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  Global Journal of Inorganic Chemistry. Volume 2, Issue 3 (2011) pp. 150-156
  Research Article
A new discrete tetranuclear manganese(II) complex containing isonicotinic acid N-oxide: synthesis, structure, and characterizations
  Ling Xua, Xiu-Cheng Zhangb,Wen-Guang Liub, Bing Liua,c  
a REQUIMTE & Department of Chemistry and Biochemistry, Faculty of Sciences, University of Porto, 4169-007 Porto, Portugal
b College of Science, Northeast Forestry University, 150040 Harbin, Heilongjiang, P. R. China
c Department of Chemistry, University of Aveiro, CICECO, Campus Universitario de Santiago, 3810-193 Aveiro, Portugal

  A new tetranuclear manganese(II) complex, [Mn4(INO)63-OH) )2(H2O) 8](BF4)6•2H2O (1) (INO = isonicotinic acid N-oxide), was obtained from the hydrothermal reaction of Mn(BF4)2with INO. The structural analysis indicates that four Mn(II) centers are bridged by carboxyl group and µ3-OH- to form a [Mn4(INO) 63-OH) 2 (H2O) 8]6+ subunit, and further grow into a 3D supramolecular architecture through hydrogen bondings. The oxidation states of manganese and oxygen atoms are confirmed by bond-valence-sum calculations and accord with the charge balance. The energy gap assessed from the diffuse reflectance spectra is 3.17 eV, showing 1 behaves as wide bandgap semiconductor.
  Manganese(II); Isonicotinic acid N-oxide; Crystal structure; Diffuse reflectance spectrum  

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