A new approach to the synthesis of heteronuclear propeller-like single molecule magnets

Propeller-like [Fe-4(L)(2)(dk)(6)] complexes, in which Hdk is a beta-diketone and H3L is a tripodal alcohol, R-C(CH2OH)(3), exhibit tunable magnetic anisotropy barriers and retain their magnetic memory effect when chemically anchored on metal surfaces. Heteronuclear analogues of these M-4 complexes have been sought to afford a library of compounds with different total spin (S) values, but synthetic efforts described so far gave solid solutions containing M-4 in addition to the desired M3M' species. We now present a novel synthetic route to M3M' complexes featuring a central chromium(III) ion. The three-step preparation goes through coordination of Cr-III by two equivalents of tripodal alkoxide (R = Et and Ph), followed by reaction of this complex core with the peripheral +III metal ions. Products have been characterised by chemical analyses together with H-1-NMR, FTIR, W-band EPR, DC/AC magnetic susceptibility measurements and single crystal X-ray diffractometry. Due to the chemical inertness of CrIII, this route yields 100% pure Fe3Cr complexes without metal scrambling; what is more, it is suitable for designing novel heteronuclear single molecule magnets (SMMs) with a variety of d- and f-metals and R groups.