New luminophors based on the binuclear helicates of d-METALS with BIS(DIPYRRIN)S

• DOI: 10.1016/j.dyepig.2014.10.002
• Publication Date: 2014-10-12T17:08:06Z
• Authors: Elena V. Antina; Rimma T. Kuznetsova; Lubov A. Antina; Galina B. Guseva; Natalia A. Dudina; Anatolij I. V'yugin; Alexey V. Solomonov
• Keywords: Quantum yield

Abstract The review highlights recent advances devoted to new luminophores based on d -metal complexes of bis(dipyrrin)s of [M 2 L 2 ]. The [M 2 L 2 ] helicates possess intense absorption in a visible spectrum region. The [Zn 2 L 2 ], [Cd 2 L 2 ] and [Hg 2 L 2 ] helicates are fluorophores with the most intense fluorescence in nonpolar solvents. The fluorescence of [M 2 L 2 ] bis(dipyrrinate)s decreases by two-fold in aromatic solvents and becomes close to zero in electron-donor media. The fluorescence is increased in a series of 2,2′-, 2,3′-, 3,3′-bis(dipyrrinate)s with similar complexing agent and in a series of [Hg 2 L 2 ], [Cd 2 L 2 ], [Zn 2 L 2 ] complexes with the same ligand. Upon freezing and cooling of [Zn 2 L 2 ] in ethanol from 300 to 77 K the fluorescence quantum yield of [Zn 2 L 2 ] is increased up to 100 times. The [Zn 2 L 2 ] complexes are able to generate the stimulated emission induced at the 550–560 nm region in nonpolar solvents upon excitation by second harmonic Nd:YAG laser.