Photophysical Engineering of Transition Metal pi-Diborene and -Diboryne Complexes

近年来，硼元素键和硼硼多键的构建一直是布伦瑞克课课组研究的重点，其成果包括分离出含亚氨基硼基、氧硼基和烷基烯乙硼基配合物的B-N、B-O三键和B-C双键，以及合成二硼烯和二硼烯，即烯烃和炔烃的全硼类似物。在这项工作的过程中，我们能够协调二硼烯和二硼炔来制造金属中心，并发现所得到的配合物是高度发光的。二硼烯的铜(I)和银(I)配合物的荧光量子产率异常高，为0.18-0.95，寿命为几纳秒，而与三个CuCl配合的二硼烯在微秒时间尺度上表现出强烈的发光，表明其发光本质上是磷光。本项目旨在研究二硼烯和二硼烷过渡金属配合物的光物理性质。这项提议的工作代表了我们的团队带着这样的实验室好奇心进入材料科学领域的第一次尝试，探索这些基本的新型化合物，以便进一步开发它们，并使它们可用于开发光活性材料的应用。

The construction of boron-element and boron-boron multiple bonds has been a major research focus of the Braunschweig group in the last few years, culminating in the isolation of B-N and B-O triple bond and B-C double bond containing iminoboryl, oxoboryl and alkylideneboryl complexes of platinum, as well as in the synthesis of diborenes and diborynes, the all-boron analogues of alkenes and alkynes. In the course of this work we were able to coordinate diborenes and diborynes to coinage metal centers and found the resulting complexes to be highly luminescent. Whereas copper(I) and silver(I) complexes of diborenes exhibit fluorescence in unusually high quantum yields of 0.18-0.95 with lifetimes of a few nanoseconds, a diboryne with three CuCl coordinated to it shows intense emission on the microsecond timescale, indicating the luminescence to be phosphorescence in nature.This project aims at the investigation and understanding of the photophysical properties of diborene and diboryne transition metal complexes. The proposed work represents the first foray of our groups with such lab curiosities into the field of materials science, exploring these fundamentally new classes of compounds in order to develop them further and make them available for applications which exploit photoactive materials.