7.5.3 Five-Membered Heterocyclic Molecules
The stagnation graphs of 1,3-cyclopentadiene, furan, pyrrole, and thiophene, in the
presence of a magnetic field perpendicular to the molecular plane [111], are displayed
in Fig. 7.22. They show that the electron flow induced by a perpendicular magnetic
field in pentatomic cyclic molecules with C 2v ðC s Þ f E TC 2 Tr v r
0
v g
symmetry is characterized by a regime remarkably different from that of D nh ðC nh Þ
compounds discussed in Sect. 7.5.2. An analogous consideration was made for
Fig. 7.22 The stagnation graph of five-membered cyclic compounds. Clockwise from top left:
1,3-cyclopentadiene, pyrrole, furan, and thiophene in the presence of a magnetic field
perpendicular to the molecular plane. Diamagnetic (paramagnetic) vortices are represented by
green (red) lines, and saddle lines are blue. All the stagnation lines lie on the Tr v plane of
magnetic symmetry
196
P. Lazzeretti
The stagnation graphs of 1,3-cyclopentadiene, furan, pyrrole, and thiophene, in the
presence of a magnetic field perpendicular to the molecular plane [111], are displayed
in Fig. 7.22. They show that the electron flow induced by a perpendicular magnetic
field in pentatomic cyclic molecules with C 2v ðC s Þ f E TC 2 Tr v r
0
v g
symmetry is characterized by a regime remarkably different from that of D nh ðC nh Þ
compounds discussed in Sect. 7.5.2. An analogous consideration was made for
Fig. 7.22 The stagnation graph of five-membered cyclic compounds. Clockwise from top left:
1,3-cyclopentadiene, pyrrole, furan, and thiophene in the presence of a magnetic field
perpendicular to the molecular plane. Diamagnetic (paramagnetic) vortices are represented by
green (red) lines, and saddle lines are blue. All the stagnation lines lie on the Tr v plane of
magnetic symmetry
196
P. Lazzeretti