英语翻译
A combination band,νas+νs,is observed at 2462 cm-1.Two
other bands appear at 1242 cm-1 and 1105 cm-1,most easily
seen in the low pressure range (see inset of Figure 3),which
are substantially more red-shifted compared to the gas phase
values (-120 and -53 cm-1,respectively) than these of the previous
bands discussed above.SO2 adsorption also induces
significant changes to the frameworks vibrational modes:(1) a
blue shift of the νas(COO) mode from 1639 cm-1 to 1695 cm-1
(\3ν = +56 cm-1) and of the νs(COO) mode from 1433 cm-1 to
1472 cm-1 (\3ν = +39 cm-1),and (2) a decrease in intensity of
νas(CH2),νs(CH2) and ν(CH) modes at 2874 cm-1,2938 cm-1,
and 3076 cm-1,respectively.Furthermore,the CH2 rocking
mode and benzene ring deformation mode σ 12 are red-shifted
by -8 cm-1 (from 830 and to 822 cm-1) and -12 cm-1 (from
744 cm-1 to 732 cm-1).The δ(COO) mode,initially at 810 cm-1
shifts to 778 cm-1 (\3ν = -32 cm-1).These changes increase with
SO2 adsorption.The frameworks vibrational modes assignment
is summarized in Table S3.Figure 3.IR absorption spectra of SO2 adsorption into
Ni(bdc)(ted)0.5 as a function of SO2 initial pressure recorded
immediately after evacuation (within 16 s).All spectra are
referenced to the activated (i.e.empty) MOF.Inset shows the low
pressure region from bottom to top:600 mtor,1 Torr,2 Torr,3
Torr.The black lines are associated with SO2-related features and
the red dash lines with MOF-related features arising from SO2
induced perturbation.