Structure and Luminescence of Carboxylic Acid Samarium and Europium Complexes

【摘要】 Two crystals, [Sm（Hcpna）（cpna）·3 H₂O]n（1） and [Eu（Hcpna）（cpna）·2 H₂O]n（2）,have been synthesized by solvothermal method based on Sm3+ and Eu3+ with multiple acid ligands5-（4-carboxyphenoxy）nicotinic acid（H₂cpna）, and the new complexes have been characterized by single-crystal X-ray diffraction, elemental analysis, IR spectroscopy, thermogravimetric analysis and fluorescence analysis. Complex 1 exhibits a 1 D chain structure. It crystallizes in the triclinic system, space group P1 with a = 5.9738（11）, b = 12.528（2）, c = 18.021（4） ?, α = 93.156（3）o, β =98.067（3）o, γ = 92.692（3）o, V = 1331.3（4） ?3, Z = 2, S = 1.069, F（000） = 702, R = 0.0277 and wR =0.0688（I > 2σ（I））. Complex 2 shows a two-dimensional network structure, which crystallizes in monoclinic system, space group C2/c with a = 13.6733（19）, b = 18.422（3）, c = 10.4307（15） ?, β =93.881（2）o, V= 2621.4（7） ?3, Z = 4, S = 1.110, F（000） = 1372, R = 0.0302 and wR = 0.0811（I >2σ（I））. The solid-state fluorescent test results show tcomplex 1 has weaker fluorescence intensity than the ligand. However, complex 2 has excellent fluorescence properties, and can emit bright red light under the irradiation of ultraviolet lamp.更多还原

【Abstract】 Two crystals, [Sm（Hcpna）（cpna）·3 H₂O]n（1） and [Eu（Hcpna）（cpna）·2 H₂O]n（2）,have been synthesized by solvothermal method based on Sm3+ and Eu3+ with multiple acid ligands5-（4-carboxyphenoxy）nicotinic acid（H₂cpna）, and the new complexes have been characterized by single-crystal X-ray diffraction, elemental analysis, IR spectroscopy, thermogravimetric analysis and fluorescence analysis. Complex 1 exhibits a 1 D chain structure. It crystallizes in the triclinic system, space group P1 with a = 5.9738（11）, b = 12.528（2）, c = 18.021（4） ?, α = 93.156（3）o, β =98.067（3）o, γ = 92.692（3）o, V = 1331.3（4） ?3, Z = 2, S = 1.069, F（000） = 702, R = 0.0277 and wR =0.0688（I > 2σ（I））. Complex 2 shows a two-dimensional network structure, which crystallizes in monoclinic system, space group C2/c with a = 13.6733（19）, b = 18.422（3）, c = 10.4307（15） ?, β =93.881（2）o, V= 2621.4（7） ?3, Z = 4, S = 1.110, F（000） = 1372, R = 0.0302 and wR = 0.0811（I >2σ（I））. The solid-state fluorescent test results show tcomplex 1 has weaker fluorescence intensity than the ligand. However, complex 2 has excellent fluorescence properties, and can emit bright red light under the irradiation of ultraviolet lamp.更多还原