Hiroyuki Morioka

Preparation of New Inorganic—Organic Layered Compounds, Hydroxy Double Salts, and Preferential Intercalation of Organic Carboxylic Acids into Them

Abstract New inorganic—organic layered compounds were prepared by ion-exchange reactions of zinc-nitrate and copper-nitrate HDSs with organic carboxylic acids whose interlayer spacings increased depending on the sizes of carboxylic acids. The amounts of ion-exchanged 2-naphthoic acid and 2,6-naphthalene dicarboxylic acid were larger than those of 1-naphthoic acid and 2, 7-naphthalene dicarboxylic acid, respectively, indicating the molecule recognition ability of the HDSs.

New preparation method for surface-modified inorganic layered compounds

New surface-modified inorganic layered compounds have been prepared by the reaction of Zn(OH)2 with organic oxychlorides in which 71–98% of the OH groups reacted. Their layered structures are similar to those of the layered double hydroxides (LDHs). Although LDHs have cationic charges, the reaction products are uncharged. The interlayer spacings of the reaction products were 8.3–14.8 A for the products of Zn(OH)2 with dioxychlorides, and 11.9–16.7 A for the reaction products of Zn(OH)2 with monooxychlorides, depending on the lengths of the organic compounds.

Surface modification of inorganic layer compound with organic compound and preparation of thin films

Abstract Water treated Zn Al layered double hydroxide (LDH) was prepared by the reaction of LDH oxide and water. By the reaction of the water treated Zn Al LDH or amorphous metal hydroxide and organic oxychloride, surface modified inorganic layer compounds were prepared. Their layer structures were similar to those of the orginal LDHs except the reaction product of amorphous metal hydroxide and benzoyl chloride. Interlayer spacings of the reaction products were 0.77 to 2.67 nm depending on the size and number of function groups of organic compounds.

Preparation of novel covalently linked organic derivatives of layered double hydroxides

Abstract Treatment of the calcined Zn Al layered double hydroxide (LDH) with degassed water gave a new compound whose surface was covered by hydroxyl groups. By the reactions of such water-treated Zn Al LDHs with organic acid chlorides, the formation of new intercalation compounds, in which organic compounds were covalently linked to the inner surface of the Zn Al LDH, was confirmed.