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Multiple d–d bonds between early transition metals in TM2Lin (TM = Sc, Ti) superatomic molecule clusters†
Yichun Zhou,Xinlei Yu,Longjiu Cheng
Nanoscale Pub Date : 09/22/2020 00:00:00 , DOI:10.1039/D0NR05480A
Abstract

The synthesis and application of compounds with Cr–Cr and V–V d–d quintuple bonds (σ, 2π, 2δ) have led to new thinking about whether d–d multiple bonds also exist between early transition metals such as Sc–Sc and Ti–Ti. In this study, by extensive unbiased global search at the density functional theory level, the low-energy structures of 26e and 30e TM2Lin clusters were obtained. Based on the super valence bond (SVB) theory, the prolate double-core structure of TM2Lin clusters was regarded as a superatomic molecule, of which each half was regarded as an open-shell superatom, and the electronic shell-closure was realized by forming multiple bonds between superatoms. Then, the quintuple super bonds (2δ, 2π, σ) of the Li18Ti2, Li20Sc2, [Li17V2]+, [Li17Ti2] clusters and the triple super bonds (2π, σ) of the Li24Sc2 and Li24Y2 clusters were confirmed via chemical-bonding analysis. This way of forming multiple bonds between early transition metals through superatomic bonding has promoted the experimental synthesis and application of early transition metal multiple bond compounds.

Graphical abstract: Multiple d–d bonds between early transition metals in TM2Lin (TM = Sc, Ti) superatomic molecule clusters
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