Molecular tectonics: tubular crystals with controllable channel size and orientation

Abstract

The combination of flexible neutral organic tectons based on two pyridines interconnected by a thioether or thioester type spacer with an inorganic ZnSiF(6) pillar leads to the formation of 2-D coordination networks and the packing of the latter generates crystals offering controllable tubular channels with imposed orientation along the pillar axis.

Highly Productive C3H4/C3H6 Trace Separation by a Packing Polymorph of a Layered Hybrid Ultramicroporous Material

“…AA-α formed an AAAA layer arrangement similar to other sql topology HUMs (Figures 2, S5, and S6, some presented using simplified structures). 11,24,27,[41][42][43][44]51 S7). AB-α was found to exhibit ABAB stacking of layers, resulting in a pore structure distinct from that of AA-α and related materials.…”

Construction of Cd(ii)-based metal–organic frameworks incorporating SiF62− as fluorescence sensors for arginine

“…Subsequently, some similar MOFs incorporating SiF 6 2− anions by using pyrazine or pyridine-based ligands to react with MSiF 6 (M = Co, Ni, Cu, Zn, Cd, et al) have also been reported one after another. [62][63][64][65][66][67][68] In these complexes, almost all the SiF 6 2− anions in these MOFs adopted the trans-coordination configuration to connect the M-ligand chains or grids into 2D networks or 3D frameworks with 1D square channels, and the structure assembled by the connection of SiF 6 2− with interpenetrated networks has never been reported. All these results clearly show that the coordination mode of SiF 6 2− anions with the metal cations has a great effect on the structure and porosity of MOFs, and the trans-coordination mode makes it more possible to generate porous polymers.…”

Modular enhancement of circularly polarized luminescence in Pd2A2B2 heteroleptic cages

“…Ligand B is inspired by chiral cyclohexyl based tectons 42 that have been used for the generation of chiral coordination networks in the crystalline phase. [43][44][45] Both ligands A and enantiomerically pure R,R-B (from now on just B) are obtained in a one-step reaction from commercially available reagents, following literature-reported procedures. [46][47][48][49] These simple building blocks are then combined with [Pd(MeCN) 4 ](BF 4 ) 2 in acetonitrile in a 1 : 1 : 1 ratio, yielding a rather structurally complex heteroleptic cage [Pd 2 A 2 B 2 ](BF 4 ) 4 (namely Pd 2 A 2 B 2 ; Scheme 1b).…”