abstract
Four new complexes, [NiL(NO3)].CH3OH (1), [Ni2L2(mu-Cl)(2)] (2), [Ni2L2(mu(1,1)-NCO)(2)] (3) and [Ni2L2(mu(1,1)-N-3)(2)] (4) were synthesized from a tetradentate Schiff base (HL), prepared from the condensation reaction of N,N-dimethyldipropylenetriamine and 5-bromosalicylaldehyde. X-ray crystallography reveals that 2-4 are isostructural and isomorphic dinickel(II) compounds with bridging chloride or pseudohalides. All these three dinickel(II) complexes exhibit ferromagnetic interaction through bridging chloride or pseudohalides and their coupling constants are in the order 4>2>3, a replication of the average strength of exchange interactions found in such complexes characterised magnetically. Most importantly, compound 3 is a precious addition to the only four known examples of this family, and unprecedented high degree of structural and magnetic resemblances observed in 2-4 is the major achievement of the present work.
keywords
DINUCLEAR NI(II) COMPLEX; NI-II COMPLEXES; END-ON AZIDO; TRANSITION-METAL-COMPLEXES; MAGNETIC-PROPERTIES; CRYSTAL-STRUCTURE; NICKEL(II) COMPLEXES; EXCHANGE INTERACTIONS; LIGAND; NUCLEARITY
subject category
Chemistry
authors
Patra, M; Brandao, P; Pikul, AP; Adak, S; Panja, A
Groups
acknowledgements
A. P. gratefully acknowledges the financial support of this work by the CSIR, New Delhi, India (Sanction no. 01(2834)/15/EMR-II dated 02/06/15). We are also thankful to Dr. Amrita Saha, Jadavpur University, India for her valuable suggestions.