Antiferro- to ferromagnetic crossover in diphenoxido bridged NiII2MnII complexes derived from N2O2 donor Schiff base ligands

Piya Seth, Albert Figuerola, Jesús Jover, Eliseo Ruiz, Ashutosh Ghosh*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

Three new trinuclear NiII-MnII complexes have been synthesized using three different "metalloligands" [NiL1], [NiL2] and [NiL3] derived from the Schiff bases H2L1 = N,N′-bis(salicylidene)-1,3-pentanediamine, H2L2 = N,N′-bis(salicylidene)-1,3-propanediamine and H2L3 = N,N′-bis(salicylidene)-1,3,-diaminopropan-2-ol), respectively. In all three complexes, [(NiL1)2Mn(OOCPh)2(H2O)2]·CH3OH (1), [(NiL2)2Mn(OOCPh)2(CH3OH)2]·CH3OH (2) and [(NiL3)2Mn(OOCPh)2(H2O)2]·CH3OH (3), in addition to the double phenoxido bridge, the two terminal NiII atoms are linked to the central MnII by means of a syn-syn bridging benzoate, giving rise to a linear structure. Complex 1 with Ni-O-Mn angle of 97.35° exhibits antiferromagnetic interactions (JNi-Mn = -0.60 cm-1) whereas ferromagnetic exchange is observed in 2 and 3 (JNi-Mn = +2.00 and +1.10 cm-1 respectively) having Ni-O-Mn angle 97.34° (in 2), 97.27° (in 3). Theoretical calculations have been performed in order to understand the effect of structural parameters that can tune the magnetic properties of this type of complexes such as small differences in the Ni-O-Mn angle and/or slight variations in intermolecular contacts within the crystal.

Original languageEnglish (US)
Pages (from-to)57-63
Number of pages7
JournalPolyhedron
Volume117
DOIs
StatePublished - Oct 15 2016

Keywords

  • Crossover angle
  • Heterometallic complexes
  • Magnetic properties
  • Manganese
  • Nickel

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

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