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Supramolecular assembly of new heteropolymetalic molecules based on tetraiminodiphenolate macrocycle and hexacyanometallate anions: Magnetostructural and spectroscopic properties |
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| Authors: | Rafael Block SamulewskiJú lio Cé sar da Rocha,Rafael StielerErnesto Schulz Lang,David John EvansGiordano Poneti,Otaciro Rangel NascimentoRonny Rocha Ribeiro,Fá bio Souza Nunes |
| Affiliation: | a Departamento de Química, Universidade Federal do Paraná, Cx. Postal 19081, 81531-990 Curitiba, PR, Brazil b Universidade Federal da Fronteira Sul - Campus Realeza, Avenida Rubem Cesar Caselani, no. 3806, 85.770-000 Bairro Cazaca, Realeza, PR, Brazil c Departamento de Química, Universidade Federal de Santa Maria, 97105-900 Santa Maria, RS, Brazil d Department of Biological Chemistry, John Innes Centre, Norwich Research Park, Norwich NR4 7UH, UK e Laboratory of Molecular Magnetism (LAMM), Department of Chemistry, Ugo Schiff and INSTM Research Unit, University of Florence, Via della Lastruccia, 3-13, 50019 Sesto Fiorentino, Florence, Italy f Instituto de Física de São Carlos, Universidade de São Paulo, Cx. Postal 369, 13560-970 São Carlos, SP, Brazil |
| Abstract: | Herein we report on the synthesis, single crystal X-ray structure, spectroscopic and magnetic properties of [{Cu2(tidf)(H2O)}2(μ-CN)2Fe(CN)4]·6H2O (1), [Cu2(tidf)(H2O)2][Ni(CN)4] (2) and [Cu2(tidf)(H2O)2][Fe(CN)5NO]·H2O (3) (tidf = a Robson type macrocyclic ligand obtained on condensation of 2,6-diformyl-4-methylphenol and 1,3-diaminopropane). Complex (1) is pentanuclear; two paramagnetic dicopper(II) units are linked by a hexacyanoferrate(II) ion through two cyano-bridges. All compounds exhibit extensive, three-dimensional, supramolecular structures supported by classic hydrogen bonding between the coordinated aqua ligands, water molecules and cyano groups. Magnetism as a function of the temperature of complexes 1-3 is consistent with a strong antiferromagnetism with exchange parameters 2J estimated −783(29), −913(2), −905(1), respectively. |
| Keywords: | Dicopper(II) Tetraiminodiphenolate Crystal structure Magnetic measurements Electronic structure Supramolecular |
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