title: Triggered ligand release coupled to framework rearrangement: generating crystalline porous coordination materials.
abstract: A robust 3-D porous structure of formula [Ln2(PDC)3(DMF)2](infinity) has been constructed from lanthanide cations (Ln = Er3+ or Y3+) and the non-linear anionic bridging ligand, pyridine-3,5-dicarboxylate (PDC2-) in dimethylformamide (DMF). The solvated framework polymers {[M2(PDC)3(DMF)2].n(solv)}(infinity) (M = Er, Y) undergo a solid-state, crystal-to-crystal reaction upon heating and are converted via loss of both sorbed and coordinated solvent and rearrangement of the framework core to give a desolvated and porous form with retention of structural integrity. This structural transfer is the first crystallographically characterized system with lanthanide metal ions. These porous products are shown to be effective absorbants for H2, N2, and benzene.
authors.affiliation: School of Chemistry and School of Mechanical, Materials & Manufacturing Engineering, University of Nottingham, University Park, Nottingham NG7 2RD, UK.
authors.forename: Junhua
authors.initials: J
authors.lastname: Jia
authors.forename: Xiang
authors.initials: X
authors.lastname: Lin
authors.forename: Alexander J
authors.initials: AJ
authors.lastname: Blake
authors.forename: Neil R
authors.initials: NR
authors.lastname: Champness
authors.forename: Peter
authors.initials: P
authors.lastname: Hubberstey
authors.forename: Limin
authors.initials: L
authors.lastname: Shao
authors.forename: Gavin
authors.initials: G
authors.lastname: Walker
authors.forename: Claire
authors.initials: C
authors.lastname: Wilson
authors.forename: Martin
authors.initials: M
authors.lastname: Schröder