Although angular-shaped naphthodifurans, naphtho[1,2-b;5,6-bâ²]- and naphtho[2,1-b;6,5-bâ²]-difuran, are formally isoelectronic with chrysene as their thiophene counterparts, naphtho[1,2-b;5,6-bâ²]- and naphtho[2,1-b;6,5-bâ²]-dithiophene, the HOMO energy level of naphthodifurans is much higher than those of naphthodithiophenes and chrysene. The difference in electronic structure in the ground state can be explained by distinct electronic perturbation from the outermost aromatic rings.
尽管角形
萘并二
呋喃、
萘并[1,2-b;5,6-bâ²]-和
萘并[2,1-b;6,5-bâ²]-二
呋喃在形式上以 chrysene 为等电子体。
噻吩对应物,
萘并[1,2-b;5,6-b-2]-和
萘并[2,1-b;6,5-b-2]-二
噻吩,
萘并二
呋喃的HOMO能级远高于
萘并二
噻吩和 的那些。基态电子结构的差异可以通过最外层芳环的不同电子扰动来解释。