SMM behaviour of heterometallic dinuclear CuIILnIII (Ln = Tb and Dy) complexes derived from N2O3 donor unsymmetrical ligands. (5th April 2020)

• Record Type: Journal Article
• Authors: Maity, Souvik; Bhunia, Pradip; Ichihashi, Kana; Ishida, Takayuki; Ghosh, Ashutosh
• Is Part Of: New journal of chemistry. Volume 44:Number 16(2020)
• Page Start: 6197
• Page End: 6205
• Publication Date: 2020-04-05
• Subjects: Chemistry -- Periodicals; Chimie -- Périodiques; 540
• DOI: 10.1039/d0nj00193g
• Languages: English
• ISSNs: 1144-0546

Abstract

Abstract : Four heterometallic dinuclear Cu II Ln III (Ln = Tb and Dy) complexes derived from two different N2 O3 donor unsymmetrical Schiff base ligands exhibit SMM behaviour. Abstract : Complexes [CuL 1 ] (1 ) and [CuL 2 ] (2 ) of two unsymmetrical N2 O3 donor ligands (where H2 L 1 and H2 L 2 are N -salicylidene- N ′-3-ethoxysalicylidene-1, 3-propanediamine and N -salicylidene- N ′-3-methoxysalicylidene-1, 3-propanediamine, respectively) have been prepared by a facile method. Using these two Cu(ii ) complexes as metalloligands, four new isostructural dinuclear Cu II Ln III complexes [CuL(μ-NO3 )Ln(NO3 )2 (H2 O)]·CH3 CN (for complexes 3 and 4, L = L 1, and Ln = Tb and Dy, while for complexes 5 and 6, L = L 2, and Ln = Tb and Dy, respectively) have been synthesized. In all four isomorphous complexes, the geometry around the corresponding deca-coordinated Ln(iii ) centres is sphenocorona, whereas the penta-coordinated Cu(ii ) centres are square pyramidal. The DC magnetic susceptibility measurements show the presence of ferromagnetic exchange interaction between the Cu(ii ) and Ln(iii ) centres in all four complexes. From the AC measurements, the complexes (3–6 ) exhibit slow magnetic relaxation properties in a DC applied field of 2000 Oe with effective energy barriers of 19.3(8), 26.1(10), 23.8(10) and 28.2(5) K, respectively.