A remarkable effect of solvents on the reaction outcome has been discovered in the synthesis of halocuprates,as exemplified by the reaction of CuI with 1-methyl-2-methylthiopyridinium iodide,(Me–PySMe)I.When performe...A remarkable effect of solvents on the reaction outcome has been discovered in the synthesis of halocuprates,as exemplified by the reaction of CuI with 1-methyl-2-methylthiopyridinium iodide,(Me–PySMe)I.When performed in acetonitrile,the reaction results in the selective self-assembly of iodocuprate(Me–PySMe)n[Cu_(2)I_(3)]_(n)(1)featuring 1D double-stranded[Cu_(2)I_(3)]_(n) ribbons.Surprisingly,upon exploiting acetone as a medium under other conditions being similar,isomeric 1D iodocuprate 2 containing one-stranded[Cu_(2)I_(3)]_(n) chains is quantitatively formed.Iodocuprate 1 displays outstanding dual luminescence expressed by two emission bands at λ_(max)=680 and 550 nm,probably originating from the excited states of the cluster-centered(^(3)CC)type and iodocuprate-to-cation charge transfer one,respectively.The resulting emission color of 1,being defined by the ratio of these bands,reversibly varies as a function of temperature spanning from deep-red(300 K)to yellow(77 K).Isomer 2,being also dual emissive,does not exhibit prominent thermochromic luminescence.展开更多
文摘A remarkable effect of solvents on the reaction outcome has been discovered in the synthesis of halocuprates,as exemplified by the reaction of CuI with 1-methyl-2-methylthiopyridinium iodide,(Me–PySMe)I.When performed in acetonitrile,the reaction results in the selective self-assembly of iodocuprate(Me–PySMe)n[Cu_(2)I_(3)]_(n)(1)featuring 1D double-stranded[Cu_(2)I_(3)]_(n) ribbons.Surprisingly,upon exploiting acetone as a medium under other conditions being similar,isomeric 1D iodocuprate 2 containing one-stranded[Cu_(2)I_(3)]_(n) chains is quantitatively formed.Iodocuprate 1 displays outstanding dual luminescence expressed by two emission bands at λ_(max)=680 and 550 nm,probably originating from the excited states of the cluster-centered(^(3)CC)type and iodocuprate-to-cation charge transfer one,respectively.The resulting emission color of 1,being defined by the ratio of these bands,reversibly varies as a function of temperature spanning from deep-red(300 K)to yellow(77 K).Isomer 2,being also dual emissive,does not exhibit prominent thermochromic luminescence.
