Back to top; 15.5: Some Chemical Consequences of Aromaticity; 15.7: A Molecular Orbital Description of Aromaticity and Antiaromaticity Geometry is one of the primary and most direct indicators of aromaticity and antiaromaticity: a regular structure with delocalized double bonds (e.g., benzene) is symptomatic of aromaticity, whereas a distorted geometry with localized double bonds (e.g., 1,3‐cyclobutadiene) is characteristic of antiaromaticity. bonding in the ground (S0), first singlet excited (S1) and lowest triplet (T1) electronic states of disulfur dinitride, S2N2, were investigated by analyzing the isotropic magnetic shielding, σiso(r), in the space surrounding the mol. 15.7: A Molecular Orbital Description of Aromaticity and Antiaromaticity. The simple average C–C bond length in a cyclic, planar molecule is promoted in this work as a correlating predictor of aromaticity or antiaromaticity, but no attempt is made to define either term. Aromaticity is a fundamental concept in chemistry. 11, showing graphically how the valence bond wave function has smaller probability of having z 1 = z 2, leading to lower electron repulsion energies.However, the molecular orbital wave function is smoother, leading to smaller kinetic energies. It is described by Hückel’s rule that states that a cyclic planar π-system is aromatic when it shares 4n+2 π … Aromaticity, antiaromaticity and chem. 38 degree of aromaticity in nonplanar compounds. Geometry is one of the primary and most direct indicators of aromaticity and antiaromaticity: a regular structure with delocalized double bonds (e.g., benzene) is symptomatic of aromaticity, whereas a distorted geometry with localized double bonds (e.g., 1,3‐cyclobutadiene) is characteristic of antiaromaticity. Nomenclature of Monosubstituted Benzenes. Aromaticity is not a well‐defined term. I.e., [4 n]annulenes are aromatic and [4 n+2]annulenes are antiaromatic. Back to top; 15.5: Some Chemical Consequences of Aromaticity; 15.7: A Molecular Orbital Description of Aromaticity and Antiaromaticity In organic chemistry, Möbius aromaticity is a special type of aromaticity believed to exist in a number of organic molecules. Electron occupancy in MO’s and aromaticity – NMR concept of aromaticity and The NICSzz-scan curves of aromatic organic, inorganic and “all-metal” molecules in conjunction with symmetry-based selection rules provide efficient diagnostic tools of the σ-, π- and/or double (σ + π)-aromaticity. How Benzene Reacts. 15.6: Antiaromaticity Last updated; Save as PDF Page ID 13951; No headers.


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