The replacement of a CH group of benzene by a triel (Tr) atom places a positive region of electrostatic potential near the Tr atom in the plane of the aromatic ring. This σ-hole can interact with an X lone pair of XCCH (X=F, Cl, Br, and I) to form a triel bond (TrB). The interaction energy between C H Tr and FCCH lies in the range between 2.2 and 4.4 kcal/mol, in the order Tr=B
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- * Stability analysis reveals that Al(III) compounds are more stable than Al(I), with the stability of triel(III) decreasing as the atomic size increases, particularly noting that Tl(I) complexes are more stable than Tl(III) compounds.
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