Table 2. Surface map values for the σ-holes of 3^Ch .

Entry	Compound	C(benzim)—Ch1 a	C(benzim)—Ch2 a	CH3—Ch1 a	CH3—Ch2 a	C(core)—H b	Maximum
1	3Te	152.4	153.3	147.8	147.2	145.2	–
2	3Se	146.6	144.7	145.9	145.6	146.9 c	147.9
3	3S	141.0	144.2	144.5	144.9 c	146.6 c	149.1

Notes: (a) surface map values in kcal mol⁻¹ in the elongation of the respective bonds, (b) the H atom at the 2-position of the central benzene core and (c) approximate values due to the unclear definition of the σ-holes.