title: Mesomorphism of ionic allylpalladium(II) complexes containing pz(R2)py as ligands and [BF4]-, [PF6]- or [CF3SO3]- as counteranions.
abstract: The synthesis and thermal behaviour is reported of some ionic liquid-crystalline complexes formed when a mesogenic, two-chained, pyrazolylpyridine ligand is bound to a eta3-allylpalladium(II) fragment. The phase behaviour of the complexes is dominated by the formation of the SmA phase and, while the stability of the crystal phase appears to be controlled by intermolecular solid-state interactions, the stability of the liquid crystal phases is controlled by the length of the ligand alkoxy chains. Some of the complexes also show a complex polymorphism leading to the observation of double-melting behaviour.
authors.affiliation: Departamento de Química Inorgánica I, Facultad de Ciencias Químicas, Universidad Complutense, E-28040, Madrid, Spain.
authors.forename: Mari Carmen
authors.initials: MC
authors.lastname: Torralba
authors.forename: José Antonio
authors.initials: JA
authors.lastname: Campo
authors.forename: José Vicente
authors.initials: JV
authors.lastname: Heras
authors.forename: Duncan W
authors.initials: DW
authors.lastname: Bruce
authors.forename: Mercedes
authors.initials: M
authors.lastname: Cano