Multiple-layer heterometallic MnII–AgI coordination polymers constructed from [Ag 2 I (CN)3]− and [AgI(CN)2]− units

Dicyanometallates as Model Extended Frameworks

We report the structures of eight new dicyanometallate frameworks containing molecular extra-framework cations. These systems include a number of hybrid inorganic–organic analogues of conventional ceramics, such as Ruddlesden–Popper phases and perovskites. The structure types adopted are rationalized in the broader context of all known dicyanometallate framework structures. We show that the structural diversity of this family can be understood in terms of (i) the charge and coordination preferences of the particular metal cation acting as framework node, and (ii) the size, shape, and extent of incorporation of extra-framework cations. In this way, we suggest that dicyanometallates form a particularly attractive model family of extended frameworks in which to explore the interplay between molecular degrees of freedom, framework topology, and supramolecular interactions.

A novel one-dimensional metal-organic framework with a μ-cyanido-argentate group: catena-poly[[(5,5'-dimethyl-2,2'-bipyridyl-κ(2)N,N')silver(I)]-μ-cyanido-κ(2)N:C]

The design and synthesis of metal coordination and supramolecular frameworks containing N-donor ligands and dicyanidoargentate units is of interest due to their potential applications in the fields of molecular magnetism, catalysis, nonlinear optics and luminescence. In the design and synthesis of extended frameworks, supramolecular interactions, such as hydrogen bonding, π-π stacking and van der Waals interactions, have been exploited for molecular recognition associated with biological activity and for the engineering of molecular solids.The title compound, [Ag(CN)(C12H12N2)]n, crystallizes with the Ag(I) cation on a twofold axis, half a cyanide ligand disordered about a centre of inversion and half a twofold-symmetric 5,5'-dimethyl-2,2'-bipyridine (5,5'-dmbpy) ligand in the asymmetric unit. Each Ag(I) cation exhibits a distorted tetrahedral geometry; the coordination environment comprises one C(N) atom and one N(C) atom from substitutionally disordered cyanide bridging ligands, and two N atoms from a bidentate chelating 5,5'-dmbpy ligand. The cyanide ligand links adjacent Ag(I) cations to generate a one-dimensional zigzag chain. These chains are linked together via weak nonclassical intermolecular interactions, generating a two-dimensional supramolecular network.

The heterometallic cadmium–silver complexcis-bis[dicyanidoargentato(I)-κN]bis(5,5′-dimethyl-2,2′-bipyridyl-κ2N,N′)cadmium(II) monohydrate

In the title complex, [Ag2Cd(CN)4(C12H12N2)2]·H2O orcis-[Cd{Ag(CN)2}2(5,5′-dmbpy)2]·H2O, where 5,5′-dmbpy is 5,5′-dimethyl-2,2′-bipyridyl, the asymmetric unit consists of a discrete neutral [Cd{Ag(CN)2}2(5,5′-dmbpy)2] unit and a solvent water molecule. The CdIIcation is coordinated by two bidentate chelate 5,5′-dmbpy ligands and two monodentate [AgI(CN)2]−anions, which are in acisarrangement around the CdIIcation, leading to an octahedral CdN6geometry. The overall structure is stabilized by a combination of intermolecular hydrogen bonding, and AgI...AgIand π–π interactions, forming a three-dimensional supramolecular network.