Synthesis, Crystal Structure, and Luminescence Properties of the Iso-Reticular Series of Lanthanide Coordination Polymers Synthesized from Hexa-Lanthanide Molecular Precursors

Haiyun Yao (1) , Guillaume Calvez (1) , Carole Daiguebonne (1) , Yan Suffren (1) , Kevin Bernot (1) , Thierry Roisnel (1) , Olivier Guillou (1)

1 ISCR - Institut des Sciences Chimiques de Rennes

Microwave-assisted reactions in DMSO, between a hexa-lanthanide octahedral complex ([Ln(6)(μ(6)-O)(μ(3)-OH)(8)(NO(3))(6)(H(2)O)(12)·2NO(3)·2H(2)O] with Ln = Nd-Yb plus Y) and either 3-halogenobenzoic acid (hereafter symbolized by 3-xbH with x = f or c for fluoro or chloro, respectively) or 4-halogenobenzoic acid (hereafter symbolized by 4-xbH with x = f, c, or b for fluoro, chloro, or bromo, respectively), lead to 1D lanthanide coordination polymers. These coordination polymers are almost iso-reticular. The crystal structure is described on the basis of the coordination polymer with chemical formula [Tb(4-fb)(3)(DMSO)(H(2)O)(2)·DMSO](∞) obtained from 4-fluorobenzoic acid (4-fbH) and the Tb(3+)-based octahedral complex: It crystallizes in the triclinic system, space group P1̅ (n°2), with the following cell parameters: a = 9.8561(9) Å, b = 10.5636(9) Å, c = 15.1288(15) Å, α = 100.840(3)°, β = 95.552(3)°, γ = 110.482(3)°, V = 1426.4(3) Å(3), and Z = 2. It can be described on the basis of 1D molecular chains. Luminescence properties of the Tb and Eu derivatives have been measured and compared vs the halogeno-function and its position (meta or para). Some molecular alloys have also been prepared to estimate the strength of the intermetallic energy transfers. To confirm that the hexa-nuclear complexes (and not the halogenated ligand) have a structuring effect for the formation of the straight chain-like molecular motif, another coordination polymer with chemical formula [Tb(4-npa)(3)DMSO·DMSO·H(2)O](∞) where 4-npaH symbolizes 4-nitro-phenyl-acetic acid has been prepared. It crystallizes in the triclinic system, space group P1̅ (n°2) with the following cell parameters: a = 7.8784(8) Å, b = 14.8719(16) Å, c = 15.2753(17) Å, α = 73.612(4)°, β = 86.406(4)°, γ = 83.104(4)°, V = 1703.8(3) Å(3), and Z = 2. Its crystal structure can be described on the basis of a molecular motif that is similar to the one observed in the five previous crystal structures which confirms the structuring effect of the hexa-nuclear complexes.

Mots clés: Coordination polymers; Ligands; Crystal structure; Ions; Lanthanides

Domaines: Chimie

Haiyun Yao, Guillaume Calvez, Carole Daiguebonne, Yan Suffren, Kevin Bernot, et al.. Synthesis, Crystal Structure, and Luminescence Properties of the Iso-Reticular Series of Lanthanide Coordination Polymers Synthesized from Hexa-Lanthanide Molecular Precursors. Inorganic Chemistry, 2022, 61 (12), pp.4895-4908. ⟨10.1021/acs.inorgchem.1c03654⟩. ⟨hal-03632067⟩