acs.est.8b01807

acs.est.8b01807ResponsetoCommentonTheCaseAgainstChargeTransferInteractionsinDissolvedOrganicMatterPhotophysicsInresponsetoourrecentstudyregardingtheroleofcharge-transfer(CT)interactionsindissolvedorganicmatter(DOM)photophysics,1BloughandDelVecchio2raiseconcernsabouttheuseofsolventpolarity,viscosity,andtemperaturetotestfortheprevalenceofCTinteractionsinDOM.ThistopicisofgreatsignificancetoenvironmentalchemistryandengineeringduetotheubiquityandreactivityofDOMinthesesystems.BloughandDelVecchioargueagainstthetypesofpotentialdonor−acceptorcomplexesoccurringinDOMproposedinFigure1ofMcKayetal.(2018),1whichincludesindependent,covalentlytethered,andconjugateddonor−acceptormoieties.Thecounterargument2assertsthatthetypesofdonor−acceptorcomplexesweproposeplayalimitedrole,suggestinginsteadthatthemodelforpolydopamine,asproposedbyDreyerandco-workers,3alsoappliestoDOM.Inthismodel,structuralunitscomposingDOMwouldformstaticcomplexesasaresultofH-bonding,π-stacking,andcharge-transferinteractions.3,4Itishypo