Polymetallic clusters of iron(III) with derivatised salicylaldoximes

Ian A. Gass, Constantinos J. Milios, Anna Collins, Fraser J. White, Laura Budd, Simon Parsons, Mark Murrie, Spyros P. Perlepes, Euan K. Brechin

Research output: Contribution to journalLiterature reviewpeer-review

Abstract

The synthesis and magnetic properties of the compounds [HNEt3][Fe-2(OMe)(Ph-sao)(2) (Ph-saoH)(2)]center dot 5MeOH (1.5MeOH), [Fe3O(Et-sao)(O2CPh)(5)(MeOH)(2)]center dot 3MeOH (2.3MeOH), [Fe-4(Me-sao)(4)(Me-saoH)(4)] (3), [HNEt3](2)[Fe6O2(Me-sao)(4)(SO4)(2)(OMe)(4)(MeOH)(2)](4), [Fe8O3(Me-sao)(3)(tea)(teaH)(3)(O2CMe)(3)] (5), [Fe8O3(Et-sao)(3)(tea)(teaH)(3)(O2CMe)(3)] (6), and [Fe8O3(Ph-sao)(3)(tea)(teaH)(3)(O2CMe)(3)] (7) are reported (Me-saoH(2) is 2'-hydroxyacetophenone oxime, Et-saoH(2) is 2'-hydroxypropiophenone oxime and Ph-saoH(2) is 2-hydroxybenzophenone oxime). 1-7 are the first Fe-III compounds synthesised using the derivatised salicylaldoxime ligands, R-saoH(2). 1 is prepared by treatment of Fe-2(SO4)(3)center dot 6H(2)O with Ph-saoH(2) in the presence of NEt3 in MeOH; 2 prepared by treatment of Fe(ClO4)(2)center dot 6H(2)O with Et-saoH(2) and NaO2CPh in the presence of NEt4OH in MeOH; 3 prepared by treatment of Fe(ClO4)(2)center dot 6H(2)O with Me-saoH(2) and NaO2CCMe3 in the presence of NEt4OH in MeOH; and 4 prepared by treatment of Fe-2(SO4)(3)center dot 6H(2)O with Me-saoH(2) in the presence of NEt3 in MeOH. 4 is a rare example of a polynuclear iron complex containing a coordinated SO42- ion. Compounds 5-7 are prepared by treatment of Fe(O2CMe)(2) with Me-saoH(2) (5), Et-saoH(2) (6), Ph-saoH(2) (7) in the presence of H(3)tea (triethanolamine) in MeOH, and represent the largest nuclearity Fe-III clusters containing salicyladoxime-based ligands, joining a surprisingly small family of characterised octanuclear Fe complexes. Variable temperature magnetic susceptibilty measurements of 1,3 and 5-7 reveal all five complexes possess S = 0 spin ground states; 2 possesses an S = 1/2 spin ground state, while 4 has an S = 4 +/- 1 spin ground state.

Original languageEnglish
Pages (from-to)2043-2053
Number of pages11
JournalDalton Transactions
Issue number15
DOIs
Publication statusPublished - 21 Apr 2008

Keywords

  • SINGLE-MOLECULE MAGNETS
  • CRYSTAL-STRUCTURE
  • MAGNETOSTRUCTURAL CORRELATIONS
  • COORDINATION CHEMISTRY
  • MODEL COMPLEXES
  • KAGOME LATTICE
  • IRON SULFATES
  • LIGANDS
  • TETRANUCLEAR
  • HEXANUCLEAR

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