Azahelicene-phosphole

Interestingly, the X-ray diffraction study of complex 7h (Scheme 11.6) and 8h,i (Scheme 11.7) revealed that the twist angle between the phosphole ring and the azahelicene (<50°) allows an electronic interaction between these two 7r-units to take place. [46, 45] The helical shape of the aza[4]helicene part is not perturbed upon complexation since the twist angle between the two terminal aromatic rings of the aza[4]helicene (33.1°) is comparable to that of the free ligand (30.1°) [45,46]. This result shows that mixed phosphole-azahelicene derivatives can act as... 

Graule S, Rudolph M, Vanthuyne N, Autschbach J, Roussel C, Crassous J, R6au R (2009) Metal-Bis(helicene) assemblies incorporating pi-conjugated phosphole-azahelicene ligands impacting chiroptical properties by metal variation. J Am Chem Soc 131 3183... 

Graule S, Rudolph M, Shen W, Lescop C, Williams JAG, Autschbach J, Crassous J, R6au R (2010) Assembly of pi-Conjugated phosphole azahelicene derivatives into chiral coordination complexes an experimental and theoretical study. Chem Eur J 16 5976... 

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