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Aggregate manganese...
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 ...
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2003-04-29
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American Chemical Society (ACS),2003
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printrdacarrier
Numbers
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LIBRIS-ID:oai:DiVA.org:kth-22534
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https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-22534URI
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https://doi.org/10.1021/ic025944zDOI
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https://lup.lub.lu.se/record/309592URI
Supplementary language notes
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Language:English
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Summary in:English
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Classification
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Subject category:ref swepub-contenttype
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Subject category:art swepub-publicationtype
Notes
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QC 20100525
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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.
Subject headings and genre
Added entries (persons, corporate bodies, meetings, titles ...)
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Huang, D. G.
(author)
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Zhang, X. F.
(author)
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Chen, F.
(author)
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Zhu, H. P.
(author)
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Liu, Q. T.
(author)
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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)
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Liao, D. Z.
(author)
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Li, L.
(author)
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Sun, Licheng C.
(author)
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Kemiska institutionenInstitutioner vid LTH
(creator_code:org_t)
Related titles
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In:Inorganic Chemistry: American Chemical Society (ACS)42:11, s. 3540-35480020-16691520-510X
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Chen, C. N.
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Huang, D. G.
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Zhang, X. F.
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Chen, F.
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Zhu, H. P.
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Liu, Q. T.
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Zhang, Chunxi
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Liao, D. Z.
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Li, L.
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Sun, Licheng C.
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Chemical Science ...
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Inorganic Chemis ...
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Royal Institute of Technology
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Lund University