From AgCN Chains to a Fivefold Helix and a Fishnet‐Shaped Framework Structure

An Insight into nd10 Metal Cyanide-based Coordination Polymers Through ab-initio Calculations: Electronic Properties and Optical Response

Semiconductors are essential for modern life since they are the basis of many current technologies that are related to better living standards. Some of them, characterized by the periodic assembling of metal cyanides with filled d-shell (nd¹⁰ ) constitute an interesting series of cyanide-based coordination polymers with physical properties such like anomalous anisotropic thermal expansion and quantum confinement effects related to the polymer's width that can be exploited for technological applications. Herein, the electronic structure of nd¹⁰ metal cyanide-based systems were studied both experimentally and through Density Functional Theory. The band gap found for one-dimensional (1D) -M-C≡N- (M=Cu, Ag, Au) and tetrahedral M-(C≡N)₂ (M=Zn, Cd, Hg) systems can be attributed to Laporte-allowed π → ${\to }$ π* (Metal to Ligand Charge Transfer mechanism) combined with metal center (d → ${\to }$ s,p) electronic transitions. Aurophilic bonding was found on the AuCN structure, and a new forbidden electronic transition associated to its band gap is reported. Computed effective and reduced masses from carriers revealed that carrier mobility and quantum confinement effects are greater in 1D systems.

An unprecedented 2D copper(i)–cyanide complex with 20-membered metal rings: the effect of the co-ligand 4,5-diazafluoren-9-one

The effects of L ligands were illustrated in constructing a copper(i)–cyanide complex with 20 membered metal rings, in which the L ligands act as corner and bridge ligands simultaneously forming a 2D layer with a Cu₂₀(CN)₁₈L₂ macrocycle.

Radical-involved photosynthesis of AuCN oligomers from Au nanoparticles and acetonitrile

We show here the first radical route for the direct photosynthesis of AuCN oligomers with different sizes and shapes, as evidenced by TEM observations, from an Au nanoparticle/benzaldehyde/CH(3)CN ternary system in air under UV-light irradiation. This photochemical route is green, mild, and universal, which makes itself distinguishable from the common cyanidation process. Several elementary reaction steps, including the strong C-C bond dissociation of CH(3)CN and subsequent •CN radical addition to Au, have been suggested to be critical in the formation of AuCN oligomers based on the identification of •CN radical by in situ EPR and the radical trapping technique, and other reaction products by GC-MS and (1)H NMR, and DFT calculations. The resulting solid-state AuCN oligomers exhibit unique spectroscopic characters that may be a result of the shorter Au-Au distances (namely, aurophilicity) and/or special polymer-like structures as compared with gold cyanide derivatives in the aqueous phase. The nanosized AuCN oligomers supported on mesoporous silica showed relatively good catalytic activity on the homogeneous annulation of salicylaldehyde with phenylacetylene to afford isoflavanones employing PBu(3) as the cocatalyst under moderate conditions, which also serves as evidence for the successful production of AuCN oligomers.

Coexistence of chiral hydrophilic and achiral hydrophobic channels in one multi-helical-array metal-organic framework incorporating helical water cluster chains

A novel host-guest metal-organic compound with both chiral hydrophilic and achiral hydrophobic channels has been obtained through the reaction of Cd(II) ion and a versatile asymmetrical ligand of H(4)bptc (H(4)bptc = 1,1'-biphenyl-2,2',3,3'-tetracarboxylic acid) based on hydro(solvo)thermal reactions.

Interweaving of Triple-Helical and Extended Metal−O−Metal Single-Helical Chains with the Same Helix Axis in a 3D Metal−Organic Framework

A novel 3D metal-organic framework [Cd2(m-bptc)(4,4'-bpy)(0.5)(H2O)4].H2O (1; m-H4bptc = 1,1'-biphenyl-2,3',3,4'-tetracarboxylic acid, 4,4'-bpy = 4,4'-bipyridine) with interweaving of triple- and single-helical chains has been obtained based on hydro(solvo)thermal reactions.

Two novel halogeno(cyano)argentates with efficient luminescence

The reactions of silver(I) cyanide with tetraalkylammonium salts in anhydrous tetrahydrofuran (THF) under solvothermal conditions and then diffused with ether lead to two novel mixed halogeno(cyano)argentates(I) with efficient luminescence.