Ferromagnetic coupling in trinuclear, partial cubane CuII complexes with a μ3-OH core: Magnetostructural correlations

Biswarup Sarkar, Mau Sinha Ray, Yi Zhi Li, You Song, Albert Figuerola, Eliseo Ruiz, Jordi Cirera, Joan Cano, Ashutosh Ghosh*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

70 Scopus citations

Abstract

Three new trinuclear copper(II) complexes, [(CuL1) 33OH)][ClO4]23H2O (1), [(CuL2)33-OH)][ClO4] 2H2O (2), and [(CuL3) 33-OH)][ClO4]27H2O (3) have been synthesized from the three tridentate Schiff bases HL1, HL2, and HL3 (HL1 = 6aminomethyl-3-methyl-1- phenyl-4-azahex-2-en-1-one, HL2 = 6-aminoethyl-3methyl-1 -phenyl-4-azahex-2-en-1 -one, and HL3 = 6-aminodimethyl-3-methyl1- phenyl-4-azahex-2-en-1-one). They have been characterized by X-ray crystallography and IR and UV spectroscopy, and their magnetic properties have been investigated. All the compounds contain a partial cubane [Cu 3O4] core consisting of the trinuclear unit [(CuL) 33-OH)]2+, Perchlorate ions, and water molecules. In each of the complexes, the copper atoms are fivecoordinate with a distorted square-pyramidal geometry except complex 1, in which one of the CuII of the trinuclear unit is weakly coordinated to one of the Perchlorate ions. Magnetic measurements performed in SQUID MPMS-XL7 using polycrystalline samples at an applied field of 2 kOe indicate a global intramolecular ferromagnetic coupling. Magnetostructural correlations have been calculated on the basis of theoretical models without symmetry restriction. Continuous shape measurements are an appropriate tool for establishing the degree of distortion of the CuII from squareplanar geometry. Structural, theoretical, and experimental magnetic data indicate that the higher the degree of distortion, the greater the ferromagnetic coupling.

Original languageEnglish (US)
Pages (from-to)9297-9309
Number of pages13
JournalChemistry - A European Journal
Volume13
Issue number33
DOIs
StatePublished - Dec 4 2007

Keywords

  • Copper
  • Magnetic properties
  • Schiff bases
  • Structure elucidation
  • Tridentate ligands

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Organic Chemistry

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