A NEW ULTRAVIOLET PROTECTIVE AGENT OF THE INTERCALATION COMPOUND OF AMINOBENZOIC ACID-ESTERS (UV ABSORBER) AND SYNTHETIC MICA (INORGANIC LAYERED COMPOUND)
Y. Watanabe et al., A NEW ULTRAVIOLET PROTECTIVE AGENT OF THE INTERCALATION COMPOUND OF AMINOBENZOIC ACID-ESTERS (UV ABSORBER) AND SYNTHETIC MICA (INORGANIC LAYERED COMPOUND), Chemical and Pharmaceutical Bulletin, 45(12), 1997, pp. 2051-2054
The interaction between a sodium-type synthetic mica (Na-TSM), a mater
ial of reactive layered compounds which exhibit characteristic light s
cattering, and some aminobenzoic acid derivatives which act as UV abso
rbing agents (UV absorber), was investigated, Due to the observed elon
gation of interlayer spacing (increase in the d-value) by X-ray diffra
ction analysis, it was found that the powdered form of 4-aminobenzoic
acid ethyl ester (4-ABE) interacts with Na-TSM, and can be immobilized
in the interlayer space of Na-TSM, Consequently, an intercalation com
pound of 4-ABE and Na-TSM was obtained, The formation of the intercala
tion compound of 4-ABE and Na-TSM was accelerated by heat processing,
particularly at temperatures exceeding the melting point of 4-ABE, Whe
n 2-aminobenzoic acid methyl ester (2-ABM) in liquid form at room temp
erature was used instead of 4-ABE, the intercalation compound of 2-ABM
and Na-TSM was formed in a similar manner to that of 4-ABE and Na-TSM
, The heat processing again accelerated the formation of the intercala
tion compound of 2-ABM and Na-TSM, Interestingly, a difference in the
formation behavior of intercalation compounds between 4-ABE and 2-ABM
was observed, The intercalation compound of Na-TSM and 4-ABE or 2-ABM
showed efficient UV absorption in the UVB and UVA wavelength regions,
Therefore, application of a layered compound of Na-TSM and 4-ABE or 2-
ABM as a novel UV screening system is promising.