Susanta Hazra1, Cyril Rajnák2, Ján Titiš2, M Fátima C Guedes da Silva1, Roman Boča2, Armando J L Pombeiro1,3. 1. Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisbon, Portugal. 2. Department of Chemistry, Faculty of Natural Sciences, University of SS Cyril and Methodius, 91701 Trnava, Slovakia. 3. Peoples' Friendship University of Russia (RUDN University), 6 Miklukho-Maklaya Street, 117198 Moscow, Russia.
Abstract
One-pot reaction of the Schiff base N,N'-ethylene bis(salicylaldimine) (H2L), CoCl2.6H2O, and [Ph2SnCl2] in acetone produces the mixed valence CoIICoIII2 compound [CoIICoIII2(μ-L)2(Ph)2(μ-Cl)2]·(CH3)2CO·H2O (1). Our recent study already revealed that the same reaction mixtures in methanol or ethanol produced a heterometallic SnIVCoIII (2) or monometallic CoIII complex (3), respectively. Comparison of these organometallic systems shows that the 2,1-intermetallic Ph shift occurs in any of those solvents, but their relevant structural features (mononuclear, dinuclear-heterometallic, and trinuclear mixed valence) are solvent dependent. Geometrical structural rotation is also discussed among the related organometallic CoIICoIII2 systems. The AC magnetic susceptibility measurements indicate that 1 is a single molecule magnet (SMM), exhibiting a field-induced slow magnetic relaxation with two modes. The relaxation time for the low-frequency channel is as slow as τ~0.6 s at T = 2.0 K and BDC = 1.0 T.
One-pot reaction of the n class="Chemical">pan class="Chemical">Schiff base pn>an class="Chemical">N,N'-ethylene bis(salicylaldimine) (H2L), CoCl2.6H2O, and [Ph2SnCl2] in acetone produces the mixed valence CoIICoIII2 compound [CoIICoIII2(μ-L)2(Ph)2(μ-Cl)2]·(CH3)2CO·H2O (1). Our recent study already revealed that the same reaction mixtures in methanol or ethanol produced a heterometallic SnIVCoIII (2) or monometallic CoIIIcomplex (3), respectively. Comparison of these organometallic systems shows that the 2,1-intermetallic Ph shift occurs in any of those solvents, but their relevant structural features (mononuclear, dinuclear-heterometallic, and trinuclear mixed valence) are solvent dependent. Geometrical structural rotation is also discussed among the related organometallic CoIICoIII2 systems. The AC magnetic susceptibility measurements indicate that 1 is a single molecule magnet (SMM), exhibiting a field-induced slow magnetic relaxation with two modes. The relaxation time for the low-frequency channel is as slow as τ~0.6 s at T = 2.0 K and BDC = 1.0 T.
Authors: Susanta Hazra; Nuno M R Martins; Maxim L Kuznetsov; M Fátima C Guedes da Silva; Armando J L Pombeiro Journal: Dalton Trans Date: 2017-10-10 Impact factor: 4.390
Authors: Elena A Buvaylo; Vladimir N Kokozay; Olga Yu Vassilyeva; Brian W Skelton; Andrew Ozarowski; Ján Titiš; Beáta Vranovičová; Roman Boča Journal: Inorg Chem Date: 2017-05-30 Impact factor: 5.165
Authors: J Yoo; A Yamaguchi; M Nakano; J Krzystek; W E Streib; L C Brunel; H Ishimoto; G Christou; D N Hendrickson Journal: Inorg Chem Date: 2001-08-27 Impact factor: 5.165