Syntheses, crystal structures, magnetic properties and ESI-MS studies of a series of trinuclear CuIIMIICuII compounds (M = Cu, Ni, Co, Fe, Mn, Zn)

Nairita Hari, Shuvankar Mandal, Arpita Jana, Hazel Sparkes, Sasankasekhar Mohanta

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Abstract

Six trinuclear CuIIMIICuII compounds (M = Cu, Ni, Co, Fe, Mn, Zn) derived from the Schiff base ligand, H2L (2+1 condensation product of salicylaldehyde and trans-1,2-diaminocyclohexane) are reported in this investigation. The composition of the metal complexes are [{CuIIL(ClO4)}2CuII(H2O)]·2H2O (1), [{CuIIL(ClO4)}{NiII(H2O)2}{CuIIL}]ClO4·CH3COCH3 (2), [{CuIIL(ClO4)}{CoII(CH3COCH3)(H2O)}{CuIIL(CH3COCH3}]ClO4 (3) and isomorphic [{CuIIL(ClO4)}2MII(CH3OH)2] (4, M = Fe; 5, M = Mn; 6, M = Zn). Two copper(II) ions in 1–6 occupy N2O2 compartments of two L2–, while the second metal ion occupies the O(phenoxo)4 site provided by the two ligands, i.e., the two metal ions in both CuIIMII pairs are diphenoxo-bridged. ESI-MS positive of 1–6 reveal some interesting features. Variable-temperature and variable-field magnetic studies reveal moderate or weak antiferromagnetic interactions in 1–6 with the following values of magnetic exchange intergrals (H = –2JS1.S2 type): J1 = –136.50 cm–1 and J = 0.00 for the CuIICuIICuII compound 1; J1 = –22.16 cm–1 and J = –1.97 cm–1 for the CuIINiIICuII compound 2; J1 = –14.78 cm–1 and J = –1.86 cm–1 for the CuIICoIICuII compound 3; J1 = –6.35 cm–1 and J = –1.17 cm–1 for the CuIIFeIICuII compound 4; J1 = –6.02 cm–1 and J = –1.70 cm–1 for the CuIIMnIICuII compound 5; J = –2.25 cm–1 for the CuIIZnIICuII compound 6 (J is between two CuII in the N2O2 compartments; J1 is between CuII and MII through diphenoxo bridge).
Original languageEnglish
Pages (from-to)7315-7329
JournalRSC Advances
Volume8
Issue number14
Early online date14 Feb 2018
DOIs
Publication statusE-pub ahead of print - 14 Feb 2018

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