The reaction rate of a catalyzed reaction is faster than the reaction rate of the uncatalyzed reaction at the same temperature. Category: amides-buliding-blocks, 98-10-2, Name is Benzenesulfonamide, SMILES is O=S(C1=CC=CC=C1)(N)=O, in an article , author is Chen Yanjun, once mentioned of 98-10-2.
Infrared spectroscopic and computational studies of Co(ClO4)(2) dissolved in N,N-dimethylformamide (DMF). Vibrations of DMF influenced by Co2+ or ClO4- or both
Infrared (IR) spectroscopy for N,N-dimethylformamide (DMF) shows that the OCN bend (SOCN) and the CO stretch (vCO) vibrations undergo an upshift and a downshift, respectively, on the dissolution of Co(ClO4)(2). Quantum chemical calculations are performed for optimizing the structures and predicting the IR spectra of model complexes for solute species. The calculations reveal that Co2+ exerts a much larger influence than ClO4- on the vibrations of DMF. For Co2+(DMF)(6), in which each DMF molecule is coordinated to Co2+ via the O atom, the Co2+ DMF interaction upshifts the SOCN frequencies (+24 cm(-1) on average) while the dipole coupling gives rise to splitting (12 cm(-1)) of the modes. On the other hand, the Co2+ . . . DMF interaction downshifts the vCO frequencies (-15 cm(-1) on average) while the splitting of the modes amounts to 37 cm(-1). As a result, one of the vCO modes is located at an upshifted position (+13 cm(-1)) despite the O-atom coordination. For six-coordinated isomers of Co2+(DMF)(7), the SOCN and vCO frequencies of the second-sphere DMF are close to those of bulk DMF in neat liquid. The calculations indicate that it is difficult to prove or exclude the formation of contact ion pairs [Co(DMF)(5)ClO4](+) and solvent-shared ion pairs [Co(DMF)(6)ClO4](+) by IR spectroscopy in the SOCN and vCO regions. However, asymmetric ClO stretches of the ClO4- moiety suggest that conceivable is the coexistence of solvent-shared ion pairs only. (C) 2020 Elsevier B.V. All rights reserved.
But sometimes, even after several years of basic chemistry education, it is not easy to form a clear picture on how they govern reactivity! 98-10-2, you can contact me at any time and look forward to more communication. Category: amides-buliding-blocks.