Keywords: Liquid crystals / Metallomesogens / Charge-transfer complexes / Palladium organyls / Platinum organyls ortho-Palladated and -platinated benzalimines are a widely studied novel type of liquid-crystals. These sheet-shaped materials contain two or even four metal atoms and carry eight and twelve flexible side-chains, respectively. Here we present the preparation and mesomorphic properties of dinuclear chiral homologues of such sheet-like compounds. On their own, the chiral members of the dinuclear cyclopalladated series exhibit no liquid-crystalline properties, but show [a] their core section (bridging ligands and the metal atom) as well as their aliphatic periphery. [3Ϫ7] Chiral mesophases formed by chiral mesogens are of special interest with respect to their electro-optical properties and possible applications resulting from these properties. The number of sheet-or disc-like chiral mesogens in general and particularly of those exhibiting the cholesteric-nematic discotic (N D * ) type of mesophase found so far is quite limited. [8,9] Here, we report the synthesis and liquid-crystalline properties of the first chiral members of flat, sheet-like dinuclear palladium and platinum organyls.
Result and DiscussionChirality can be introduced into sheet-like dinuclear palladium or platinum organometallic compounds of the type Scheme 1
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