6-azulenylethynyl-substituted benzenes

With the ability of stabilizing both cations and anions due to its polarized structure, azulene can in principle be used as a building block for the construction of redox-active molecules, such as polyelectrochromic materials, which respond to different potentials with a variety of colors. In this context, Ito and coworkers synthesized a series of 6-azulenyl-substituted benzenes (4-7) [9-11] and 6-azulenylethynyl-substituted benzenes (8-11) [12], as shown in Figure 4.3, and investigated their redox behaviors. 

Figure 4.3 Structures of 6-azulenyl-substituted benzenes 4-7 and 6-azulenylethynyl-substituted benzenes 8-11.

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