Knowledge Bank

An extension of the Urey-Bradley force field for aromatic rings has been applied to a calculation of the planner vibration fundamentals of naphthalene, using only sixteen force constants transferred from benzene. The results of a zero-order calculation are compared with those obtained from an unmodified UBFF and these are in turn, compared with the assignments proposed by Scully and $Whiffen1$ and Freeman and $Ross.2$