Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Structural and Magnetic Properties of Monomeric and Dimeric Copper(II) Complexes with Phenyl-N-[(pyridine-2-yl)methylene]methaneamide

  • Lee, Hong-Woo (Department of Chemistry, Pusan National University) ;
  • Sengottuvelan, Nallathambi (Department of Chemistry Education and Center for Plastic Information System, Pusan National University) ;
  • Seo, Hoe-Joo (Department of Chemistry, Pusan National University) ;
  • Choi, Jae-Soo (Department of Chemistry, Chungnam National University) ;
  • Kang, Sung-Kwon (Department of Chemistry, Chungnam National University) ;
  • Kim, Young-Inn (Department of Chemistry Education and Center for Plastic Information System, Pusan National University)
  • Published : 2008.09.30
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Abstract

The reaction of copper(II) chloride with phenyl-N-[(pyridine-2-yl)methylene]methaneamide (ppmma) leads to a new $\mu$ -chloro bridged dimeric [Cu(ppmma)$Cl_2$]$_2$ complex, whereas a reaction of copper(II) bromide with ppmma affords a monomeric Cu(ppmma)$Br_2$ complex. Both complexes have been characterized by X-ray crystallography and electronic absorption spectroscopy. The crystal structural analysis of [Cu(ppmma)$Cl_2$]$_2$ shows that the two Cu(II) atoms are bridged by two chloride ligands, forming a dimeric copper(II) complex and the copper ion has a distorted square-pyramidal geometry ($\tau$ = 0.2). The dimer units are held through a strong intermolecular $\pi-\pi$ interactions between the nearest benzyl rings. On the other hand, Cu(ppmma)Br2 displayed a distorted square planar geometry with two types of strong intermolecular π-π interaction. EPR spectrum of [Cu(ppmma)$Cl_2$]$_2$ in frozen glas s at 77 K revealed an equilibrium between the mononuclear and binuclear species. The magnetic susceptibilities data of [Cu(ppmma)$Cl_2$]$_2$ and Cu(ppmma)$Br_2$ follow the Curie-Weiss law. No significant intermolecular magnetic interactions were examined in both complexes, and magnetic exchange interactions are discussed on the basis of the structural features.

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References

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