Isophthalato-Based 2D Coordination Polymers of Eu(III), Gd(III), and Tb(III): Enhancement of the Terbium-Centered Luminescence through Thiophene Derivatization
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de Bettencourt-Dias, Ana
Issue Date
2005
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We present here the first examples of lanthanide ion complexes with only isophthalic acid or thiophenylisophthalic acid ligands. The complexes of isophthalic acid with Eu3+ (1) and Tb3+ (2) and the moderately soluble complexes of 5-thiophen-3-ylisophthalate with Eu3+ (3), Gd3+ (4), and Tb3+ (5) were isolated as single crystals through gel crystallization. X-ray diffraction studies confirm the cross-linking structure of these complexes, which, in case of the thiophenyl derivatives, results in low solubility in common solvents. The two-dimensional isophthalato complex of Eu3+ (1) crystallizes in the C2/c space group, with a = 22.154(4), b = 12.649(3), and c = 15.921(3) Å, β = 112.34(3)°, and V = 4126.7(14) Å3, while the one-dimensional Tb3+ complex of the same ligand, 2, crystallizes in the space group P21/c with a = 11.921(2), b = 10.838(2), and c = 17.499(4) Å, β = 92.44(3)°, and V = 2258.9(8) Å3. The thiophenylisophthalato complexes of Eu3+ (3) and Gd3+ (4) are two-dimensional and crystallize in the P2/n space group with parameters for 3 of a = 14.139(3), b = 10.684(2), and c = 15.138(3) Å, β = 102.51(3)°, and V = 2232.3(8) Å3 and parameters for 4 of a = 14.1195(13), b = 10.6594(10), and c = 15.1149(14) Å, β = 102.529(2)°, and V = 2220.7(4) Å3, while the Tb3+ complex, 5, also two-dimensional, crystallizes in the P1̄ space group with a = 11.051(2), b = 14.528(3), and c = 15.041(3) Å, α = 77.63(3), β = 87.86(3), and γ = 83.51(3)°, and V = 2343.48 Å3. All complexes of Eu3+ and Tb3+ luminesce in aqueous solution, and the luminescence lifetimes and quantum yields are 123.8 ± 7.4, 0.14% (1), 475.1 ± 14.5, 3.58% (3), 129.3 ± 3.5, 0.19% (4), and 213.9 ± 2.2 μs, 7.46% (5).
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