An advanced NMR protocol for the structural characterization of aluminophosphate glasses.

An advanced NMR protocol for the structural characterization of aluminophosphate glasses. Research Abstract Details 

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An advanced NMR protocol for the structural characterization of aluminophosphate glasses. Abstract Text:

Leo , Tricot,Sebastian Wegner,Leo , Tricot,Sebastian Wegner,Leo , Tricot,Sebastian Wegner,

In this work a combination of complementary advanced solid-state nuclear magnetic resonance (NMR) strategies is employed to analyse the network organization in aluminophosphate glasses to an unprecedented level of detailed insight. The combined results from MAS, MQMAS and (31)P-{(27)Al}-CP-heteronuclear correlation spectroscopy (HETCOR) NMR experiments allow for a detailed speciation of the different phosphate and aluminate species present in the glass. The interconnection of these local building units to an extended three-dimensional network is explored employing heteronuclear dipolar and scalar NMR approaches to quantify P-O-Al connectivity by (31)P{(27)Al}-heteronuclear multiple quantum coherence (HMQC), -rotational echo adiabatic passage double resonance (REAPDOR) and -HETCOR NMR as well as (27)Al{(31)P}-rotational echo double resonance (REDOR) NMR experiments, complemented by (31)P-2D-J-RESolved MAS NMR experiments to probe P-O-P connectivity utilizing the through bond scalar J-coupling. The combination of the results from the various NMR approaches enables us to not only quantify the phosphate units present in the glass but also to identify their respective structural environments within the three-dimensional network on a medium length scale employing a modified Q notation, Q(n)(m),(AlO)(x), where n denotes the number of connected tetrahedral phosphate, m gives the number of aluminate species connected to a central phosphate unit and x specifies the nature of the bonded aluminate species (i.e. 4, 5 or 6 coordinate aluminium).

An advanced NMR protocol for the structural characterization of aluminophosphate glasses. Publishing Authors By Initials

L ,G Tricot,S Wegner,L ,G Tricot,S Wegner,L ,G Tricot,S Wegner,

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An advanced NMR protocol for the structural characterization of aluminophosphate glasses. Journal Published:

PUBLICATION TYPE: Research Support, Non-U.S. Gov

Journal: Solid state nuclear magnetic resonance

VOLUME: 32

Page Numbers: 44-52

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ISSN: 0926-2040

DAY: 15

MONTH: 08

YEAR: 2007

An advanced NMR protocol for the structural characterization of aluminophosphate glasses. Information

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LANGUAGE: eng

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AFFILIATION: Institut für Physikalische Chemie, Westfälische Wilhelms-Universität Münster, Correnstrasse 30-36, 48149 Münster, Germany. wullen@uni-muenster.de

Country: Netherlands

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MEDLINETA: Solid State Nucl Magn Reson

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