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Unique reactivity of B in B[Ge9Y3]3 (Y = H, CH3, BO, CN): formation of a Lewis base

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Abstract

Boron compounds usually exhibit Lewis acidity at the boron center due to the presence of vacant p-orbitals. We show that this chemistry can be altered by an appropriate choice of ligands to decorate the boron center. To elucidate this effect, we studied the interactions of boron with two classes of ligands, one based on penta-substituted phenyl species (C6X5, X = F, BO, CN) and the other based on Zintl-ion-based groups (Ge9Y3, Y = H, CH3, BO, CN). An in-depth analysis of the charges and Fukui function values at the local atomic sites of the substituted boron derivatives B(C6X5)3 and B[Ge9Y3]3 shows that the B-center in the former is electrophilic, while it is nucleophilic in the latter. The chemical stability of the B[Ge9Y3]3 species is shown to be due to the presence of strong 2c-2e bonds between the B and Ge centers. Thus, the general notion of the Lewis acid nature of a boron center depends upon the choice of the ligand.

Graphical abstract: Unique reactivity of B in B[Ge9Y3]3 (Y = H, CH3, BO, CN): formation of a Lewis base

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Publication details

The article was received on 07 Aug 2019, accepted on 19 Aug 2019 and first published on 19 Aug 2019


Article type: Communication
DOI: 10.1039/C9CP04361F
Phys. Chem. Chem. Phys., 2019, Advance Article

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    Unique reactivity of B in B[Ge9Y3]3 (Y = H, CH3, BO, CN): formation of a Lewis base

    G. N. Reddy, R. Parida, R. Inostroza-Rivera, A. Chakraborty, P. Jena and S. Giri, Phys. Chem. Chem. Phys., 2019, Advance Article , DOI: 10.1039/C9CP04361F

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