Homo and heterometallic rhomb-like Ni4 and Mn2Ni 2 complexes

Ritwik Modak, Yeasin Sikdar, Senjuti Mandal, Carlos J. Gómez-García, Samia Benmansour, Sudipta Chatterjee, Sanchita Goswami

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11 Citations (Scopus)

Abstract

Two new polynuclear complexes with hydroxyl-rich Schiff base ligand 3-[(2-Hydroxy-benzylidene)-amino]-propane-1,2-diol (H3L), namely [NiII2(HL)(H2L)(SCN)]2·DMF (1) and [MnIII2NiII2(HL) 2(L)2] (2) have been synthesized and characterized by single crystal X-ray diffraction, elemental analyses, FTIR, UV-Vis spectroscopy and variable temperature magnetic susceptibility measurements. The X-ray refinements reveal that both compounds present defective rhomb-like dicubane central cores (Ni4 in 1 and Mn2Ni2 in 2). Magnetic susceptibility measurements indicate the presence of overall antiferromagnetic exchange interactions in 1 along the side connected by a N and O atoms (J1 = -43.6 cm-1) and along the short diagonal of the rhomb (J3 = -3.9 cm-1) and a weak ferromagnetic coupling (J2 = +5.8 cm-1) along the side of the rhomb connected by a double O-bridge. In 2 the three exchange interactions are negative (J1 = J2 = -0.3 cm-1 and J3 = -0.7 cm-1). A magneto-structural correlation with the ratio between the Ni-O-Mn bond angle and the Mn-O bond length is also discussed for double O-bridged Mn-Ni pairs.

Original languageEnglish
Pages (from-to)155-163
Number of pages9
JournalPolyhedron
Volume70
DOIs
Publication statusPublished - 09-03-2014

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

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