Three heterometallic hexanuclear 3d-4f complexes bearing the formula [Cu (L) Ln (L) (o-van) ] [L=2-((E)-((2-hydroxyphenyl)imino]methyl)phenol; o-van=ortho-vanillin] (Ln =Gd (1), Dy (2), and Tb (3)) have been synthesized and characterized. DC magnetic susceptibility measurements reveal overall antiferromagnetic interactions in 1 and 3, whereas co-existence of ferro- as well as antiferromagnetic interactions were observed in 2. The magnetocaloric effect has been observed for 1 with an entropy change (-ΔS ) of 22.3 J kg  K at 3 K and 7 T. Zero-field single molecule magnet (SMM) behaviour has been observed for 2, where Raman relaxation and quantum tunneling of magnetization (QTM) played a role in magnetization relaxation. The Cu-O-Ln angle well explains the magnetic exchange coupling occurring in the complexes. BS-DFT calculation for the complexes provides an estimate of the exchange interactions between the paramagnetic centres. Ab initio calculations performed for complex 2 established a good correlation to the experimental relaxation dynamics.

Download full-text PDF

Source
http://dx.doi.org/10.1002/asia.202200622DOI Listing

Publication Analysis

Top Keywords

heterometallic hexanuclear
8
smm behaviour
8
antiferromagnetic interactions
8
hexanuclear [cu
4
complexes
4
[cu complexes
4
complexes showing
4
showing zero-field
4
zero-field smm
4
behaviour magnetocaloric
4

Similar Publications

Want AI Summaries of new PubMed Abstracts delivered to your In-box?

Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!