Photoelectron spectroscopy combined with quantum chemistry has been a powerful approach to elucidate the structures and bonding of size-selected boron clusters (B n−), revealing a prevalent planar world that laid the foundation for borophenes. Investigations of metal-doped boron clusters not only lead to novel structures but also provide important information about the metal-boron bonds that are critical to understanding the properties of boride materials. The current review focuses on recent advances in transition-metal-doped boron clusters, including the discoveries of metal-boron multiple bonds and metal-doped novel aromatic boron clusters. The study of the RhB− and RhB2O− clusters led to the discovery of the first quadruple bond between boron and a transition-metal atom, whereas a metal-boron triplebond was found in ReB2O− and IrB2O−. The ReB4− cluster was shown to be the first metallaborocycle with Möbius aromaticity, and the planar ReB6− cluster was found to exhibit aromaticity analogous to metallabenzenes.

中文翻译：

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利用光电子能谱探讨小型金属掺杂硼团簇中过渡金属硼键的性质和新型芳香性

光电子能谱与量子化学相结合已成为阐明尺寸选定的硼簇的结构和键合的有效方法（Bn-），揭示了一个普遍存在的平面世界，为硼烯奠定了基础。对金属掺杂硼簇的研究不仅产生了新颖的结构，而且还提供了有关金属-硼键的重要信息，这对于理解硼化物材料的性能至关重要。本综述重点关注过渡金属掺杂硼簇的最新进展，包括金属硼多重键和金属掺杂新型芳香硼簇的发现。 RhB的研究-和RhB2氧-簇导致了硼和过渡金属原子之间第一个四键的发现，而 ReB 中发现了金属-硼三键2氧-和红外辐射2氧-。雷布4-团簇被证明是第一个具有莫比乌斯芳香性的金属劳动环，平面 ReB6-发现簇表现出类似于金属苯的芳香性。