Abstract
A general strategy for the syntheses of 4, 4', 6, 6'-substituted-2, 2'-bipyridines starting from aromatic aldehyde is described. A series of sodium cryptates and two europium cryptates [Eu⊂bpy·bpy·bpy]·2Cl·Br (bpy=6, 6'-dimethylene-2, 2'-bipyridine-4, 4'-dimethylester) ( 23 ) and [Eu⊂bpy 1 ·bpy 1 ·bpy 2 ]·2Cl·Br (bpy 1 =6, 6'-dimethylene-2, 2'-bipyridine-4, 4'-dicarboxylic acid, bpy 2 =6, 6'-dimethylene-2, 2'-bipyridine-4, 4'-diformylethylenediamine) ( 24 ), were synthesized from these compounds. Sodium cryptates have been confirmed by 1 H NMR, 13 C NMR and high resolution mass spectrum (HRMS). The structure of europium cryptate 23 was confirmed by X-ray diffraction (XRD) and HRMS. The photoluminescence (PL) spectra, decay curve and the absolute quantum efficiency ( η ) of 23 are presented. 23 can be efficiently excited by near-UV light and presents a bright red luminescence with the lifetime ( τ ) of 0.32 ms and the η of 70%. It is suggested that 23 is expected to be a potential efficient phosphor for lighting and display.
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