New Mixed-Metal Aggregates Derived From Dinickel Complexes on a 2-Formylphenolate Template: Counteranion Dependent Formation of 1D Chain and Discrete NaNi2 Complexes

The combination of 2-formylphenol (Hfp) and the dinucleating ligand H3L {2-(2′-hydroxyphenyl)-1,3-bis[4-(2-hydroxyphenyl)-3-azabut-3-enyl]-1,3-imidazolidine} with Ni(NO3)2·6H2O leads to the self-assembly of a Ni2 complex capable of showing anion dependent Na+ coordination. The terminal aqua coordinated [Ni2(fp)L(H2O)]·3H2O (1·3H2O) neutral fragment, formed in the absence of any Na+ source, produces a 1D chain complex [{Ni2(fp)L(N3)(Na)(H2O)}·5H2O]n (2·5H2O)n and a discrete NaNi2 complex [Ni2(fp)L(Na)(H2O)2]·ClO4·H2O (3·ClO4·H2O) through its weak oxophilic interaction with a Na+ cation of the coordinated trisphenolate unit of L3– as observed in metallacrowns. In complexes 2 and 3, the NiII ions are coupled ferromagnetically to yield S = 2 ground states. The magnetic data can be modeled by using the Van Vleck equation incorporating intermolecular interactions. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007)

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