Department of Chemistry, Pohang University of Science and Technology (POSTECH), San 31, Hyoja-dong, Pohang, 790-784, Republic of Korea.
Chemistry. 2012 Aug 6;18(32):9886-93. doi: 10.1002/chem.201200726. Epub 2012 Jul 10.
Substituents can induce dramatic changes in the photoluminescence properties of N,O-chelated boron complexes. Specifically, the boron complexes of 2-(benzothiazol-2-yl)phenols become bright deep blue- and orange-red-emitting materials depending on amino substituents at the 5- and 4-positions of 2-(benzothiazol-2-yl)phenol, respectively. Absorption and emission data show that the resulting boron complexes have little or small overlap between the absorption and emission spectra and, furthermore, X-ray crystal structures for both the blue and orange-red complexes indicate the absence of π-π stacking interaction in the crystal-packing structures. These features endow the boron complexes with bright and strong photoluminescence in the solid state, which distinguishes itself from the typical boron complexes of dipyrromethenes (BODIPYs). A preliminary study indicates that the blue complexes have promising electro-optical characteristics as dopant in an organic light-emitting diode (OLED) device and show chromaticity close to an ideal deep blue. The substituent effects on the photoluminescent properties may be used to tune the desired emission wavelength of related boron or other metal complexes.
取代基可以显著改变 N,O-螯合硼配合物的光致发光性能。具体来说，2-(苯并噻唑-2-基)苯酚的硼配合物分别取决于 2-(苯并噻唑-2-基)苯酚的 5-位和 4-位上的氨基取代基，变成明亮的深蓝色和橙红色发射材料。吸收和发射数据表明，所得硼配合物在吸收和发射光谱之间几乎没有或有较小的重叠，此外，蓝色和橙红色配合物的 X 射线晶体结构表明在晶体堆积结构中不存在 π-π 堆积相互作用。这些特征赋予硼配合物在固态下具有明亮而强的光致发光，这有别于典型的二吡咯甲川（BODIPY）硼配合物。初步研究表明，蓝色配合物作为有机发光二极管（OLED）器件中的掺杂剂具有有前途的电光特性，并显示出接近理想深蓝色的色度。取代基对光致发光性质的影响可用于调节相关硼或其他金属配合物的所需发射波长。
