MgO, promoted with NaNO3, is a class of CO2 sorbents that shows great promise for industrial applications in pre-and post-combustion CO2 capture processes.These sorbents offer a high theoretical gravimetric CO2 capacity of 1.09 g CO2 per g viz.MgO, MgO+CO2MgCO3 H 300K = -106.05kJ mol -1 , are naturally abundant, and environmentally friendly.However, MgO has slow carbonation kinetics, and therefore, requires promoters, which are typically alkali molten metal nitrates.There is active research to advance these materials by improving their CO2 uptake rates and cyclic stability whereby our research aims to understand the underlying structure-performance relationships [1][2][3][4].In this presentation, we will present a series of studies that employ in situ synchrotron X-ray diffraction in combination with laboratory-based methods to shed light on the mechanisms that occur at the atomic level during CO2 capture on MgO-based CO2-sorbents.We uncover the growth mechanism of MgCO3 under practically relevant conditions using a MgO(100) single crystal coated with NaNO3 as a model system.[1][2].Furthermore, we use in situ time-resolved X-ray powder diffraction to monitor the structural changes in nanocrystalline MgO promoted with NaNO3.[4].Our findings allowed us to correlate the kinetics of MgCO3 formation with the structural changes that occur in the sorbent during cyclic operation.Overall, these insights provide useful design guidelines to improve the CO2 uptake performance of MgO-based CO2 sorbents.

Phenothiazine derivatives are widely utilized in medical contexts, with their pharmacological effects contingent upon the specific side chains attached to the phenothiazine nucleus.Moreover, phenothiazine, along with its N-alkyl derivatives and metalphenothiazine complexes, exhibit significant biological activity.Despite the synthesis and characterization of numerous transition metal-phenothiazine complexes, reports detailing their crystal structures remain relatively scarce [1,2].

Two-electron multicentre bonds (2e/mc or pancake bonds) are strong intermolecular interactions which occur between planar organic radicals [1−3]. They involve the pairing of spins of contiguous radicals due to the extension of the highest occupied molecular orbital (HOMO) between both radicals; this implies a significant covalent contribution to the total interaction, which often exceeds −15 kcal mol −1 [1]. Thus, 2e/mc bonds are some of the strongest intermolecular interactions, comparable to the strong hydrogen and halogen bonds, which are also partially covalent. However, in pancake bonds, the electron pair is not localised, but distributed between two radicals, involving multiple centres [1−3]. Bulk properties of radical-based materials are defined by the degree of pancake bonding [2,3], so it is interesting not only from the fundamental aspects of nature of chemical bonding and intermolecular interactions, but also from an applicative point of view. Fine-tuning of this interaction may lead to the design of novel organic magnets and (semi)conductors.

A procedure is presented to exactly obtain the apparent average crystallite size (ACS) of powder samples using standard in-house powder diffraction experiments without any restriction originating from the Scherrer equation [1] . Additionally, the crystallite size distribution within the sample can be evaluated. To achieve this, powder diffractograms are background corrected and long-range pair-distribution functions 𝐺(𝑟) up to 300 nm are calculated from the diffraction data. The envelope function, 𝑓 1"2 , of the 𝐺(𝑟), assuming spherical crystallites [2] is approximated by a procedure determining the absolute maxima of the 𝐺(𝑟) in a certain interval (𝑟-range). Fitting of an ACS distribution envelope function to this approximation gives the ACS as well as its distribution. The method is tested on diffractograms of LaB6 standard reference materials measured with different wavelengths, geometries, and instruments to demonstrate the validity of the approach and to clarify the influence of the used wavelength. The latter one results in the general description of the maximum observable average crystallite size (MOACS), calculated according to equation 1 derived from [3]:

Meloxicam (MLX) is an anti-inflammatory drug used to treat arthritis.It is an interesting molecule prone to form diverse polymorphic forms, solvates, salts with organic and inorganic acids and basis, as well as cocrystals.We have recently reported a reliable and repeatable protocol for the crystallization of three elusive forms of MLX [1], with some of the attempts involving crystallization additives, such as pyrazole (POL) and imidazole (IMI).Here, we report a discovery and crystallization of several new binary phases of MLX with the said additives.Interestingly, only two of those were accessible through solution crystallization, while three remaining forms were obtained either through mechanochemical grinding or melting.

Gaining precise control over the structure and dynamics of matter is still an open challenge, which can give access to architectures of ever-increasing complexity and, hence, to new functional materials with desired physicochemical properties.s/p-hole interactions have garnered significant attention in contemporary research across various domains of supramolecular science and crystal engineering.Each year, a growing number of researches explore the utilization of s/p-phole interactions in materials science.In this context, our focus is on outlining some intriguing examples in s/p-phole bonded functional materials, constructed based on the foundational principles of crystal engineering.Specifically, applications in the field of porous materials, gels and structural stabilization of reactive species (Fig. 1) will be discussed [1-3].Figure 1.Cyanine dyes: synergistic action of hydrogen, halogen and chalcogen bonds allows discrete I -2 anions in crystals