7.5.2 Magnetic Symmetry, Stagnation Graph and Induced
Current Density of Mono-cyclic Neutral and Charged
C n H n Systems in a Magnetic Field
Several attempts have been made to achieve reliable representations of the J
B
current density field in neutral and charged cyclic conjugated compounds with
chemical formula C n H n in the presence of a static magnetic field orthogonal to the
molecular r h plane, in connection with their magnetotropicity [15]. The molecular
point group symmetry of these unsaturated systems determines the essential features of the induced current density field and relative SG. D nh ðC nh Þ magnetic groups
[58, 98, 99] were considered to discuss the symmetry of conjugated cyclic molecules [104].
Fig. 7.17 Perspective view of the current density vector field in ethane C 2 H 6 , with magnetic
symmetry D 3d ðS 6 Þ. The uniform external magnetic field B is parallel to the C–C bond axis
190
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