English   español  
Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/128725
Share/Impact:
Statistics
logo share SHARE logo core CORE   Add this article to your Mendeley library MendeleyBASE

Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL | DATACITE
Exportar a otros formatos:

Title

Bimetallic derivatives of [M(en)3]3+ ions (M = Cr, Co): An approach to intermolecular magnetic interactions in molecular magnets

AuthorsMorón, M. Carmen; Palacio, Fernando; Pons, Josefina; Casabó, Jaume ; Solans, X.; Merabet, K. Eddine; Carlin, Richard L.
Issue Date1994
PublisherAmerican Chemical Society
CitationInorganic Chemistry 33(4): 746-753 (1994)
AbstractThe crystal and molecular structures together with the magnetic susceptibilities of a series of [M(en)3]3+ (M = Cr, Co) derivatives are reported. The space group and unit cell dimensions of [Cr(en)3]3[FeCl6]Cl6·H 2O (1), [Co(en)3]3[FeCl6]Cl6·H 2O (2), and [Cr(en)3] [FeCl4]Cl2·9H2O (3) are as follows: (1) R3, a = 15.445(4) Å, c = 21.060-(6) Å, Z = 3; (2) R3, a = 15.346(3) Å, c = 20.880(5) Å, Z = 3; (3) P3c\, a = 11.654(3) Å, c = 15.508(4) Å, Z = 2. The trigonal crystal structures contain discrete [M(en)3]3+ (M = Cr, Co), [FeCl6]3-, and Cl- ions and water molecules. With no covalent bonds connecting the iron and chromium (or cobalt) sublattices, the complex cations, anions, and water molecules are held together by ionic forces and by a three-dimensional network of hydrogen bonds. The magnetic susceptibilities of 1,2, [M(en)3] [FeCl6] (M = Cr, Co), and [Cr(en)3] [InCl6] are also reported. While 1 orders as a ferrimagnet at 0.91 K, with Jfe-Cr/kB = -0.153 K, JFe-Fe/kB = -0.044 K, and JCr-Cr/kB = -0-045 K, [Co(en)3] [FeCl6] exhibits antiferromagnetic properties below Tc = 1.43 K and [Cr(Cn)3][FeCl6] evidences antiferromagnetic-like (compensated ferrimagnetic) ordering with (dx/dT)max = 2.26 K. The data were interpreted in terms of the interaction Hamiltonia H = -2Σi<jJijSi·Sj. Structural and magnetic properties are correlated by investigating the superexchange pathways through which the magnetic moments interact and magnetic ordering is established. As a result, hydrogen bonds are shown to be an effective mechanism to propagate magnetic interactions in these molecular magnets. © 1994 American Chemical Society.
URIhttp://hdl.handle.net/10261/128725
DOI10.1021/ic00082a021
Identifiersdoi: 10.1021/ic00082a021
issn: 0020-1669
e-issn: 1520-510X
Appears in Collections:(ICMA) Artículos
(ICMAB) Artículos
Files in This Item:
File Description SizeFormat 
accesoRestringido.pdf15,38 kBAdobe PDFThumbnail
View/Open
Show full item record
Review this work
 

Related articles:


WARNING: Items in Digital.CSIC are protected by copyright, with all rights reserved, unless otherwise indicated.