“Organic Aqua Regia”—Powerful Liquids for Dissolving Noble.pdf

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1、AngewandteChemieDOI:10.1002/anie.201001244Solvolysis“OrganicAquaRegia”—PowerfulLiquidsforDissolvingNobleMetals**WeiLin,*Rong-WeiZhang,Seung-SoonJang,Ching-PingWong,*andJung-IlHongThedissolutionofnoblemetalsisimportantformetallurgy,inorganicacidsresultsinthedisso

2、lutionofothernoblemetalscatalysis,organometallicchemistry,synthesesandapplica-suchasAg,Au,andPdatthesametimeasPt.Thislackoftionsofnoble-metalnanoparticles,andrecyclingofnobleselectivitylimitsthequalityoftherecycledPt.Therefore,anmetals.Aquaregia(“royalwater”)has

3、beenusedforimprovedrouteforPtrecycling—bothintermsofqualityandcenturiesasapowerfuletchanttodissolvenoblemetals.efficiency—requiresaselectivedissolutionprocess,whichThebeautyofaquaregiaisthatthesimple1:3mixtureofwouldremovethenoblemetalimpurities(Ag,Au,Pd,etc.)co

4、ncentratednitricandhydrochloricacidscandissolvenoblebeforethefinaldissolutionofPt.Preliminaryinvestigationsmetalssuchasgold,palladium,andplatinum,althoughtheseonafewnon-aqueoussolutionsfordissolvingnoblemetals[8–11]metalsarenotsolubleineitheroftheacidsalone.Wesh

5、owhavebeencarriedout,buttheyshowedunsatisfactory[9–12][9–12][8,10][11]thatsimplemixturesofthionylchloride(SOCl2)andsomesolubility,selectivity,efficiency,stability,and[8–10]organicsolvents/reagents(pyridine,N,N-dimethylformamide,simplicity.Theseetchantsarenotidea

6、lbecauseoftheandimidazole)canalsodissolvenoblemetalswithhighintrinsicinorganicchemistryassociatedwithconventional[8,9,11]dissolutionratesundermildconditions.Wenametheseoxidizersofnoblemetals(halogensandoxygen).Organ-[1]mixtures“organicusliquorregius”.Thediscover

7、yofthisicusliquorregiusoxidizesnoblemetalsbyadifferentsolventsystemisofunprecedentedscientificsignificanceandmechanism.engineeringvalue:Comparedwithinorganicchemistry,Figure1showsagraphofthedissolutionofnoblemetalsorganicchemistryprovidesprecisecontroloverchemic

8、alina3:1(v/v)mixtureofSOCl2andpyridine(py).Themixture21reactivity,andtheabilitytotailororganicreactionsenablesdissolvesgoldatarateof0.3molmhatroomtemper-theselectiv