Anion-dependent assembly of Dy complexes: structures and magnetic behaviors?

CrystEngComm Pub Date: 2015-06-01 DOI: 10.1039/C5CE00925A

Abstract

The self-assembly of 2-aldehyde-8-hydroxyquinoline, histamine dihydrochloride and LnX3·6H2O (X? = OAc?, NO3? and ClO4?) affords a series of lanthanide complexes, namely Nd3(nma)2(OAc)7·3CH3OH·0.5H2O (1a), Ln3(nma)2(OAc)7·2CH3OH [Ln = Tb (1b) and Dy (1c)], [Ln(nma)(NO3)2(DMSO)]·CH3OH [Ln = Nd (2a), Tb (2b), Dy (2c) and Er (2d)] and [Dy(nma)2]·ClO4·0.5CH3OH (3) (Hnma = N-(2-(8-hydroxylquinolinyl)methane(2-(4-imidazolyl)ethanamine))). It is noted that the formation and structures of 1–3 are anion-dependent, where diverse coordination modes are detected for acetates in trinuclear 1 as compared to the single coordination mode for nitrates in mononuclear 2. In the case of 3, the Dy3+ ion is completely encapsulated by two ligands with an uncoordinated perchlorate anion balancing the charge. Magnetic measurement shows that the Dy complexes of 1c, 2c and 3 exhibit slow relaxations under zero dc field. It is noted that single-molecule magnet behavior is obtained for 2c and 3 under an applied dc field of 2000 Oe.

Graphical abstract: Anion-dependent assembly of Dy complexes: structures and magnetic behaviors
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