Abstract
Coordination polymers are constructed from metal ions and bridging ligands, linking them into solid-state structures extending in one (1D), two (2D) or three dimensions (3D). Two- and three-dimensional coordination polymers with potential voids are often referred to as metal-organic frameworks (MOFs) or porous coordination polymers. Luminescence is an important property of coordination polymers, often playing a key role in their applications. Photophysical properties of the coordination polymers can be associated with intraligand, metal-centered, guest-centered, metal-to-ligand and ligand-to-metal electron transitions. In recent years, a rapid growth of publications devoted to luminescent or fluorescent coordination polymers can be observed. In this review the use of fluorescent ligands, namely, 4,4′-stilbenedicarboxylic acid, 1,3,4-oxadiazole, thiazole, 2,1,3-benzothiadiazole, terpyridine and carbazole derivatives, naphthalene diimides, 4,4′,4′′-nitrilotribenzoic acid, ruthenium(II) and iridium(III) complexes, boron-dipyrromethene (BODIPY) derivatives, porphyrins, for the construction of coordination polymers are surveyed. Applications of such coordination polymers based on their photophysical properties will be discussed. The review covers the literature published before April 2020.
Highlights
Coordination polymers are solid-state structures consisting of repeating coordination units extending in one, two or three dimensions [1]
Coordination polymers in which metal ions are linked by organic ligands into structures with potential voids are often referred to as metal-organic frameworks (MOFs) or porous coordination polymers [5,6,7,8,9]
A wide variety of highly emissive ligands is available to researchers, enabling them to tune the dimensionality and topology of the coordination polymers, as well as their functional properties, including sensing ability, thermochromism and photochromism, electroluminescence
Summary
Coordination polymers are solid-state structures consisting of repeating coordination units extending in one, two or three dimensions [1]. The authors of [88] studied the luminescent properties of two coordination polymers [Zn(sdc)(H2O)]n, [Cd(sdc)(H2O)]n, only data for the Zn structure is present It demonstrated strong emission bands at 435 and 459 nm in the solid state at room temperature upon excitation at. A pillar-layered coordination network {[Cd3(sdc)2(trz)2(H2O)2]·DMF}n (Htrz—1,2,4-triazole) prepared by Xiao et al exhibited strong emission band near 443 nm upon excitation at 320 nm, which was attributed to ligand-based fluorescence [94]. Photoluminescent properties of all compounds were explored, and it was found that MOFs with the pristine H2sdc exhibit broad ligand-based emission bands with a maximum near 447 nm. Guo et al synthesized luminescent MOF {[Zn2(mfda)2(4-bpo)(H2O)]·DMF}n (H2mdfa—9,9dimethylfluorene-2,7-dicarboxylate anion, 4-bpo—2,5-bis(4-pyridyl)-1,3,4-oxadiazole, Scheme 2), exhibiting parallel mutual polythreadings of 2D layers which are connected by hydrogen bonds into a self-penetrating framework with (44·610·7)(4·5·6)(46·52·616·71·9) topology [104]. Tbhpeo)a(budthco)]r·Cs Hat3tOriHbu}nt.e Tthhee aquutehnocrhsinagttreibffuectet ttohehqiguhe-necnheirnggy eCff-eHct atnodh/oigrhO-e-nHerogsyciCll-aHtorasnidn/oMr eOO-HH loasttciiclleamtoorsleicnuMlese.OH lattice molecules
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