A Mn(III) single ion magnet with tridentate Schiff-base ligands

作者：Realista S; Fitzpatrick A J; Santos G; Ferreira L P; Barroso S; Pereira L C J; Bandeira N A G; Neugebauer P; Hruby J; Morgan G G; van Slageren J; Calhorda M J; Martinho P N^*

来源：Dalton Transactions, 2016, 45(31): 12301-12307.

DOI：10.1039/c6dt02538b

Single ion magnet behaviour is reported for a mononuclear Mn(III) ion with tridentate Schiff-base ligands which exhibits a tetragonal Jahn-Teller elongation along the N-amine-Mn-N-amine axis and crystallises with two crystallographically distinct Mn(III) cations (unit A and unit B). While magnetic measurements show a large and negative axial zero-field splitting (D = -4.73 cm(-1)), HF-EPR reveal two distinct large axial Ds (D = -4.60 cm(-1) for unit A and D = -4.18 cm(-1) for unit B), thus resulting in the largest D known to date for a Mn(III) single ion magnet. AC magnetic measurements at 2000 Oe allowed determination of the energy barrier for spin reversal (10.19 K) and spin reversal relaxation time (1.476 x 10(-6) s) for the Mn(III) ion. Computational studies were used to characterise the electronic structure and substantiate the zero field splitting in the Mn(III) complex.

• 出版日期2016-8-21