**Author details**

Betul Caliskan

ion: first, it is difficult to form a barrier around the cyclopentadienyl ring. And the second is

The same idea, that is, double-decker ferrocene complexes, has also been examined by the Nakamura group [72, 73]. They studied both theoretical and experimental arguments and found that the addition of a second ferrocene fraction leads to strong instability and

In metallocenes, the radicals can occur in a variety of ways. Photolysis (ultraviolet light), radiolysis (gamma-irradiation), spin trapping and photochemical reactions can be created radical. It has been observed that a wide variety of radicals are formed by these methods. The ionic

radicals are formed through charge-transfer interactions.





the difficulty in ionizing to produce the cyclopentadienyl group.

38 Recent Progress in Organometallic Chemistry

can produce very short-lived radical ion pairs [74]. The complex 2η<sup>5</sup>

double-decker ferrocene complex, is shown in **Figure 14**.

**4. Conclusion**

**Figure 14.** Complex 2η<sup>5</sup>

Address all correspondence to: bcaliska@gmail.com

Department of Physics, Faculty of Arts and Science, Pamukkale University, Kinikli, Denizli, Turkey
