THE 1ST DISC-SHAPED DINUCLEAR PLATINUM MESOGEN

The cycloplatination of the tetrasubstituted imine 1 leads to the dipl atinum organyl 3 as the main reaction product, which represents the fi rst example of a new class of metallomesogens exhibiting monotropicall y a nematic-discotic phase. An X-ray crystal structure of this anti-is omer 3 has been performed. Furthermore, this platinomesogen also shows the induction of a hexagonal columnar mesophase (D(ho)) on doping wit h 2,4,7-trinitrofluorenone as an electron acceptor. Compared to the an alogous palladomesogen the two mesophases observed are more stable in the case of the platinum liquid crystal.