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Solvent Modulated Assembly of Two Ni(II) Complexes: Syntheses, Structures and Magnetic Properties
Author(s) -
Vinayak Richa,
Harinath A.,
GómezGarcía Carlos J.,
Panda Tarun K.,
Benmansour Samia,
Nayek Hari Pada
Publication year - 2016
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201601385
Subject(s) - chemistry , nickel , crystallography , thermal stability , schiff base , thermogravimetric analysis , crystal structure , ligand (biochemistry) , solvent , recrystallization (geology) , ion , ferromagnetism , magnetic susceptibility , organic chemistry , paleontology , biochemistry , physics , receptor , quantum mechanics , biology
A dinuclear [Ni 2 (L) 2 (DMSO) 2 (MeOH) 2 ] ( 1 ) and a tetra‐nuclear [Ni 4 (L) 4 (DMF) 2 (H 2 O) 2 ] . DMF ( 2 ) Ni(II) complexes have been prepared by treating nickel nitrate hexahydrate with the Schiff base ligand H 2 L ( H 2 L =(E)‐2‐(2‐hydroxybenzyliden)amino‐4‐nitrophenol) in a one‐pot reaction. Complex 1 was obtained after recrystallization of the precipitate from the reaction with a 1:1:1 mixture of DMSO/CH 2 Cl 2 /MeOH. In contrast, the tetrameric complex 2 was obtained after slow evaporation of the filtrate. Both complexes were characterized by analytical, thermogravimetric, optical and magnetic techniques. The solid state molecular structures of 1 and 2 were determined by single crystal X‐ray crystallography. Complex 1 shows a dinuclear structure whereas complex 2 shows a defective dicubane structure. The magnetic properties of complex 1 show a predominant ferromagnetic coupling between the Ni(II) ions with J =+16.1 cm −1 and 2 shows a predominant Ni−Ni antiferromangetic interaction of J =‐15.5 cm −1 . Both coupling constants are the expected ones from magneto‐structural correlations. The thermal stability and optical properties of both complexes have also been investigated.