A ytterbium polymer incorporating ethyl-4,5-imidazole-dicarboxylate and formate coligand: Structure, luminescent, and magnetic properties

作者：Feng X^*; Zhao Y; Lei P P; Shang J J; Wang L Y

来源：Russian Journal of Coordination Chemistry, 2013, 39(5): 405-410.

DOI：10.1134/S1070328413050023

A new lanthanide-organic coordination polymer incorporating both substituted imdazole dicarboxylate and formate auxiliary ligand, namely {[Yb-3(HEimda)(4)(mu(2)-HCOO) center dot 4H(2)O] center dot 2H(2)O} (n) (I) (H(3)Eimda = 1H-2-ethyl-4,5-imidazole-dicarboxylic acid), has been prepared and was structurally characterized by elemental analysis, IR and X-ray diffraction. It crystallizes in the monoclinic system, space group of C2/c. The polymer I is built from two dimensional (2D) double decker networks based on the Ln(4)HEimda(4) tetranuclear basic carboxylate as secondary building unit. The extensive hydrogen bonds extend the 2D lamellar network into a 3D supramolecular aggregate. The emission spectrum of polymer I exhibits ligand-to-metal charge-transfer luminescence. Variable-temperature magnetic susceptibility measurement reveals that the end to end bridging fashion of formate group results in the depopulation of the stark levels for a single Yb3+ ion and/or possible antiferromagntic interactions between Yb3+ ions within the carboxylato bridged dinuclear unit.

• 出版日期2013-5
• 单位南阳师范学院; 洛阳师范学院