Publication Date:
2015-09-22
Description:
The dinucleating ligand (1,4,7,10-tetraazacyclododecane-1,4,7,10-tetrayl)-tetrakis-(methylene)-tetrakis(2-methoxy-4-methylphenol), H 4 L, is well preorganized with an N 4 O 2 octahedral site for a divalent transition metal ion and an O 4 site (phenolates and methoxo donors, completed by added pivalates and solvent molecules) for lanthanide ions. Two 3d-4f complexes ([Dy III {Ni II (μ-H 2 L)}piv 2 (OH 2 )]ClO 4 and [Dy III {Co II (μ-H 2 L)}piv 2 (OH 2 )]ClO 4 ) were prepared and fully characterized by X-ray molecular structures and electronic properties determined by ac and dc SQUID magnetometry. While the Ni II based complex shows single-molecule magnetism (SMM), the Co II complex does not. With an extensive quantum-chemical analysis, this is shown to be due to a misalignment of the single ion anisotropies in the latter complex, and reasons for this are discussed.
Print ISSN:
0044-2313
Electronic ISSN:
1521-3749
Topics:
Chemistry and Pharmacology
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