Mapping of the organization of p-nitroaniline in SAPO-5 by second-harmonic generation microscopy.
Second-harmonic generation microscopy (SHGM) has been employed to study crystals of zeolite-like material SAPO-5 filled with p-nitroaniline (PNA). The SHG and 2-photon fluorescence response of PNA in the one-dimensional channels readily reveals the pore accessibility; intergrown crystallites containing hexagonal pyramidal components and internal diffusion barriers are found next to seemingly perfect crystals. The sensitivity of second-harmonic generation to molecular orientation allowed for mapping of the domains of differently organized PNA. Dense domains of highly aligned PNA alternate with dilute zones with loosely aligned PNA.
van der Veen
Monique A
MA
Centre for Surface Chemistry and Catalysis, K. U. Leuven, Kasteelpark Arenberg 23, 3001 Leuven, Belgium.
Van Noyen
Jasper
J
Sels
Bert F
BF
Jacobs
Pierre A
PA
Verbiest
Thierry
T
De Vos
Dirk E
DE