Distinctive Three-Step Hysteretic Sorption of Ethane with in Situ Crystallographic Visualization of the Pore Forms in a Soft Porous Crystal

A soft porous Zn(II)-MOF (1) displays distinctive three-step hysteretic breathing behavior under ethane gas pressure at ambient temperatures. In situ single-crystal X-ray diffraction analysis was carried out at 298 K using an environmental gas cell in order to elucidate the different porous forms of the breathing framework under ethane gas. The three different phases were further characterized by pressure-gradient differential scanning calorimetry and variable pressure powder X-ray diffraction analysis. © 2017 American Chemical Society.</p

Accordion and layer-sliding motion to produce anomalous thermal expansion behaviour in 2D-coordination polymers

Solvent-free (1) and solvated (2) 2D-coordination polymers have been synthesised by varying the amount of solvent during crystallisation. 1 undergoes a unique accordion motion of 2D zig-zag interwoven layers whereas 2 experiences layer-sliding within 2D layers to produce anomalous thermal expansion behaviour. © The Royal Society of Chemistry 2019.</p

Transformation from non- to double-interpenetration in robust Cd(II) doubly-pillared-layered metal–organic frameworks

Two known Cd(II) non-interpenetrated doubly-pillared metal organic frameworks are shown to undergo a change of degree of interpenetration upon loss of lattice solvent molecules to yield doubly-interpenetrated frameworks. The conversion is inferred from powder X-ray diffraction (PXRD) patterns and supported by additional evidence from single-crystal diffraction (SCD) data. © the Partner Organisations 2014.</p

Hand-twistable plastically deformable crystals of a rigid small organic molecule

4-Bromobenzonitrile was crystallised by sublimation under vacuum. The crystals show highly flexible plastic bending along two perpendicular faces when a mechanical force is applied. The rare occurrence of bending along two perpendicular faces results in twisting or helix formation. © 2018 The Royal Society of Chemistry.</p

Giant Hysteretic Sorption of CO2: In Situ Crystallographic Visualization of Guest Binding within a Breathing Framework at 298 K

A dynamic ZnII-MOF has been shown to exhibit extreme breathing behavior under gas pressure. The very narrow pore form of the activated framework opens up in the presence of carbon dioxide, thus making it a suitable material for CO2capture. Sorption of CO2at 298 K and relatively high pressure clearly shows a two-step isotherm with giant hysteresis for the second step. In-situ single-crystal diffraction analysis was carried out under CO2gas pressure at 298 K using an environmental gas cell in order to visualize the interaction between CO2and the host framework. The results are well supported by pressure-gradient differential scanning calorimetry (P-DSC) and variable-pressure powder X-ray analysis. Theoretical calculations have been carried out in order to further back up the crystallographic data. © 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim</p

A combined stretching-tilting mechanism produces negative, zero and positive linear thermal expansion in a semi-flexible Cd(II)-MOF

A novel semi-flexible Cd(II)-MOF has been synthesized and characterized by variable temperature powder and single-crystal X-ray diffraction. The material displays an unusual combination of thermal expansion (TE) i.e. negative, zero and positive, which is an extremely rare finding, especially for metal-organic frameworks as a result of a combined stretching-tilting mechanism. © The Partner Organisations 2014.</p

Hydration-dependent anomalous thermal expansion behaviour in a coordination polymer

A coordination polymer is shown to possess anomalous anisotropic thermal expansion. Guest water molecules present in the as-synthesised material can be removed upon activation without loss of crystal singularity. The fully dehydrated form shows considerably different thermal expansion behaviour as compared to the hydrate. © The Royal Society of Chemistry 2016.</p

Large volumetric thermal expansion of a novel organic cocrystal over a wide temperature range

An organic cocrystal consisting of 4-aminobenzonitrile and 4-(dimethylamino) benzonitrile (ABN·2DMABN) undergoes positive linear thermal expansion along its three principal axes over the temperature range 100-300 K. The associated volumetric thermal expansion coefficient is the largest reported to date for a cocrystal in the wide temperature range investigated. © 2018 The Royal Society of Chemistry.</p

Erratum: A combined stretching-tilting mechanism produces negative, zero and positive linear thermal expansion in a semi-flexible Cd(ii)-MOF (Chemical Communications (2014) (50) (6464-6467) DOI: 10.1039/C4CC02634A)

Correction for 'A combined stretching-tilting mechanism produces negative, zero and positive linear thermal expansion in a semi-flexible Cd(ii)-MOF' by Prem Lama et al., Chem. Commun., 2014, 50, 6464-6467. The authors regret that incorrect values were given in Table 2 of the original article. The correct version of Table 2 is given below. (Table Presented). © 2018 The Royal Society of Chemistry.</p

Reversible thermosalience of 4-aminobenzonitrile

Crystals of 4-aminobenzonitrile grown by sublimation undergo reversible thermosalient phase changes during cooling and subsequent heating. Single-crystal diffraction studies have been carried out at 20 K intervals during cooling from 300 to 100 K in order to explain the structural change that occurs. © 2018 The Royal Society of Chemistry.</p