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首页> 外文期刊>Chemistry: A European journal >Structural, photophysical, and electrophosphorescent properties of platinum(II) complexes supported by tetradentate N2O2 chelates
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Structural, photophysical, and electrophosphorescent properties of platinum(II) complexes supported by tetradentate N2O2 chelates

机译：四齿N2O2螯合物支持的铂（II）配合物的结构，光物理和电致磷光性能

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摘要

We present an examination of the structural and photophysical characteristics of [Pt(N2O2)] complexes bearing bis(phenoxy)diimine auxiliaries (diimine = 4,7-Ph(2)phen (1) and 4,4'-tBu(2)bpy (2)) that are tetradentate relatives of the quinolinolato (q) ligand. These neutral derivatives display high thermal stability (> 400degreesC in N-2). While the crystal lattice in 1 consists of (head-to-tail)-interacting dimers, molecules of 2 are arranged into infinitely stacked planar sheets with possible pi-pi interactions but no close (PtPt)-Pt-... contacts. Complexes 1 and 2 exhibit moderately intense low-energy UV/Nis absorptions around A=400-500nm that undergo negative solvatochromic shifts. Both derivatives are highly luminescent in solution at 298 K with emission lifetimes in the mus range, and mixed (3)[1 --> pi *(diimine)] (1 = lone pair/phenoxide) and (3)[Pt(d) --> pi*(diimine)] charge-transfer states are tentatively assigned. The excited-state properties of 2 are also investigated by time-resolved absorption spectroscopy and by quenching experiments with pyridinium acceptors to estimate the excited-state redox potential. These emitters have been employed as electrophosphorescent dopants in multilayer OLEDs. Differences between the brightness, color, and overall performance of devices incorporating 1 and 2 are attributed to the influence of the diimine substituents. [References: 52]
机译：我们目前对具有双（苯氧基）二亚胺助剂（二亚胺= 4,7-Ph（2）phen（1）和4,4'-tBu（2）的[Pt（N2O2）]配合物的结构和光物理特性进行了检查bpy（2））是喹啉酸酯（q）配体的四齿亲戚。这些中性衍生物显示出高的热稳定性（在N-2中> 400℃）。虽然1中的晶格由（头到尾）相互作用的二聚体组成，但2的分子却排列成无限可能具有pi-pi相互作用但没有紧密（PtPt）-Pt -...接触的平面薄片。配合物1和2在A = 400-500nm处表现出中等强度的低能量UV / Nis吸收，经历负的溶剂化变色。两种衍生物在298 K的溶液中均具有高发光性，发射寿命在mus范围内，并且混合了（3）[1-> pi *（diimine）]（1 =孤对/酚盐）和（3）[Pt（d ）-> pi *（diimine）]暂定电荷转移状态。还通过时间分辨吸收光谱和吡啶鎓受体的猝灭实验研究了2的激发态性质，以估计激发态的氧化还原电位。这些发射极已经用作多层OLED中的电致磷光掺杂剂。包含1和2的设备的亮度，颜色和整体性能之间的差异归因于二亚胺取代基的影响。 [参考：52]

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