2020同步年報

030 ACTIVITY REPORT 2020 with or without Et 3 N; Fig. 2(a) , red and green lines). 3 As soon as the amines were added to the solution of the palladium complex, the changes at the palladium center occurred, indicating that primary amines influence the structure of the palladi- um complex at an early stage. The EXAFS spectra did not match with the first QXAFS scan ( Fig. 2b , blue line) when the phe- nylacetylene was added to the solution without n -butylamine ( Fig. 2b , orange line). Fig. 2 : XAFS Studies. (a) Fourier-transformed EXAFS spectra of experiments ex situ in the presence of n-BuNH 2 , k 2 -weighting, FT range: 3 Å -1 < k < 13 Å -1 Hanning window, dk = 0.5. (b) Fourier- transformed EXAFS spectra of experiments ex situ in the presence of phenylacetylene, k 2 -weighting, FT range: 3 Å -1 < k < 13 Å -1 Hanning window, dk = 0.5. (c) Fourier- transformed EXAFS spectra as a function of time showing the coordination environment of Pd. (d) Normalized Pd K-edge XANES of QXAFS experiments. (e) Pd K-edge EXAFS k 2 -weighted fitting on R space of first scan and corresponding k-space data (inset) (3 Å -1 < k < 12.5 Å -1 and 1.00 Å < R < 2.27 Å). [Repro- duced from Ref. 3]