A phosphate–phosphonate of titanium(IV) prepared from phosphonomethyliminodiacetic acid: characterisation, n-alkylamine intercalation and proton conductivity
✍ Scribed by Enrique Jaimez; Gary B Hix; Robert C.T Slade
- Publisher
- Elsevier Science
- Year
- 1997
- Tongue
- English
- Weight
- 510 KB
- Volume
- 97
- Category
- Article
- ISSN
- 0167-2738
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✦ Synopsis
A titanium(IV) phosphate-phosphonate has been prepared from phosphonomethyliminodiacetic acid [H O PCH N(CH CO H) , H PMIDA]. It is poorly crystalline and can be formulated as 2 3 2 2 2 2 4 [Ti (PO )(H PMIDA)(HPMIDA)(H O)] ? nH O, Ti(PMIDA) [P:Ti 5 1.5:1; n varies with relative humidity, RH]. 2 4 2 2 2
Carboxylic acid groups are present in the interlayer region. Sorptiometry shows the material to be non-porous. Ti(PMIDA) reacts with n-alkylamines to form intercalates and is a proton conductor with conductivity strongly dependent on RH and 21 21
temperature. Observed conductivities span nine orders of magnitude (s 5 8 3 10 S cm for RH 5 100%).