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Published on: March 9, 2017
Playing with PtII and ZnII Coordination to Obtain Luminescent Metallomesogens
Adelina-Antonia Andelescu1, Benoît Heinrich2, Maria Angela Spirache1
1"Coriolan Dragulescu" Institute of Chemistry, Romanian Academy, 24 Mihai Viteazu Bvd., 300223, Timisoara, Romania.
Abstract:
Blue-green luminescent terpyridine-containing PtII and ZnII complexes are reported. Equipped with lipophilic gallate units, which act as monodentate ancillary coordinating ligands and/or as anions, they display low-temperature mesomorphic properties (lamello-columnar and hexagonal mesophases for PtII and ZnII complexes, respectively). The mesomorphic properties were investigated by polarised optical microscopy, differential scanning calorimetry, thermogravimetric analysis and X-ray scattering of bulk materials and oriented thin films. The model of self-assembly into the lamello-columnar phase of the PtII complex has been described in detail. The optical properties of the complexes were investigated in the liquid and condensed liquid crystalline states, highlighting the delicate balance between the role of the metal in determining the type of excited state responsible for the emission, and the role of the ancillary ligand in driving intermolecular interactions for proper mesophase formation.
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