Magnetic phase transition and magnetic bistability in oxamato-based CoIICuII bimetallic MOF thin films

Abstract Thin films of an anionic oxamato-bridged cobalt(II)-copper(II) 3D MOF have been growth at 120 °C in DMSO through a one-pot reaction from Co(NO 3 ) 2 ·6H 2 O and (Me 4 N) 2 [Cu(2,6-Et 2 pa) 2 ]·6H 2 O (2,6-Et 2 pa = N -2,6-diethylphenyloxamate) over Si(111) surfaces functionalized with carboxylic acid terminating groups. These heterobimetallic Co II 2 Cu II 3 MOF thin films ( 2 ) of about ten nanometers thickness show a ferrimagnetically ordered phase below ca. 10 K with a relatively large magnetic hysteresis similar to that of the bulk material of formula (Me 4 N) 2 [Co 2 Cu 3 (2,6-Et 2 pa) 6 ]·5H 2 O ( 1 ).