Abstract
Two spin crossover (SCO) coordination polymers assembled by combining FeII octahedral ion, 4-cyanopyridine (4-CNpy) and [Au(CN)2]− liner unit are described. These compounds, Fe(4-CNpy)2[Au(CN)2]2·1/2(4-CNpy) (1a) and {Fe(4-CNpy)2[Au(CN)2]2}-{Fe(H2O)2[Au(CN)2]2} (1b), present quite different supramolecular networks that show different magnetic behaviors. Compound 1a crystallizes in the centrosymmetric space group Pbcn. The asymmetric unit contains two 4-CNpy, one type of Fe2+, and two types of crystallographically distinct [Au(CN)2]− units which form Hofmann-like two dimensional layer structures with guest spaces. The layers are combined with another layer by strong gold-gold intermetalic interactions. Compound 1b crystallizes in the centrosymmetric space group Pnma. The bent bismonodentate [AuI(CN)2] units and FeII ions form a complicated interpenetrated three dimensional structure. In addition, 1b exhibits ferromagnetic interaction.
Highlights
The designing of supramolecular networks is essential for practical spin crossover (SCO)materials [1,2,3,4]
Crystallographic data have been deposited with Cambridge Crystallographic Data Centre: Deposition numbers CCDC-1869343 for compound 1a
The crystal structure of 1a at 298 K crystallized in the orthorhombic centrosymmetric space group
Summary
The designing of supramolecular networks is essential for practical spin crossover (SCO). {FeII (L)2 [MI (CN)2 ]2 }n [8,9,10,11,12,13,14,15,16] (MI = Ag, or Au, L = monodentate pyridine derivatives) have been developed These compounds show an almost similar bilayer structure because of their strongly determinate self-assembly process in which they link octahedral metal centers through the N atoms of the bidentate [Au(CN)2 ]− unit with strong aurophilic interaction between layers. This structural constancy enables us to precisely modify its crystal structure and properties.
Sign-in/Register to view highlights & summary 
Published Version (
Free)
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call