Premium
Silver Pyrazolates as Coordination‐Polymer Luminescent Metallomesogens
Author(s) -
Barberá Joaquín,
Lantero Ignacio,
Moyano Sandra,
Serrano José Luis,
Elduque Anabel,
Giménez Raquel
Publication year - 2010
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201001766
Subject(s) - homoleptic , luminescence , supramolecular chemistry , polymer , silver nitrate , crystallography , ligand (biochemistry) , metal , metallacycle , chemistry , liquid crystal , materials science , photochemistry , polymer chemistry , crystal structure , organic chemistry , x ray crystallography , optics , biochemistry , receptor , physics , diffraction , optoelectronics
Silver pyrazolates with columnar liquid‐crystal phases that are stable at room temperature have been prepared by reaction of silver nitrate with 3,5‐diarylpyrazolates. The complexes consist of open‐chain oligomers, despite the fact that the most common structural type for homoleptic coinage metal pyrazolates is the trimeric metallacycle [M(μ‐pz)] 3 . The special characteristics of silver in forming reversible metal–ligand bonds in solution, evidenced experimentally, leads to supramolecular organizations in which the silver cations promote self‐organization of the nonmesomorphic pyrazolates into helical 1D polymers that exhibit columnar mesophases. The materials are readily soluble in common organic solvents and are liquid‐crystalline over a broader temperature range than their gold counterparts, which are known to form discrete cyclic trinuclear species. Thin films of the silver complexes show luminescence at room temperature. The compounds described here are the first examples of luminescent metallomesogens formed by a main‐chain coordination polymer.