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Liquid‐crystalline Compounds, 86. The First Disc‐Shaped Dinuclear Platinum Mesogen

1994; Wiley; Volume: 127; Issue: 8 Linguagem: Inglês

10.1002/cber.19941270832

0009-2940

Klaüs Praefcke, Belkız Bilgin, Joachim Pickardt, M. Borowski,

Porphyrin and Phthalocyanine Chemistry

The cycloplatination of the tetrasubstituted imine 1 leads to the diplatinum organyl 3 as the main reaction product, which represents the first example of a new class of metallomesogens exhibiting monotropically a nematic‐discotic phase. An X‐ray crystal structure of this anti ‐isomer 3 has been performed. Furthermore, this platinomesogen also shows the induction of a hexagonal columnar mesophase (D ho ) on doping with 2,4,7‐trinitrofluorenone as an electron acceptor. Compared to the analogous palladomesogen the two mesophases observed are more stable in the case of the platinum liquid crystal.