<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Rizvi, Masood Ahmad</style></author><author><style face="normal" font="default" size="100%">Dangat, Yuvraj B.</style></author><author><style face="normal" font="default" size="100%">Shams, Tahir</style></author><author><style face="normal" font="default" size="100%">Khan, Khaliquz Zaman</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Complexation key to a pH locked redox reaction</style></title><secondary-title><style face="normal" font="default" size="100%">Journal of Chemical Education</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">Analytical Chemistry</style></keyword><keyword><style  face="normal" font="default" size="100%">Aqueous Solution Chemistry</style></keyword><keyword><style  face="normal" font="default" size="100%">Coordination Compounds</style></keyword><keyword><style  face="normal" font="default" size="100%">Oxidation/Reduction</style></keyword><keyword><style  face="normal" font="default" size="100%">pH</style></keyword><keyword><style  face="normal" font="default" size="100%">Physical Chemistry</style></keyword><keyword><style  face="normal" font="default" size="100%">Potentiometry</style></keyword><keyword><style  face="normal" font="default" size="100%">Second-Year Undergraduate</style></keyword><keyword><style  face="normal" font="default" size="100%">Thermodynamics</style></keyword><keyword><style  face="normal" font="default" size="100%">Titration/Volumetric Analysis</style></keyword><keyword><style  face="normal" font="default" size="100%">Upper-Division Undergraduate</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2016</style></year><pub-dates><date><style  face="normal" font="default" size="100%">FEB</style></date></pub-dates></dates><number><style face="normal" font="default" size="100%">2</style></number><publisher><style face="normal" font="default" size="100%">AMER CHEMICAL SOC</style></publisher><pub-location><style face="normal" font="default" size="100%">1155 16TH ST, NW, WASHINGTON, DC 20036 USA</style></pub-location><volume><style face="normal" font="default" size="100%">93</style></volume><pages><style face="normal" font="default" size="100%">355-361</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">&lt;p&gt;An unfavorable pH can block a feasible electron transfer for a pH dependent redox reaction. In this experiment, a series of potentiometric titrations demonstrate the sequential loss in feasibility of iron(II) dichromate redox reaction over a pH range of 0-4. The pH at which this reaction failed to occur was termed as a pH locked reaction. The comparative ability of 10 selected iron binding ligands with varied propensity for the redox potential modification of Fe(III)/Fe(II) redox couple to restore/unlock the pH locked redox reaction is shown using potentiometric titrations. The spectrophotometric speciation analysis of Fe(III) Tiron complexation with pH was carried out to explain the differing ability of EDTA and Tiron to unlock the reaction under different pH Conditions. The experiment illustrates how environmental, biological redox reactions avoid severe laboratory conditions to occur and can be explored in the design of novel redox systems for natural attenuation of environmental toxins to their non- or lesser-toxic forms. The experiment also demonstrates prudent laboratory practice for safe waste disposal.&lt;/p&gt;</style></abstract><issue><style face="normal" font="default" size="100%">2</style></issue><custom3><style face="normal" font="default" size="100%">&lt;p&gt;Foreign&lt;/p&gt;</style></custom3><custom4><style face="normal" font="default" size="100%">1.225</style></custom4></record><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Rizvi, Masood Ahmad</style></author><author><style face="normal" font="default" size="100%">Mane, Manoj</style></author><author><style face="normal" font="default" size="100%">Khuroo, Mohammad Akbar</style></author><author><style face="normal" font="default" size="100%">Peerzada, Ghulam Mustafa</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Computational survey of ligand properties on iron(III)-iron(II) redox potential: exploring natural attenuation of nitroaromatic compounds</style></title><secondary-title><style face="normal" font="default" size="100%">Monatshefte Fur Chemie</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">Catechol derivatives</style></keyword><keyword><style  face="normal" font="default" size="100%">computational chemistry</style></keyword><keyword><style  face="normal" font="default" size="100%">Density functional theory</style></keyword><keyword><style  face="normal" font="default" size="100%">Iron complexes</style></keyword><keyword><style  face="normal" font="default" size="100%">Ligand effect on redox potential</style></keyword><keyword><style  face="normal" font="default" size="100%">Natural attenuation</style></keyword><keyword><style  face="normal" font="default" size="100%">Nitroaromatic compounds</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2017</style></year><pub-dates><date><style  face="normal" font="default" size="100%">APR</style></date></pub-dates></dates><volume><style face="normal" font="default" size="100%">148</style></volume><pages><style face="normal" font="default" size="100%">655-668</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">&lt;p&gt;This study is a computational investigation of the ligand effect on the redox potential of iron redox couple aimed at screening these systems for novel applications. The influence of common and naturally available organic compounds with diverse ligand characteristics (nature of donor site, chelation, pre-organization, degree of back acceptance) on the redox potential of iron(III)-iron(II) redox couple has been theoretically calculated using an appropriate level of density functional theory (DFT). The DFT calculated redox potentials of iron complexes are explored to supplement, corroborate, and predict the experimental behavior of the studied systems towards environmental reduction of nitroaromatic compounds to corresponding anilines. The comparative avidity of iron complexes with cysteine derivatives for the reduction of nitroaromatic compounds has been theoretically explored and based on structure-activity relationship; new iron complexes with a range of reactivity and enhanced ability towards nitroaromatic reduction have been predicted.&lt;/p&gt;</style></abstract><issue><style face="normal" font="default" size="100%">4</style></issue><work-type><style face="normal" font="default" size="100%">Article</style></work-type><custom3><style face="normal" font="default" size="100%">Foreign</style></custom3><custom4><style face="normal" font="default" size="100%">1.285</style></custom4></record></records></xml>