Luminescence properties of complexes Ln(Phen)(C6F5COO)3 (Ln = Tb, Eu) and Ln(C6F5COO)3 · nH2O (Ln = Tb, n = 2; Ln = Eu, n = 1). Structures of the [Tb2(H2O)8(C6F5COO)6] complex and its isomer in the supramolecular compound [Tb2(H2O)8(C6F5COO)6] · 2C6F5COOH

Highly Luminescent, Water‐Soluble Lanthanide Fluorobenzoates: Syntheses, Structures and Photophysics, Part I: Lanthanide Pentafluorobenzoates

“…The preference for as pecific coordination mode should be affected by lanthanide contraction, because shortening of the LnÀOb ond increases stericr epulsion between the ligands, which leads to ad ecrease in the probability of k 2 coordination. The changes in preference for k 2 coordination follows this trend:l igandsw ith k 2 coordination in the a-Ln and b-Ln phases are both observed for Nd to Gd, whereas exclusively k 1 ligand coordination in the g-Ln phasei ss pecific forD yt oT m. For terbium, which is between these two ranges, both a-Tb and g-Tb structural types are possible; a-Tb is knowni nt he literature [19] and a-Tb and g-Tb were obtained in our work.…”

“…[17] Therefore, the same synthetic route is commonlyu tilized for the synthesis of thesec omplexes, namely the reaction between Ln(OH) 3 and Hpfb in an aqueous/organic medium, followed by solvent evaporation or saltingo ut. [19] It is not surprising that in this synthetic route the hydratec ompositiono fl anthanide pentafluorobenzoates depends strongly on the solvent and the separation method. We used the same method for our syntheses, but with aunified isolation procedure of microcrystalline powder samples for all studied lanthanide complexes (Scheme 1).…”

“…Therefore, in our work we focus on an investigation of the syntheses, structures, and photophysical properties of lanthanide fluorobenzoates with different degrees of fluorination. Herein, we selected pentafluorobenzoates[ Ln(pfb) 3 (H 2 O) x ], in which the ligand has the maximum degree of fluorination, as the starting point of our study.T hey are noted to emit in both the visible and IR ranges, [17][18][19][20][21][22][23] but the published data are incomplete and contradictory.B y using this example, we developed am ethodological approach for the investigation of these compounds and revealed the main patternso ft heir structural and luminescentbehavior.…”

“…For the first time, we present aconcise overview of the chemical properties of lanthanide pentafluorobenzoates by using all lanthanides from praseodymium to lutetium (excludingr adioactive promethium). Ap articular emphasis was placedo n alterations in the crystal struc-ture (five phases were found), which arise in complexes along the lanthanide row.A sa dditional andc omplementary tools, 19 FNMR and EXAFS spectroscopies were employed to obtain information about the local structure of complexes in solution. The photophysical properties of complexes that emit in the visible (Ln = Tb, Eu) and NIR regions (Ln = Nd, Er,Y b) werea lso thoroughly studied.…”

A new europium fluorous metal–organic framework with pentafluorobenzoate and 1,10-phenanthroline ligands: Synthesis, structure and luminescent properties

“…So far, the lanthanide MOFs constructed from carboxylate ligands have been well studied [15][16][17]; however, there are few reports of lanthanide MOFs containing perfluorinated carboxylate ligands [18,19]. Herein, a novel FMOF of Eu 2 (OOCC 6 F 5 ) 6 (C 12 H 8 N 2 ) 2 (H 2 O) 2 (1) has been successfully synthesized under one-pot condition using EuCl 3 Á6H 2 O, perfluorinated carboxylate as well as flexible N-donor ligand.…”