From 3D interpenetrated polythreading to 3D non-interpenetrated polythreading: SBU modulation in a dual-ligand system

Synthesis, structures and magnetic properties of isoreticular polyrotaxane-type two-dimensional coordination polymers

“…This polyrotaxane entanglement has been observed in several 2D structures before. [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27] By virtue of X-ray crystallographic symmetry, bpy ligand is at the centre of this square cavity. The total potential solvent accessible area volume as calculated by PLATON in 1 is 288.3Å 3 which is 7.6% of the unit cell volume 3809.5Å 3 despite two-fold interpenetration.…”

“…[3][4][5][6][7] Among these, polyrotaxane structures can be designed from wheels formed by two bent spacer ligands with two metal ions and axles from linear spacer coligands. [8][9][10][11][12][13][14][15][16][17][18] For instance, the two-dimensional (2D) CPs containing polyrotaxane structures can be designed and constructed from bent dipyridyl ligands and linear dicarboxylates or vice versa. [19][20][21][22][23][24][25] Recently, we reported several supramolecular isomers in polyrotaxane-type CPs of Zn(II) and Co(II) using a bent ligand, 4,4 0 -sulfonyldibenzoate (sdb, Scheme 1) and a long linear spacer ligand, 1,4-bis[2-(4 0 -pyridyl)ethenyl]benzene (bpeb).…”

Two-Dimensional Metal-Organic Framework Materials: Synthesis, Structures, Properties and Applications

“…Some of these showed 2D to 3D inclined polyrotaxane forms, which will be included in the next part of this section. Many other related examples are also decorated in the literature. ,,− …”

“…An interesting MOF, [Cd 4 (sdb) 4 (bpmp) 3 ] (bpmp = bis­(4-pyridylmethyl)­piperazine), was reported by Hong and co-workers with a rare self-threading features . This can be regarded as a supramolecular isomer of [Co 4 (sdb) 4 (bpmp) 3 (H 2 O) 4 ]·2H 2 O which shows mode IIB entanglement.…”

“…Self-threaded polyrotaxane structure of [Cd 4 (sdb) 4 (bpmp) 3 ] and its schematic view. Reproduced with permission from ref . Copyright 2014 Royal Society of Chemistry.…”