New Developments in Microporous Materials

Abstract

The synthesis, structure, and characterization of microporous materialsin China since 1980 is reviewed. Developments in the areas of aluminosilicates and aluminophosphates, the MIIIXVO4 family, borates, germanates, and titanates are examined, as is the synthesis of large single crystals of zeolites such as the 1,2‐dihydroxybenzene‐containing Si zeolite shown in the Figure.

The preparation of a novel layered lead titanate and its conversion to the perovskite lead titanate PbTiO3

“…Hydrothermal experiments in the PbO-TiO 2 system, working on the Pb-rich side of the system and at conditions of alkaline pH (11.4 -14.2) have previously been reported to give lead titanate perovskite directly [3]. Other groups have reported a microporous lead titanate phase of unidentified structure [4,5] to be prepared hydrothermally at low pH. We report here the synthesis and structure elucidation of a novel lead-and titanium-containing layered solid with oxyanions located between the titanate layers.…”

A new hybrid Dawson-type molybdenum arsenate derivative: (H2bpy)3[As2Mo18O62] (bpy = 4,4′-bipyridine)

“…For the use of polyoxometalates in the construction of functional materials, see: Haushalter et al (1989); Pope & Mü ller (1991). For A/Mo/P/O compounds where A is an organic or inorganic cation, see: Rao et al (2001); Cheetham et al (1999); Thomas & Raja (2001); Xiao et al (1999). For Dawson-type polyoxometalates, see: Wang et al (2004).…”

“…In contrast to the rich structural chemistry of molybdenum phosphates, the Mo/As/O system remains relatively scarcely developed. (Rao et al, 2001;Cheetham et al, 1999;Xiao et al, 1999;Thomas & Raja 2001. )…”

Preparation of microporous organic polymer through Schiff base chemistry and its potential application

“…[29,30,39] Acylation of Schiff bases by acid anhydrides, acid chlorides, and acyl cyanides is initiated by attack at the nitrogen atom and leads to net addition of the acylating agent to the carbon-nitrogen double bond. [19,40] Reactions of this type have been put to good use in natural product synthesis. Schiff bases appear to be an important intermediate in a number of polymer network reactions involving interaction of a primary amine with a carbonyl group of any aromatic compound.…”