Nickel(II), Palladium(II), Platinum(II), and Magnesium(II) Fluorene-Substituted Porphyrinates: Synthesis, Structure, and Comparative Analysis of Fluorescence Spectra

Yu. A. Plachev*, A. Yu. Chernyadyev, and A. Yu. Tsivadze

Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, 31 Leninskii pr., str. 4, Moscow, 19991 Russia

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Received December 11, 2008

Abstract — Using free meso-tetra(2-fluorenyl)porphine (H₂TFP) and nickel(II), palladium(II), and platinum(II) chlorides and an MgBr₂ · Et₂O complex, corresponding metal porphyrinates were synthesized with a high yield. The structures of these new compounds were studied by means of ¹H NMR spectroscopy and electron absorption spectroscopy. The fluorescence spectra of the synthesized compounds in toluene solution were comparatively analyzed. Coordination of Mg²⁺ ion with porphyrinic cycle H₂TFP significantly increases the fluorescence intensity of porphyrinic luminophore; however, the coordination of platinum metal ions (Pt²⁺, Pd²⁺) with tetrapyrrole fragment H₂TPP decreases the fluorescence intensity of porphyrinic cycle and, in the case of nickel ions, fluorescence transitions disappear

PACS numbers: 81.16.Fg; 81.05.Lq; 81.07. Nb