We previously reported the measurement of rates of electron transfer (ET) by the coalescence of vibrational absorption bands in infrared (IR) spectra. [1,2] To observe the coalescence of vibrational bands in IR spectra, rates of chemical exchange

A pyrazine bridged dimer of triruthenium clusters [{RuIII2RuII(μ3-O)(μ-CH3CO2)6(CO)(abco)}2(μ-pz)] (abco =1-azabicyclo[2,2,2]octane, pz = pyrazine) gives an inter-cluster mixed valence state upon one electron reduction. The splitting of the reduction waves in cyclic voltammetry, ΔE, was 470 mV. This corresponds to a comproportionation constant for formation of the mixed valence state of 9.0 × 107. The IR spectrum of the mixed valence species in the ν(CO) region, measured by reflectance IR spectroelectrochemistry, showed a completely coalesced ν(CO) band. This represents delocalized redox behavior on the infrared vibrational timescale. The rate constant for intramolecular electron transfer was estimated to be 1 × 1012 s-1 at -18 °C by simulating the ν(CO) absorption bandshape. The mixed valence complex showed an intervalence charge transfer (ICT) band at 12500 cm-1. Hush analysis provides a spectroscopic estimate of HAB to be 2490 cm-1. Crystal structures of [{RuIII2RuII(μ3-O)(μ-CH3CO2)6(CO)(abco)}2(μ-pz)]·2CH2Cl2 and its precursor, [RuIII2RuII(μ3-O)(CH3CO2)6(CO)(abco)2]·CH2Cl2, were determined by X-ray crystallography. Trends in Ru-O(oxo) and Ru-O(acetate) distances in these compounds show that the divalent site is localized on the Ru center attached to the carbonyl ligand.

We previously reported the measurement of rates of electron transfer (ET) by the coalescence of vibrational absorption bands in infrared (IR) spectra. [1,2] To observe the coalescence of vibrational bands in IR spectra, rates of chemical exchange

An efficient flow system was constructed for the synthesis of [6,6]‐phenyl‐C61‐butyric acid methyl ester (PCBM); the process involved flow [2+1] addition of C60 and subsequent flow photoisomerization of the resulting fulleroid to PCBM by using a flow photoreactor in combination with an Na lamp. With the present flow system, a scalable synthesis of PCBM (0.79 g/3.3 h) was achieved by continuous operation for 3.3 h.

The Cover Feature shows the one‐flow synthesis of [6,6]‐phenyl‐C61‐butyric acid methyl ester (PCBM), which involves flow [2+1] addition of C60 with diazoalkane and subsequent flow photoisomerization of the resulting fulleroid to PCBM by using a flow photoreactor in combination with a Na lamp. The two‐step reactions proceeded within a residence time of 3 min, and a scalable synthesis of PCBM was achieved by continuous operation (0.79 g/3.3 h). More information can be found in the https://doi.org/10.1002/ejoc.201700745