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1、2854Inorg.Chem.1980,19,2854-2855chloromanganatesystems,sincethetetrachloroferratesaltslayercouplingbecauseofthecationiccharacteroftheguestareknowntoundergotransitionssimilartothetetrachloro-species.Anisotropyinthe2-DHamiltonianisthusrevealed,manganates,butathighertemperature(87K).withtheOccur
2、renceofweakferromagnetismasaconsequence.ConclusionThisworkhasshownthatMnPS3behavesasatwo-di-RegistryNo.MnPS3,43000-56-2;I,74346-92-2;11,74346-93-3;mensionalantiferromagnet.Intercalationreducestheintra-111,74346-94-4;IV,14346-95-5.CorrespondenceFerroceneasanInternalStandardforElectrochemicalMe
3、asurementsSir:Electrochemistryisanincreasinglypopulartechniqueforthecharacterizationofnewcompounds.Thebasicthermo-dynamicquantitythatisassignedtoanelectrodeprocessisthestandardorformalreductionpotential(EoorEf).Inaqueoussolutionthemeasurementofreductionpotentialsisfacilitatedbytheuseofreliabl
4、eanduniversallyacceptedreferenceelectrodessuchasthenormalhydrogenelectrode(“E)orthesaturatedcalomelelectrode(SCE).’Inmanyinstanceselectrochemicalmeasurementsinwaterareimpos-sibleduetoinsolubilityorinstabilityofthecompound.Un-fortunately,nouniversalreferenceelectrodeexistsfornona-queoussolvent
5、~.~JSinceavarietyofreferenceelectrodesystemshavebeenemployed,theliteraturecontainsnumerousreductionpotentialswhichcannotberelatedtoeachotherandwhichare,occa-sionally,difficulttoreproduce.Forexample,twocommonmethodsforreportingnonaqueouspotentialsarevs.theSCEwhichinevitablyincludesunknownliqui
6、djunctionpotentials2andvs.pseudoreferenceelectrodessuchasasilverwire.We,,,,I,,Y,‘8,1’,,,,I,,,,,believethatthesituationdescribedaboveneednotexist,and-6-14-12-10-oa-06-c4-02o02040608IOIL1416E(volts)onthebasisppfconceptsanddataalreadyintheliterature,wesuggestasimplemethodforreportingreductionpot
7、entialsinFigure1.Platinumbuttoncyclicvoltammetryat50mV/sof0.005nonaqueoussolvents.MRu(acac),inCH3CNwith0.1Mtetrabutylammoniumperchlorate:InternalStandard.Duringthecourseofourstudiesofb,c,andd,ferroceneadded;aandb,vs.Ag/AgN03(0.01M),TBAP(0.1M)
