N pentanol

Nuclear magnetic resonance (NMR) spectra of the as-synthesized imidazolium-based ionic liquids and the extracted complexes were measured with an NMR spectrometer (Avance 600, Bruker, Karlsruhe, Germany). The synthesized and extracted species were characterized using a Fourier-transform infrared spectrometer (NicoletiS10, Thermo Fisher Scientific, Waltham, MA, USA). UV spectra of [BUIm]Br, Pd(CN)₄²⁻, and [BUIm]-Pd (II) were recorded using a UV–Vis spectrophotometer (UV-2550, Shimadzu Corporation, Kyoto, Japan). The chemical composition of the synthesized and extracted species was analyzed using a mass spectrometer (1100HPLC/TOF, Agilent Instrument Corporation, Santa Clara, CA, USA). The concentrations of Pd(CN)₄²⁻, Fe(CN)₆³⁻, and Co(CN)₆³⁻ were determined through atomic absorption spectrometry (Z-3000, Hitachi High-Technologies Corporation, Tokyo, Japan). Extraction experiments were performed in a thermostatic shaker (ZQTY-70V, ZhiChu Instrument Corporation, Shanghai, China).
N-pentanol was purchased from Sinopharm Chemical Reagent Co., Ltd. (Beijing, China), n-heptane was purchased from Tianjin Windboat Chemical Reagent Technology Co., Ltd. (Tianjin, China), 1-butylimidazole and 1-undecane bromide were purchased from Titan Technology Co., Ltd. (Beijing, China). All reagents were analytical reagents and were used without further purification.

Odors were dissolved in mineral oil at 1% (v/v) dilution. Similar to our previous studies (Wang et al., 2019 (link); Liu et al., 2020 (link)), eight odors that always induce frequent responses were used during passive exposure: isoamyl acetate, 2-heptanone, phenyl acetate, benzaldehyde, dimethylbutyric acid, n-heptane acid, n-pentanol, and 2-pentanone (Sinopharm Chemical Reagent). In the go/no go task, only the first two pairs of odors (isoamyl acetate versus 2-heptanone and phenyl acetate versus benzaldehyde) were used. As in our previous studies (Wang et al., 2019 (link); Liu et al., 2020 (link)), isoamyl acetate and phenyl acetate were defined as S+ odors, and 2-heptanone and benzaldehyde as S– odors. Odors were presented by an odor delivery system (Thinkerbiotech, Nanjing, China). A stream of charcoal-filtered air flowed over the oil and was then diluted to 1/20 by an olfactometer. Odor presentation was synchronously controlled by the data acquisition system via a solenoid valve driven by a digital-to-analog converter. Air or odorized air was delivered at a constant rate of 1 l/min to eliminate the effect of airflow. The duration of each odor presentation was 2 s and the inter-trial interval was 30 s.