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The tetrel bond formed between the σ-hole on the C atom of H n XCH 3  (X = F, Cl, and Br, n = 0; X = O, S, and Se, n = 1; X = N, P, and As, n = 2) and the N atom of NCM (M = Li and Na) was studied by ab initio calculations at the MP2/aug-cc-pVTZ level. The molecules involving nitrogen or oxygen group substituents engage in a weaker tetrel bond with interaction energies in the range of 5–12 kJ/mol. In contrast, a stronger tetrel bond is formed when the X atom of H n XCH 3  is a halogen, with interaction energies in the range of 16–18 kJ/mol. The tetrel bond is further enhanced by the addition of the electron-deficient molecule BeH 2  or BH 3  to the X atom of H n XCH 3  and the interaction energy can be increased to 38 kJ/mol. Moreover, the enhancing effect of beryllium bond on the tetrel bond is greater than that from the triel bond.

molecular physics

Tetrel bond involving -CH 3  group in H n XCH 3  (X = F, Cl, and Br, n = 0; X = O, S, and Se, n = 1; X = N, P, and As, n = 2). Cooperativity with triel bond and beryllium bond