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A series of novel 3d–4f heterometallic complexes involving pyrimidine‐substituted nitronyl nitroxide radicals with the formula {[Ln(hfac) 3 ] 2 [Cu(hfac) 2 ] 3 (NIT‐Pyrim) 2 (H 2 O) 2 } [Ln III = Gd ( 1 ), Ho ( 2 ), Er ( 3 ); NIT‐Pyrim = 2‐(5‐pyrimidinyl)‐4,4,5,5‐tetramethylimidazoline‐1‐oxyl‐3‐oxide] have been isolated and characterized in terms of structure and magnetism. These 2p–3d–4f compounds consist of Cu II 3 Ln III 2 pentanuclear clusters in which two NIT‐Pyrim radicals act as µ 3 bridges. All compounds display ferromagnetic interactions between the radicals and metal ions. Slow magnetic relaxation was observed in the Ho complex, which represents the first example of a radical–Ho cluster exhibiting magnetic relaxation behavior.
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Li et al. (2017) studied this question.
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