Mesomorphic Properties of a Metallomesogen Based on a Copper(II) Metal-Chain Structure
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Abstract
Liquid crystalline properties have been introduced into one-dimensional metal-chain complexes based on Cu(pyridine)2X2 via straightforward derivatization of the pyridyl ligands. When the aliphatic portion of the mesogen is introduced via an ester, no mesophase behavior is observed; however, when an amide group is used as the means of incorporating the flexible portion of the molecule, a mesogenic material results. The structure of these amide-derivatized materials is different when obtained from solution vs from the melt, due to changes in the hydrogen-bonding framework formed along the chain. The solution-derived material does not display any mesophase behavior, whereas the material derived from the melt does. The thermal behavior of these materials is somewhat complicated by the variety of noncovalent interactions (hydrogen bonds, metal−halide bridging interactions) involved. By including hydrogen-bonding groups in the ligands at positions opposite to the metal-coordination site it is possible to significantly affect the environment of the metals in these complexes, presumably via compression of the bridging Cu−X bonds.
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