A Quantum Chemical Study for the Basic Molecule Constituting a Subclass of Flavonoid

A quantum study was carried out the structure and the characteristics of the basic molecules that constituting the subgroup of flavonoid i.e. flavan, flavanone, flavonol, anthocyanidine, flavone, isoflavone, and flavonol. We have reported and discussed the stable structure of isomers and physical quantities associated with the frontier energy, which are HOMO-LUMO energy difference, electronegativity, chemical potential, molecular hardness, softness, electrostatic potential, electrophilicity, electrodonating power and electro-accepting power. And we also have presented and discussed the physical quantities associated with the frontier orbital, such as frontier orbital figure, electrostatic potential diagram, polarizability, dipole moments etc., and also the values of free energy and entropy of each molecule obtained as a result of the vibration-rotation analysis The physical quantities reported and discussed are considered important data for understanding the reactivity, biological, pharmacological activity, and antioxidant properties of molecules belonging to flavonoid in the future