FcC(O)CH=C(OH)R and 1-H2N-4-R'-C6H4 produces β-ketoamines, and their reversible redox processes are determined through electrochemical studies. Electrostatic interactions between Fc/[Fc](+) during oxidation are confirmed by UV/vis-NIR spectroscopy. A linear relationship between s Hammett constants and reversible redox processes is observed.
FcC(O)CH=C(OH)R (1, R= Me; 2, R= Fc; Fc= Fe(eta(5)-C5H4)(eta(5)-C5H5)) reacts with 1-H2N-4-R'-C6H4 (3a, R'= Me; 3b, R`= OMe; 3c, R'= C.N; 3d, R'= F) producing beta-ketoamines FcC(O)CH=C(NH(C6H4-4-R'))R (4a-d, R= Me; 5a-d, R= Fc). Electrochemistry shows that 4a-d possess one (4a: E degrees'= 90 mV; 4b: E degrees'= 80 mV; 4c: E degrees'= 145 mV; 4d: E degrees'= 95 mV) and 5a-d two (5a: E degrees' 1,2= 90, 305 mV; 5b: E degrees' 1,2= 85, 305 mV; 5c: E degrees' 1,2= 155, 360 mV; 5d: E degrees' 1,2= 105, 325 mV) reversible redox processes. In 5a-d electrostatic interactions occur among Fc/[Fc](+) as oxidation progresses, as evidenced by UV/vis-NIR spectroscopy. Compounds 4a,d and 5b,c display an irreversible N-oxidation at 1100-1450 mV, while 4b owns a reversible event at 910 mV. A linear relationship between the s Hammett constants and the E degrees' 1 values exists.
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