| 1453100-32-7

• 分子结构分类: 有机化合物 - 有机杂环化合物 - 异吲哚及其衍生物
• CAS: 1453100-32-7
• 化学式: C₅₀H₃₄F₄IrN₈*NO₃
• 分子量: 1077.09
• InChiKey: UAPCVZBPIINUTP-UHFFFAOYSA-N

反应信息

• 作为产物：
  描述：

  potassium nitrate 、 以 二氯甲烷 、 水 、 乙腈 为溶剂， 生成
  参考文献：
  名称：

  d→f Energy Transfer in Ir(III)/Eu(III) Dyads: Use of a Naphthyl Spacer as a Spatial and Energetic “Stepping Stone”

  摘要：

  A series of luminescent complexes based on {Ir-(phpy)(2)} (phpy = cyclometallating anion of 2-phenylpyricline) or {Ir(F(2)phpy)(2)} [F(2)phpy = cyclometallating anion of 2-(2',4'-difluorophenyl)pyridine] units, with an additional 3-(2-pyridyl)-pyrazole (pypz) ligand, have been prepared; fluorination of the phenylpyridine ligands results in a blue-shift of the usual (MLCT)-M-3/(LC)-L-3 luminescence of the Ir unit from 477 to 455 nm. These complexes have pendant from the coordinated pyrazolyl ring an additional chelating 3-(2-pyridyl)-pyrazole unit, separated via a flexible chain containing a naphthalene-1,4-diyl or naphthalene-1,5-diyl spacer. Crystal structures show that the flexibility of the pendant chain allows the naphthyl group to lie close to the Ir core and participate in a it-stacking interaction with a coordinated phpy or F(2)phpy ligand. Luminescence spectra show that, whereas the {Ir(phpy)(2)(pypz)} complexes show typical Ir-based emission-albeit with lengthened lifetimes because of interaction with the stacked naphthyl group the {Ir(F(2)phpy)(2)(pypz)} complexes are nearly quenched. This is because the higher energy of the Ir-based (MLCT)-M-3/(LC)-L-3 excited state can now be quenched by the adjacent naphthyl group to form a long-lived naphthyl-centered triplet ((3)nap) state which is detectable by transient absorption. Coordination of an {Eu(hfac)(3)} unit (hfac = 1,1,1,5,5,5-hexafluoro-pentane-2,4-dionate) to the pendant pypz binding site affords Ir-naphthyl-Eu triads. For the triads containing a {Ir(phpy)(2)} core, the unavailability of the 3nap state (not populated by the Ir-based excited state which is too low in energy) means that direct Ir -> Eu energy-transfer occurs in the same way as in other flexible Ir/Eu complexes. However for the triads based on the{Ir(F(2)phpy)(2)} core, the initial Ir-)3nap energy-transfer step is followed by a second, slower, (3)nap -> Eu energy-transfer step: transient absorption measurements clearly show the (3)nap state being sensitized by the Ir center (synchronous Jr-based decay and (3)nap rise-time) and then transferring its energy to the Eu center (synchronous (3)nap decay and Eu-based emission rise time). Thus the (3)nap state, which is energetically intermediate in the {Ir(F(2)phpy)(2)}-naphthyl-Eu systems, can act as a "stepping stone" for two-step d -> f energy-transfer.

  DOI：

  10.1021/ic401410g