NDLI: Synthesis and single-crystal structure of lead oxide nanoclusters in zeolite Y, |Pb 15.5 2+ (Pb$_{4}$O$_{4}$(Pb 16/19 2+ Pb 3/19 4+ )$_{4}$)$_{4.75}$|[Si$_{117}$Al$_{75}$O$

Content Provider	Springer Nature Link
Author	Seo, Sung Man Su, Hai Kim, Hu Sik Lee, Hyung Joo Lim, Woo Taik
Copyright Year	2013
Abstract	A single crystal of excessively Pb$^{2+}$-exchanged zeolite Y (\|Pb 15.5 2+ (Pb$_{4}$O$_{4}$(Pb 16/19 2+ Pb 3/19 4+ )$_{4}$)$_{4.75}$\|[Si$_{117}$Al$_{75}$O$_{384}$]-FAU) was prepared by exchange of Na–Y (\|Na$_{75}$\|[Si$_{117}$Al$_{75}$O$_{384}$]-FAU, Si/Al = 1.56) with an aqueous stream 0.05 M Pb(C$_{2}$H$_{3}$O$_{2}$)$_{2}$ at 294 K, followed by vacuum dehydration at 1 × 10$^{−6}$ Torr and 693 K. Its structure was determined at 100 K, by X-ray diffraction techniques in the cubic space group Fd $$ \overline{3} $$ m and was refined to the final error indices R $_{1}$/wR $_{2}$ = 0.0639/0.1323. About 53.5 Pb$^{n+}$ ions per unit cell occupy three different equipoints; 26 are at site I′, 19 are at site II, and the remaining 8.5 are at another site II. Three Pb$^{4+}$ ions at some of the positions must have higher oxidation states due to elevated dehydration temperature; Pb(IIa) is supposed to coexist with Pb$^{2+}$ and Pb$^{4+}$ ions assuming the charge balance of the zeolite framework. A distorted Pb$_{4}$O$_{4}$ cube, alternating Pb$^{2+}$ at Pb(I′) and O$^{2−}$ at O(5), coordinates with four Pb$^{2+}$ and/or Pb$^{4+}$ ions through its oxygen atoms to give a [Pb 4 2+ O 4 2− (Pb 16/19 2+ Pb 3/19 4+ )$_{4}$]$^{176/19+}$ cluster in 4.75 of eight sodalite cavities per unit cell in zeolite Y.
Starting Page	1239
Ending Page	1246
Page Count	8
File Format	PDF
ISSN	13802224
Journal	Journal of Porous Materials
Volume Number	20
Issue Number	5
e-ISSN	15734854
Language	English
Publisher	Springer US
Publisher Date	2013-05-09
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Lead Lead oxide cluster Zeolite Y Ion exchange Crystal structure Catalysis Characterization and Evaluation of Materials Physical Chemistry
Content Type	Text
Resource Type	Article
Subject	Mechanics of Materials Materials Science Mechanical Engineering

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