Proton Conductivities of Stepwise Protonated Imidazole‐Fused Tetraphenylene Derivatives

W4415042710 · 수집 2026-10-04 18:16:49

T10409 Conducting polymers and applications

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The control of crystal structure and proton conductivity was evaluated by stepwise protonation of tetraphenylene molecules (ImTP) containing a imidazole group. By controlling the degree of protonation from neutral ImTP to H1ImTP⁺, H2ImTP2⁺, and H4ImTP⁴⁺, we demonstrated that the balance between intermolecular hydrogen bonding and electrostatic interactions affects structural stability and proton conductivity. X-ray diffraction analysis revealed that neutral ImTP forms a 2D hydrogen bond network, while H1ImTP⁺ exhibits enhanced structural stability due to N─H⁺···Cl- electrostatic interactions. H2ImTP2⁺ forms a 3D network, and H4ImTP⁴⁺ becomes amorphous. Under 40% relative humidity conditions, these compounds adsorb H2O to form proton conduction pathways, exhibiting conductivities of 3.20 × 10- 7, 3.38 × 10- 6, 1.35 × 10- 6, and 6.20 × 10- 6 S cm- 1 at ∼363 K for n = 0, 1, 2, and 4 of HnImTPn⁺Cl- n system, respectively. In particular, H1ImTP⁺ exhibits an optimal balance between hydrogen bonding and electrostatic interactions, resulting in high structural stability, reversible H2O adsorption, and proton conductivity.

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