Dual Response Organogel Based on Irdium complex and Eu（Ⅲ） hybrid for Volatile Acid and Organic Amine Vapors
A thiophene-based hybrid organogel system consisting of complex iridium (Ir) and EuCl3•6H2O was designed and synthesized to realize dual responses to volatile acid and organic amine vapors. The photophysical properties and self-assembly of compound 1 and hybrid organogel were also studied. Compound 1 could gelate some organic solvents and self-assemble into 3D nanofibers in the gels. The stable hybrid organogel 1-Ir-Eu could be obtained after addition of complex Ir and EuCl3•6H2O. FTIR spectral results showed hydrogen bond was still existed even if addition complex Ir, EuCl3•6H2O, NaOH and CF3COOH to organogel 1. Interestingly, emission properties of the hybrid organogel 1-Ir-Eu could be in interconversion between cyan light and red light via addition of NaOH and CF3COOH. The emission properties of xerogel film 1-Ir-Eu obtained at the presence of NaOH could be also in fast and reversible transition under response to volatile acid such as CF3COOH, formic acid, acetic acid, propionic acid and organic amine vapors such as ammonium hydroxide, Et3N, tripropylamine, ethylenediamine. The emission spectral change of Ir-Eu in organogel or xerogel under the presence of base and acid demonstrated the new complex formation between complex Ir and EuCl3•6H2O. This dual-response process could be repeated for many times. The contact angle experiment results further showed the morphology and internal components of xerogel film surface in the process of response to gaseous CF3COOH and Et3N. This work provides a method for producing multifunctional supramolecular materials for senor of volatile acid and organic amine vapors.