Shaping Solid-State Supramolecular Cavities: Chemically Induced Accordionlike Movement ofγ-Zirconium Phosphate Containing Polyethylenoxide Pillars

Abstract

The hydrophilic oxygen atoms of polyethylenoxide chains inserted as pillars in gamma-zirconium phosphate form hydrogen bonds with the acid groups of the host. As a result the pillars are almost perpendicular to the gamma layers. Upon changing the pH level of the supernatant solution the hydrogen bonds are broken and the pillars become almost perpendicular to the layers (shown schematically). Thus there is a reversible enlargement-shortening of the interlayer space.

β-[H2N(CH2)2NH2]0.5[ZnHPO3], a second modification of ethylenediamine zinc hydrogen phosphite

“…In principle, this arrangement represents an unusual kind of microporosity, with the channels bounded by both inorganic and organic surfaces. However, in (I), unlike the case of organically pillared zirconyl phosphates (Alberti et al, 1999), the presence of the PÐH bond protruding into the channel region and the steric bulk of the ethylenediamine moieties means that there is no possibility of ingress by other chemical species. Finally, the ethylenediamine ±NH 2 groups in (I) participate in NÐHÁ Á ÁO hydrogen bonds (Table 2), all of which are close to linear (mean HÐHÁ Á ÁO = 172 ).…”

Structural characterization of Cd3(O3PC2H4CO2)2·2H2O from in-house X-ray powder data and NMR

“…Metal phosphonates have been extensively studied because of their potential applications in catalysis (Clearfield, 1996(Clearfield, , 1998aSharma & Clearfield, 2000;Sharma et al, 2001;Maillet et al, 2001), ion exchange (Alberti, 1996;Alberti et al, 1997Alberti et al, , 1999Clearfield, 1984Clearfield, , 1988Clearfield, , 1995, proton conductivity (Alberti et al, 1992;Bujoli et al, 1990;Le Bideau et al, 1994;Fredoueil et al, 1998;Odobel et al, 2001;Stein et al, 1996), gas and liquid separations (Riou et al, , 2000Serpaggi & Ferey, 1998;Adair et al, 2001), biology (Nonglaton et al, 2004), and organic molecule sorption Yang, 1986;Clearfield, 1998b). The choice of the ligand is very important to accomplish the desired properties.…”

Solid‐State Reshaping of Crystals: Flash Increase in Porosity of Zirconium Phosphate‐Hypophosphite That Contains Polyethylenoxa Diphosphonate Pillars

“…The synthesis of pentaethylenglycol diphosphonic acid, and the pillaring procedure were previously described 14. Material I (0.3 g) was dispersed in a 0.1 M water solution (30 mL) of methylammonium chloride.…”