Abstract
A new photoluminescent 3-D coordination polymer 1 containing a trinuclear Cd(II) cluster [Cd3(TMA)2] (TMA = trimesate) has been synthesized under solvothermal conditions, reacting Cd(II) ions with trimesic acid in the presence of isoquinoline and DMF. Compound 1 contains three crystallographically different Cd(II) ions interconnected by two trimesate ligands. The Cd(1) and Cd(2) ions are six-coordinated with a distorted-octahedral coordination sphere, {Cd(1)O6} and {Cd(2)NO5} respectively. The Cd(3) ion is seven-coordinated having a distorted-monocapped trigonal prismatic geometry {Cd(3)N2O5}. Crystallographic studies shows that 1 has two-dimensional sheets interlock each other, giving rise to a twofold interpenetrating network consisting of trinuclear cores [Cd3(TMA)2] as nodes bridged by trimesate anions. Compound 1 exhibits a strong blue emission in solid-state (λem = 430 nm) and suspensions in different organic solvents (λem = 405–440 nm) at room temperature with lifetimes in the nanosecond range. Structure-related photoluminescence is attributed to presence of the rigid trinuclear core involving coordinated isoquinoline molecules. The crystalline material of 1 possess thermal stability up to 200 °C.
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