Cover Picture: Spectroscopic and Computational Characterizations of Alkaline‐Earth‐ and Heavy‐Metal‐Exchanged Natrolites (ChemPlusChem 8/2014). Issue 8 (18th July 2014)

• Record Type: Journal Article
• Authors: Liu, Dan; Chen, Xin; Ma, Yanming; Liu, Zhenxian; Vogt, Thomas; Lee, Yongjae
• Is Part Of: ChemPlusChem. Volume 79:Issue 8(2014:Aug.)
• Page Start: 1065
• Page End: 1065
• Publication Date: 2014-07-18
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1002/cplu.201402164
• Languages: English
• ISSNs: 2192-6506

Abstract

<abstract abstract-type="graphical" xml:lang="en"> <title> <x xml:space="preserve">Abstract</x> </title> <p> <bold>The cover picture shows</bold> the natrolite framework of a small‐pore zeolite made up of alternating SiO<sub>4</sub> and AlO<sub>4</sub> tetrahedral 4‐rings and helical 8‐rings, which can contain, via cooperative rotation of the 4‐rings and subsequent modification of the 8‐ring opening, monovalent alkali metals Li<sup>+</sup>, Na<sup>+</sup>, K<sup>+</sup>, Rb<sup>+</sup> and Cs<sup>+</sup>, divalent alkaline‐earth ions Ca<sup>2+</sup>, Sr<sup>2+</sup> and Ba<sup>2+</sup> as well as heavy metals like Cd<sup>2+</sup>, Pb<sup>2+</sup> and Ag<sup>+</sup> as charge‐balancing extra‐framework cations (EFC). In their Full Paper on <ext-link ext-link-type="doi" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink">on page 1096 ff.</ext-link>, Y. Lee and co‐workers report that the vibrational frequencies of both 4‐ and helical 8‐ring units scale with the size of the EFC and that the frequency of the HOH bending and OH stretching modes of water contained within the pores are dependent on the orientations of the water molecules along the natrolite channel. Deviations from these correlations in mixed EFC natrolites could hint at new structures owing to size‐driven phase separations.<boxed-text content-type="graphic" position="anchor" orientation="portrait"><graphic position="anchor" mimetype="image" xlink:href="ark:/27927/pgh11nhrksq" orientation="portrait" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink" /></boxed-text></p> </abstract>