Synthesis, structure, photophysical and catalytic properties of CuI–Iodide complexes of di-imine ligands

Cu(I)/N,N-Imine Ligand Catalyzed C(sp3)-C(sp) Coupling of Alkyl Bromides with Alkynes: Scope and Mechanistic Investigation

We have developed an efficient Cu/N,N-bidentate imine ligand catalytic system for C(sp³)-C(sp) coupling to obtain internal alkynes, di/trisubstituted allenes and strained bridged cyclic lactams in moderate to excellent yields from readily available alkyl(benzyl) bromides in one-pot transformation. Density Functional Theory (DFT) assisted mechanistic study along with control experiments support the involvement of bialkynylated copper species which undergo single electron transfer (SET) with alkyl halides to generate radical intermediate in the reaction. The N,N-bidentate imine ligand plays a vital role in stabilization of intermediate copper complex and facilitates the product formation.

Photoactive Copper Complexes: Properties and Applications

Photocatalyzed and photosensitized chemical processes have seen growing interest recently and have become among the most active areas of chemical research, notably due to their applications in fields such as medicine, chemical synthesis, material science or environmental chemistry. Among all homogeneous catalytic systems reported to date, photoactive copper(I) complexes have been shown to be especially attractive, not only as alternative to noble metal complexes, and have been extensively studied and utilized recently. They are at the core of this review article which is divided into two main sections. The first one focuses on an exhaustive and comprehensive overview of the structural, photophysical and electrochemical properties of mononuclear copper(I) complexes, typical examples highlighting the most critical structural parameters and their impact on the properties being presented to enlighten future design of photoactive copper(I) complexes. The second section is devoted to their main areas of application (photoredox catalysis of organic reactions and polymerization, hydrogen production, photoreduction of carbon dioxide and dye-sensitized solar cells), illustrating their progression from early systems to the current state-of-the-art and showcasing how some limitations of photoactive copper(I) complexes can be overcome with their high versatility.

Crystal structure of (E)-N-(4-chlorophenyl)-1-(pyridin-2-yl)methanimine, C12H9ClN2

C12H9ClN2, monoclinic, P21/c (no. 14), a = 19.0184(3) Å, b = 4.81220(10) Å, c = 11.3896(2) Å, β = 107.388(1)°, Z = 4, V = 994.75(3) Å3, R gt(F) = 0.0284, wR ref(F 2) = 0.0800, T = 100(2) K.

Two cationic [(CuxIy)x−y]n motif based coordination polymers and their photocatalytic properties

Two cationic [(Cu_xI_y)^x−y]_n based coordination polymers, featuring a 3,6-connected net or a coordination chain, and interesting supramolecular structures, exhibit photochemistry properties towards degradation of methyl blue.