Solvothermal synthesis, crystal structure and characterizations of three quaternary lanthanide homophthalate coordination polymers

Three new quaternary lanthanide coordination polymers, [Ln2(hpht)2(phen)2(NO3)2]n (Ln = Y (1), Tb (2) and Er (3)) (H2hpht = homophthalic acid, phen = 1,10-phenanthroline), have been solvothermally synthesized and structurally characterized. X-ray structure analyses show that these three compounds are isostructural and crystal data are as follows: compound 1, triclinic, space group P-1 (No. 2), a = 8.1403(10) Å, b = 9.8137(12) Å, c = 13.0662(16) Å, β = 79.320(2)°, V = 1005.8(2) Å3, Z = 1, R1 = 0.0359, wR2 = 0.0812; compound 2, triclinic, space group P-1 (No. 2), a = 8.204(2) Å, b = 9.790(3) Å, c = 13.121(3) Å, β = 79.019(3)°, V = 1014.6(5) Å3, Z = 1, R1 = 0.0489, wR2 = 0.1276; compound 3, triclinic, space group P-1 (No. 2), a = 8.1145(7) Å, b = 9.8083(8) Å, c = 13.0253(11) Å, β = 79.4260(10)°, V = 999.28(15) Å3, Z = 1, R1 = 0.0241, wR2 = 0.0526. The H2hpht ligands bridge lanthanide ions via bridging–bridging mode into novel one-dimensional paddlewheel structures, which are further extended to three-dimensional supramolecular structure by the π–π interaction of phen. The thermal behavior and photoluminescent properties of compound 2 have also been investigated.

Three quaternary lanthanide coordination polymers, [Ln2(hpht)2(phen)2(NO3)2]n (Ln = Y, Tb, Er) that feature homophthalate (hphth2−) and 1,10-phenanthroline (phen) ligands, have been solvothermally synthesized and characterized. X-ray structure analyses show that the three compounds are isostructural and that the homophthalate ligands bridge lanthanide ions into a novel one-dimensional paddlewheel nanotube with an opening of about 4.023 Å × 5.403 Å, which are further extended to three-dimensional porous supramolecular structure by the π–π interaction of phen.Figure optionsDownload as PowerPoint slide