Spin switching via targeted structural distortion

C.J. Milios, A. Prescimone, P.A. Wood, S. Parsons, E.K. Brechin, A. Vinslava, W. Wernsdorfer, G. Christou, S.P. Perlepes

Research output: Contribution to journalArticlepeer-review

Abstract

The deliberate "stepwise" structural distortion of the [Mn O(sao)(OCR) L] (S = 4, U = 28 K) family of SMMs (where sao is the dianion of salicylaldoxime or 2-hydroxybenzaldeyhyde oxime and L = MeOH, EtOH) via the use of derivatized oxime ligands and bulky carboxylates leads to a family of single-molecule magnets with larger spin ground states and enhanced blocking temperatures. Replacing sao and HCO in the molecule [MnO (sao)(OCH)(MeOH)] (1), with Et-sao (Et-saoH = 2-hydroxypropiophenone oxime) and MeCCO (pivalate), produces the complex [MnO(Et-sao)(O -CCMe)(EtOH)] (2) that displays an S = 7 ground state with U = 30 K. Replacing Me CCO with PhCO produces the complex [MnO(Et-sao)(O CPh)(EtOH)(HO)] (3) that displays an S = 12 ground state with U = 53 K. The ligand substitution invokes a subtle structural distortion to the core of the molecule evidenced by an increased "twisting" of the oxime moiety (Mn-N-O-Mn) and a change in carboxylate ligation, which, in turn, invokes a dramatic change in the observed magnetic properties by switching weak antiferromagnetic exchange to weak ferromagnetic exchange.
Original languageEnglish
Pages (from-to)6547-6561
Number of pages15
JournalJournal of the American Chemical Society
Volume129
Issue number20
DOIs
Publication statusPublished - 23 May 2007

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