Chemically-inert groups’ influence electronic

The electron spin resonance (ESR) spectra of the radical ions of 230 indicate there are no large deviations from the free-electron g value that would have been expected had the 3d orbitals of the sulfur atom played an important part in influencing the spin density of the molecule. Consequently, structure 230 may not be the main contributor to the electronic structure of the compound. Such stability in this compound could be attributed to the inertness of the NSN group and the presence of the aromatic naphthalene ring. However, the H-NMR chemical shifts (8 = 4.45 ppm) suggest the compound is antiaromatic. The compound is therefore referred to as an ambiguous aromatic compound (78JA1235). 

The properties and behavior of p-block metals are less homogenous than those of the s-metals because of their atomic and ionic sizes and other characteristics such as their unusual crystalline structures and the presence of the pair of electrons on the s orbital (s ) of the outermost electron shell. These s orbital electrons do not participate in chemical interactions (covalent or ionic) (inert electron pair). This influence increases with atomic number within a group. 

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