Bimetallic derivatives of the [M(en)3]3+ ion (M=Cr and Co): A series of compounds with unusual magnetic and structural properties (abstract)

Fernando Palacio, M. Carmen Morón, J. Pons, J. Casabó, X. Solans, K. E. Merabet, D. Huang, X. Shi, Boon K. Teo, Richard L. Carlin

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Abstract

The crystal structure and magnetic susceptibility of a series of [M(en)3]3+ (M=Cr or Co) derivatives are described. In particular, the crystalline structures of (1) [Cr(en) 3]3[FeCl6]Cl6·H2O, (2) [Co(en)3]3[FeCl6]Cl6· H2O, and (3) [Cr(en)3][FeCl6]·11H 2O are reported. Structural data, in Å, for these compounds are as follows: (1) space group R3, a=15.447(4), c=21.060(6), Z=3; (2) space group R3, a=15.346(3), c=20.880(5), Z=3; (3) space group P3c1, a=11.654(3), c=15.508(4), Z=2. The main structural feature of the first two isomorphous materials is that they consist of a three-dimensional network of triangular antiprisms formed by the [M(en)3]3+ (M=Cr or Co) ions and connected with each other by sharing corners. An [FeCl 6]3- ion is placed at the center of each antiprism. Compound (3) contains a sc arrangement of [Cr(en)3] 3+ and [FeCl6]3- octahedra. In addition, the magnetic susceptibilities of the above-mentioned isomorphous compounds and of [M(en)3][FeCl6] (M=Cr and Co) and [Cr(en)3][InCl6] are reported. While [Cr(en) 3]3[FeCl6]Cl6·H2O orders as a ferrimagnet at 0.91 K, [Cr(en)3][FeCl6] exhibits antiferromagnetic properties with Tc=2.26 K, a temperature rather similar to the antiferromagnetic ordering temperature of [Co(en) 3][FeCl6].
Original languageEnglish
Pages (from-to)6017
JournalJournal of Applied Physics
Volume67
Issue number9
DOIs
Publication statusPublished - 1 Dec 1990

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