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  • Chen, C. N. (author)

Aggregate manganese Schiff base moieties by terephthalate or acetate : Dinuclear manganese and trinuclear mixed metal Mn-2/Na complexes

  • Article/chapterEnglish2003

Publisher, publication year, extent ...

  • 2003-04-29
  • American Chemical Society (ACS),2003
  • printrdacarrier

Numbers

  • LIBRIS-ID:oai:DiVA.org:kth-22534
  • https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-22534URI
  • https://doi.org/10.1021/ic025944zDOI
  • https://lup.lub.lu.se/record/309592URI

Supplementary language notes

  • Language:English
  • Summary in:English

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  • Subject category:ref swepub-contenttype
  • Subject category:art swepub-publicationtype

Notes

  • QC 20100525
  • A reaction system consisting of terephthalic acid, NaOH, inorganic Mn(II) or Mn(III) salt, and salicylidene alkylimine resulted in dinuclear manganese complexes (salpn)(2)Mn-2(mu-phth)(CH3OH)(2) (1, salpn = N,N'-1,3-propylene-bis(salicylideneiminato); phth = terephthalate dianion), (salen)(2)Mn-2(mu-phth)(CH3OH)(2) (2, salen = N,N'-ethylene-bis(salicylideneiminato)), (salen)(2)Mn-2(mu-phth)(CH3OH)(H2O) (3), and (salen)(2)Mn-2(mu-phth) (4), while the absence of NaOH in the reaction led to a mononuclear Mn complex (salph)Mn(CH3OH)(NO3) (5, salph = N,N'-1,2-phenylene-bis(salicylideneiminato)). In addition, a trinuclear mixed metal complex H{Mn2Na(salpn)(2)(mu-OAc)(2)(H2O)(2)}(OAc)(2) (6) was obtained from the reaction system by using maleic acid instead of terephthalic acid. Five-coordinate Mn ions were found in 4 giving rise to an intermolecular interaction and constructing a one-dimensional linear structure. Antiferromagnetic exchange interactions were observed for 1-3, and a total ferromagnetic exchange of 4 was considered to stem from intermolecular magnetic coupling. H-1 NMR signals of phenolate ring and alkylene (or phenylene) backbone of the diamine are similar to those reported in the literature, and the phth protons are at -2.3 to -10.1 ppm. Studies on structure, bond valence sum analysis, and magnetic properties indicate the oxidation states of the Mn ions in 6 to be +3, which are also indicated by ESR spectra in dual mode. Ferromagnetic exchange interaction between the Mn(III) sites was observed with J = 1.74 cm(-1). A quasireversible redox pair at -0.29V/0.12V has been assigned to the redox of Mn-2(III)/Mn(III)Mn(II), implying the intactness of the complex backbone in solution.

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Added entries (persons, corporate bodies, meetings, titles ...)

  • Huang, D. G. (author)
  • Zhang, X. F. (author)
  • Chen, F. (author)
  • Zhu, H. P. (author)
  • Liu, Q. T. (author)
  • Zhang, ChunxiLund University,Lunds universitet,Kemiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Department of Chemistry,Departments at LTH,Faculty of Engineering, LTH(Swepub:lu)biok-czh (author)
  • Liao, D. Z. (author)
  • Li, L. (author)
  • Sun, Licheng C. (author)
  • Kemiska institutionenInstitutioner vid LTH (creator_code:org_t)

Related titles

  • In:Inorganic Chemistry: American Chemical Society (ACS)42:11, s. 3540-35480020-16691520-510X

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