Inorganic Chemistry, Vol.59, No.17, 11894-11900, 2020
Slow Magnetic Relaxation of a 12-Metallacrown-4 Complex with a Manganese(III)-Copper(II) Heterometallic Ring Motif
The heterobt.metalli.c metallacrown (MC), (TMA)2{Mn(0Ac)2[12-MCm (;;;)c (;;)N(,;,1)-4](CH30 1-1 I)}-2.90CH,30tetramethylammonium,1,where TMA+ is tetramethylamonium, -0Ac is acetate, and shi311 is salicylhydroximate, consists of a Mn;I ion capturedn the central cavity and alternating unambiguous and ordered manganese(III) and copper(II) sites about the MC ring, a first for the archetypal MC structure design. DC-magnetoinetry characterization and, subsequent simulation with the Spin Hamiltonian H = T ( + s).s j (s + s) I 4_ is.s + d(s 2 + s 32) i,t,Eis:__lgisi"B indicates an S = 5. /2. ground state. and. a sizable axialzero-J S 3 -5 2 2 4 'S5, 3 I +1 z1; 1 1 field splitting on Mn". AC -susceptibility measurements reveal that 1 displays slow magnetization relaxation akin to single -molecule magnet (SM114) behavior.