A digalla[1.1]ferrocenophane and its coordination chemistry: Synthesis and structure of [{Fe(eta(5)-C5H4)(2)}(2){GaMe}(2)] and of the adducts [{Fe(eta(5)-C5H4)(2)}(2)GaMe(D)}(2)] (D = monodentate donor) and [Fe(eta(5)-C5H4)(2)}(2){GaMe}(2)D] (D = bidentate donor)

Althoff A, Jutzi P, Lenze N, Neumann B, Stammler A, Stammler H-G (2003)
ORGANOMETALLICS 22(13): 2766-2774.

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Abstract
Gentle warming of 1,1'-bis(dimethylgallyl)ferrocene (1) leads to the formation of trimethylgallium and the thermolabile compound [{Fe(eta(5)-C5H4)(2)}(2){GaMe}(2)] (2), a [1.1] ferrocenophane featuring group 13 elements in bridging positions. While NMR data for 2 prove a dynamic structure in solution, X-ray data reveal an anti conformation of the ferrocenophane framework in the solid state. The anti conformation is maintained in the thermolabile adducts 2a-g, which are obtained from 2 and the donors diethyl ether (2a), pyridine (2b), pyrimidine (2c), quinoxaline (2d), DMSO (2e), pyrazine (2f), and dioxane (2g), by donor-exchange reactions (2b-g) or on gentle warming of the respective donor adducts of 1. Rodlike polymers are formed either by interaction of 2 with bidentate donors (2f,g) or by :pi-stacking effects of aromatic molecules acting as monodentate donors (2b-d). Steric requirements inhibit the complex formation between 2 and the donor phenazine. A cyclic voltammogram of 2b in pyridine reveals two reversible oxidation steps at -314 and - 114 mV, indicating only weak electron delocalization in the cationic species. The formation of 2 from 1 has been shown to be reversible and thus is an example of an application of "dynamic covalent chemistry" as synthetic strategy.
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Althoff A, Jutzi P, Lenze N, Neumann B, Stammler A, Stammler H-G. A digalla[1.1]ferrocenophane and its coordination chemistry: Synthesis and structure of [{Fe(eta(5)-C5H4)(2)}(2){GaMe}(2)] and of the adducts [{Fe(eta(5)-C5H4)(2)}(2)GaMe(D)}(2)] (D = monodentate donor) and [Fe(eta(5)-C5H4)(2)}(2){GaMe}(2)D] (D = bidentate donor). ORGANOMETALLICS. 2003;22(13):2766-2774.
Althoff, A., Jutzi, P., Lenze, N., Neumann, B., Stammler, A., & Stammler, H. - G. (2003). A digalla[1.1]ferrocenophane and its coordination chemistry: Synthesis and structure of [{Fe(eta(5)-C5H4)(2)}(2){GaMe}(2)] and of the adducts [{Fe(eta(5)-C5H4)(2)}(2)GaMe(D)}(2)] (D = monodentate donor) and [Fe(eta(5)-C5H4)(2)}(2){GaMe}(2)D] (D = bidentate donor). ORGANOMETALLICS, 22(13), 2766-2774.
Althoff, A., Jutzi, P., Lenze, N., Neumann, B., Stammler, A., and Stammler, H. - G. (2003). A digalla[1.1]ferrocenophane and its coordination chemistry: Synthesis and structure of [{Fe(eta(5)-C5H4)(2)}(2){GaMe}(2)] and of the adducts [{Fe(eta(5)-C5H4)(2)}(2)GaMe(D)}(2)] (D = monodentate donor) and [Fe(eta(5)-C5H4)(2)}(2){GaMe}(2)D] (D = bidentate donor). ORGANOMETALLICS 22, 2766-2774.
Althoff, A., et al., 2003. A digalla[1.1]ferrocenophane and its coordination chemistry: Synthesis and structure of [{Fe(eta(5)-C5H4)(2)}(2){GaMe}(2)] and of the adducts [{Fe(eta(5)-C5H4)(2)}(2)GaMe(D)}(2)] (D = monodentate donor) and [Fe(eta(5)-C5H4)(2)}(2){GaMe}(2)D] (D = bidentate donor). ORGANOMETALLICS, 22(13), p 2766-2774.
A. Althoff, et al., “A digalla[1.1]ferrocenophane and its coordination chemistry: Synthesis and structure of [{Fe(eta(5)-C5H4)(2)}(2){GaMe}(2)] and of the adducts [{Fe(eta(5)-C5H4)(2)}(2)GaMe(D)}(2)] (D = monodentate donor) and [Fe(eta(5)-C5H4)(2)}(2){GaMe}(2)D] (D = bidentate donor)”, ORGANOMETALLICS, vol. 22, 2003, pp. 2766-2774.
Althoff, A., Jutzi, P., Lenze, N., Neumann, B., Stammler, A., Stammler, H.-G.: A digalla[1.1]ferrocenophane and its coordination chemistry: Synthesis and structure of [{Fe(eta(5)-C5H4)(2)}(2){GaMe}(2)] and of the adducts [{Fe(eta(5)-C5H4)(2)}(2)GaMe(D)}(2)] (D = monodentate donor) and [Fe(eta(5)-C5H4)(2)}(2){GaMe}(2)D] (D = bidentate donor). ORGANOMETALLICS. 22, 2766-2774 (2003).
Althoff, A, Jutzi, Peter, Lenze, N, Neumann, B, Stammler, A, and Stammler, Hans-Georg. “A digalla[1.1]ferrocenophane and its coordination chemistry: Synthesis and structure of [{Fe(eta(5)-C5H4)(2)}(2){GaMe}(2)] and of the adducts [{Fe(eta(5)-C5H4)(2)}(2)GaMe(D)}(2)] (D = monodentate donor) and [Fe(eta(5)-C5H4)(2)}(2){GaMe}(2)D] (D = bidentate donor)”. ORGANOMETALLICS 22.13 (2003): 2766-2774.
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