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Disc‐Like Chiral Palladium and Platinum Complexes: Synthesis and Mesomorphic Properties
Author(s) -
Eran Belkiz Bilgin,
Singer Dirk,
Praefcke Klaus
Publication year - 2001
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/1099-0682(20011)2001:1<111::aid-ejic111>3.0.co;2-9
Subject(s) - mesophase , chemistry , palladium , liquid crystal , crystallography , platinum , acceptor , columnar phase , side chain , phase (matter) , discotic liquid crystal , polymer chemistry , stereochemistry , organic chemistry , molecule , materials science , catalysis , polymer , physics , optoelectronics , condensed matter physics
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 mesophase inductions (Col h ‐phase) in mixtures with an electron‐acceptor, e.g., 2,4,7‐trinitrofluorenone ( TNF ). A diplatinated chiral analogue, however, monotropically exhibits the cholesteric nematic discotic (N D * ) type of mesophase. Mixtures of this platinum nematogen with TNF also show the induction of a columnar mesophase (Col h ) due to charge‐transfer interactions.