Structural characterization, photoluminescence and sensing properties of two copper(I)-iodide compounds

A 1D Cu(i)–I-pyrazine coordination polymer with controlled pressure-induced phase transition and opto-electronic response depending on mechanical stimuli, temperature, and CuI content

“…The excitation energy allows the electrons to jump from the full orbitals of CuI to the empty anti-bonding ones of the d → π* ligand, in a MLCT-type transition, typically located in the UV-visible range. Several studies with similar ligands 2,12,60 confirm that the emission is due to the mixed charge transfer of iodide and copper to the ligand [(I + Cu) LCT], due to the short distances between Cu–I and Cu–N. However, owing to the short Cu⋯Cu distances present at all temperatures, less than the sum of the van der Waals radii (2.8 Å), or at least half of those distances (2.797(2) Å (see Fig.…”

“…The study of multi-responsive materials to different external stimuli such as temperature and pressure is a very interesting topic both from the fundamental point of view and from its possible practical applications. 1–6 The experimental techniques developed in recent years have opened new perspectives for producing functional smart materials under extreme conditions. Indeed, there are some examples of Porous Coordination Polymers with interesting dynamic structures that have been studied as a function of pressure and temperature in the search for unusual elastic properties.…”

2D Cu(I)-I Coordination Polymer with Smart Optoelectronic Properties and Photocatalytic Activity as a Versatile Multifunctional Material

“…The excitation energy enables electrons to be promoted from the occupied CuI orbitals to the vacant antibonding ligand orbitals, resulting in a d → π* MLCT-type transition, located within the UV–visible range. Previous studies involving similar ligands 30 − 32 have provided evidence that the emission arises from a mixed charge transfer process involving iodide and copper to the ligand [(Cu + I) LCT] that is facilitated by the short distances between Cu–I and Cu–N. Nevertheless, even at room temperature, CP1 exhibits Cu···Cu distances that are shorter than the sum of the van der Waals radii (2.8 Å) or at least half of that distance (2.971(2) Å, refer to Table S2 ).…”

Novel Cu(I)-5-nitropyridine-2-thiol Cluster with NIR Emission: Structural and Photophysical Characterization

“…The challenging formation of Cu 6 S 6 clusters can be afforded by treating the Cu­(I) cation with ligands bearing −SH and −N moieties, such as those present in the mercaptonicotinic acid . In general, organosulfur ligands are frequently applied as bridging ligands for adjacent transition-metal sites in the design of luminescent materials. , The incorporation of a thiolate as a bridge in transition-metal complexes, in fact, is highly promising in terms of luminescence output since it allows a suitable match of orbital energies between the ligand and the metal, leading to a large electronic delocalization …”