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The reaction between a dialkyl-substituted alumanyl anion and [Y(CH 2 SiMe 3 ) 2 (thf) 3 ][BPh 4 ] resulted in the formation of (dialkylalumanyl)yttrium complex 2 , which exhibits the first 2-center-2-electron (2c-2e) Al-Y bond. The 1 H and 13 C NMR spectra of 2 together with an X-ray crystallographic analysis indicated a C 2v symmetrical structure. DFT calculations on 2 revealed that its LUMO consists of overlapping 3p- and 4d-orbitals of the Al and Y atoms, respectively, and that the HOMO-LUMO gap is narrow. The UV-Vis spectrum of 2 exhibited a visible absorption at 432 nm, which suggests that the strong σ-donating and π-accepting character of the three-coordinate dialkylalumanyl ligand generates a colored d 0 -complex that does not contain any π-electrons.
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Name: Chemistry (Weinheim an der Bergstrasse, Germany)
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