Influence of diamagnetic chelating ligand (L) on spin exchange coupling in heterospin chain complexes, [Cu(L)2NOpy2]n

Kensuke Murashima, Satoru Karasawa, Kenji Yoza, Noboru Koga

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Abstract

The mixtures of dipyridine aminoxyl, NOpy2, and chelated copper complexes, Cu(L)2; L = trifluoroacetylacetonato (tfac), hexafluoroacetylacetonato (hfac), and decafluoroheptanedionato (dfhd), in 1:1 ratios gave polymeric complexes, formulated as [Cu(L)2(NOpy 2)]n; L = tfac (1), hfac (2), and dfhd (3). X-ray crystallography for 1, 2, and 3 revealed that the magnetic coupler NOpy 2 coordinated with the copper ions in trans configurations to form one-dimensional chain structures. Noticeably, complex 2 showed a unique crystal structure that was analyzed as a static disorder of cis and trans configuration of the pyridine ring. The bond lengths of Cu-Npy for 1, 2, and 3, were 2.40, 2.14, and 2.02 Å, respectively and became shorter with increasing the number of fluorine substituents. In the complexes, the aminoxyl centers ferromagnetically interacted with the copper ion. The spin exchange coupling constants, JCu-NO/kB, for 1, 2, and 3, depended on the diamagnetic chelating ligands and were estimated to be 5.7, 32, and 55 K, respectively.

Original languageEnglish
Pages (from-to)188-193
Number of pages6
JournalPolyhedron
Volume66
DOIs
Publication statusPublished - Apr 22 2013

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Exchange coupling
spin exchange
Chelation
Copper
Ligands
copper
ligands
Ions
Fluorine
X ray crystallography
Bond length
configurations
Pyridine
couplers
crystallography
fluorine
pyridines
ions
Crystal structure
disorders

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

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Influence of diamagnetic chelating ligand (L) on spin exchange coupling in heterospin chain complexes, [Cu(L)2NOpy2]n. / Murashima, Kensuke; Karasawa, Satoru; Yoza, Kenji; Koga, Noboru.

In: Polyhedron, Vol. 66, 22.04.2013, p. 188-193.

Research output: Contribution to journalArticle

Murashima, Kensuke ; Karasawa, Satoru ; Yoza, Kenji ; Koga, Noboru. / Influence of diamagnetic chelating ligand (L) on spin exchange coupling in heterospin chain complexes, [Cu(L)2NOpy2]n. In: Polyhedron. 2013 ; Vol. 66. pp. 188-193.
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