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

Abstract

AbstractThe 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)