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2 protocols using 2 methyltetrahydrofuran

1

Synthesis of BIM and Aerogel Catalysts

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Chemicals were purchased from the following providers and used without further purification. BIM synthesis: Indole (99+%, Aldrich, St. Louis, MO, USA); 4-Nitrobenzaldehyde (>99%, Aldrich); Dichloromethane (>99%, Aldrich); Acetone (>99.5%, Honeywell, Charlotte, NC, USA); Acetonitrile (>99.5%, puriss. p.a., ACS reagent, reag. Ph. Eur., Aldrich); Chloroform (99.8%, ACS, Alfa Aesar, Haverhill, MA, USA); Diethyl ether (RPE-For analysis-ACS, Carlo Erba Reagents, Cornaredo, Italy); Ethanol (96–97.2%, Honeywell); Ethyl Acetate (>99.7% Chromasolv, Sigma-Aldrich, St. Louis, MO, USA); 2-methyltetrahydrofuran (99%, Alfa Aesar); Toluene (>99.5% ACS Reagent, Sigma-Aldrich).
Aerogel catalyst synthesis: tetraethoxysilane ((Si(OC2H5)4, Aldrich 98%, TEOS); Urea ((NH2CONH2), Sigma-Aldrich (99.0–100.5%); Absolute Ethanol (CH3CH2OH, Carlo Erba); Nitric Acid (HNO3, Carlo Erba); Iron (III) nitrate nonahydrate (Fe(NO3)3·9H2O, Sigma-Aldrich 98%); Manganese (II) nitrate hexahydrate Mn(NO3)2·6H2O, Sigma-Aldrich, ≥98%); Nickel (II) nitrate hexahydrate Ni(NO3)2·6H2O, Sigma-Aldrich, ≥97%).
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2

Temperature-Dependent UV-Vis-NIR Spectroscopy

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The steady state absorption spectra were measured using a UV-vis-NIR absorption spectrometer (UV-3600 Plus, Shimadzu). The temperature dependent absorption spectra were obtained using a homemade system comprising the UV-3600Plus absorption spectrometer, a cryostat (OptistatCF2, Oxford Instruments), an electronic temperature controller (MercuryiTC, Oxford Instruments) and a vacuum pump. The temperature was adjusted between 295 K and 78 K, and the sample was dissolved in 2-methyltetrahydrofuran (99%, Alfa Aesar), which can form a clear glass at low temperatures.
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