Binding modes in metal ion complexes of quinones and semiquinone radical anions: electron-transfer reactivity

Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry
Junpei YuasaShunichi Fukuzumi

Abstract

9,10-Phenanthrenequinone (PQ) and 1,10-phenanthroline-5,6-dione (PTQ) form 1:1 and 2:1 complexes with metal ions (M (n+)=Sc (3+), Y (3+), Mg (2+), and Ca (2+)) in acetonitrile (MeCN), respectively. The binding constants of PQ--M (n+) complexes vary depending on either the Lewis acidity or ion radius of metal ions. The one-electron reduced species (PTQ(-)) forms 1:1 complexes with M (n+), and PQ(-) also forms 1:1 complexes with Sc(3+), Mg(2+), and Ca(2+), whereas PQ(-) forms 1:2 complexes with Y(3+) and La(3+), as indicated by electron spin resonance (ESR) measurements. On the other hand, semiquinone radical anions (Q(-) and NQ(-)) derived from p-benzoquinone (Q) and 1,4-naphthoquinone (NQ) form Sc(3+)-bridged pi-dimer radical anion complexes, Q(-)--(Sc(3+))(n)--Q and NQ(-)--(Sc(3+))(n)-NQ (n=2 and 3), respectively. The one-electron reduction potentials of quinones (PQ, PTQ, and Q) are largely positively shifted in the presence of M (n+). The rate constant of electron transfer from CoTPP (TPP(2-)=dianion of tetraphenylporphyrin) to PQ increases with increasing the concentration of Sc(3+) to reach a constant value, when all PQ molecules form the 1:1 complex with Sc(3+). Rates of electron transfer from 10,10'-dimethyl-9,9'-biacrid...Continue Reading

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Citations

Jun 6, 2012·Inorganic Chemistry·Manas Kumar BiswasPrasanta Ghosh
Feb 22, 2012·Journal of the American Chemical Society·Jiyun ParkShunichi Fukuzumi
Dec 18, 2013·Journal of the American Chemical Society·Alison E Wendlandt, Shannon S Stahl
May 19, 2012·Physical Chemistry Chemical Physics : PCCP·Shunichi FukuzumiYuma Morimoto
Jan 12, 2011·The Journal of Chemical Physics·Nasrin Mirsaleh-KohanLéon Sanche
Jul 12, 2012·The Journal of Chemical Physics·Nasrin Mirsaleh-KohanLéon Sanche
Oct 11, 2008·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Sergiy V RosokhaJay K Kochi
Mar 9, 2013·Angewandte Chemie·Zhe LiuPeter J Sadler
Apr 16, 2015·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Maciej Witwicki
Dec 18, 2008·Physical Chemistry Chemical Physics : PCCP·Sergiy V RosokhaJay K Kochi
Oct 16, 2008·Organic Letters·Hani Farran, Shmaryahu Hoz
Aug 6, 2021·Physical Chemistry Chemical Physics : PCCP·Maciej WitwickiAndrew Ozarowski
Dec 15, 2017·Environmental Science & Technology·James M BarazeshDavid L Sedlak
Nov 28, 2013·Journal of the American Chemical Society·Yang-Rae KimTaek Dong Chung
Dec 26, 2018·Journal of the American Chemical Society·Muniyandi SankaralingamWonwoo Nam

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