简介:Fivenewchloranilato-bridgedbinuclearchromium(III)complexeshavebeensynthesizedandidentifiedas[Cr2(CA)L4]-(ClO4)4[Ldenotes5-methyl-1,10-phenanthroline(Me-phen);2,9-dimethyl-1,10-phenanthroline(Me2-phen);5-chloro-1,10-phenanthroline(Cl-phen);diaminoethane(en)or1,3-diaminopropane(pn)],whereCArepresentsthedianionofchloranilicacid.Basedonelementalanalyses,molarconductivityandmagneticmomentofroom-temperaturemeasurements,andIRandelectronicspectralstudies,itisproposedthatthesecomplexeshaveCA-bridgedstructuresandconsistoftwochromium(III)ions,eachinanoctahedralenvironment.Thecomplexes[Cr2(CA)(Me-phen)4](ClO4)4(1)and[Cr2(CA)(Me2-phen)4](ClO4)4(2)werefurthercharacterizedbyvariabletemperature(4.2-300K)magneticsusceptibilitymeasurementsandtheobserveddataweresuccessfullysimulatedbytheequationbasedonthespinHamiltonianoperator,,givingtheexchangeparameterJ=-7.8cm-1for(1)andJ=-6.5cm*1for(2).Thisresult
简介:地球上最后一个人独自坐在房间里,这时,忽然响起了敲门声。“咚咚咚,咚咚咚……”急促的敲门声划破了黑沉沉的夜空,已经没有人的世界一下子笼罩在恐怖之中。屋里坐着的不是别人,正是大名鼎鼎的K博士、联合国科学委员会的首席科学家,他正在为人类的复生计划大伤脑筋呢。听到敲门声,博士不由得害怕起来:“谁在外面?找我干什么?……”一连串疑问像一条蟒蛇把他缠得很紧很紧。