✦ LIBER ✦

Synthesis and Structure of a New Organic–Inorganic Framework with Tetranuclear Clusters, [Co4(OH)2(H2O)2](C4H11N2)2[C6H2(COO)4]2·3H2O

✍ Scribed by Ray-Kuang Chiang; Niang-Tsu Chuang; Ching-Shuei Wur; Mong-Fu Chong; Chung-Rong Lin

Publisher: Elsevier Science
Year: 2002
Tongue: English
Weight: 595 KB
Volume: 166
Category: Article
ISSN: 0022-4596
DOI: 10.1006/jssc.2002.9573

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✦ Synopsis

A new hybrid organic+inorganic three-dimensional compound, [Co 4 (OH)

has been synthesized via hydrothermal reactions and characterized by single-crystal X-ray di4raction, infrared spectroscopy, thermogravimetric analysis, and magnetic techniques. Compound 1 crystallizes in the monoclinic space group P2 1 /n (no. 14) with a ‫؍‬ 6.3029(9) A s , b ‫؍‬ 16.413(2) A s , c ‫؍‬ 17.139(2) A s , ‫,3)2(036.89؍‬ V ‫؍‬ 1735.0(4) A s 3 , Z ‫؍‬ 2. Compound 1 contains tetranuclear Co 4 ( 3 -OH) 2 (H 2 O) 2 clusters that are inter-linked by pyromellitate bridging ligands into a three-dimensional structure containing one-dimensional tunnels along the a-axis with water and pendant monoprotonated piperazine molecules in the center. The variable temperature magnetic susceptibility was measured from 2 to 300 K at 5000 Oe showing a predominantly antiferromagnetic interaction in 1, and the 5eld dependence of magnetization was measured at 2, 5, 15, and 20 K indicating the competition of magnetic interactions in the tetranuclear centers.

Elsevier Science (USA)

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