Synthesis and characterization of a proton-transfer complex of 1,2,4,5-benzenetetracarboxylic acid with 1, 10-phenanthroline

Abstract

A proton-transfer complex of 1,2,4,5-benzenetetracarboxylic acid (H₄BTC) with 1,10-phenanthroline (phen), [(H₂BTC)²⁻·2(Hphen)⁺·(H₄BTC)] was synthesized and characterized by IR, UV-Vis spectra and luminescence. The structure was determined by X-ray single crystal diffraction. It crystallizes in the triclinic system, space group P-1 with a=7.3767(15), b=10.704(2), c=12.890(3) Å, α=102.96(3), β=105.71(3), γ=99.68(3)^o, V=926.0(3) ų, D_c=1.558 g/cm³, Z=2, μ(Mo-Kα)=0.121 mm⁻¹ and F(000)=448. The final R=0.0401 and wR=0.0862 for 2983 observe reflections with [1>2σ(1)]. It is composed of discrete H4BTC molecules, H₂BTC²⁻ anions and, [Hphen]⁺ cations. The extensive hydrogen-bonding associations formed between the H4BTC molecules and H₂BTC²⁻ anions result in the formation of a two-dimensional layer, to which the [Hphen]⁺ cations are attached through the hydrogen bonds formed between the carboxyl groups of H₄BTC and the NH groups of [Hphen]⁺. Under the excitation of UV light, it emits an intense blue luminescence.

Keywords

proton-transfer / 1,2,4,5-benzenetetracarboxylic acid / 1,10-phenanthroline

References

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