Interpenetrating Copper-Silver Cyanometallate Networks: Polymorphs and Topological Isomers

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 series of MOFs based on a triangular tri(4-pyridylphenyl)amine ligand combined with carboxylate or nitrate auxiliary ligands

A series of new metal–organic frameworks based on a triangular tri(4-pyridylphenyl)amine (TPPA) ligand that possess novel structures and features have been successfully synthesized and structurally characterized in detail.

pH-controlled polymorphism in a layered dysprosium phosphonate and its impact on the magnetization relaxation

This communication reports two polymorphic dysprosium compounds that exhibit slow relaxation of magnetization with significantly different energy barriers.

Two dimensional cyano-bridged hetero-metallic coordination polymers containing metal⋅⋅⋅π interactions

Three cyano bridged hetero-metallic complexes of general formula, [Cu(NH3)2(μ-ampy)M(μ-CN)2(CN)2]n [ampy=4-aminomethylpyridine, M=Ni(II) (1), Pd(II) (2) and Pt(II) (3)] have been synthesized and characterized by vibrational (FT-IR and Raman) spectroscopy, single crystal X-ray diffraction, thermal analyses and elemental analyses. The complexes crystallize in triclinic system with space group P-1. In all complexes, M(II) ions are coordinated by four cyano ligands, and four N atoms in the equatorial plane around the Cu atom form a slightly distorted square-planar arrangement, while the slightly distorted octahedral coordination is completed by the cyanide N atoms in the axial positions. In one-dimensional structures of all the complexes, [Cu(ampy)](2+) cations and [M(CN)4](2-) anions are linked via bridging cyano ligands. The adjacent one-dimensional structures form a 2D network to connect by the μ-ampy bridging ligands. The 2D layers are further linked by metal⋯π and hydrogen bonding interactions to generate a three dimensional network.

pH-Induced formation of metalloligand: increasing structure dimensionality by tuning number of ligand functional sites

Two complexes, 2D [Cu(2)(CN)(2)(4-Hpcih)](n) and 3D [[Cu(2)(CN)(1.5)(4-pcih)].1.25H(2)O](n) (4-Hpcih = 4-pyridinecarbaldehyde isonicotinoyl hydrazone), were obtained using a synthetic approach of pH-induced formation of metalloligands, successfully demonstrating a strategy to increase structure dimensionality by tuning the number of ligand functional sites.

Two Polyknotted Topological Isomers of Copper(I) 3,5-Bis(4-pyridyl)pyrazolates

Two unprecedented 3D polyknotted isomers, arisen from different linkage modes of SCN-, were obtained from 3,5-bis(4-pyridyl)-1H-pyrazole (Hbppz) and CuSCN under different conditions.