Syntheses, structures and magnetic properties of μ1,5- dicyanamide bridged di- and polynuclear manganese(II) complexes containing neutral N-donor Schiff bases: Control of coordination number and nuclearity by varying denticity

Kishalay Bhar, Sumitava Khan, Sumitra Das, Partha Mitra, Georgina Rosair, Joan Ribas, Barindra Kumar Ghosh

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

Two hexacoordinated dinuclear compounds [Mn(L1)(dca)]2(ClO 4/PF6)2·CH3OH (1/2) and two heptacoordinated coordination polymers [Mn(L2)(dca)]n(ClO 4/PF6)n (3/4) [L1 = N,N'-(bis-(pyridin-2- yl)benzylidene)-1,3-propanediamine; L2 = N,N'-(bis-(pyridin-2-yl) benzylidene)diethylenetriamine; dca = dicyanamide] are synthesized and characterized. Structures of 1-3 have been solved by X-ray diffraction measurements. Each manganese(II) center in 1/2 is located in a distorted octahedral environment with an MnN6 chromophore coordinated by the four N atoms of L1 and two nitrile N atoms of bibridged µ1,5 dca. Interestingly, the coordination polymer 3 forms a 1D chain through single Mn-(NCNCN)-Mn units in which each manganese(II) center adopts a pentagonal bipyramidal geometry with an MnN7 chromophore occupied with five N atoms of L2 and two nitrile N atoms of monobridged µ1,5 dca. Magnetic susceptibility measurements of 1-3 in the 2-300 K temperature range reveal weak antiferromagnetic interactions. © 2010 Elsevier B.V. All rights reserved.

Original languageEnglish
Pages (from-to)3308-3315
Number of pages8
JournalInorganica Chimica Acta
Volume363
Issue number13
DOIs
Publication statusPublished - 25 Oct 2010

Keywords

  • Antiferromagnetism
  • Di-/polynuclear manganese(II)
  • Dicyanamide bridging
  • N-donor Schiff base
  • X-ray structure

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