A family of 3D lanthanide–organic frameworks constructed from parallelogram secondary building units: synthesis, structures and properties

• Published in: CrystEngComm Vol. 16; no. 9; pp. 1777 - 1785
• Main Authors: Sun, Ya-guang, Li, Jian, Li, Ke-long, Xu, Zhen-he, Ding, Fu, Ren, Bao-yi, Wang, Shu-ju, You, Li-xin, Xiong, Gang, Smet, Philippe F.
• Format: Journal Article
• Language: English
• Published: 01.01.2014
• Subjects: Diffraction; Ferromagnetism; Luminescence; Oxalic acid; Single crystals; Three dimensional; Topology; X-rays
• ISSN: 1466-8033; 1466-8033
• DOI: 10.1039/c3ce42197j

A family of lanthanide-organic frameworks, {Ln sub(2)(pyip)(ox) sub(2.5)(H sub(2)O) sub(5)} sub() n(Ln = La (1), Pr (2), Sm (3), Eu (4), Gd (5), Tb (6), Dy (7)) has been synthesized based on mixed bridging ligands, H sub(2)pyip and oxalate anion (H sub(2)pyip = 5-(4-pyridyl)-isophthalic acid, H sub(2)ox = oxalic acid) and characterized by elemental analysis, Fourier transform infrared spectroscopy, steady state and time-resolved luminescence spectroscopy, thermogravimetric analysis, powder X-ray diffraction and single-crystal X-ray diffraction. The single-crystal X-ray diffraction analysis results show that complexes 1-7 are isostructural. They crystallize in the same P2 sub(1)/cspace group and exhibit a (3,4)-connected {4 super(2).6.8 super(2).10}{8 super(2).10} topology, being a 2-nodal net topology. The luminescence properties of 3, 4, 6, and 7 were investigated and related to the structural properties. The magnetic studies reveal that strong ferromagnetic coupling exists in compound 6.