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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Green to blue-green-emitting cationic iridium complexes with a CF3-substituted phenyl-triazole type cyclometalating ligand: synthesis, characterization and their use for efficient light-emitting electrochemical cells
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Green to blue-green-emitting cationic iridium complexes with a CF3-substituted phenyl-triazole type cyclometalating ligand: synthesis, characterization and their use for efficient light-emitting electrochemical cells

机译：用CF3取代的苯基 - 三唑型环荷环化配体：合成，表征及其用于高效发光电化学电池的用途的绿色

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摘要

Green to blue-green-emitting cationic iridium complexes free of sp(2) C-F bonds, namely [Ir(CF3-dPhTAZ)(2)(bpy)]PF6 (1), [Ir(CF3-dPhTAZ)(2)(dmebpy)]PF6 (2) and [Ir(CF3-dPhTAZ)(2)(phpyim)]PF6 (3), have been designed and synthesized with 3,4-diphenyl-5-(trifluoromethyl)-4H-1,2,4-triazole (CF3-dPhTAZ) as the cyclometalating ligand (C^N) and 2,2'-bipyridine (bpy), 4,4'-dimethyl-2,2'-bipyridine (dmebpy) or 2-(1-phenyl-1H-imidazol-2-yl)pyridine (phpyim) as the ancillary ligand (N^N). In CH3CN solution, complexes 1-3 afford green to blue-green emission centered at 521, 508 and 498 nm, respectively. The electron-withdrawing CF3 group attached at the triazole ring in CF3-dPhTAZ largely blue-shifts (by over 20 nm) the emission of the complex through stabilizing the highest occupied molecular orbital. In doped films, the complexes afford sky-blue emission with near-unity phosphorescent efficiencies. In neat films, the complexes show largely suppressed phosphorescence concentration-quenching, with phosphorescent efficiencies of up to 0.66. Theoretical calculations reveal that the emission of the complexes can arise from either charge-transfer (Ir -> C^N/C^N -> N^N) or C^N/N^N-centered (3)pi-pi* states, depending on the local environment of the complexes. Solid-state light-emitting electrochemical cells (LECs) based on the complexes afford green to blue-green electroluminescence centered at 525, 517 and 509 nm, respectively, with high current efficiencies of up to 35.1 cd A(-1). The work reveals that CF3-dPhTAZ is a promising C^N ligand free of sp(2) C-F bonds for constructing efficient cationic iridium complexes with blue-shifted emission.
机译：以3,4-二苯基-5-（三氟甲基）-4H-1,2,4-三氮唑（CF3-dPhTAZ）和2,2'-联吡啶（bpy）为环金属化配体，设计并合成了不含sp（2）C-F键的绿色到蓝绿色发光的阳离子铱配合物，即[Ir（CF3-dPhTAZ）（2）（bpy）]PF6（1），[Ir（CF3-dPhTAZ）（2）（dmebpy）]PF6（3），4,4'-二甲基-2,2'-联吡啶（dmebpy）或2-（1-苯基-1H-咪唑-2-基）吡啶（phpyim）作为辅助配体（N^N）。在CH3CN溶液中，配合物1-3分别在521、508和498 nm处提供绿色到蓝绿色发射。在CF3-dPhTAZ中，三唑环上的吸电子CF3基团通过稳定最高占据分子轨道，使配合物的发射大大蓝移（超过20 nm）。在掺杂薄膜中，配合物提供了近单位磷光效率的天蓝色发射。在纯膜中，配合物表现出很大程度上被抑制的磷光浓度猝灭，磷光效率高达0.66。理论计算表明，配合物的发射可以由电荷转移（Ir->C^N/C^N->N^N）或C^N/N<^N中心（3）π-π*态引起，具体取决于配合物的局部环境。基于这些配合物的固态发光电化学电池（LEC）可分别在525、517和509 nm处提供绿色到蓝绿色的电致发光，高电流效率高达35.1 cd A（-1）。研究表明，CF3-dPhTAZ是一种很有前途的不含sp（2）C-F键的C<^N配体，用于构建具有蓝移发射的高效阳离子铱配合物。

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  • 作者

    Yu Renyou; Song Yongjun; Chen Mengzhen; He Lei;

  • 作者单位

    Cent China Normal Univ Coll Chem Hubei Int Sci &

    Technol Cooperat Base Pesticide &

    Key Lab Pesticide &

    Chem Biol Minist Educ Wuhan 430079 Peoples R China;

    Cent China Normal Univ Coll Chem Hubei Int Sci &

    Technol Cooperat Base Pesticide &

    Key Lab Pesticide &

    Chem Biol Minist Educ Wuhan 430079 Peoples R China;

    Cent China Normal Univ Coll Chem Hubei Int Sci &

    Technol Cooperat Base Pesticide &

    Key Lab Pesticide &

    Chem Biol Minist Educ Wuhan 430079 Peoples R China;

    Cent China Normal Univ Coll Chem Hubei Int Sci &

    Technol Cooperat Base Pesticide &

    Key Lab Pesticide &

    Chem Biol Minist Educ Wuhan 430079 Peoples R China;

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  • 正文语种 eng
  • 中图分类 化学;无机化学;
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