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Agntf2 Synthesis Essay


The chemistry of coinage metal bis(triflyl)imides of technological interest, CuNTf2 and AgNTf2, their synthesis and complexes with excess of comparatively weakly coordinating NTf2 as well as with ether, olefins, and the arene mesitylene are described. The existence of the solvent-free pure phase [CuNTf2] has not been evidenced so far. Contrary to the literature, in which the preparation of [CuNTf2] is supposed to be carried out by reacting mesityl copper, [Cu(Mes)]5, and HNTf2, we found that in fact this reaction leads reproducibly to the interesting copper diarene sandwich complex [Cu(η3-MesH)2][Cu(NTf2)2] (1) (MesH=1,3,5-trimethylbenzene). The unexpectedly stable molecular etherate [Cu(Et2O)(NTf2)] (2) turned out to be the best precursor for CuNTf2 having only an inert and easily exchangeable solvent ligand. The coordination mode of NTf2 in 1 and 2 as well as in the hitherto unknown crystalline phase of [AgNTf2] (3) is described. The complex formation, which takes place when dissolving 2 or 3 in the room temperature ionic liquid (RTIL) [emim]NTf2 ([emim]+=1-ethyl-3-methylimidazolium), has been studied. Furthermore, the reaction of 13 towards the diolefins 1,5-cyclooctadiene (COD), 2,5-norbornadiene (NBD) and isoprene (2-methylbuta-1,3-diene) and towards ethylene has been investigated. The products 413 of these conversions have been isolated and fully characterized by NMR- and IR spectroscopies, mass spectrometry, and elemental- and XRD analyses. The potential of [Cu(η3-MesH)2][Cu(NTf2)2] (1), [Cu(Et2O)(NTf2)] (2) and [AgNTf2] (3) as well as of [emim][M(NTf2)2] (M=Cu 4, Ag 5) as chemisorbers for ethylene was studied by NMR spectroscopy.

Он что-то говорил, но сквозь звуконепроницаемую перегородку слов не было слышно. У него был такой вид, словно он только что увидел привидение. - Какого черта здесь нужно Чатрукьяну? - недовольно поинтересовался Стратмор.  - Сегодня не его дежурство.

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