钴
CAS号：61789-51-3
品名：环烷酸钴CobaltNaphthenate
中文别名：石油酸亚钴;萘酸钴;石油酸钴;
英文别名：cobalt(2+),naphthalene-2-carboxylate;
分子式：C20H34CoO4
分子量：397.415
精确质量：397.179
Psa：80.26
EINECS号：263-064-0
外观与性状：黄色至棕色树脂质的液体
密度：0.95
熔点：140ºC
闪点：49ºC
折射率：n20/D 1.4620
储存条件：2-8ºC
安全说明：S23-S45-S53-S60-S61-S36-S37
危险类别码：R49; R10; R36/38; R42/43; R50/53; R40
包装等级：III
信号词：Danger
危险性防范说明：P210; P261; P280; P284; P301 + P310; P370 + P378
危险标志：GHS02, GHS08
危险性描述：H226; H304; H317; H334
简介：Cobalt(II)naphthenateisamixtureofcobalt(II)derivativesofnaphthenicacids.CobaltNaphthenateisacobaltsourcethatissolubleinorganicsolventsasanorganometalliccompound(alsoknownasmetalorganic,organo-inorganicandmetallo-organiccompounds).Cobaltnaphthenateisthecobaltsaltofnaphthenicacids.NaphthenicacidsareacomplexgroupofcarboxylicacidswiththegeneralformulaC,HZ~+~O~,wherenindicatesthecarbonnumberandZspecifiesthehydrogendeficiencyresultingfromringformation.Cobaltnaphthenateisthusamemberofthemetalcarboxylatesgroup.Allofthemetalcarboxylatesaltsaredesignedtoaddmetalstochemicalreactions.Theythereforeareexpectedtodissociateintofreemetalandfreeacid.Thehighpurityacetylacetonateanioncomplexesbybondingeachoxygenatomtothemetalliccationtoformachelatering.Becauseofthisproperty,CobaltNaphthenateiscommonlyusedinvariouscatalystsandcatalyticreagentsfororganicsynthesis.Thesecoordinationcomplexesarewidelyusedasoildryingagentsfortheautoxidativecrosslinkingofdryingoils.Metalnaphthenatesarenotwelldefinedinconventionalchemicalsensethattheyaremixtures.Theyarewidelyemployedcatalystsbecausetheyaresolubleinthenonpolarsubstrates,suchasthealkydresinsorlinseedoil.Thefactthatnaphthenatesaremixtureshelpstoconferhighsolubility.Asecondvirtueofthesespeciesistheirlowcost.Awell-definedcompoundthatexhibitsmanyofthepropertiesofcobaltnaphthenateisthecobalt(II)complexof2-ethylhexanoicacid.Oftenintechnicalliterature,naphthenatesaredescribedassalts,buttheyareprobablyalsonon-ioniccoordinationcomplexeswithstructuressimilartobasiczincacetate.Cobaltnaphthenateisusedprimarilyinunsaturatedpolyesterresins,paintdrierapplicationsandrubberadhesionpromotioninthetireindustry.Onecharacteristicofcobaltnaphthenateandothermetalcarboxylatesisthattheyreadilydissociatefromanionpairintofreemetalandfreeacid.Theyarefoundaspartiallydissociatedproductsintheambientenvironment(i.e.,neutralpH).DissociationisareversibleprocessandtheproportionofdissociatedsaltisdependentonthepHandpKa(thedissociationconstant),whichisthepHatwhich50%dissociationoccurs.InthelowpHenvironmentofthedigestivetract3(e.g.,pH1.2)completedissociationwilloccurforthesemetalcarboxylates.Thetransportand’bioavailabilityofthemetalsandacidsaredeterminedbytheirsolubilityinenvironmentalmediaandbiologicalfluidswhichisdeterminedbyenvironmentalparameterssuchaspH.Dissociationisareversiblereaction,splittingtheparentcompoundintotwoormorechemicalspecieswhichmaybeionic,butarenotnecessarilyso.Theprocesscanbegenerallyrepresentedas:
用途：主要用于橡胶粘合剂。
