Articles written in Journal of Chemical Sciences

    • One-dimensional manganese(III) and iron(III) coordination polymers assembled by N2O2-donor Schiff bases and 4,4Ꞌ-bipyridine: syntheses, structures and properties


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      Reactions of Mn(ClO4)2.6H2O and Fe(ClO4)3.6H2O with the tetradentate N2O2-donor Schiffbases N,NꞋ-bis(salicylidene)-ortho-phenylenediamine and N,NꞋ-bis(salicylidene)ethylenediamine (H2salophenand H2salen, where 2 Hs represent the two dissociable phenolic protons), respectively and the bridging ligand4,4Ꞌ-bipyridine (bipy) in presence of triethyl amine in methanol under ambient conditions produce onedimensional coordination polymers {[Mn(salophen)(μ-bipy)]ClO4}n (1) and {[Fe(salen)(μ-bipy)]ClO4}n (2)in ~60% yields. Both complexes have been characterized by elemental analysis and spectroscopic (IR andDR) measurements. The linear polymeric structures of 1 and 2 have been confirmed by single-crystal X-raycrystallography. The metal centres in these polymers are in distorted octahedral N4O2 coordination spheres.Each of the two dibasic tetradentate ligands (salophen2- and salen2-) forms an ONNO square-plane aroundthe metal centre, while the two axial coordination sites are occupied by N-atoms of the two bridging bipyligands. Variable temperature magnetic susceptibility measurements reveal the high-spin configuration ofmanganese(III) and iron(III) and Curie paramagnetic behaviour of each of the two coordination polymers.

      Facile one-pot syntheses of two new one-dimensional coordination polymers {[Mn(salophen)(μ-bipy)]ClO4}n and {[Fe(salen)(μ-bipy)]ClO4}n have been described. Both polymers were characterised by elemental analyses and solid state spectroscopic and cryomagnetic measurements. Linear chain-like structures of the high-spin Mn(III) and Fe(III) containing Curie paramagnetic polymers were confirmed by single crystal X-ray crystallography.

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