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Abstract
Photoreaction of guest organic anions in layered organic-inorganic hybrid materials was investigated. The layered hybrids were synthesized by an anion-exchange reaction of [LiAl 2 (OH) 6 ]Cl.yH 2 O layered double hydroxide with aqueous (Z,Z)- and (E,E)-muconates under inert atmospheric condition, to give new organic-inorganic hybrids of [LiAl 2 (OH) 6 ] 2 [(Z,Z)-C 6 H 4 O 4 ].zH 2 O and [LiAl 2 (OH) 6 ] 2 [(E,E)-C 6 H 4 O 4 ].zH 2 O, respective-ly. The basal spacings calculated by XRPD of intercalates indicate that muconate anions have almost vertical arrangements against the host [LiAl 2 (OH) 6 ] + lattices in the interlayer of organic-inorganic hybrid materials. When UV light was irradiated on the suspension of [LiAl 2 (OH) 6 ] 2 [(Z,Z)-C 6 H 4 O 4 ].zH 2 O, the (Z,Z)-muconate anions of the gallery space of hybrids were polymerized in the aqueous media while it was isomerized into more stable (E,E)-muconate in the methanollic suspension in the presence of catalytic amount of molecular iodine. All the products were characterized using elemental analysis, TGA, XRPD, FT-IR, 1 H NMR and 1 3 C CP-MAS NMR.
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