A series of new microporous lanthanide frameworks [Ln(C8H 3NO6)(L)0.5(H2O)]·3H 2O (Ln = Pr, Nd, Sm and Gd, and L = C8H4O 4 or C8H4O4/C8H 3NO6): Syntheses, characterization and photoluminescence properties

• Main Authors: Panyarat K., Prior T.J., Rujiwatra A.
• Format: Article
• Language: English
• Published: Elsevier Ltd 2014
• Online Access: http://www.scopus.com/inward/record.url?eid=2-s2.0-84902831207&partnerID=40&md5=dfd0b5ba95f8f66f9d7723f729e2dcf0; http://cmuir.cmu.ac.th/handle/6653943832/4854
• Institution: Chiang Mai University

Four new microporous lanthanide coordination polymers of general formula [Ln(C8H3NO6)(L)0.5(H 2O)]·3H2O (Ln = Pr, Nd, Sm and Gd, and L = C 8H4O4 or C8H4O 4/C8H3NO6) were hydrothermally synthesized using in situ ligand synthesis. The complexes are isostructural featuring the NbO type framework, which is constructed from chains of edge-sharing {LnO9} polyhedra. The one-dimensional channel extending in the [1 0 0] direction with an aperture of approximately 4 × 8 Å2 houses water of crystallization, which are ordered in edge-shared pentagons by hydrogen bonding interactions. Evidence for the significance of the hydrogen bonding interactions in stabilizing the framework is presented. Crystallographic disorder in the organic ligands, including rare substitutional disorder, is described. The complexes show type I gas sorption isotherms characteristic of microporosity, and are thermally stable up to approximately 400 °C. The solid state luminescence properties of these complexes are included. © 2014 Elsevier Ltd. All rights reserved.