Abstract
Solid-state functional luminescent materials arouse an enormous scientific interest due to their diverse applications in lighting, display devices, photonics, optical communication, low energy scintillation, optical storage, light conversion, or photovoltaics. Among all types of solid luminophors, the emissive coordination polymers, especially those based on luminescent trivalent lanthanide ions, exhibit a particularly large scope of light-emitting functionalities, fruitfully investigated in the aspects of chemical sensing, display devices, and bioimaging. Here, we present the complete overview of one of the promising families of photoluminescent coordination compounds, that are heterometallic d–f cyanido-bridged networks composed of lanthanide(3+) ions connected through cyanide bridges with polycyanidometallates of d-block metal ions. We are showing that the combination of cationic lanthanide complexes of selected inorganic and organic ligands with anionic homoligand [M(CN)x]n− (x = 2, 4, 6 and 8) or heteroligand [M(L)(CN)4]2− (L = bidentate organic ligand, M = transition metal ions) anions is the efficient route towards the emissive coordination networks revealing important optical properties, including 4f-metal-centred visible and near-infrared emission sensitized through metal-to-metal and/or ligand-to-metal energy transfer processes, and multi-coloured photoluminescence switchable by external stimuli such as excitation wavelength, temperature, or pressure.
Highlights
Luminescent materials, that are able to emit the light due to absorption of photons, electric current, chemical reactions, or a mechanical action, are applied in the numerous aspects of science, technology, and everyday life
Similar effects of 4f-centred emission realized by a simple direct f-f excitation or organic ligand-to-Ln3+ energy transfer were detected for a series of the ionic salts of lanthanide(3+) ions with dimethylsulfoxide, 1,10-phenanthroline and 2,2’-bipyridine accompanied by non-coordinated tetracyanidometallates, and for the trinuclear {LnIII 2 PtII } molecules with the supporting phen ligand [84,85]
We have presented a detailed overview of lanthanide photoluminescence in coordination networks based on polycyanidometallates
Summary
Luminescent materials, that are able to emit the light due to absorption of photons, electric current, chemical reactions, or a mechanical action, are applied in the numerous aspects of science, technology, and everyday life. Similar effects of 4f-centred emission realized by a simple direct f-f excitation or organic ligand-to-Ln3+ energy transfer were detected for a series of the ionic salts of lanthanide(3+) ions with dimethylsulfoxide, 1,10-phenanthroline (phen) and 2,2’-bipyridine accompanied by non-coordinated tetracyanidometallates, and for the trinuclear {LnIII 2 PtII } molecules with the supporting phen ligand [84,85]. Produced the cyanido-bridged [DyIII (3-OHpy) (H2 O)4 ][CoIII (CN)6 ]·H2 O zig-zag chains (Figure 5a), exhibiting the room temperature white-light DyIII emission realized by the complex excitation involving direct f-f transitions, and Co3+ -to-Dy3+ and 3-OHpy-to-Dy3+ energy transfer pathways (Figure 5b) [96] This topology was reported for trimetallic [EuIII x TbIII 1-x (3-OHpy) (H2 O)4 ][CoIII (CN)6 ]·H2 O materials showing the multi-coloured 4f-centred emission. Crystal structure andoptical optical properties properties ofofnear-infrared (NIR)-emitting cyanido-bridged
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