화학공학소재연구정보센터
Journal of the American Chemical Society, Vol.137, No.22, 7160-7168, 2015
Covalently Linked Dimer of Mn-3 Single-Molecule Magnets and Retention of Its Structure and Quantum Properties in Solution
[Mn3O(O2CMe)(3)(dpd)(3/2))](2)(I-3)(2) has been obtained from the reaction of 1,3-di(pyridin-2-yl)propane-1,3-dione dioxime (dpdH(2)) with triangular [(Mn3O)-O-III(O2CMe)(py)(3)](ClO4). It comprises two.[(Mn3O)-O-III](7+) triangular units linked covalently by three dioximate ligands into a [Mn,], dimer. Solid state dc and ac magnetic susceptibility measurements reveal that each Mn-3 subunit of the dimer is a separate single-molecule magnet (SMM) with an S = 6 ground state and that the two SMM units are very weakly ferromagnetically exchange coupled. High-frequency EPR spectroscopy on a single crystal displays signal splittings indicative of quantum superposition/entanglement of the two SMMs, and parallel studies on MeCN/toluene (1:1) frozen solutions reveal the same spectral features. The dimer thus retains its structure and inter-Mn-3 coupling upon dissolution. This work establishes that covalently linked molecular oligomets of exchange-coupled SM.Ms can be,prepared that retain their oligomeric nature and attendant inter-SMM quantum mechanical coupling in solution, providing a second phase for their study and demonstrating the feasibility of using solution methods for their deposition on surfaces and related substrates for study.