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Mesogenic Ni(II) complexes of Cs symmetry forming Colh phase by dipole-dipole interaction

New Ni(II) metallomesogens are described, having their chelating centre constructed from two non-identical fragments: enaminoketone and barbiturylidenomethyleno-amine rings, thus low Cs symmetry. Various side chains were attached to the mesogenic core. Despite a triangular molecular shape, almost all synthesised compounds exhibit a liquid crystalline hexagonal disordered columnar phase (Colh) with high clearing temperature. The ability to create the columnar phase is probably connected with the permanent dipole moment appearing in the non-symmetric molecules and dipole–dipole interactions between molecules in columns. This work is dedicated to Prof. Michael Hanack, with best wishes, on the occasion of his 80th birthday.