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Updated: May 17, 2026

Synthesis of pH Dependent Pyrazole, Imidazole, and Isoindolone Dipyrrinone Fluorophores using a Claisen-Schmidt Condensation Approach
Published on: June 10, 2021
Propylamino-connected fluorescent terpyridine dimer and trimer: syntheses, photophysical properties and formation of
Yuka Kamoya1, Keisuke Kojima, Gentaro Tanaka
1Institute of Industrial Science, University of Tokyo, 4-6-1 Komaba, Tokyo 153-8505, Japan.
Abstract:
By using propylamine as a connector, a dimer (L2) and trimer (L3) of 2,2':6',2''-terpyridine (tpy) are synthesized. They showed the lowest energy π–π* absorption at 354 nm and blue fluorescence at 420 nm with a moderate quantum yield in solution. Spectral titrations, electrospray ionization mass spectrometry (ESI-MS), (1)H–(1)H rotating-frame nuclear Overhauser effect correlation spectroscopy (ROESY), and structure simulation (MOPAC/PM5) indicated that both L2 and L3 form duplex-type multi-component complexes with Cd(II), [Cd(2)(L2)(2)](4+) and [Cd(3)(L3)(2)](6+), respectively. While the luminescence of these complexes was quite weak in solution (quantum yield Φ < 0.005), the complexes showed enhanced emission in the solid state with remarkable increase of the quantum yield (Φ = 0.13).
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