S. Vasenkov et H. Frei, UV-VISIBLE ABSORPTION-SPECTROSCOPY AND PHOTOCHEMISTRY OF AN ALKENE-CENTER-DOT-O-2 CONTACT CHARGE-TRANSFER SYSTEM IN LARGE NAY CRYSTALS, JOURNAL OF PHYSICAL CHEMISTRY B, 101(23), 1997, pp. 4539-4543
Single layers of 40 mu m NaY crystals were prepared on a CaF2 support.
These are sufficiently transparent to allow recording of reactants oc
cluded in the zeolite pores by W-visible transmission spectroscopy for
the first time. Spectra of 2,3-dimethyl-2-butene (DMB) and oxygen gas
loaded into the zeolite revealed the true absorption profile of the D
MB . O-2 charge-transfer contact complex. Visible-light-induced reacti
on was monitored by in situ Fourier transform infrared spectroscopy. I
rradiation resulted in the same selective oxidation to 2,3-dimethyl-3-
hydroperoxy-1-butene observed previously in highly scattering pellets
of 1 mu m NaY particles.