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Magnetostructural effects of changing spin unit structure and molecular connectivity on 1H-benzimidazole functionalized radicals
Polyhedron (2014)
  • Gonca Seber, University of Massachusetts
  • David J R Brook, San Jose State University
  • Patrick S. Taylor, University of Massachusetts
  • Rafael A. Allao Cassaro, University of Massachusetts
  • Paul M. Lahti, University of Massachusetts
Abstract
A single hydrogen bonding molecular assembly unit (benzimidazole = BIm) was used for solid state assembly of different types of radicals connected at different sites on the assembly unit. The effects of changing radical spin unit and molecular connectivity were tested by comparing tetramethylnitronylnitroxide (NN), dimethyloxoverdazyl (mV), and diisopropyloxoverdazyl (iV) spin units attached to BIm at either the 2-position or 5/6-position. The mV systems were not isolated with sufficient purity and stability for crystallographic or magnetic analysis, but chain-type hydrogen bonding was found in the crystal structures of all of the other, stable compounds. Close contacts are induced between radical groups in some cases by the hydrogen bonded chains, giving exchange behavior ranging from essentially isolated spin paramagnetism (BIm2iV) to antiferromagnetic interactions of (−)1–3 K.
Keywords
  • molecular connectivity,
  • benzimidazole functionalized radicals,
  • spin unit structure
Disciplines
Publication Date
2014
Publisher Statement
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Citation Information
Gonca Seber, David J R Brook, Patrick S. Taylor, Rafael A. Allao Cassaro, et al.. "Magnetostructural effects of changing spin unit structure and molecular connectivity on 1H-benzimidazole functionalized radicals" Polyhedron Vol. 76 (2014)
Available at: http://works.bepress.com/david_brook/26/