Abstract
The ternary polyionic inorganic compound Cs2Mo6Br14 and 18-crown-6 ethers bearing two o-terphenyl units have been combined to design phosphorescent columnar liquid crystalline hybrid materials. The obtained host-guest complexes are very stable even at high temperatures. Depending on their surrounding atmosphere, these hybrids switch reversibly from a high-to-low luminescence state and show a very stable emission intensity up to 140 °C.
Highlights
The ternary polyionic inorganic compound Cs2Mo6Br14 and 18-crown-6 ethers bearing two o-terphenyl units have been combined to design phosphorescent columnar liquid crystalline hybrid materials
Columnar liquid crystals (CLCs) have attracted much interest in materials chemistry since 1977 when Chandrasekhar discovered them during his studies of discotic benzene hexaalkanoates.[1]
Up to now, a transition metal cluster (TMC) containing CLC remains unknown. To design such self-assembling materials, we present a supramolecular approach in which the nanocluster alkali counter cations are complexed within the cavity of 18-crown-6 ether derivatives CEn that were previously used by some of us to design CLC (Scheme 1).[10]
Summary
The ternary polyionic inorganic compound Cs2Mo6Br14 and 18-crown-6 ethers bearing two o-terphenyl units have been combined to design phosphorescent columnar liquid crystalline hybrid materials. To design such self-assembling materials, we present a supramolecular approach in which the nanocluster alkali counter cations are complexed within the cavity of 18-crown-6 ether derivatives CEn that were previously used by some of us to design CLC (Scheme 1).[10] the LC properties of CEn ligands and their respective complexes with monocharged species have been studied,[11] we report for the first time the use and the influence of bulky polyionic inorganic species on the mesomorphic properties of CEn as well as the surprising influence of the supramolecular organization on the luminescence properties of hybrids.
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