QUANTUM-CHEMICAL CALCULATION OF NONLINEAR GRAPHENE MOLECULES BY THE MNDO METHOD

摘要

The first quantum-chemical calculation of the molecules 22, 124 and 200 hexagons by the method MNDO was performed with optimisation of the geometry for all parameters by a standard gradient method. The optimised geometric and electronic structures of 22, 124 and 200 hexagons were obtained and their acid strength was theoretically evaluated (pKa = 33). It was found that the molecules belong to the class of very weak CH-acids (pKa > 14).