The dithia [3.3] pyridinophane consisting of two pyridine rings has been found out to assume the syn-structure by the X-ray crystallography, meaning the two nitrogen atoms point in the same direction. From this cyclophane and cis-protected palladium (II), the self-assembled coordination molecular cage has been constructed.
[Dasari, Raghunath R.; Sartin, Matthew M.; Cozzuol, Matteo; Barlow, Stephen; Perry, Joseph W.; Marder, Seth R. Chemical Communications, 2011 , vol. 47, # 15 p. 4547 - 4549]