75261-75-5Relevant academic research and scientific papers
Electrochemical studies of monomeric niobium(V) and niobium(IV) porphyrins in nonaqueous media
Anderson,Liu,Guilard,Barbe,Kadish
, p. 3786 - 3791 (2008/10/08)
The redox properties of five monomeric Nb(V) and Nb(IV) metalloporphyrins were investigated in nonaqueous media. The compounds studied were (P)NbV(O)(L) and (P)NbIV(O) where Pis the dianion of tetraphenylporphyrin (TPP), the dianion of octaethylporphyrin (OEP), or the dianion of tetra-p-tolylporphyrin (TpTP) and L is acetate anion (O2CCH3-) or acetylacetonate anion (acac-). The investigated niobium(V) porphyrins could be reduced by up to three electrons and oxidized by one electron. Chemical reactions followed both the reduction and the oxidation of the niobium(V) complexes. The niobium(IV) porphyrins could be reduced by up to two electrons and oxidized by two electrons. Reductions of the niobium(IV) complexes were reversible, but chemical reactions followed the oxidations. Each electrode reaction was monitored by spectroelectrochemistry and ESR spectroscopy, and on the basis of these data an overall mechanism for the oxidation and reduction of monomeric Nb(V) and Nb(IV) porphyrins is presented.
