Structure and magnetic properties of carbonate-bridged five-coordinate nickel(II) complexes controlled by solvent effect

CO2 and HCO3- react with the dinuclear hydroxo-complex [Ni(mcN3)(mu-OH)]2(PF6)2 (mcN3 = 2,4,4,9-tetramethyl-1,5,9-triazacyclododec-1-ene) to form micro-CO3 bridged nickel(II) complexes, [{Ni(mcN3)}2(mu-CO3)](PF6)2 (1a) with a symmetric core in which both nickel atoms are five-coordinate and [Ni(mcN3...

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Veröffentlicht in:Dalton transactions : an international journal of inorganic chemistry 2006-01 (32), p.3906-3911
Hauptverfasser: Lozano, A Abel, Sáez, Magalí, Pérez, José, García, Luís, Lezama, Luís, Rojo, Teófilo, López, Gregorio, García, Gabriel, Santana, Ma Dolores
Format: Artikel
Sprache:eng
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Zusammenfassung:CO2 and HCO3- react with the dinuclear hydroxo-complex [Ni(mcN3)(mu-OH)]2(PF6)2 (mcN3 = 2,4,4,9-tetramethyl-1,5,9-triazacyclododec-1-ene) to form micro-CO3 bridged nickel(II) complexes, [{Ni(mcN3)}2(mu-CO3)](PF6)2 (1a) with a symmetric core in which both nickel atoms are five-coordinate and [Ni(mcN3)(mu-CO3)Ni(mcN3)(MeCN)](PF6)2 (1b) with an asymmetric dinuclear core containing five- and six-coordinate nickel atoms. The magnetic behaviour indicates the existence of antiferromagnetic coupling between the metallic centres. A substantial increase in the value of J occurs when the symmetric five-coordinate nickel species transforms to an asymmetric five- and six-coordinate species by axial coordination of acetonitrile.
ISSN:1477-9226
1477-9234
DOI:10.1039/b604541c