Cyclic Water Hexamers and Decamers in a Porous Lanthanide-Organic Framework: Correlation between Some Physical Properties and Crystal Structure
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- 作者：Adonis Michaelides ; Stavroula Skoulika ; Evangelos G. Bakalbassis ; and Jerzy Mrozinski
- 刊名：Crystal Growth & Design
- 出版年：2003
- 出版时间：July 2003
- 年：2003
- 卷：3
- 期：4
- 页码：487 - 492
- 全文大小：167K
- 年卷期：v.3,no.4(July 2003)
- ISSN：1528-7505
文摘
Erbium fumarate [Er2(fum)3(H2O)4]·8H2O, 1, (fum = fumarate dianion) crystallizes at room temperature in a silica gel column. The structure is three-dimensional and consists of layers of erbium fumarate pillaredby fumarate dianions acting in the bis-chelating mode. The layers contain arrays of erbium cations bridged byfumarate dianions acting in the bis-bidentate bridging mode. The relatively large channels formed in the directionof the a and c axes are filled by water molecules that form a hydrogen bonded layer, comprising cyclic hexamerswith both boat and chair conformations and cyclic decamers with boat-chair-boat conformation. The water moleculesare reversibly removed at 90 
C. The evacuated metal-organic framework, 2, is stable up to 400 C. Both compounds1 and 2 exhibit weak antiferromagnetic interactions.
C. The evacuated metal-organic framework, 2, is stable up to 400 C. Both compounds1 and 2 exhibit weak antiferromagnetic interactions.