title: A family of porous lonsdaleite-e networks obtained through pillaring of decorated kagomé lattice sheets.
abstract: A new and versatile class of metal-organic materials (MOMs) with augmented lonsdaleite-e (lon-e-a) topology is presented herein. This family of lon-e nets are built by pillaring of hexagonal two-dimensional kagomé (kag) lattices constructed from well-known [Zn2(CO2R)4] paddlewheel molecular building blocks (MBBs) connected by 1,3-benzenedicarboxylate (bdc(2-)) linkers. The pillars are [Cr3(μ3-O)(RCO2)]6 trigonal prismatic primary MBBs decorated by six pyridyl moieties (tp-PMBB-1). The three-fold symmetry (D3h) of tp-PMBB-1 is complementary with the alternating orientation of the axial sites of the paddlewheel MBBs and enables triple cross-linking of the kag layers by each pillar. These MOMs represent the first examples of axial-to-axial pillared undulating kag layers, and they are readily fine-tuned because the bdc(2-) moieties can be varied at their 5-position without changing the overall structure. This lon-e platform possesses functionalized hexagonal channels since the kag lattices are necessarily eclipsed. The effects of the substituent at the 5-positions of the bdc(2-) linkers upon gas adsorption, particularly the heats of adsorption of carbon dioxide and methane, were studied.
authors.affiliation: Department of Chemistry, University of South Florida , 4202 East Fowler Avenue, CHE205, Tampa, Florida 33620, United States.
authors.forename: Alexander
authors.initials: A
authors.lastname: Schoedel
authors.forename: Wesley
authors.initials: W
authors.lastname: Boyette
authors.forename: Lukasz
authors.initials: L
authors.lastname: Wojtas
authors.forename: Mohamed
authors.initials: M
authors.lastname: Eddaoudi
authors.forename: Michael J
authors.initials: MJ
authors.lastname: Zaworotko