Structural, spectroscopic and theoretical studies on 3,4,7,8-tetramethyl-1,10-phenantroline complex with picric acid

Structure and Tunneling Splitting Spectra of Methyl Groups of Tetramethylpyrazine in Complexes with Chloranilic and Bromanilic Acids

“…In our measurements the activation energy value, E 01 , for Peak 2 (±3.7 μeV; see Figure ) is equal to 14.5 meV and is almost 1.6 times larger than that presented by Prager et al, however, for the peak at 29 μeV (3 K). In our case, it was impossible to estimate the activation energy for the peak at 31 μeV (2 K) since it disappears below 20 K. Nevertheless, the value of E 01 estimated by us for Peak 2 is still larger than that found for similar compounds. ,, The lack of the tunneling splitting observation in the TMP BRA complex is due most probably to the stronger interaction of the C–H methyl group with oxygen atoms, and the size of splitting is too small. The splitting signals most probably undergo an overlapping with the central elastic peak.…”

“…High-resolution inelastic neutron backscattering was applied to find scattering function, S ( Q ,ω), where hQ is momentum transfer and ℏω energy transfer for the molecular complexes of TMP CLA and TMP BRA in the temperature range between 2 and 50 K. The single-particle model used for description of the CH 3 group rotation has been presented by Press and in the paper devoted to the molecular complex of Phen PA (1:2) …”

“…Tunneling results for (a) TMP CLA complex at several temperatures and (b) TMP BRA complex at 3 K in the energy range ± 30 μeV. The fitting procedure has been performed in an analogous way as it was described in ref (see also Supporting Information). …”

Charge-transfer chemistry of azithromycin, the antibiotic used worldwide to treat the coronavirus disease (COVID-19). Part II: Complexation with several π-acceptors (PA, CLA, CHL)

“…1b ). PA is a strong organic acid and the most frequently used acceptor investigated in CT interactions [ 23 , 32 , 44 , 53 , 105 , 116 , 117 , 125 , [143] , [144] , [145] , [146] , [147] , [148] , [149] , [150] , [151] , [152] , [153] , [154] , [155] , [156] , [157] , [158] , [159] , [160] , [161] , [162] , [163] ]. CLA and CHL are interesting from a biological perspective as benzoquinone derivatives.…”

SPHERES: Backscattering spectrometer

“…The high count rates allow inelastic temperature scans (Häußler et al, 2011) and real-time kinetic experiments (Léon & Wuttke, 2011). Further applications are hyper ne splitting in magnetic materials (Chatterji et al, 2008) and rotational tunneling (Bator et al, 2013). …”