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ID:16311740
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时间:2018-08-09
《缩二脲钴配合物的合成、表征与热分解(英文)[权威资料]》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、缩二脲钴配合物的合成、表征与热分解(英文) 摘要在甲醇溶液中,以乙酸钴、氯化钴、硝酸钴和缩二脲为原料合成了3种结构不同的缩二脲钴配合物.通过元素分析、红外光谱、X射线粉末衍射和热分析对产物进行了表征,其化学组成为[Co(bi)2(H2O)2](Ac)2・H2O(1),[Co(bi)2Cl2](2)和[Co(bi)3](NO3)2・2.5H2O(3)(bi=NH2CONHCONH2).配合物1中每个Co2+与2个缩二脲分子中的4个羰基氧原子和2个水分子中的氧原子配位,配合物2中每个Co2+与2个缩二脲分子中
2、的4个羰基氧原子和2个氯原子配位,而配合物3中每个Co2+与6个全部来自缩二脲分子的羰基氧原子配位,均形成了配位数为6的配合物.配合物1和3的热分解过程包括失水和配体的分解,而配合物2的热分解过程只是配体的分解过程,最后完全分解形成氧化钴. 关键词缩二脲;钴配合物;表征;热分解 Biuretisakindofimportantchelatingligand,andcanactasanO,O′bidentateneutralligandorN,N′bidentateanionicligandbinding
3、tometalions,suchasscandium(Ⅲ)[1],copper(Ⅱ)[2],samarium(Ⅲ)[3],thorium(IV)[4]andsoon.Inrecentyearsthechemistryofbiuretandrelatedcompoundsattractsincreasingattention.Anovelbiscyclometalatedcomplexnamed[Ir2(mbiuretatoN,N′:O,O′)(ptpy)4]wasobtainedandstudied[5].
4、Whatsmore,aresearchinthermaldegradationkineticsofbiuretformaldehydepolymericligandwasdonelately[6].Inanimalhusbandry,biuretisanexcellentfeedadditiveforruminants,ithastheadvantagesofgoodpalatability,lowtoxicityandeasytodigest,andissaferthanothernonproteinni
5、trogenfeedadditives,suchasurea.Inmedicine,biuretcanbeusedforthepreparationofhypnoticsandsedativesanditisalsogoodatloweringthebloodpressure.Inchemicalindustry,biuretcanbeutilizedasrawmaterialsforsynthesisofpaints,lubricants,andcoatings.Athome,thecomplexesof
6、biuretligandhavebeenrarelyreported[79],especiallyinthecomparisonofdifferentanionsinthesynthesisofCo(Ⅱ)complexes.Thebiuretcomplexesoftraceelementsasfeedadditivesforruminantscanplayadualroleofessentialtraceelementsandnonproteinnitrogennutritionsupplements.He
7、rewereportthreeCo(Ⅱ)complexessynthesizedwithbiuretandthreedifferentcobaltsalts. 1Experimental 1.1Materialsandphysicalmeasurements Allchemicalspurchasedwereofanalyticalreagentgradeandusedwithoutfurtherpurification.Cobaltacetatetetrahydrate,cobaltchloride
8、hexahydrate,cobaltnitratehexahydrateandbiuretwerepurchasedfromSinopharmChemicalReagentCo.Ltd.ofShanghai. ElementalanalysesforC,HandNinthecomplexesweremeasuredonaVarioELCUBEelementalanalyzer,andthecontentofco
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