2D water layer enclathrated between Mn(II)–Ni(CN)4 coordination frameworks

Hofmann-Type Cyanide Bridged Coordination Polymers for Advanced Functional Nanomaterials

Since the discovery of Hofmann clathrates of inorganic cyanide bridged coordination polymers (Hofmann-type CN-CPs), extensive research is done to understand their behavior during spin transitions caused by guest molecules or external stimuli. Lately, research on their nanoscale architectures for sensors and switching devices is of interest. Their potential is reported for producing advanced functional inorganic materials in two-dimensional (2D) morphology using a scalable solid-state thermal treatment method. For instance, but not restricted to, alloys, carbides, chalcogenides, oxides, etc. Simultaneously, their in situ crystallization at graphene oxide (GO) nanosheet surfaces, followed by a subsequent self-assembly to build layered lamellar structures, is reported providing hybrid materials with a variety of uses. Hence, an overview of the most recent developments is presented here in the synthesis of nanoscale structures, including thin films and powders, using Hofmann-type CN-CPs. Also thoroughly demonstrated are the most recent synthetic ideas with the modest control over the size and shape of nanoscale particles. Additionally, in order to create new functional hybrid materials for electrical and energy applications, their thermal decomposition in various environments and hybridization with GO and other guest molecules is examined. This review article also conveyed their spin transition, astounding innovative versatile adhesives, and structure features.

Highly emissive polymorphs of anhydrous cadmium tetracyanoplatinate and their solvated coordination networks

Two anhydrous polymorphs of cadmium cyanoplatinate Cd[Pt(CN)₄] coordination polymers have been synthesized and thermally, spectroscopically, and structurally characterized. α-Cd[Pt(CN)₄] and β-Cd[Pt(CN)₄] are densely packed, highly emissive 3-D solids, with quantum yields of 0.85 (λ_em = 520 nm) and 0.79 (λ_em = 448 nm) respectively. Their mutual hydrate, Cd(H₂O)[Pt(CN)₄]·2H₂O, forms a complex 3-D coordination polymer with Cd-O-Cd bridges and Pt-Pt interactions. Additionally, exposure of solid α-Cd[Pt(CN)₄] and β-Cd[Pt(CN)₄] to several solvent vapours results in the formation of 2-D cyanometallate sheets of the adduct compounds CdL₂[Pt(CN)₄] (L = DMSO, DMF, and pyridine). Cd(pyridine)₂[Pt(CN)₄] shows a significantly lower quantum yield (0.32) in comparison to the parent Cd[Pt(CN)₄] coordination polymers. Upon heating CdL₂[Pt(CN)₄] preferentially forms the kinetic product α-Cd[Pt(CN)₄].

Relevant electronic interactions related to the coordination chemistry of tetracyanometallates. An XPS study

In the K₂[M(CN)₄]·xH₂O (M = Ni, Pd, Pt) series, the CN ligand is found to donate electron density to the K ion, which is detected as a decrease in the K 2p BE. The charge donated is proportional to that removed from the inner metal (M) via π-back bonding.

Two-dimensional cyano-bridged coordination polymer of Mn(H2O)2[Ni(CN)4]: structural analysis and proton conductivity measurements upon dehydration and rehydration

The interlayer spaces in the two-dimensional cyano-bridged coordination polymer were found to be non-ionic and not proton conductive.