Syntheses and characterizations of two lanthanide(III)–copper(II) coordination polymers constructed by pyridine-2,6-dicarboxylic acid

• Published in: Inorganica Chimica Acta 2005-03, Vol.358 (4), p.1298-1304
• Main Authors: Cai, Yue-Peng, Su, Cheng-Yong, Li, Guo-Bi, Mao, Zong-Wan, Zhang, Chi, Xu, An-Wu, Kang, Bei-Sheng
• Format: Article
• Language: English
• Subjects: Crystal structures; Lanthanide(III)–copper(II) coordination polymers; Pyridine-2,6-dicarboxylic acid; Temperature-dependent magnetic susceptibilities; The thermal stabilities
• ISSN: 0020-1693; 1873-3255
• DOI: 10.1016/j.ica.2004.11.041

Reaction of La 2O 3 and Pr 2O 3 with pyridine-2,6-dicarboxylic acid (H 2pydc), CuO and H 2O with a mole ratio of 1:2:4:300 resulted in the formation of two polymeric Cu(II)–Ln(III) complexes 1 and 2 with one-dimensional infinite “∞” shape chains, which are assembled into two-dimensional layer and an open three-dimensional network with nanoscale porosities by various weak intermolecular forces involving O–H⋯O hydrogen bonds and π⋯π stacking interactions. Temperature-dependent magnetic susceptibilities and the thermal stabilities of complexes 1 and 2 were examined. The hydrothermal reaction of La 2O 3 and Pr 2O 3 with pyridine-2,6-dicarboxylic acid (H 2pydc), CuO, and H 2O with a mole ratio of 1:2:4:300 resulted in the formation of two polymeric Cu(II)–Ln(III) complexes, [{Ln 4Cu 2(pydc) 8(H 2O) 8} · 18H 2O] n (Ln = La ( 1); Pr ( 2)). 1 and 2 are isomorphous and crystallize in monoclinic space group C2/c. Complexes 1 and 2 have one-dimensional infinite chains with “∞” shape. The 1D chains are linked by the hydrogen bonds and π⋯π stacking interactions to form layer structures which are further linked by the hydrogen bonds and π⋯π stacking interactions to form the three-dimensional (3D) structures with nanoscale porosities. Temperature-dependent magnetic susceptibilities and the thermal stabilities of complexes 1 and 2 were studied.