一种新型希夫碱硼配合物的合成及表征

有机电致发光器件(OLED)已成为平板显示、照明等领域的研究热点。针对已报道的蓝光材料相对短缺,合成了一种新型希夫碱硼配合物蓝光发射材料,其可由N,N′-二(2-羟基-3-甲氧基苯甲醛)缩乙二胺(HMOB)₂en]与醋酸硼B(Ac)₃在苯溶剂中反应制得。通过¹H NMR,¹³C NMR和红外光谱确定了其结构,并对其紫外-可见吸收光谱和荧光光谱进行了研究。¹H NMR、¹³C NMR和红外光谱表明该配合物是一种以B(MOB)₂en]Ac分子形式存在的配合物。B(MOB)₂en]Ac的发光与B的引入有关,B的引入增强了分子的刚性、减少了非辐射跃迁能量损失,最终得到一种较强的蓝绿光发光材料。该材料发射的峰值波长为485nm,半峰全宽为87nm,CIE坐标:x=0.2211,y=0.4172,其最佳激发峰波长为378nm。

Synthesis and Characterization of a new Schiff Base Boron Complex

Organic electroluminescent device has become a study hotspot in flat panel display and illuminance fields. In this technology, the design and synthesis of materials are the core, studies on their properties in relation to organic electroluminescence are critical. Schiff base complexes have attracted much attention recently due to their potential application in electroluminescent displays,since the first report on Schiff bases metal complexes organic light-emitting devices (OLEDs) in 1993. Salicylaldehyde has been acted as an usually used reactant in this type of materials. It’s well-known that if an electron-donating group is introduced into a conjugated structure, the photoluminescence efficiency can be enhanced significantly, so a modified method of preparing Schiff bases was used here by the introduction of —OCH₃ to starting material salicylaldehyde. On the other hand, much effort has been devoted to the design and synthesis of boron-containing compounds for their potential applications in functional materials, including OLEDs. Boron is strongly electrophilic by virtue of its tendency to fill the vacant orbital and form 8-coordinated complex, so in contrast to other organometallic compounds, organoboron compounds are in general more stable owing to the increased covalency of B—O and B—N bonds. In this paper, a new Schiff base organoboron complex as an organic electroluminescence material was synthesized by the reaction of ethylenediamine o-vanillin Schiff base (HMOB)₂en N,N′-bis(2-hydroxy-3-methoxybenzaldehyde) ethylenediamine] and B(Ac)₃ in absolute toluene. It was characterized by ¹H NMR, ¹³C NMR and infrared absorption. Photoluminescence and ultraviolet-visible absorption spectra analysis were also conducted. ¹H NMR, ¹³C NMR and infrared absorption spectra indicate that the complex is a complex with the molecular formula of B(MOB)₂en]Ac. The luminescence of B(MOB)₂en]Ac was realized by the introduction of B, which strengthened the rigidity of the molecule and decreased the non-radiation transition, finally gave a strong blueish-green-emitting luminescent emission. The peak position of light-emitting is at 485 nm, with a FWHM (Full Width at Half Maximum) of 87 nm, CIE coordinates x=0.2211 and y=0.4172. The optimum excitation wavelength is 378 nm.