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    • Keywords


      Manganese(III) pyridinedicarboxylate; metal reduction potential; protic redistribution

    • Abstract


      The reaction of Mn(CH3COO)3 2H2O with the carboxyl-rich ligand pyridine-2,6-dicarboxylic acid (H2L) in methanol affords a high-spin (S = 2) hydratedbis-complex. Structure determination has revealed the solid to be [MnIII(H2 L)(L)] [MnIIIL2] 5H2 O: space group P−1;Z = 2;a = 7.527(3)Å3,b= 14.260(4)Å,c = 16.080(6)Å,α = 91.08(3)°,β = 103.58(3)°,γ= 105.41(3)° andV= 1611.2(10)Å3. Each ligand is planar and is bonded in the tridentate O2N fashion. The MnO4N2 coordination spheres show large distortions from octahedral symmetry. The lattice is stabilised by an extensive network of O…O hydrogen-bonding involving water molecules and carboxyl functions. Upon dissolution in water, protic redistribution occurs and the complex acts as the mono-basic acid Mn(HL)(L) (pK, 4.3 ±0.05). The deprotonated complex displays high metal reduction potentials: MnIVL2-MnIIIL2, 1.05V; MnIIIL2MnIIL22−-, 0.28V vs. SCE

    • Author Affiliations


      Swapan Kumar Chandra1 Partha Chakraborty1 Animesh Chakravorty1

      1. Department of Inorganic Chemistry, Indian Association for the Cultivation of Science, Calcutta - 700032, India
    • Dates

  • Journal of Chemical Sciences | News

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