Isolation of four new CoII/CoIII and NiII complexes with a pentadentate Schiff base ligand: Syntheses, structural descriptions and magnetic studies

Sambuddha Banerjee, Madhusudan Nandy, Soma Sen, Sandip Mandal, Georgina M. Rosair, A. M Z Slawin, Carlos J. Gómez García, Juan M. Clemente, Ennio Zangrando, Nicol Guidolin, Samiran Mitra

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Abstract

In this paper we report the temperature and pH dependent syntheses and systematic characterization of four new CoII/CoIII and NiII complexes with a pentadentate Schiff base ligand H3L obtained by condensing 1,3,-diaminopropan-2-ol with 2-hydroxyacetophenone in 1:2 molar ratio. The room temperature syntheses involving CoII and NiII nitrates and the ligand H3L lead to the isolation of the dinuclear species [Co2L2(H2O)] (1), and the mononuclear complex [Ni(LH)] (3), respectively, whereas refluxing at basic pH leads to the tetranuclear complexes, [CoII2Co III2L23-OMe) 2(NO3)(H2O)2]NO3· 2(H2O) (2), and [Ni4L23-OMe) 2(H2O)2]·2H2O (4). 1 is found to be a simple mono alkoxo-bridged CoIII dinuclear species, whereas 2 and 4 are both rhomb-like tetrameric complexes with double oxo bridges and µ3-methoxo bridges, derived from the methanol solvent, in an open dicubane arrangement. Moreover 2 shows six coordinate ordered CoII and CoIII ions and 4 has both six- and five-coordinate Ni II centers. Compound 3 is assigned a tentative mononuclear structure based on IR, UV-Vis spectroscopic, 1H-NMR and ESI mass study results and is supposed to have one NiII center coordinated with a ligand fragment in square planar geometry. The variable temperature magnetic susceptibility study for 2 and 4 is performed which indicate for both 2 and 4 the presence of intracluster dominant ferromagnetic interactions. © 2011 The Royal Society of Chemistry.

Original languageEnglish
Pages (from-to)1652-1661
Number of pages10
JournalDalton Transactions
Volume40
Issue number8
DOIs
Publication statusPublished - 28 Feb 2011

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    Banerjee, S., Nandy, M., Sen, S., Mandal, S., Rosair, G. M., Slawin, A. M. Z., Gómez García, C. J., Clemente, J. M., Zangrando, E., Guidolin, N., & Mitra, S. (2011). Isolation of four new CoII/CoIII and NiII complexes with a pentadentate Schiff base ligand: Syntheses, structural descriptions and magnetic studies. Dalton Transactions, 40(8), 1652-1661. https://doi.org/10.1039/c0dt00923g