Efficiency of the NICSzz-scan curves to probe the antiaromaticity of organic and inorganic rings/cages

Literature Information

Publication Date 2009-06-30
DOI 10.1039/B903677F
Impact Factor 3.676
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Abstract

In the present study it was demonstrated that the NICSzz-scan patterns along with symmetry-based selection rules can unequivocally probe the antiaromaticity in a wide range of antiaromatic organic and inorganic rings/cages. The NICSzz-scan profiles typical of antiaromaticity correspond to symmetric curves around the axis perpendicular to the ring plane with the positive NICSzz(R) values decaying rapidly and monotonically with respect to the distance R from the ring center. The magnitude of the induced paratropic ring currents is determined by the magnitude of the excitation energies of the rotationally (Rz) allowed HOMO → LUMO transitions. The appearance of the NICSzz-scan curves in conjunction with the symmetry-based selection rules constitute a powerful magnetic criterion of antiaromaticity capable of predicting the antiaromaticity in the realm of antiaromatic organic, inorganic and “all-metal” molecules lifting up all controversies with respect to the aromaticity/antiaromaticity for some peculiar aromatic/antiaromatic molecules.

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